S-92981A781 M5 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: Alloy steel construction with Rockwell C32 hardness delivers a high tensile strength of 140,000 psi, ensuring reliable performance under heavy loads and reducing the risk of fastener failure.
• Superior Corrosion Resistance: The Black Oxide finish provides a protective layer that significantly enhances resistance to rust and corrosion, extending the service life of the screw in harsh industrial environments.
• Precision Alignment & Smooth Rotation: The 6mm shoulder diameter with a tight tolerance of -0.072 to -0.01 mm ensures exact alignment for components like gears and bearings, minimizing wear and enabling smooth rotational movement.
• Secure & Easy Installation: A knurled socket head with a 3 mm hex drive offers improved grip and prevents tool slippage, allowing for straightforward installation and removal even in confined spaces.
• Optimized Thread Engagement: The M5x0.8 coarse thread pitch with Class 5g6g fit ensures quick assembly and a secure hold, reducing the time and effort required for fastening operations.
• Versatile Shoulder Length: A 70mm shoulder length provides ample unthreaded support for mounting multiple components, enhancing stability and reducing the need for additional spacers or washers.
• Compliance with Industry Standards: Meets ASTM A108 specifications and is compliant with RoHS 3 and REACH regulations, ensuring material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This M5 shoulder screw is engineered to address common challenges in precision machinery and assembly lines. The alloy steel core, hardened to Rockwell C32, provides the necessary tensile strength to withstand dynamic loads without deformation, making it ideal for high-stress applications like robotic arms and conveyor systems. The Black Oxide finish not only adds a layer of corrosion resistance but also reduces galling during installation, which is critical in automated environments where maintenance downtime must be minimized. The knurled socket head and hex drive design ensure that technicians can apply sufficient torque without stripping the head, enhancing safety and efficiency. With a 70mm shoulder length and precise shoulder diameter tolerance, this screw acts as a reliable pivot or axle, supporting rotating parts like pulleys and linkages while maintaining alignment. Its coarse thread pitch and Class 5g6g thread fit facilitate rapid assembly in production settings, reducing labor costs and improving throughput. Commonly used in automotive, aerospace, and industrial equipment, this metric shoulder screw delivers consistent performance where precision and durability are non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 5g6g thread fit for consistent engagement and a shoulder diameter tolerance of -0.072 to -0.01 mm to ensure exact component alignment. It conforms to ASTM A108 for material integrity and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing that it is free from hazardous substances and suitable for use in environmentally sensitive and regulated industries.