S-90278A428 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life
• Precise alignment and smooth rotation enabled by the 40mm shoulder with tight length tolerance (±0.05mm) and 10mm diameter for accurate component positioning
• High-strength fastening with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable performance under mechanical stress
• Secure, tamper-resistant installation using the 5mm hex socket drive, providing efficient torque transfer and a clean, smooth head profile
• Consistent thread engagement with Class 6g fit and M8x1.25mm coarse pitch, facilitating quick assembly and reducing cross-threading risks
• Environmental compliance assurance meeting RoHS 3 and REACH standards, making it suitable for regulated industries and global supply chains
• Versatile right-hand metric threading designed for standard industrial applications, ensuring broad compatibility and easy replacement

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for machinery, automation systems, and equipment exposed to moisture or chemicals. The 40mm shoulder length with minimal tolerance provides a stable bearing surface for pivoting parts, reducing wear and ensuring precise component location in assemblies like rotating shafts, linkages, and jigs. Combined with the M8x1.25mm coarse thread and Class 6g thread fit, it enables rapid, secure fastening while maintaining high tensile strength for load-bearing tasks. The hex socket drive allows for compact design integration and reliable torque application, minimizing the risk of stripping in high-vibration environments.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M8 thread size, 1.25mm pitch, and Class 6g thread fit for consistent dimensional accuracy. The shoulder features a diameter of 10mm with a tolerance of -0.025 to 0 mm and a length of 40mm with a tolerance of 0 to 0.05 mm, ensuring precise fit in demanding applications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in products requiring environmental and safety standards.