S-91273A346 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.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation enabled by the 3mm shoulder diameter with tight tolerance, reducing wear on mating components.
• Secure, non-slip installation with a knurled hex socket head and 2mm drive, ensuring firm tool grip and reduced cam-out risk.
• Consistent thread engagement through Class 5g6g thread fit and M3 x 0.5mm coarse thread, providing vibration resistance and easy assembly.
• Durability under shear stress with a minimum shear strength of 35,000 psi, enhancing fastener integrity in dynamic loads.
• Compliance with global standards including RoHS 3 and REACH, ensuring environmental safety and regulatory acceptance for international projects.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 40mm shoulder length provides a stable pivot or bearing surface, minimizing misalignment in machinery, robotics, and electronic enclosures. Made from 18-8 stainless steel, it resists corrosion and maintains integrity in moist or chemical-exposed settings. The hex socket drive with knurled texture ensures secure torque application, reducing slippage during high-tension fastening. With a Class 5g6g thread fit and coarse pitch, it offers reliable threading in metals and plastics, preventing loosening under vibration. Ideal for industrial automation and precision equipment, this screw enhances assembly accuracy and long-term performance.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M3 x 0.5mm coarse thread and Class 5g6g thread fit for precise tolerance. The shoulder diameter is 3mm with a tolerance of -0.04 to -0.01 mm, and shoulder length is 40mm with a 0 to 0.25 mm tolerance, ensuring consistent dimensions. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for global engineering applications.