{"id":12756,"date":"2026-09-12T17:25:32","date_gmt":"2026-09-12T17:25:32","guid":{"rendered":"https:\/\/www.raxpower.com\/?p=12756"},"modified":"2026-09-20T15:07:34","modified_gmt":"2026-09-20T15:07:34","slug":"%d0%ba%d0%be%d0%bd%d1%84%d0%b8%d0%b3%d1%83%d1%80%d0%b0%d1%86%d0%b8%d0%b8-%d0%ba%d1%80%d0%b5%d0%bf%d0%b5%d0%b6%d0%bd%d1%8b%d1%85-%d1%8d%d0%bb%d0%b5%d0%bc%d0%b5%d0%bd%d1%82%d0%be%d0%b2-%d0%b2%d0%be","status":"publish","type":"post","link":"https:\/\/www.raxpower.com\/ru\/blog\/pole-line-fastener-configurations\/","title":{"rendered":"\u041e\u0431\u0437\u043e\u0440 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0451\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0439 \u043a\u0440\u0435\u043f\u0435\u0436\u0430 \u0432\u043e\u0437\u0434\u0443\u0448\u043d\u044b\u0445 \u043b\u0438\u043d\u0438\u0439"},"content":{"rendered":"<p style=\"line-height: 1.8; margin-bottom: 28px;\">Ask three suppliers for a quote on \"pole line fasteners\" and you will usually get three different baskets of hardware. One prices square head machine <a href=\"https:\/\/www.raxpower.com\/blog\/pole-line-bolts-guide\">bolts<\/a>, another adds double arming bolts, a third throws in lag screws and curved washers. The order desk at RaxPower sees this every week. Inquiries arrive listing a pole type and an attachment, but rarely the fastener configuration itself. So the quote has to start by mapping each attachment point to a hardware family.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">That mapping is exactly what this guide covers. Each common configuration is described by three things: its shape features, the parts that complete the joint, and the spot on the pole or crossarm where it does its work. The same three-part description works in reverse when an as-built pole has to be turned back into a purchase order after a storm or an upgrade. Read it as a parts map for utility structures, not a materials comparison. Use it to check a bill of materials line by line before it turns into a purchase order.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">What Counts as a Pole Line Fastener<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">On an overhead line, the fasteners are the threaded components that clamp hardware to the structure, as opposed to the clamps and braces that grip the conductor. A pole line fastener family is defined by four features: head style, shank and thread, point, and the nut or washer set that closes the joint. Change any one of those and you get a different configuration with a different job.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The families covered here account for most of the threaded hardware on a wood or concrete distribution structure:<\/p>\n<ul>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Square head machine bolts, the general-purpose through-bolts for crossarms and equipment.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Double arming bolts, fully threaded rods that tie two crossarms into one stiff assembly.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Hex head lag screws, which thread directly into wood with no nut.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">U-bolts, eye bolts, clevis bolts, and double-end stud bolts for specialized attachment points.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Square nuts, flat washers, and curved washers that complete nearly every joint above.<\/li>\n<\/ul>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">That distinction matters because the two families fail differently: a clamp works on the conductor, while a fastener works on the structure, and its failure mode is slow, visible loosening. So a configuration map pays off at inspection time as much as at ordering time. Most families share the same base construction: hot-forged steel, hot-dip galvanized for outdoor service, with malleable iron or aluminum appearing where a specific fitting calls for it. The differences that matter for ordering are the shape features, not the metallurgy, so this guide stays on geometry and placement. The sections below walk each family in the same order a crew meets them climbing a pole.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Square Head Machine Bolts: The Crossarm Workhorse<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The square head machine bolt is the configuration most people picture when they think of pole line fasteners. It passes clear through the crossarm or through arm and pole, and a square nut drawn up on the far side clamps the assembly. The square head resists round-off when a lineman's spud wrench swings in a tight workspace, and it stays put in the bolt hole while both hands are busy.