S-91273A333 M3 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
• Enhanced driving security thanks to the knurled hex socket head design, preventing tool slippage during installation
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under load
• Precision thread fit with Class 5g6g tolerance ensuring smooth assembly and consistent mating with nuts
• Durable shoulder design featuring a 16mm length for accurate component location and pivot applications
• Broad industrial compliance meeting RoHS 3 and REACH standards for safe, regulated use in global markets
• Optimized for coarse threading with 0.5mm pitch, enabling faster installation and reduced cross-threading risks

Professional Applications & Engineering Value

This M3 shoulder screw is engineered from 18-8 stainless steel to combat corrosion in demanding settings like machinery, automotive assemblies, and electronic enclosures. The 16mm shoulder length provides a precise unthreaded bearing surface, critical for aligning components and acting as a pivot or axle in rotating mechanisms. Its knurled hex socket head ensures a secure grip with standard 2mm hex tools, minimizing cam-out and enhancing torque transmission. The coarse metric thread (0.5mm pitch) and Class 5g6g thread fit facilitate quick, reliable fastening in high-vibration environments, reducing assembly time and improving joint integrity. Ideal for industrial shoulder bolt applications, it delivers long-term durability and consistent performance where precision and material integrity are paramount.

Specification Summary & Compliance

The screw adheres to metric thread standards with M3 x 0.5mm coarse pitch and Class 5g6g thread fit for dimensional accuracy. Shoulder diameter tolerance is -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, ensuring precise fits. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of restricted hazardous substances and safe for industrial use.