S-92981A711 M20 ASME B18.3.3M Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with a durable black oxide finish, extending service life in harsh industrial environments.
• Exceptional mechanical strength from alloy steel construction, offering 140,000 psi tensile and 84,000 psi shear strength for demanding applications.
• Precise location and smooth rotation enabled by the 60mm shoulder with controlled diameter tolerance, reducing wear on mating parts.
• Reliable, coarse-pitch metric thread (M20x2.5) with Class 4g6g fit for secure fastening and easier assembly in high-vibration settings.
• Secure, high-torque installation using the 12mm hex socket drive, preventing tool slippage and ensuring consistent clamping force.
• Compliance with major industry standards including ASME B18.3.3M, ensuring dimensional consistency and interchangeability.
• Environmentally conscious manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

This M20 shoulder screw is engineered to provide a robust and precise locating pin and fastener in one component. The alloy steel core, heat-treated to Rockwell C32 hardness, resists deformation under heavy loads, while the black oxide finish adds a layer of protection against rust and corrosion, crucial for machinery operating in humid or corrosive environments. The 60mm shoulder length with its precise diameter acts as a pivot or axle, maintaining alignment in assemblies like linkages, gears, and pulleys, which reduces bushing wear and prevents axial movement. The coarse metric thread (M20x2.5) and Class 4g6g thread fit ensure rapid assembly and a secure hold, even in applications subject to vibration and dynamic stresses. Its socket head design allows for installation in confined spaces, making it an ideal precision shoulder bolt for automotive, industrial automation, and heavy equipment manufacturing.

Specification Summary & Compliance

This metric shoulder screw features an M20x2.5 coarse thread with a Class 4g6g thread fit, ensuring standard tolerance for reliable engagement. The shoulder diameter is manufactured to a tight tolerance of -0.072 to -0.01 mm, and the shoulder length tolerance is 0 to 0.25 mm, guaranteeing precise dimensional accuracy. It is manufactured in accordance with ASME B18.3.3M specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.