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Most utility-grade machine bolts in this family are made to ASTM A307, and suppliers ship them with matching square nuts. Common diameters run from 3\/8 inch up to 7\/8 inch, with lengths chosen so the shank passes fully through the assembly with a few threads to spare for the nut. On the structure they fasten crossarms to poles, <a href=\"https:\/\/www.raxpower.com\/blog\/light-pole-bracket-function-installation\">bracket<\/a> channels to arms, and equipment mounting plates wherever a removable, high-strength connection is needed. The <a href=\"https:\/\/www.raxpower.com\/pole-line-fastener\/\" title=\"Pole Line Fastener\">pole line fastener<\/a> range groups every family below under one catalog heading. Removability is the quiet advantage worth noting. Unlike a lag screw, a machine bolt can be backed out and replaced without damaging the surrounding wood, which is why utilities standardize on it for storm-restoration hardware.<\/p>\n<figure>\n<img decoding=\"async\" src=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/Square-Head-Machine-Bolt-Drawing.jpg\" alt=\"Square head machine bolt dimension drawing showing head height, thread length and square width\" width=\"1500\" height=\"1062\" loading=\"lazy\" class=\"wp-image-8661\" style=\"width: 100%; height: auto; border-radius: 8px; object-fit: cover;\" srcset=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/Square-Head-Machine-Bolt-Drawing.jpg 1500w, https:\/\/www.raxpower.com\/wp-content\/uploads\/Square-Head-Machine-Bolt-Drawing-300x212.jpg 300w, https:\/\/www.raxpower.com\/wp-content\/uploads\/Square-Head-Machine-Bolt-Drawing-1024x725.jpg 1024w, https:\/\/www.raxpower.com\/wp-content\/uploads\/Square-Head-Machine-Bolt-Drawing-768x544.jpg 768w\" sizes=\"auto, (max-width: 1500px) 100vw, 1500px\" \/><figcaption style=\"font-size: 14px; font-style: italic; color: #666; margin-top: 10px; text-align: center; line-height: 1.5;\">Square head machine bolt: head height, thread length, and square width<\/figcaption><\/figure>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Two specification habits keep this configuration reliable. First, order the length from the sum of the parts being clamped, not from the pole alone, so the nut seats on full threads. Second, keep the square head on the side a wrench can actually reach; a bolt installed head-inaccessible gets torqued by guesswork, and guesswork loosens over time.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Hole preparation belongs in the same conversation. Wood crossarms take a drilled hole matched to the bolt diameter, and the cone point on longer bolts carries it through without shaving the thread. Crews who ream the hole oversize to speed assembly defeat the geometry, because the shank is what resists shear in a crossarm connection. A loose shank in an oversize hole lets the arm work on every wind pass, and the joint starts talking long before it fails. On replacement jobs, the drilled diameter also decides whether the old hole can be reused or whether the bolt pattern has to move.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Double Arming Bolts That Space a Crossarm Pair<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">When a span, an angle, or a dead-end demands more strength than one crossarm gives, the fix is a second arm. Crews bolt it to the opposite side of the pole and tie the two together. The fastener built for that job is the double arming bolt, usually shortened to DA bolt in catalogs and invoices.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The configuration is distinctive: a long rod with thread running the full length, finished with four square nuts. Two nuts clamp the near crossarm, two clamp the far one, and the threaded length between them locks the arm spacing so the pair works as one beam. A 5\/8-inch DA bolt carries a minimum tensile strength of 13,550 pounds, which is why the configuration anchors the heavy spots on a line.<\/p>\n<blockquote style=\"border-left: 4px solid #2e72ab; margin: 0 0 28px 0; padding: 10px 20px; background-color: #f6f8fa; font-style: italic;\"><p>\"Double Arming Bolts are fully threaded and assembled with four square nuts\" and are used \"in double crossarm construction to secure and lock in the spacing between the crossarms.\" \u2014 MacLean Power Systems product specification<\/p><\/blockquote>\n<figure>\n<img decoding=\"async\" src=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-urban-grid-guide-stock-crossarm.webp\" alt=\"Galvanized steel crossarm through-bolted between two wood utility poles with suspension insulators\" width=\"1200\" height=\"800\" loading=\"lazy\" class=\"wp-image-12219\" style=\"width: 100%; height: auto; border-radius: 8px; object-fit: cover;\" srcset=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-urban-grid-guide-stock-crossarm.webp 1200w, https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-urban-grid-guide-stock-crossarm-300x200.webp 300w, https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-urban-grid-guide-stock-crossarm-1024x683.webp 1024w, https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-urban-grid-guide-stock-crossarm-768x512.webp 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption style=\"font-size: 14px; font-style: italic; color: #666; margin-top: 10px; text-align: center; line-height: 1.5;\">Through-bolted crossarm assembly on a paired wood pole structure<\/figcaption><\/figure>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">One more trick belongs to this family: the outboard ends of a DA bolt can accept eyenuts, turning the same bolt into a dead-end attachment point. That is why some bills of materials list one double arming bolt where a crew will later hang a guy or a dead-end grip. The fastener is doing two jobs, so quote it once but inspect it twice. Inspection should confirm that all four nuts are present and that the outer pair still shows full thread engagement. A DA bolt missing one nut no longer spaces the arms symmetrically.