S-92981A780 M4 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability: Alloy steel construction with Black Oxide finish provides superior corrosion resistance and long-lasting performance in demanding industrial environments.
• Precision Alignment: 60mm shoulder length with tight tolerance ensures accurate component positioning, reducing assembly errors and improving machine reliability.
• High Tensile Strength: Rockwell C32 hardness delivers 140,000 psi tensile strength, offering exceptional load-bearing capacity for high-stress applications.
• Secure Fastening: Class 5g6g thread fit with coarse M4x0.7 metric thread ensures consistent, vibration-resistant connections in automated systems.
• Easy Installation: Hex socket drive with 2.5mm size and knurled head allows for quick, slip-resistant tightening using standard tools, speeding up assembly processes.
• Broad Compliance: Meets ASTM A108 specifications and is RoHS 3 and REACH compliant, ensuring material safety and regulatory adherence for global supply chains.
• Versatile Application: Standard shoulder fit and right-hand thread design make it ideal for pivots, axles, and spacers in machinery, automotive, and electronics.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The alloy steel core, hardened to Rockwell C32, withstands repetitive loads and shocks, preventing premature failure in industrial machinery and automation equipment. The Black Oxide finish adds a protective layer against rust and wear, extending service life in humid or abrasive conditions. With a 60mm shoulder length maintained to tight tolerances, it acts as a reliable pivot or guide for rotating parts, minimizing misalignment and reducing maintenance downtime. The coarse metric thread (M4x0.7) and Class 5g6g fit ensure quick engagement and stable fastening, even in high-vibration settings like robotics or conveyor systems. Ideal for use in precision engineering applications, this screw enhances assembly accuracy and operational efficiency.

Specification Summary & Compliance

This shoulder screw adheres to metric system dimensions with a Class 5g6g thread fit for precise engagement. The shoulder diameter tolerance is -0.072 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, ensuring high dimensional accuracy. It conforms to ASTM A108 standards for material properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material traceability.