S-90278A421 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise component alignment thanks to the controlled shoulder diameter tolerance of 10mm ±0.025mm
• Exceptional mechanical strength with a tensile strength of 70,000 psi and Rockwell B55 hardness for reliable, long-term performance
• Secure, high-torque installation enabled by the 5mm hex socket drive, preventing tool slippage
• Accurate and consistent assembly with a Class 6g thread fit, ensuring proper mating with nuts and threaded holes
• Compliance with stringent environmental regulations, being RoHS 3 and REACH compliant for global market acceptance
• Optimized for quick assembly with a coarse M8x1.25mm thread, reducing installation time in production lines

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and durability challenges in demanding applications. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for machinery, automation systems, and outdoor equipment. The precise shoulder with tight diameter and length tolerances ensures accurate positioning of moving parts like gears and pulleys, reducing wear and maintenance. The socket head with a 5mm hex drive allows for high-torque tightening in confined spaces, while the Class 6g metric thread guarantees secure fastening. Ideal for use in industrial assemblies requiring reliable, repeatable performance, this screw minimizes downtime and enhances operational efficiency.

Specification Summary & Compliance

This M8 shoulder screw features a metric coarse thread with a pitch of 1.25mm and a Class 6g thread fit per ISO standards, ensuring dimensional accuracy. The shoulder diameter is 10mm with a tolerance of -0.025 to 0 mm, and the shoulder length is 18mm with a tolerance of 0 to +0.05 mm for precise fits. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for various industrial and export markets.