S-92981A735 M20 ASME B18.3.3M Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity – With 140,000 psi tensile strength and 84,000 psi minimum shear strength, this shoulder screw reliably handles high-stress applications without failure.
• Superior Wear & Corrosion Resistance – The black oxide finish on alloy steel provides enhanced durability and protection in harsh industrial environments.
• Precision Alignment & Stability – A 120 mm shoulder length with controlled tolerances ensures accurate component positioning and reduces misalignment in assemblies.
• Optimized for High-Torque Applications – The 12 mm hex socket drive allows for secure, high-torque installation, minimizing stripping and improving assembly efficiency.
• Consistent Thread Performance – Class 4g6g thread fit with coarse 2.5 mm pitch ensures reliable engagement and easier installation in demanding conditions.
• Broad Industry Compliance – Meets ASME B18.3.3M standards and is RoHS 3 & REACH compliant, ensuring safety and regulatory acceptance.
• Robust Material Integrity – Rockwell C32 hardness provides excellent resistance to deformation under heavy loads, extending service life.

Professional Applications & Engineering Value

This M20 shoulder screw is engineered to address critical alignment and load distribution challenges in precision machinery, automation systems, and heavy-duty equipment. The alloy steel construction, combined with a black oxide finish, offers superior resistance to wear and environmental factors, reducing maintenance needs. The 120 mm shoulder length provides a stable, unthreaded bearing surface that prevents component shifting and absorbs radial loads effectively. With its coarse 2.5 mm pitch and Class 4g6g thread fit, this metric shoulder screw ensures quick, secure fastening in high-vibration settings, making it ideal for robotics, conveyor systems, and industrial fixtures where reliability is non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3.3M specifications, with a Class 4g6g thread fit ensuring precise dimensional accuracy. The shoulder diameter tolerance is -0.072 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, guaranteeing consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use.