S-91273A337 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Precise component alignment thanks to the 20mm shoulder with tight diameter tolerance, reducing assembly errors and improving machine performance.
• High-strength reliability offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding mechanical applications.
• Secure, non-slip installation with a knurled head and 2mm hex socket drive, ensuring firm tool grip and reduced stripping risk.
• Consistent thread engagement with Class 5g6g thread fit and M3 x 0.5mm coarse pitch for quick assembly and vibration resistance.
• Enhanced durability from Rockwell B55 hardness, providing excellent wear resistance in high-cycle operations.
• Regulatory compliance assurance meeting RoHS 3 and REACH standards, ensuring safe use in global industrial markets.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material offers excellent corrosion resistance, making it suitable for applications in electronics, automotive, and machinery exposed to moisture or chemicals. The 20mm shoulder length provides a stable bearing surface for rotating parts like gears and pulleys, minimizing misalignment and reducing wear on components. With a hex socket drive and knurled head, it ensures secure fastening in tight spaces, while the Class 5g6g thread fit guarantees reliable performance in vibrating environments. Ideal for use in jigs, fixtures, and conveyor systems, this screw enhances operational efficiency and reduces maintenance needs.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter tolerance of -0.04 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm, ensuring consistent fit in metric applications. It adheres to ISO metric thread standards with M3 size and 0.5 mm coarse pitch, and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and material restrictions.