S-91273A822 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and black oxide finish, ideal for harsh industrial environments.
• Enhanced durability and wear resistance from Rockwell B55 hardness, reducing replacement frequency.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for demanding applications.
• Precise alignment and spacing due to the 20mm shoulder with tight diameter tolerance (-0.04 to -0.01 mm).
• Secure and easy installation with a knurled socket head and 4 mm hex drive, preventing slippage.
• Reliable thread engagement from Class 5g6g thread fit and coarse M8x1.25 pitch, ensuring consistent performance.
• Compliance with environmental standards including RoHS 3 and REACH, meeting global regulatory requirements.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address common industrial challenges such as misalignment and component wear. The 18-8 stainless steel construction combined with a black oxide finish provides excellent corrosion resistance, making it suitable for machinery, automotive assemblies, and electronic enclosures exposed to moisture or chemicals. The 20mm precision shoulder ensures accurate positioning of parts like gears and pulleys, reducing vibration and extending equipment life. With a knurled socket head and Class 5g6g thread fit, it offers easy installation and reliable fastening in high-stress environments, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw features a metric M8x1.25 coarse thread with Class 5g6g thread fit for precise tolerance. The shoulder diameter tolerance is -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, ensuring high dimensional accuracy. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for industrial use.