The Extension Bolt Reinforcing Strap is a galvanized steel component that provides additional structural support for messenger cables on utility poles in aerial communication and power line systems. It works with cable extension bolts when a second messenger cable needs installation at the same level and side as an existing cable, supporting cable suspension clamps during parallel line installation, particularly in areas with long spans or heavier loading stresses.
The strap features a flat configuration with pre-drilled holes, typically two 11/16-inch diameters, for attachment. Available widths include 1-3/8 inches or 2 inches, with a standard thickness of 1/8 inch. The distance between the suspension clamp and upper mounting hole is often specified at 5-7/8 inches for proper alignment.
The strap is stamped from steel, often American Iron and Steel Institute (AISI) 1018 grade, and hot-dip galvanized to meet American Society for Testing and Materials (ASTM) A-153 or B695 standards, providing resistance to moisture and corrosion in outdoor environments. Weights range from approximately 10 ounces for narrower versions to 1 pound for wider variants.
Installation involves attaching the strap to the utility pole using a lag screw through the top hole, while the lower hole fits over the messenger bolt of the cable suspension clamp. This reinforces the outer end of the extension bolt, providing stability against inward and outward pulls during cable operations.
Your Trusted Supplier for Durable Extension Bolt Reinforcing Straps
RaxPower is China’s leading manufacturer specializing in pole line hardware and supporting materials for mining and construction projects. Established in 2003 with 21 years of experience, we operate from Hebei Province, China, featuring 17,000 square meters of production workshops and 5,000 square meters of warehouses.
Our team of over 170 employees, including professional technicians and engineers, utilizes advanced manufacturing processes like hot forging for superior strength and accurate sizing, ensuring that our Extension Bolt Reinforcing Strap is engineered for maximum corrosion resistance in the most demanding environments.
Code-listed and field-tested, this strap delivers reliable, long-term performance under static, wind, and seismic loads, with hot-dip galvanizing that meets ISO 1461 standards for durability.
Designed to provide added support in aerial construction and heavy-load applications, it undergoes rigorous quality control, including multi-stage testing and SGS verification, reflecting our customer-centric mission to create value through trusted products.
For faster service, give us a call (608) 618-1879.
| Parameter | Specification |
|---|---|
| Material | AISI 1018 Steel |
| Thickness | 0.125 inch |
| Width Options | 1-3/8 inch, 2 inch |
| Hole Diameters | 11/16 inch (standard), 25/32 inch (for 2 inch width) |
| Distance from Suspension Clamp to Upper Mounting Hole | 5-7/8 inch |
| Galvanization Standard | Hot-dip galvanized per ASTM A-153 or B695 |
| Weight | Approximately 10 oz (1-3/8 inch width), 1 lb (2 inch width) |
| Compatible Extension Bolt Thread Sizes | 5/8-inch-11, 3/4-inch-10 |
Frequently Asked Questions (FAQS)
What is the Extension Bolt Reinforcing Strap and what is it used for?
The Extension Bolt Reinforcing Strap is a galvanized steel component that allows placement of a second messenger at the same level and on the same side of a pole as an existing messenger. It reduces pole space requirements and installation labor while providing additional support for cable suspension clamps during inward or outward pulls, especially at locations with heavier loading stress such as long spans.
How is the Extension Bolt Reinforcing Strap installed?
Installation is straightforward: remove the nut on the existing cable suspension bolt and replace it with the open end of an extension bolt. Then attach the reinforcing strap to the pole using a lag screw at the top end, with the lower hole fitting over the messenger bolt to support the outer end of the bolt and cable. This quick process requires no additional tools.
How does the reinforcing strap provide structural support?
The strap attaches to the pole with a lag screw at the top end while the lower hole fits over the messenger bolt, creating a dual-anchor system that reinforces the cable suspension clamp and supports the messenger bolt under stress.
What sizes and configurations are available?
Extension bolts are available in two thread sizes: 5/8 in.-11 and 3/4 in.-10. Both are offered in 7 in. overall length with a 4 in. offset extension. The 5/8 in. size is also available in an 11 in. length with an 8 in. offset. Reinforcing straps come in widths of 1-3/8 in. and 2 in., designed to be used with specific extension bolts.
What materials and protective coatings are used?
The reinforcing straps are stamped from AISI 1018 steel and hot-dip galvanized per ISO 1461 for corrosion resistance and long-term durability in outdoor aerial construction environments.
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