S-91273A361 M4 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 Rockwell B55 hardness for reliable load-bearing in demanding applications.
• Precise alignment and positioning enabled by the 4mm shoulder diameter with tight tolerances, reducing assembly errors and improving component fit.
• Secure and efficient installation through the hex socket drive and knurled head texture, preventing tool slippage and enabling high-torque fastening.
• Consistent thread engagement with Class 5g6g thread fit and coarse M4 x 0.7mm pitch, ensuring vibration resistance and easy assembly.
• Environmental and regulatory compliance meeting RoHS 3 and REACH standards, making it suitable for global supply chains and sensitive applications.
• Durable mechanical properties with a minimum shear strength of 35,000 psi, providing reliable performance under dynamic and static loads.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material resists corrosion, reducing maintenance in humid or chemical-exposed settings like industrial machinery, automation systems, and electronic enclosures. The 4mm shoulder diameter with controlled tolerances ensures exact component positioning, minimizing play and wear in rotating parts or bearing mounts. Combined with the Class 5g6g thread fit and coarse pitch, it offers quick, secure fastening that withstands vibrations, making it ideal for high-stress applications. The hex socket drive and knurled head further enhance installation reliability, supporting efficient production and long-term operational stability.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M4 x 0.7mm coarse thread and Class 5g6g thread fit for precise ISO-compliant tolerances. Shoulder diameter tolerance is -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, ensuring consistent dimensional accuracy. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated industrial and electronic uses without hazardous substances.