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Lag Screws for Light Wood Attachments<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Not every attachment justifies drilling clear through the pole. For light brackets, spool racks, ground wire moulds, and crossarm braces, the configuration of choice is the hex head lag screw. These are large wood screws: a six-sided head, a coarse deep thread, and a point that cuts its own path into the pole. There is no nut on the far side, because there is no far side.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Because the holding power comes from wood fibers gripping the thread, installation discipline matters more than with a through-bolt. Lag screws in this family come with semi-cone points meant to start in pre-drilled pilot holes. Skip the pilot hole and the screw splits the pole face or shears off halfway in. The trade-off is real: a lag screw installs faster than a through-bolt, but its load path ends in the wood surface layer. It belongs on light-duty attachments only.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The family also carries small accessories of its own. Sealing washers with a neoprene backing keep water out of the entry hole, and longer embedment lengths compensate for softened wood on replacement poles. When an inquiry says \"lag everything,\" the useful counter-question is the expected service life of the attachment. The screw itself rarely fails before the wood around it does, and sizing for the wood is what actually sizes the fastener.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Withdrawal is the other half of the lag screw's personality. A lagged attachment can be backed out and repositioned with a wrench, which field crews like, but every removal chews the fibers that provide the grip. Utilities split on where to draw that line, and the split shows up in ordering habits. Some standards let lag screws carry alley arm braces and secondary racks; others require through-bolted \"hard head\" connections for anything structural. When a purchase order names lag screws for a brace job, confirm the utility's standard before quoting, because the same drawing can price out either way.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">U-Bolts That Wrap Round Pole Surfaces<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Round things need a fastener shaped like the job. A U-bolt is a rod bent into a U with threads on both legs. The product specification says U-bolts \"attach components to poles, beams, or walls\", and that they stabilize \"piping and conduit systems\". The two legs reach around a pipe, conduit run, or the pole itself. A plate or bracket spans the legs, and a nut on each leg draws the loop tight.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Three dimensions define the configuration, and all three appear on a proper purchase order: rod diameter, the inside width between the legs, and the length of each threaded leg. Miss the inside width and the U-bolt either bottoms out on an oversize pipe or rattles loose on an undersize one. On structures, this family carries conduit risers, bonding conductors, and small equipment straps anywhere a bracket must hug a curved surface. Thread patterns vary: some designs thread only the leg tips, others most of the leg. Buyers should confirm thread length against the plate thickness they plan to use.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">A related bent-rod configuration, the pole key anchor and similar wrapped fittings, uses the same logic: the bend carries load, the threads only clamp. Field crews tend to judge U-bolts by how quickly the nuts run on, but the honest test is whether the loop still matches the pipe two winters later. The closing plate deserves equal attention in the quote, since a plate too narrow lets the legs spread under load and the clamp relaxes. Installers should never re-bend a U-bolt to fit a different pipe size, because the bend is heat-treated geometry, not a field-adjustable feature.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Nuts on a U-bolt deserve the same scrutiny as the bend. Because both legs share the load, a loose nut on one leg tilts the closing plate and unloads the other. A torque check on each leg, rather than a single feel-based tighten, is what keeps the clamp symmetrical through the seasons. The same habit applies to any paired fastener on the structure, which is why acceptance checklists read nut by nut instead of joint by joint.