S-91273A777 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Enhanced wear resistance and reduced light glare from the black oxide finish, providing a durable and low-profile appearance.
• Precise component alignment and pivot points enabled by the 16mm shoulder with tight diameter tolerance, minimizing assembly play.
• High-strength fastening performance with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi for reliable load-bearing applications.
• Secure, slip-resistant installation using the 2 mm hex socket drive and knurled head, allowing for high torque application and easy handling.
• Consistent and reliable thread engagement with a Class 5g6g thread fit on the M3 x 0.5mm coarse thread, ensuring vibration resistance.
• Compliance with stringent environmental regulations, being RoHS 3 and REACH compliant for use in regulated markets.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to solve critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for automotive, electronics, and machinery applications exposed to moisture or chemicals. The black oxide finish not only enhances corrosion protection but also reduces galling during installation. The precise 16mm shoulder length acts as a built-in spacer or pivot, eliminating the need for additional bushings and ensuring accurate component positioning in linkages, gears, and rotating mechanisms. The hex socket drive and knurled head provide secure tool engagement, which is essential for high-vibration environments where fastener integrity is paramount.

Specification Summary & Compliance

This shoulder screw features an M3 x 0.5mm coarse metric thread with a Class 5g6g thread fit for standard industrial applications. The shoulder diameter tolerance is -0.04 to -0.01 mm, and the shoulder length tolerance is 0 to 0.25 mm, ensuring high dimensional accuracy. It is manufactured from 18-8 stainless steel with a hardness of Rockwell B55 and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global markets and environmentally conscious manufacturing.