The Double Arming Bolt, also called a double threaded bolt or double ended bolt, secures two crossarms on utility poles in power distribution and telecommunication systems. This fastener features threads on both ends, allowing it to connect components from opposite directions while withstanding high loads and harsh environmental conditions.
Primary applications include electrical power lines where crossarms attach to poles, telecommunication infrastructure requiring secure hardware mounting, and industrial machinery needing stable connections. The bolt’s threaded design accommodates standard nuts and washers, with common diameters of 5/8 inch, 1/2 inch, and 3/4 inch, and lengths ranging from 10 to 22 inches or more. Ultimate tensile strengths reach up to 14,100 pounds.
Construction typically uses steel with hot-dip galvanizing per ASTM A153 standards, providing corrosion resistance for outdoor exposure. Threads are produced through a rolling swaging process, which enhances strength compared to machined alternatives. Chamfered or cone-pointed ends facilitate installation and removal without damaging threads. Standard configurations include four square nuts as accessories.
The durable design minimizes maintenance requirements while delivering reliable performance in demanding pole-line hardware applications, making it a cost-effective solution for projects requiring dependable fastening under stress.
Premier Double Arming Bolt Manufacturer
Enhance the durability and reliability of your electrical transmission systems with our high-quality Double-Arming Bolts. RaxPower is a client-centric manufacturer of electrical distribution hardware and anchoring solutions for the power utility and renewable sectors, established in 2003 with 21 years of experience and based in Hebei Province, China. We supply an extensive line of products to utilities, wholesalers, and contractors worldwide.
Our Double-Arming Bolts are engineered with full-length threading and cone points, manufactured using RaxPower’s advanced hot forging technology for greater strength and accurate sizing. Featuring rolled threads that are stronger than machined threads, these bolts offer an ultimate tensile strength of 14,100 lbs and are hot-dip galvanized with a mean coating thickness over 85 microns per ISO 1461 for superior corrosion resistance. With strict quality control, including raw material selection and multi-stage testing, we ensure every product meets rigorous industry standards.
Trust RaxPower’s expertise in precision engineering and robust manufacturing for bolts that withstand heavy loads and extreme conditions. Contact us today to discuss your Double Arming Bolt needs.
| Diameter (inch) | Length (inch) | Tensile Strength (lbs) | Material | Coating | Coating Standard | Thread Type | End Type | Nuts Included |
|---|---|---|---|---|---|---|---|---|
| 1/2″ | 10″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 1/2″ | 12″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 1/2″ | 14″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 1/2″ | 16″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 1/2″ | 18″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 1/2″ | 20″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 1/2″ | 22″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 5/8″ | 10″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 5/8″ | 12″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 5/8″ | 14″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 5/8″ | 16″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 5/8″ | 18″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 5/8″ | 20″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 5/8″ | 22″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 3/4″ | 10″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 3/4″ | 12″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 3/4″ | 14″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 3/4″ | 16″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 3/4″ | 18″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 3/4″ | 20″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
| 3/4″ | 22″ | 14,100 | Steel | Hot-Dip Galvanized | ASTM A153 | Rolled (swaging process) | Chamfered or Cone-Pointed | 4 Square Nuts |
Frequently Asked Questions (FAQS)
A Double Arming Bolt (also called a double threaded bolt or double ended bolt) is a versatile fastener that secures and connects two crossarms on utility poles. It is used in electrical power distribution systems, telecommunication networks, industrial machinery, construction projects, and pole-line hardware across various industries to ensure stability and structural integrity.
These bolts feature superior strength to withstand high loads, with ultimate tensile strength ratings such as 14,100 lbs for certain models. They have rolled threads for enhanced durability, cone points for easy driving and removal, and standardized threading for compatibility. Common sizes include 5/8, 1/2, and 3/4 inch diameters with various lengths (such as 22 inches), available with full-length threading and supplied with square or hex nuts.
Double Arming Bolts are manufactured from steel and coated with hot-dip galvanized finish meeting ASTM A153 standards. This coating protects against rust and environmental factors, ensuring reliable performance under extreme weather conditions and harsh environments while minimizing maintenance needs.
To install, assemble necessary tools (including a drill if needed), disassemble nuts and washers from the bolt, insert the chamfered ends into the pole hole, push through to the other end, add any pole-line hardware, then secure with washers and nuts on both ends to ensure a tight and stable connection.
Yes, we provide customizable lengths and various sizes to meet specific project requirements. Our client-centric approach supports bulk orders for large-scale projects, including those handled by EPC contractors, with exceptional service to ensure timely completion.
We offer competitive wholesale pricing and a diverse product catalog with double arming bolts in various diameters and lengths. Our cost-effective solutions enable distributors to maintain good profit margins while meeting diverse market demands with reliable, versatile hardware. 
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