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Eye Bolts at the Guy and Insulator Point<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Wherever something hangs or pulls at an angle, the fastener needs a hole instead of a head. <a href=\"https:\/\/www.raxpower.com\/blog\/pigtail-eye-bolt-load-capacity-guide\">Eye bolts<\/a> answer that call. The configuration is a shank with a forged ring at one end and threads at the other. The ring accepts a guy strand thimble, an insulator pin, or a clevis tongue. The threaded shank passes through the crossarm or pole to a nut on the far side.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Shape matters at this attachment point. Shoulder eye bolts add a forged collar below the eye. That collar \"enables angular pulls, unlike regular eye bolts limited to vertical loading.\" It is what lets the eye take load at an angle. In line work, shoulder patterns attach suspension insulators, clevises, and hardware to poles and crossarms. Thimble-eye versions add a protective groove in the ring where guy strand bears on it.<\/p>\n<figure>\n<img decoding=\"async\" src=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/Oval-Eye-Bolt.jpg\" alt=\"Hot-dip galvanized oval eye bolt with threaded shank and square nut\" width=\"1120\" height=\"680\" loading=\"lazy\" class=\"wp-image-8655\" style=\"width: 100%; height: auto; border-radius: 8px; object-fit: cover;\" srcset=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/Oval-Eye-Bolt.jpg 1120w, https:\/\/www.raxpower.com\/wp-content\/uploads\/Oval-Eye-Bolt-300x182.jpg 300w, https:\/\/www.raxpower.com\/wp-content\/uploads\/Oval-Eye-Bolt-1024x622.jpg 1024w, https:\/\/www.raxpower.com\/wp-content\/uploads\/Oval-Eye-Bolt-768x466.jpg 768w\" sizes=\"auto, (max-width: 1120px) 100vw, 1120px\" \/><figcaption style=\"font-size: 14px; font-style: italic; color: #666; margin-top: 10px; text-align: center; line-height: 1.5;\">Galvanized oval eye bolt with threaded shank and nut<\/figcaption><\/figure>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The ordering detail that separates buyers who have been burned from buyers who will be is eye orientation. An inline eye pulls along the shank axis, while an eye for cross-mounting sits at right angles to it. Quote the wrong orientation and the crew either rotates the nut a half turn out of position or re-drills the crossarm on pole day. Wear is the quieter issue at guy points. Strand moving inside an unprotected eye saws at the galvanizing first and the steel second, which is exactly the duty the thimble-eye groove exists to absorb.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Clevis Bolts and Double-End Stud Connections<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Two smaller families finish the bolt map. The clevis bolt is a short bolt with a rounded, slotted head, sized to pass through the eyes of clevises and link fittings and pivot inside them. The product page is blunt about duty: it is \"designed for applications where large shearing stress occurs and [is] not intended for tension use\". That warning is precise, because this bolt behaves like a machine hinge pin in a linkage, and pins carry load across their diameter rather than along their length. Treat a clevis bolt as a tension member and it will bend straight out of the connection.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Studs fit wherever a <a href=\"https:\/\/www.raxpower.com\/blog\/bolt-head-types-guide\">bolt head<\/a> would snag tools, or where the joint is too deep for a through-bolt to reach both faces. Studs also simplify alignment, because each end threads into its fitting separately before the nuts run down. The trade is that a stud has no head to hold during torquing, so the far end needs a jam nut or a threaded recess. Both details belong on the drawing, not in a field improvisation.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Both configurations reward one habit: checking thread engagement on every nut at acceptance. A stud or pin joint showing less than a full nut height of engaged thread is one thermal cycle from walking loose. Fixing it costs nothing while the crew is still on the pole.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Square Nuts and Washers That Close the Joint<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">No bolt configuration works alone. On pole line fasteners, the closing hardware is deliberately old-fashioned: square nuts. They seat flat against square washers, resist turning in the wrench saddle, and match the square heads already on the bolt. Pair a square nut with a hex washer and the bearing surface shrinks to the corners, which is how point-loading on wood starts.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Washers are the quiet half of every configuration. Flat square washers spread clamping load on the flat faces of crossarms and brackets. Curved washers solve the problem round poles create. The product specification is direct: \"the curved surface matches pole contours while distributing load evenly\", and that prevents \"deformation of wood or composite materials under heavy loads\". In vibration, the square shape also \"offers anti-rotation properties\".