S-91273A427 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing replacement frequency.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation ensured by the 16mm shoulder length with controlled tolerances, minimizing component wear.
• Secure and efficient installation with a knurled hex socket head and 4mm drive, providing superior grip and reducing tool slippage.
• Accurate and durable threading via Class 5g6g metric coarse thread (M8x1.25mm), ensuring consistent fit and long-term fastening integrity.
• Enhanced durability and hardness with Rockwell B55 rating, resisting deformation under stress for extended service life.
• Compliance with global environmental standards including RoHS 3 and REACH, making it suitable for regulated industries and export markets.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical alignment and wear challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, which is vital for machinery operating in humid or chemically exposed settings. The 16mm shoulder length with tight tolerances acts as a precise pivot or spacer, reducing friction and preventing misalignment in rotating parts like bearings, gears, and linkages. Combined with a knurled hex socket head, it ensures secure torque application without cam-out, speeding up assembly in automated or manual processes. Its Class 5g6g coarse thread facilitates quick installation and robust holding power, making it a reliable choice for industrial equipment, automotive components, and electronic enclosures where vibration resistance and longevity are paramount.

Specification Summary & Compliance

The screw features a metric M8x1.25mm coarse thread with Class 5g6g thread fit per ISO standards, ensuring dimensional accuracy and interchangeability. Shoulder diameter tolerance is -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, supporting precise engineering fits. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its suitability for environmentally conscious and global industrial applications.