S-91273A331 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with 18-8 stainless steel material, ideal for harsh environments and extended service life.
• Superior strength and durability from Rockwell B55 hardness and 70,000 psi tensile strength, preventing failure under high stress.
• Secure, non-slip fastening thanks to the knurled hex socket head and 2 mm hex drive, allowing for high-torque installation.
• Precise component alignment and spacing enabled by the 14 mm shoulder with controlled length tolerance, reducing assembly errors.
• Reliable thread engagement with Class 5g6g fit and M3x0.5 coarse pitch, ensuring easy starting and robust connections.
• Compliance with global environmental standards including RoHS 3 and REACH, making it safe for regulated industries.
• Consistent dimensional accuracy with tight shoulder diameter and length tolerances, guaranteeing interchangeability and fit.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to solve critical alignment and pivot point challenges in precision assemblies. The 18-8 stainless steel construction offers excellent resistance to rust and corrosion, which is vital for machinery operating in moist or chemically aggressive settings. The knurled hex socket head provides a firm grip, reducing the risk of tool slippage during installation and enabling high clamping forces without damaging the drive. With a 14 mm shoulder length and controlled tolerances, it acts as a precise spacer or axle, maintaining exact part distances in applications like industrial machinery, electronics, and automotive components. The Class 5g6g thread fit and coarse pitch ensure quick assembly and reliable performance in vibrating environments, minimizing loosening and maintenance needs.

Specification Summary & Compliance

This shoulder screw adheres to metric (M3x0.5) thread standards with a Class 5g6g thread fit for consistent engagement. Dimensional precision includes a shoulder diameter tolerance of -0.04 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global supply chains.