<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The practical rule for procurement is to quote washers and nuts as part of the fastener line, not as loose extras. A machine bolt order without its curved washers gets installed anyway, and the joint then spends twenty years slowly crushing a groove into the pole. Missing square nuts get replaced with whatever hex nut is in the truck box, and the bearing problem compounds. Hardware completeness is a configuration property, not a convenience.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Square hardware also ages differently from hex hardware in the yard. A square nut stacked loose in a bin scars its corners, and scarred corners stop seating flush long before the threads show wear. Bags kept sealed until pole day preserve the flat bearing faces the whole configuration depends on.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Point Styles and Thread Conventions<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The last inch of a pole line fastener changes how it installs. Two conventions dominate:<\/p>\n<ul>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Cone or semi-cone points on machine bolts and DA bolts. The tapered point guides the bolt through pre-drilled holes without shaving the threads, so the nut runs on cleanly at the far side. MacLean's machine bolt specification applies this to \"bolts 1\/2-inch and larger in diameter and 7-inch and longer in length.\"<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Gimlet-style semi-cone points on lag screws, which cut their own thread into the wood. These demand a pilot hole sized to the shank, or the screw drives hard and the last threads strip.<\/li>\n<\/ul>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Thread conventions follow the same either\/or logic. Through-bolts carry thread only where the nut needs it, with the remaining shank smooth so it fills the hole without chewing it. Double arming bolts run thread end to end because both nuts travel and the spacing between arms is set by threading, not by shank length. Bolt length conventions also ignore the point. MacLean notes for DA bolts that \"length dimensions do not include the points\", so a quoted 30-inch bolt offers a shorter grip than its stamp suggests.<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Matching Each Configuration to Its Job<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The <a href=\"https:\/\/www.raxpower.com\/blog\/pole-line-fasteners-types-guide\">fastener families<\/a> above sort cleanly by attachment point, and that sorting is the core of pole line fastener configurations. The table below is the one-glance version, the same mapping the order desk applies when an inquiry names a pole part but not the hardware.<\/p>\n<table style=\"display: block; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; border-collapse: collapse; margin-bottom: 28px; border: 1px solid #e0e0e0; font-family: inherit;\">\n<thead>\n<tr>\n<th style=\"padding: 12px; border: 1px solid #e0e0e0; text-align: left; background: #f6f8fa;\">Configuration<\/th>\n<th style=\"padding: 12px; border: 1px solid #e0e0e0; text-align: left; background: #f6f8fa;\">Signature feature<\/th>\n<th style=\"padding: 12px; border: 1px solid #e0e0e0; text-align: left; background: #f6f8fa;\">Typical position on the structure<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Square head machine bolt<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Square head, partial thread, cone point, square nut<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Crossarm to pole, brackets and equipment to arm<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Double arming bolt<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Full-length thread, four square nuts<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Spacing and locking a double crossarm; eyenut dead-ends<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Hex head lag screw<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Wood thread, semi-cone point, no nut<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Light brackets, racks, brace ends on the pole face<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">U-bolt<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Bent rod, threads on both legs<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Conduit risers, pipe straps, round-surface mounts<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Eye bolt (shoulder, thimble, oval)<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Forged ring; collar for angular pulls<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Guy attachments, insulator and clevis hanging points<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Clevis bolt<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Round slotted head, shear-rated pin