Unit 5 Rail Anchor | Railroad Fasteners

The Unit 5 rail anchor (also known as the Unit V or Unit 5 drive-on anchor) is a type of spring-steel railroad fastener designed to prevent the longitudinal movement of rails, a phenomenon known as "creep". It is widely used in North American railways and is a proven industry standard. 

Key Features and Specifications

• Function: The primary purpose is to hold the rail firmly against the edge of the tie (sleeper) and resist longitudinal forces caused by temperature changes, train traffic, and braking actions.

• Design: It is a one-piece, drive-on (knock-on) anchor made from heat-treated spring steel, typically 60Si2MnA. The design ensures proper fit on the rail base every time without causing damage to the rail.

• Compatibility: Unit 5 anchors are available for a variety of rail section sizes. Standard sizes are designed for a 5-1/2 inch rail base, fitting common rail sections like 110RE, 112RE, 115RE, and 119RE. They are also available in sizes for 6-inch base rails.

• Holding Power: It offers higher initial and retained holding power compared to other types of anchors, even after reapplication. Its performance exceeds AREMA (American Railway Engineering and Maintenance-of-Way Association) specifications.

• Installation: The drive-on design allows for fast, simple application using a standard spike maul or automated machinery and tooling, such as the Racine AM3 Anchor Applicator. 

The Unit 5 rail anchor is a widely used and essential component in railway track systems, primarily designed to secure the rails to wooden or concrete ties (sleepers). Rail anchors play a critical role in preventing longitudinal rail movement due to the dynamic loads generated by passing trains, thermal expansion, and vibrations from rail traffic. The Unit 5 rail anchor is known for its reliable performance, durability, and ease of installation, making it an ideal choice for both new track construction and track maintenance.

Applications of Unit 5 Rail Anchors

1. Freight Rail Systems

• In freight rail systems, heavy freight trains place significant stress on the track, which requires strong, durable fastening systems. Unit 5 rail anchors help prevent rail movement under the heavy dynamic loads of freight trains, ensuring the track stays stable and secure.

2. Passenger Rail Systems

• High-speed rail systems and passenger lines require precise track alignment for smooth, safe travel. Unit 5 anchors contribute to track stability and help maintain the correct gauge over time, ensuring the system operates safely.

3. Industrial Railways

• In industrial railways, which often see frequent rail traffic and heavy machinery moving along the track, Unit 5 rail anchors ensure that the rail remains securely fastened to the tie, preventing track misalignment.

4. Track Maintenance and Upgrades

• For track repairs and maintenance projects, Unit 5 rail anchors are often used to restore track stability and ensure the long-term performance of existing rail infrastructure.

The Unit 5 rail anchor is an essential component for maintaining the stability and alignment of railway tracks. Its ability to prevent longitudinal rail movement and ensure the correct track gauge makes it an ideal choice for freight, passenger, and industrial rail systems. The durability, corrosion resistance, and cost-effectiveness of Unit 5 rail anchors make them an invaluable part of track infrastructure projects worldwide.

For more information about the Unit 5 rail anchor or to request a quote for your next rail project, please contact us today. Let us help you ensure the safety and performance of your railway system with high-quality rail fastening solutions.