Hex head lag screws are large wood screws with a six-sided head and coarse, deep threads that drive into wood without a nut, providing high-load fastening for wood-to-wood or wood-to-metal connections. Manufactured in diameters from 1/4 inch to 1-1/2 inches and lengths up to 18 inches, they conform to American Society for Testing and Materials (ASTM), American Association of State Highway and Transportation Officials (AASHTO), and Society of Automotive Engineers (SAE) specifications. Features include semi-cone points for easier installation with pre-drilled pilot holes, which prevent wood splitting and ensure proper torque application.
Material options include carbon steel, stainless steel grades 304 and 316 for marine-grade corrosion resistance, and protective coatings such as zinc plating or hot-dip galvanizing. The hex head allows high torque application using standard wrenches or power tools, ensuring secure grip and reducing slippage during installation. Standard thread lengths typically equal half the screw length plus 1/2 inch or 6 inches, whichever is less.
Common applications include structural framing, deck construction, and equipment mounting where high-strength fastening is required. Load capacities increase with diameter, and pilot hole sizes should align with the root diameter for optimal performance. Stock availability typically includes diameters from 1/2 inch to 3/4 inch in plain or hot-dip galvanized finishes, with custom sizes available upon request.
Certified RaxPower Hex Head Lag Screw Wholesaler with Over 21 Years Expertise
RaxPower is China’s leading manufacturer of pole line hardware, established in 2003 in Hebei Province. With over 21 years of expertise, we are a professional certified supplier specializing in Hex Head Lag Screws, offering full technical support and tailored OEM/ODM solutions. Our commitment to customer satisfaction, continuous R&D, and strict quality control ensures that we create customized screws as the ideal solution to your specific challenges.
Utilizing advanced manufacturing processes like hot forging and automatic machines, we produce Hex Head Lag Screws with precision and superior strength. Each screw is crafted from high-quality materials, such as carbon steel or stainless steel, and features a hexagonal head design for a secure grip and reduced slippage. Zinc coatings provide excellent corrosion resistance, ensuring durability in harsh environments. These screws are versatile for various applications. Key applications include:
- Wood-to-wood connections in deck construction
- Structural support
- Industrial projects
Backed by rigorous quality assurance, including multi-stage testing and SGS certification, we guarantee reliable performance and longevity. Our dedicated team and extensive facilities enable us to meet diverse requirements with efficiency and accuracy.
Contact us today to learn more about how RaxPower’s Hex Head Lag Screws can enhance your projects and to discuss custom solutions.
| Diameter / Parameter | Threads Per Inch | Body Diameter Min (in) | Body Diameter Max (in) | Width Across Flats Min (in) | Width Across Flats Max (in) | Head Height Min (in) | Head Height Max (in) | Root Diameter (in) | Load Capacity per Inch Thread (lbs) |
|---|---|---|---|---|---|---|---|---|---|
| 1/4″ | 10 | 0.237 | 0.260 | 0.425 | 0.438 | 0.150 | 0.188 | 0.156 | 100 |
| 5/16″ | 9 | 0.298 | 0.324 | 0.484 | 0.500 | 0.195 | 0.235 | 0.188 | 200 |
| 3/8″ | 7 | 0.360 | 0.388 | 0.544 | 0.562 | 0.226 | 0.268 | 0.234 | 272 |
| 1/2″ | 6 | 0.482 | 0.515 | 0.725 | 0.750 | 0.302 | 0.364 | 0.371 | 312 |
| 5/8″ | 5 | 0.605 | 0.642 | 0.906 | 0.938 | 0.378 | 0.444 | 0.471 | 330 |
| 3/4″ | 4.5 | 0.729 | 0.768 | 1.088 | 1.125 | 0.455 | 0.524 | 0.579 | 322 |
| 7/8″ | 4 | 0.895 | 0.895 | 0.938 | 0.938 | – | – | 0.683 | – |
| 1″ | 3.5 | 1.022 | 1.022 | 1.500 | 1.500 | – | – | 0.780 | – |
| Standard Thread Length | – | – | – | – | – | – | – | – | Minimum thread length = 1/2 nominal screw length + 1/2″ or 6″, whichever is less |
| Materials | – | – | – | – | – | – | – | – | Carbon steel, Stainless steel (304, 316) |
| Finishes | – | – | – | – | – | – | – | – | Zinc plated, Hot-dip galvanized |
| Standards | – | – | – | – | – | – | – | – | ASTM, AASHTO, SAE |
Frequently Asked Questions (FAQS)
What are hex head lag screws, and are they the same as lag bolts?
Hex head lag screws are large wood screws designed for high-load wood-to-metal or wood-to-wood fastening, featuring a six-sided head and deep, sharp threads optimized for driving into wood without a nut. The terms 'lag screw' and 'lag bolt' are used interchangeably, though technically they are screws because they are installed by rotating the head rather than using a nut. RaxPower provides these fasteners in various sizes and finishes with consistent quality.
What are the common applications for hex head lag screws?
Common applications include structural framing, deck construction, equipment mounting, connecting heavy machinery to wood floors, and reinforcing laminated beams in glulam structures. They are ideal for heavy-duty connections requiring high load-bearing capacity in carpentry and industrial settings.
What materials, finishes, and sizes are available?
Materials include zinc-plated steel for strength and corrosion resistance, stainless steel (304 or 316) for outdoor or marine environments, and hot-dip galvanized finishes for enhanced durability. Diameters range from 1/4 inch to 1-1/2 inches, with lengths from 1 inch to several feet. Standard dimensions follow ASME B18.2.1, and products meet ASTM A307 Grade A standards.
What corrosion resistance and lifespan advantages do your hex head lag screws offer?
Our screws feature coatings such as hot-dip galvanizing (exceeding 85 microns thickness for articles over 6mm) and stainless steel options, providing excellent corrosion resistance in harsh, outdoor, or marine environments. This durability reduces replacement frequency, offering cost savings and extended lifespan.
What standards do your hex head lag screws meet?
Our products meet ASTM A307 Grade A for material quality and ASME B18.2.1 for dimensional specifications, with options for AASHTO or SAE compliance as required. We maintain ISO 9001 certification and conduct multi-stage testing including load and gauge testing to ensure reliability.
How do I install hex head lag screws properly?
Always pre-drill a pilot hole slightly smaller than the screw's diameter to prevent wood splitting and ensure proper torque. For larger diameters, drill a hole nearly as large as the root diameter. This practice reduces the risk of head breakage during installation.
Can you accommodate custom specifications and large volume orders?
Yes, we specialize in custom manufacturing for various sizes, materials, and finishes. Using advanced processes like hot forging, we ensure accurate sizing and strength. We handle large volume orders efficiently for construction and infrastructure projects with on-time delivery.
How do you support customers with technical expertise for specialized applications?
Our professional engineers and technicians provide comprehensive technical support for specialized applications in power lines, telecommunications, and railway systems. With years of experience and advanced R&D capabilities, we ensure our recommendations meet your specific needs and industry compliance requirements.
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