Crossarm Pin
Crossarm pins are essential insulator fittings in utility pole hardware designed to support pin-type insulators. These pins are available in various types, including long shank and short shank models, tailored to fit different applications. Typically forged from durable materials like alloy steel or ductile iron, crossarm pins are used to secure insulators with standard 1-inch threaded pinholes onto wooden or steel crossarms. Their primary function is to provide a stable connection for insulators, ensuring efficient power distribution and transmission. To install crossarm pins, they are mounted onto crossarms using bolts and washers, and the insulators are threaded onto the pin’s top.
The structure of crossarm pins includes a large base that distributes loads evenly across flat wood crossarms, preventing damage or crushing. They also feature a square wrenching shoulder for easy alignment during installation. Crossarm pins are commonly used with other pole line hardware such as crossarms, braces, and insulators. Long shank versions come with additional hardware like square washers and locknuts for added stability, while short shank versions include coil lockwashers for steel crossarms.
Designed to meet industry standards, crossarm pins are galvanized for corrosion resistance and long-term durability. These versatile components are vital in creating reliable utility pole systems, offering robust support for electrical lines in various weather conditions.
Key Features:
- Forged from alloy steel or ductile iron for superior strength.
- Galvanized coating ensures excellent corrosion resistance.
- Large base design prevents damage to wooden crossarms.
- Square wrenching shoulder allows precise alignment during installation.
- Compatible with standard 1-inch threaded pinhole insulators.
Crossarm Pin Drawing
| CATALOG NUMBER NYLON THREAD | CATALOG NUMBER LEAD THREAD | “A” | “B” | “C” | “D” |
| 4705P | 4705 | 5.0 | 2.5 | 2.6 | 2.25 (3/16” THICK) |
| 4706P | 4706 | 6.0 | 3.5 | 2.6 | 2.25 (3/16” THICK) |
| PSC2060945P | 6.0 | 3.5 | 2.6 | 4.0 (1/4” THICK) | |
| PSC2060950P | 8.0 | 2.5 | 2.6 | 4.0 (1/4” THICK) | |
| PSC2061144P | 8.0 | 2.5 | 3.0 | 4.0 (1/4” THICK) | |
| PSC2061175P | 6.0 | 3.5 | 2.6 | 2.25 (3/16” THICK) |
Frequently Asked Questions (FAQ)
What is the purpose of a Crossarm Pin?
A Crossarm Pin is used to support pin-type insulators on utility poles. It provides a secure mounting point for insulators, ensuring proper alignment and stability for power distribution and transmission lines.
What materials are Crossarm Pins typically made from?
Crossarm Pins are commonly made from forged steel or ductile iron. They are often hot-dip galvanized to resist corrosion and meet industry standards for durability and strength.
What are the common thread sizes for Crossarm Pins?
Crossarm Pins typically feature NEMA standard thread sizes, such as 1 inch or 1-3/8 inches. These threads ensure compatibility with standard insulators used in utility applications.
How are Crossarm Pins mounted on crossarms?
Crossarm Pins are mounted using bolts or other hardware, such as carriage bolts and square nuts. They are designed to securely attach to wooden, fiberglass, or steel crossarms.
Are Crossarm Pins compatible with fiberglass crossarms?
Yes, most Crossarm Pins are compatible with fiberglass crossarms. However, it is recommended to use washers that extend the width of the arm to ensure proper engagement and stability.
What coating is applied to Crossarm Pins for protection?
Crossarm Pins are often hot-dip galvanized to meet ASTM Specification A153. This coating provides excellent protection against rust and corrosion in outdoor environments.
Can Crossarm Pins be used with double arming bolts?
Yes, Crossarm Pins can be used with double arming bolts for applications requiring additional strength or dual crossarms on utility poles.
What is the load capacity of a typical Crossarm Pin?
The load capacity of a Crossarm Pin depends on its size and material. For example, 5/8-inch pins can handle tensile strengths up to 13,550 lbf, while larger pins like 1-inch can support up to 36,350 lbf.
How do I choose the right Crossarm Pin for my application?
Selecting the right Crossarm Pin involves considering factors such as thread size, material, coating, and compatibility with the crossarm type (wooden or fiberglass). Consulting product specifications and industry standards can help in making the right choice.
