The Cable Extension Bolt attaches to threaded ends of suspension bolts already installed in utility poles, enabling placement of a second cable at the same level and side as an existing cable run. It secures cable suspension clamps in aerial construction and works with reinforcing straps to support messenger bolts under heavier loading conditions such as long spans. The bolt is employed in side-of-pole installations for neutral conductors and secondary service wires, reducing pole space requirements and installation labor in the communications industry.
Constructed from American Iron and Steel Institute (AISI) 1018 steel or equivalent high-quality steel, the bolt features forged collars for enhanced strength rather than welded joints. Hot dip galvanizing per ASTM A153 provides corrosion resistance, while some variants include zinc-nickel plating per ASTM B695. The design incorporates rolled threads and integral washer upsets for durability in outdoor utility environments.
Common thread sizes include 5/8 inch-11 and 3/4 inch-10, with internally threaded sections ranging from four to eight inches and externally threaded sections typically three inches long. Overall lengths include 7-inch models providing 4-inch offset extensions and 11-inch models offering 8-inch extensions for easier lashing near poles. Specific variants feature shank lengths up to 14 inches with overall lengths reaching 18.5 inches.
The bolt complies with ASTM Specification F2329 and Bellcore 627-0005, with minimum tensile strength of 13,550 lbf and recommended torque of 73 ft lb. Manufacturer and tensile load markings are registered per the Fastener Insignia Act.
Cable Extension Bolt: Premier Manufacturer
Reduce your pole space requirements and installation labor demands with RaxPower’s Cable Extension Bolts. These versatile, zinc-nickel plated steel bolts allow you to place a second messenger at the same level and on the same side of a pole as an existing messenger, efficiently optimizing aerial construction. Each bolt attaches securely to the threaded end of a suspension bolt already in the pole, simplifying installations and reducing time. Available in thread sizes such as 5/8 in.-11 and 3/4 in.-10, with options for different lengths providing extensions like 4 inches or 8 inches, the design facilitates easier lashing near the pole.
RaxPower, established in 2003 and based in Hebei Province, China, leverages over 21 years of expertise in pole line hardware manufacturing to ensure these bolts deliver unmatched reliability.
Our advanced hot forging technology, a core strength, produces collars that are forged for extra strength rather than welded, enhancing durability and precise sizing. The bolts are hot-dip galvanized to meet ASTM specifications such as A153 or F2329, with mean coating thickness exceeding 85 microns per ISO 1461, ensuring corrosion resistance and long service life. Rigorous quality control, including multi-stage testing and load assessments, guarantees minimum tensile strengths of 13,550 lbf and adherence to recommended torque values, backed by our commitment to industry standards and 100% quality assurance.
| Parameter | Value |
|---|---|
| Thread Sizes | 5/8″-11, 3/4″-10 |
| Overall Length | 7 inches, 11 inches |
| Offset Extension | 4 inches, 8 inches |
| Internally Threaded Section Length | 4 to 8 inches |
| Externally Threaded Section Length | 3 inches |
| Unthreaded Section Length | 6 inches |
| Material | Steel (AISI 1018 or high-quality steel) |
| Coating | Hot dip galvanized (meets ASTM A153, ASTM B695, ASTM F2329) or zinc-nickel plated |
| Minimum Tensile Strength | 13,550 lbf |
| Recommended Torque | 73 ft lb |
| Standards Compliance | ASTM F2329, ASTM A153, ASTM B695, Bellcore 627-0005 |
| Markings | Manufacturer and tensile load designation per Fastener Insignia Act |
| Additional Features | Forged collars (for added strength, instead of welded), cone points at each end (to ease starting) |
Frequently Asked Questions (FAQS)
What is a cable extension bolt and what is it used for?
A cable extension bolt is a specialized hardware component used to place a second cable at the same level and side of a pole as an existing cable. It attaches directly to the threaded end of a suspension bolt already installed in the pole, reducing pole space requirements and installation labor demands through seamless integration.
How does the bolt connect to existing suspension hardware?
The bolt features both internally and externally threaded sections for secure connection. It attaches to the threaded end of an existing suspension bolt, with cone points at each end to ease starting and facilitate straightforward installation.
What sizes and specifications are available?
Available thread sizes include 5/8 inch-11 and 3/4 inch-10. Overall lengths are 7 inches (yielding a 4-inch offset) and 11 inches (yielding an 8-inch offset). Internally threaded sections measure 4 inches or 8 inches long, while externally threaded sections are 3 inches long.
What are the strength specifications and construction features?
The bolts have a minimum tensile strength of 13,550 lbf and feature forged collars for extra strength instead of welding. They are constructed of steel and hot-dip galvanized to meet ASTM specifications such as A153 or F2329, ensuring long-term corrosion resistance and reliability in demanding applications.
What is the recommended torque for installation?
The recommended torque value is 73 ft lb.
Are additional components needed for installation?
A reinforcing strap is often used in conjunction with the bolt for added support, particularly in locations with heavier than normal loading stress, such as long spans.
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