S-91273A349 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable performance under high stress.
• Precise component alignment enabled by the 55mm shoulder with controlled diameter tolerance, reducing wear and simplifying assembly.
• Secure, non-slip fastening thanks to the knurled head texture and 2mm hex socket drive, allowing for high torque application.
• Wide compatibility and reliable threading with M3 x 0.5mm coarse pitch and Class 5g6g thread fit, ensuring consistent engagement in metric assemblies.
• Compliance with stringent environmental regulations including RoHS 3 and REACH, making it suitable for global markets and sensitive applications.
• Optimized for demanding applications with a minimum shear strength of 35,000 psi, providing dependable performance in dynamic or high-load conditions.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 55mm shoulder length acts as a precise pivot or spacer, minimizing radial play and wear in moving parts commonly found in machinery, automation systems, and electronic enclosures. Manufactured from 18-8 Stainless Steel, it offers excellent resistance to rust and corrosion, which is vital for maintaining integrity in humid or chemically aggressive industrial environments. The hex socket drive and knurled head provide a secure grip for tools, preventing cam-out during installation and enabling reliable fastening in high-vibration applications. Its Class 5g6g thread fit and coarse pitch ensure quick assembly and robust thread engagement, reducing the risk of cross-threading and improving overall assembly efficiency and longevity.

Specification Summary & Compliance

This shoulder screw features an M3 x 0.5mm coarse pitch thread with a Class 5g6g thread fit for standard metric applications. The shoulder diameter is 3 mm with a tolerance of -0.04 to -0.01 mm, and the shoulder length is 55 mm with a tolerance of 0 to 0.25 mm, ensuring high dimensional accuracy. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in products requiring adherence to strict environmental and safety standards.