duty<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Through clevis and link fitting eyes<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Double-end stud bolt<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Threads both ends, plain center shank<\/td>\n<td style=\"padding: 12px; border: 1px solid #e0e0e0;\">Stacked fittings where a head cannot pass through<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"cta-box\" style=\"display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; background-color: #2e72ab; border-radius: 8px; padding: 25px 30px; min-height: 210px; margin-bottom: 28px;\">\n<div style=\"flex: 1 1 320px; min-width: 260px;\">\n<p style=\"color: #ffffff; font-size: 18px; font-weight: bold; margin: 0 0 12px 0; line-height: 1.6;\">Need a quote that names every nut and washer?<\/p>\n<p style=\"color: #ffffff; margin: 0 0 18px 0; line-height: 1.8;\">Send your attachment list and the RaxPower team will map each point to the right configuration, complete with the square nuts, flat washers, and curved washers that close the joint.<\/p>\n<p><a href=\"https:\/\/www.raxpower.com\/pole-line-fastener\/\" style=\"display: inline-block; background-color: #ffffff; color: #2e72ab; padding: 12px 28px; border-radius: 4px; text-decoration: none; font-weight: bold;\">View the Pole Line Fastener Range<\/a>\n<\/div>\n<div style=\"flex: 0 1 320px; min-width: 220px;\">\n<img decoding=\"async\" src=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/Pole-Line-Fastener.jpg\" alt=\"RaxPower pole line fastener family: galvanized eye bolts, U-bolts, machine bolts, nuts and washers\" width=\"1120\" height=\"680\" loading=\"lazy\" style=\"width: 100%; height: 210px; object-fit: cover; border-radius: 8px;\">\n<\/div>\n<\/div>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">How One Pole Carries Three Fastener Families<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">When the crew sets a new 40-foot distribution pole, the fastener map gets exercised in one climb. The crossarm goes up first: two square head machine bolts through the arm and pole, curved washers against the round wood faces, square nuts run down with a spud wrench. By the time the arm is level, the pole already carries the first family.<\/p>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">The second stop is the bracing. Flat braces run from the arm's underside to the pole, and utility standards split on how they attach. This crew's standard calls for a lag screw at the brace end and a through-bolt at the arm, so both families appear within four feet of each other. The third stop is the guy. It takes a thimble-eye bolt at the pole and a clevis bolt through the anchor rod's eye, the same pairing covered in this <a href=\"https:\/\/www.raxpower.com\/blog\/dead-end-assembly-selection-installation\/\" title=\"How to Select and Install a Dead End Assembly\">dead end assembly selection and installation guide<\/a>. A nut check on every thread comes before the climber descends.<\/p>\n<figure>\n<img decoding=\"async\" src=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-brace-stock-working-position.webp\" alt=\"Lineman in work position on a wood distribution pole during hardware installation\" width=\"1200\" height=\"799\" loading=\"lazy\" class=\"wp-image-12230\" style=\"width: 100%; height: auto; border-radius: 8px; object-fit: cover;\" srcset=\"https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-brace-stock-working-position.webp 1200w, https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-brace-stock-working-position-300x200.webp 300w, https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-brace-stock-working-position-1024x682.webp 1024w, https:\/\/www.raxpower.com\/wp-content\/uploads\/alley-arm-brace-stock-working-position-768x511.webp 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption style=\"font-size: 14px; font-style: italic; color: #666; margin-top: 10px; text-align: center; line-height: 1.5;\">Climber fastening hardware at the working position on a wood pole<\/figcaption><\/figure>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">In our experience, the acceptance walk tells you everything. Every fastener family sits where the drawing put it, every nut shows full thread engagement, and no washer is missing from a wood contact face. The way you keep a pole quiet for twenty years is specifying by configuration rather than by \"bolts, assorted.\"<\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Configuration Mistakes That Show Up Later<\/h2>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">Most fastener problems on an overhead line trace back to a specification decision, not to installation force. The recurring ones:<\/p>\n<ul>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Hex nuts paired with square-head bolts on wood, shrinking bearing area and starting point-load crushing.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Lag screws specified where a through-bolt belongs, leaving braces and racks held only by surface fibers.