S-92981A725 M20 ASME B18.3.3M Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: Alloy steel construction with Rockwell C32 hardness and 140,000 psi tensile strength ensures reliable performance under high-stress industrial conditions.
• Precision Shoulder for Accurate Alignment: 90mm shoulder length with ±0.25mm tolerance provides stable bearing surfaces and precise component positioning.
• Superior Corrosion Resistance: Black Oxide finish offers enhanced protection against rust and wear, extending service life in demanding environments.
• Secure & Efficient Installation: 12mm hex socket drive allows for high-torque application and prevents stripping, ensuring tight, reliable fastening.
• Industry-Standard Compliance: Manufactured to ASME B18.3.3M specifications with RoHS 3 and REACH compliance for safe, regulated use in global markets.
• Optimized Thread Performance: Class 4g6g thread fit with coarse 2.5mm pitch ensures quick assembly and robust holding power in dynamic applications.
• High Shear Strength: Minimum 84,000 psi shear strength provides added security against lateral forces in machinery and structural assemblies.

Professional Applications & Engineering Value

This M20x2.5 shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 90mm precision shoulder with tight tolerances acts as a dependable pivot or axle, reducing wear on moving parts and maintaining accurate component positioning. Made from alloy steel and treated with a Black Oxide finish, it resists corrosion and withstands high tensile and shear stresses, making it ideal for applications in robotics, conveyor systems, and heavy-duty fixtures. The socket head design with 12mm hex drive facilitates easy installation in confined spaces, while the coarse thread pitch ensures rapid, secure fastening even in vibrating environments. By combining robust material properties with exacting dimensional control, this shoulder screw delivers long-term reliability and reduces maintenance downtime in demanding engineering contexts.

Specification Summary & Compliance

This shoulder screw features a Class 4g6g thread fit per ISO standards, ensuring consistent engagement and performance. The shoulder diameter tolerance is maintained between -0.072 to -0.01 mm, and shoulder length tolerance is controlled within 0 to 0.25 mm for precise application. It is manufactured in compliance with ASME B18.3.3M and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for use in regulated and international industrial markets.