S-92981A796 M8 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional durability and corrosion resistance with a black oxide finish that protects against wear in demanding industrial environments.
• High tensile strength of 140,000 psi ensures reliable performance under heavy loads and prevents failure in critical applications.
• Precision-machined shoulder with tight length tolerance (±0.25mm) provides accurate alignment and spacing for rotating components like gears and pulleys.
• Rockwell C32 hardness offers excellent resistance to deformation and maintains thread integrity over repeated use.
• Class 5g6g thread fit with coarse pitch allows for quick assembly and secure fastening, reducing installation time.
• Knurled head and hex socket drive enable easy grip and high-torque installation without slipping, even in confined spaces.
• Compliance with ASTM A108, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address common challenges in machinery assembly, such as misalignment and component wear. The alloy steel construction, combined with a black oxide finish, provides superior resistance to corrosion and abrasion, extending service life in harsh conditions. The precisely machined 110mm shoulder length with minimal tolerance ensures exact positioning for bearings, linkages, and rotating parts, reducing vibration and improving operational efficiency. Its coarse metric thread (M8x1.25mm) and hex socket drive facilitate quick, secure installations, making it ideal for automation equipment, automotive systems, and industrial machinery where reliability and precision are critical.

Specification Summary & Compliance

This shoulder screw features a Class 5g6g thread fit per metric standards, ensuring consistent engagement and load distribution. The shoulder diameter tolerance is tightly controlled at -0.072 to -0.01 mm for precise fits. It is manufactured in accordance with ASTM A108 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safe and environmentally responsible use in industrial applications.