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Machine bolt lengths quoted with the cone point included, so the nut runs out of thread before it seats.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">U-bolt inside widths that do not match the pipe they wrap, creating either a bound or a rattling clamp.<\/li>\n<li style=\"margin-bottom: 10px; line-height: 1.6;\">Straight eye bolts installed where pulls are angular, a duty that calls for the shoulder collar pattern instead.<\/li>\n<\/ul>\n<p style=\"line-height: 1.8; margin-bottom: 28px;\">None of these fail on installation day. They surface later as cracked crossarms, drifting braces, and guys that slacken season after season, and that is exactly the cost profile a configuration check at quotation time removes. A quote that names each family, its closing hardware, and its attachment point takes one revision instead of four. <a href=\"https:\/\/www.raxpower.com\/blog\/crossarm-brace-transmission-selection\/\" title=\"Crossarm Brace Selection for Transmission Lines\">The crossarm brace selection logic<\/a> used elsewhere on this site slots straight into the same check. That is the practical case for treating these configurations as a map rather than a parts list, and the habit keeps hardware quiet for the life of the line.<\/p>\n<p><!-- raxgate:C1 --><\/p>\n<h2 style=\"margin-top: 50px; margin-bottom: 30px; font-size: 28px; font-weight: bold;\">Frequently Asked Questions<\/h2>\n<div class=\"faq-card\" style=\"margin-bottom: 20px; padding: 25px; background-color: #f9f9f9; border-left: 4px solid #2e72ab; border-radius: 4px;\">\n<p style=\"line-height: 1.8; margin-bottom: 12px;\"><strong>What is the most common pole line fastener configuration?<\/strong><\/p>\n<p style=\"line-height: 1.8; margin-bottom: 0;\">The square head machine bolt with a square nut. It is the general-purpose through-bolt for crossarms, brackets, and equipment on wood and concrete structures.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"margin-bottom: 20px; padding: 25px; background-color: #f9f9f9; border-left: 4px solid #2e72ab; border-radius: 4px;\">\n<p style=\"line-height: 1.8; margin-bottom: 12px;\"><strong>Why does a double arming bolt have four nuts?<\/strong><\/p>\n<p style=\"line-height: 1.8; margin-bottom: 0;\">Two nuts clamp each of the paired crossarms, and the fully threaded rod locks the spacing between them so both arms work as a single beam.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"margin-bottom: 20px; padding: 25px; background-color: #f9f9f9; border-left: 4px solid #2e72ab; border-radius: 4px;\">\n<p style=\"line-height: 1.8; margin-bottom: 12px;\"><strong>When should a lag screw be used instead of a machine bolt?<\/strong><\/p>\n<p style=\"line-height: 1.8; margin-bottom: 0;\">Only for light attachments such as small brackets and racks. Lag screws thread into the pole face without a nut, so their load path is limited to surface wood fibers.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"margin-bottom: 20px; padding: 25px; background-color: #f9f9f9; border-left: 4px solid #2e72ab; border-radius: 4px;\">\n<p style=\"line-height: 1.8; margin-bottom: 12px;\"><strong>What is the difference between a shoulder eye bolt and a plain eye bolt?<\/strong><\/p>\n<p style=\"line-height: 1.8; margin-bottom: 0;\">A shoulder eye bolt has a forged collar that supports angular pulls. A plain eye bolt is intended for in-line loading and should not carry loads at an angle.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"margin-bottom: 20px; padding: 25px; background-color: #f9f9f9; border-left: 4px solid #2e72ab; border-radius: 4px;\">\n<p style=\"line-height: 1.8; margin-bottom: 12px;\"><strong>Why are curved washers used on utility poles?<\/strong><\/p>\n<p style=\"line-height: 1.8; margin-bottom: 0;\">Their concave curve seats against the round pole, spreads the clamping load evenly, and protects the wood fibers from crushing under the nut.<\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the most common pole line fastener configuration?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The square head machine bolt with a square nut. It is the general-purpose through-bolt for crossarms, brackets, and equipment on wood and concrete structures.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does a double arming bolt have four nuts?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Two nuts clamp each of the paired crossarms, and the fully threaded rod locks the spacing between them so both arms work as a single beam.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"When should a lag screw be used instead of a machine bolt?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Only for light attachments such as small brackets and racks. Lag screws thread into the pole face without a nut, so their load path is limited to surface wood fibers.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a shoulder eye bolt and a plain eye bolt?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A shoulder eye bolt has a forged collar that supports angular pulls. A plain eye bolt is intended for in-line loading and should not carry loads at an angle.