S-92981A730 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 shear strength, this screw withstands high-stress applications without failure.
• Superior Wear & Corrosion Resistance – The black oxide finish on alloy steel provides lasting protection against rust and abrasion in harsh environments.
• Precision Alignment & Smooth Rotation – A 24mm shoulder diameter with tight tolerance ensures accurate component positioning and reduces bearing wear.
• Reliable Thread Engagement – Class 4g6g thread fit and coarse M20x2.5 threads offer secure, vibration-resistant fastening in industrial assemblies.
• Easy Installation with High Torque Capability – The socket head with 12mm hex drive allows for quick, high-torque tightening using standard tools.
• Long Service Life – Rockwell C32 hardness ensures the screw maintains its structural integrity under repeated loads and impacts.
• Global Compliance & Safety – Meets ASME B18.3.3M specifications and is RoHS 3 & REACH compliant, ensuring safe use in regulated markets.

Professional Applications & Engineering Value

This M20 shoulder screw is engineered to address critical alignment and durability challenges in heavy machinery, automation systems, and precision equipment. The 100mm shoulder length and smooth shoulder fit provide a stable pivot or axle for rotating parts, minimizing misalignment and reducing wear on mating components. Made from alloy steel with black oxide finish, it resists corrosion in humid or chemically exposed settings, while the coarse metric thread ensures rapid assembly and reliable holding power in high-vibration environments. Ideal for use in conveyor systems, robotic arms, and industrial fixtures, this screw delivers consistent performance where precision shoulder bolts are essential for operational safety and efficiency.

Specification Summary & Compliance

This metric shoulder screw features a Class 4g6g thread fit with precise shoulder diameter tolerance of -0.072 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm. It conforms to ASME B18.3.3M manufacturing standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it meets international safety and quality requirements for industrial fasteners.