S-91273A338 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.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing in demanding applications.
• Precise thread engagement with Class 5g6g thread fit ensuring consistent, secure fastening and reduced risk of cross-threading.
• Secure, non-slip installation facilitated by the 2 mm hex socket drive and knurled head, allowing for high-torque application without tool slippage.
• Accurate component alignment due to the 21 mm shoulder length with tight tolerance, providing a stable pivot or spacer in assemblies.
• Environmental compliance assurance meeting RoHS 3 and REACH standards, making it suitable for regulated industries and global supply chains.
• Durable material hardness rated at Rockwell B55, resisting wear and deformation during repeated use or high-stress conditions.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and corrosion-induced failure. The 18-8 stainless steel material provides excellent resistance to rust and chemicals, extending component life in machinery, automotive, and electronics assemblies. Its hex socket head and knurled texture enable secure tool grip, preventing damage during installation in tight spaces. The Class 5g6g thread with coarse M3x0.5mm pitch ensures quick assembly and reliable holding power, while the precise 21mm shoulder length acts as a dependable axle or guide in rotating parts, reducing wear and maintenance needs. Ideal for precision applications like pivots, spacers, and jigs, this screw delivers consistent performance where dimensional accuracy and durability are critical.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M3 thread size, 0.5 mm pitch, and Class 5g6g thread fit for precise tolerance. Dimensions include a shoulder diameter of 3 mm (tolerance: -0.04 to -0.01 mm) and shoulder length of 21 mm (tolerance: 0 to 0.25 mm). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and suitable for various industrial and electronic applications.