S-91273A328 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 assembly grip and torque transmission from the knurled hex socket head, reducing tool slippage and improving operator efficiency.
• High mechanical strength and durability with a tensile strength of 70,000 psi and Rockwell B55 hardness, ensuring reliable performance under load.
• Precision alignment and spacing provided by the 12mm shoulder with controlled tolerances, minimizing component misalignment in assemblies.
• Consistent and reliable thread engagement with Class 5g6g metric coarse thread (M3x0.5), facilitating faster installation and reducing cross-threading risks.
• Broad regulatory compliance meeting RoHS 3 and REACH standards, ensuring safety and environmental responsibility for global supply chains.
• Optimized for standard tooling with a 2mm hex drive, streamlining maintenance and assembly processes in various applications.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical challenges in precision assembly, where component alignment and corrosion resistance are paramount. The 18-8 stainless steel material provides excellent durability against oxidation and chemical exposure, making it suitable for automotive, electronics, and machinery sectors. The knurled hex socket head enhances grip during high-torque applications, preventing stripping and ensuring secure fastening. With a 12mm shoulder length and tight diameter tolerances, it acts as a precise pivot or spacer, reducing wear and simplifying assembly in rotating mechanisms or industrial jigs. The coarse pitch thread (M3x0.5) allows for quick installation, while the Class 5g6g thread fit ensures consistent performance in dynamic loads, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw features a metric M3x0.5 coarse thread with a Class 5g6g thread fit for precise dimensional control. The shoulder diameter tolerance is -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, ensuring high accuracy in assembly. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets international standards for hazardous substance restrictions and environmental safety.