S-92981A705 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 for reliable performance in high-stress assemblies.
• Precision-machined shoulder with tight diameter tolerance (-0.072 to -0.01 mm) ensures accurate alignment and smooth rotation in pivot and bearing applications.
• Corrosion-resistant black oxide finish on alloy steel provides enhanced durability and protection against wear in harsh industrial environments.
• Rockwell C32 hardness delivers superior resistance to deformation and maintains structural integrity under repeated use.
• Socket head with hex drive allows for easy installation and high torque application, reducing assembly time and tool slippage.
• Coarse metric thread (M20x2.5) with Class 4g6g fit ensures quick engagement and secure fastening in dynamic machinery components.
• Full compliance with ASME B18.3.3M, RoHS 3, and REACH guarantees adherence to international quality, safety, and environmental standards.

Professional Applications & Engineering Value

This M20 shoulder screw is engineered to address critical alignment and load distribution challenges in industrial machinery, automation systems, and heavy-duty equipment. The alloy steel construction with black oxide finish combats corrosion and extends service life in demanding environments like manufacturing and automotive assembly. The precisely machined shoulder diameter of 24 mm and length of 50 mm provides a stable bearing surface, reducing wear on moving parts and minimizing maintenance downtime. With its socket head design and hex drive, it enables secure installation in confined spaces, ensuring reliable performance in high-strength applications where vibration and dynamic loads are common.

Specification Summary & Compliance

This metric shoulder screw features a thread size M20x2.5 with Class 4g6g thread fit and coarse spacing for efficient assembly. Shoulder dimensions include a diameter of 24 mm (tolerance: -0.072 to -0.01 mm) and length of 50 mm (tolerance: 0 to 0.25 mm), ensuring precise engineering accuracy. It is manufactured in compliance with ASME B18.3.3M standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, providing assurance of quality and safety for global industrial use.