S-91273A438 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 ensured by the 70mm shoulder with tight ±0.25mm length tolerance
• High mechanical reliability with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure and efficient installation using the 4mm hex drive and knurled head for enhanced grip
• Accurate thread engagement with Class 5g6g thread fit, reducing the risk of cross-threading
• Durable wear resistance due to Rockwell B55 hardness, extending service life in high-cycle operations
• Compliance with environmental regulations, meeting RoHS 3 and REACH standards for global supply chain use

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for machinery exposed to moisture or chemicals. The 70mm shoulder length with minimal tolerance ensures precise positioning of components like gears, pulleys, and linkages, reducing wear and misalignment. The coarse M8x1.25 thread and Class 5g6g fit facilitate quick assembly while maintaining secure fastening under vibration. With a knurled head and hex drive, it offers easy installation in tight spaces, enhancing efficiency in automated equipment, conveyor systems, and precision instruments where reliability is paramount.

Specification Summary & Compliance

This metric shoulder screw features an M8x1.25 coarse thread with Class 5g6g thread fit for standard tolerance. The shoulder diameter is 8 mm with a tolerance of -0.04 to -0.01 mm, and the shoulder length is 70 mm with a 0 to 0.25 mm tolerance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries.