S-91273A821 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Superior wear protection and reduced light reflection from the durable black oxide finish, extending service life.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
• Precise alignment and spacing provided by the 16mm shoulder with tight tolerances, minimizing assembly errors.
• Secure, non-slip fastening enabled by the knurled socket head and 4mm hex drive, allowing for high-torque installation.
• Accurate and reliable thread engagement with Class 5g6g metric coarse thread fit, ensuring consistent performance in automated applications.
• Compliance with environmental regulations including RoHS 3 and REACH, making them suitable for global supply chains.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical alignment and pivot point requirements in industrial applications. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, which is crucial in machinery exposed to moisture or chemicals. The black oxide finish not only enhances durability but also reduces galling and seizing during repeated adjustments. The precision Class 5g6g thread fit and 16mm shoulder length with controlled tolerances ensure exact positioning in assemblies like rotating shafts, linkages, and jigs, reducing wear and maintenance downtime. The knurled socket head offers a secure grip for high-torque tools, making it ideal for automated production lines where reliability and speed are paramount.

Specification Summary & Compliance

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