S-91273A376 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing maintenance costs.
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation enabled by the 40mm shoulder with standard fit, minimizing wear on mating components.
• Secure, non-slip fastening thanks to the knurled head texture and 2mm hex socket drive, allowing for high-torque installation.
• Accurate and consistent threading with Class 5g6g thread fit and M4x0.7 coarse pitch, providing easy assembly and vibration resistance.
• Environmental and safety compliance meeting RoHS 3 and REACH regulations, ensuring suitability for global markets and sensitive applications.
• Durable, long-lasting operation with a minimum shear strength of 35,000 psi, supporting repeated use in industrial machinery.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and corrosion-induced failure. The 18-8 stainless steel material offers excellent resistance to rust and chemicals, making it suitable for precision machinery, automotive assemblies, and electronic enclosures exposed to moisture. The 40mm shoulder length acts as a precise pivot or spacer, reducing stress on the Class 5g6g metric threads and ensuring smooth rotational movement in pivots, linkages, and bearing supports. Combined with the hex socket drive and knurled head, it enables secure installation in tight spaces, enhancing assembly efficiency and equipment longevity in high-strength applications.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M4x0.7 coarse thread and Class 5g6g thread fit for consistent engagement. Shoulder dimensions include a 4mm diameter with a tolerance of -0.04 to -0.01 mm and a 40mm length with a 0 to 0.25 mm tolerance, ensuring precise alignment. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for restricted substance use in industrial components.