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why are curved washers used on utility poles?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Their concave curve seats against the round pole, spreads the clamping load evenly, and protects the wood fibers from crushing under the nut.\"}\n    }\n  ]\n}\n<\/script><\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;12756&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;4&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 \u0433\u043e\u043b\u043e\u0441\u043e\u0432)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Common Configurations of Pole Line Fasteners Explained&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Rate this post<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u0417\u0430\u043f\u0440\u043e\u0441\u0438\u0442\u0435 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u043e\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435 \u0443 \u0442\u0440\u0451\u0445 \u043f\u043e\u0441\u0442\u0430\u0432\u0449\u0438\u043a\u043e\u0432 \u043d\u0430 \u201c\u043a\u0440\u0435\u043f\u0435\u0436 \u0434\u043b\u044f \u0432\u043e\u0437\u0434\u0443\u0448\u043d\u044b\u0445 \u043b\u0438\u043d\u0438\u0439\u201d, \u0438 \u0432\u044b, \u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u043e, \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u0435 \u0442\u0440\u0438 \u0440\u0430\u0437\u043d\u044b\u0445 \u043a\u043e\u043c\u043f\u043b\u0435\u043a\u0442\u0430 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f. \u0423 \u043e\u0434\u043d\u043e\u0433\u043e \u0432 \u0446\u0435\u043d\u0435 \u0431\u043e\u043b\u0442\u044b \u0441 \u043a\u0432\u0430\u0434\u0440\u0430\u0442\u043d\u043e\u0439 \u0448\u0435\u0439\u043a\u043e\u0439, \u0443 \u0432\u0442\u043e\u0440\u043e\u0433\u043e \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u044b \u0434\u0432\u043e\u0439\u043d\u044b\u0435 \u043c\u043e\u043d\u0442\u0430\u0436\u043d\u044b\u0435 \u0431\u043e\u043b\u0442\u044b, \u0430 \u0442\u0440\u0435\u0442\u0438\u0439 \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u0441\u0442\u044f\u0436\u043d\u044b\u0435 \u0448\u0443\u0440\u0443\u043f\u044b (lag screws) \u0438 \u0438\u0437\u043e\u0433\u043d\u0443\u0442\u044b\u0435 \u0448\u0430\u0439\u0431\u044b. \u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b \u043f\u0440\u0438\u0435\u043c\u043a\u0438 \u0437\u0430\u044f\u0432\u043e\u043a RaxPower \u0441\u0442\u0430\u043b\u043a\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0441 \u044d\u0442\u0438\u043c \u043a\u0430\u0436\u0434\u0443\u044e \u043d\u0435\u0434\u0435\u043b\u044e. \u0417\u0430\u043f\u0440\u043e\u0441\u044b \u043f\u043e\u0441\u0442\u0443\u043f\u0430\u044e\u0442 \u0441 \u0443\u043a\u0430\u0437\u0430\u043d\u0438\u0435\u043c \u0442\u0438\u043f\u0430 \u043e\u043f\u043e\u0440\u044b\u2026<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","rank_math_title":"Pole Line Fasteners Types: Bolts, Nuts, Washers","rank_math_description":"A parts-map of pole line fastener configurations: square head machine bolts, double arming bolts, lag screws, U-bolts, eye bolts, nuts and washers, and where each belongs on the structure.","rank_math_focus_keyword":"","rank_math_robots":"","rank_math_canonical_url":"","rank_math_facebook_title":"","rank_math_facebook_description":"","rank_math_twitter_title":"","rank_math_twitter_description":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_focuskw":"","_yoast_wpseo_canonical":"","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_aioseo_title":"","_aioseo_description":"","_aioseo_keywords":"","_aioseo_robots_default":"","_aioseo_robots_noindex":"","_aioseo_og_title":"","_aioseo_og_description":"","_aioseo_twitter_title":"","_aioseo_twitter_description":"","aiosp_title":"","aiosp_description":"","aiosp_keywords":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_analysis_target_kw":"","_seopress_robots_canonical":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_genesis_title":"","_genesis_description":"","_genesis_canonical":"","_genesis_noindex":"","_genesis_nofollow":"","slim_seo":""},"categories":[98],"tags":[],"class_list":["post-12756","post","type-post","status-publish","format-standard","hentry","category-product-knowledge","category-98","description-off"],"_links":{"self":[{"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/posts\/12756","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/comments?post=12756"}],"version-history":[{"count":5,"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/posts\/12756\/revisions"}],"predecessor-version":[{"id":13009,"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/posts\/12756\/revisions\/13009"}],"wp:attachment":[{"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/media?parent=12756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/categories?post=12756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.raxpower.com\/ru\/wp-json\/wp\/v2\/tags?post=12756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}