S-91273A422 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing maintenance costs.
• Exceptional mechanical strength offering 70,000 PSI tensile and 35,000 PSI shear strength for reliable performance in demanding applications.
• Precise component alignment enabled by the 6mm shoulder with a tight diameter tolerance of -0.04 to -0.01 mm, minimizing assembly play.
• Secure and efficient installation via the 4 mm hex socket and knurled head, providing excellent grip and reducing tool slippage.
• Consistent and reliable threading with a Class 5g6g fit and M8x1.25 coarse pitch, ensuring easy engagement and vibration resistance.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.
• Durable and long-lasting performance backed by Rockwell B55 hardness, resisting wear and deformation under load.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical assembly challenges in industries like automation, machinery, and precision equipment. The 18-8 Stainless Steel material provides excellent corrosion resistance, essential for operations in humid or chemically aggressive settings, thereby extending service life and reducing downtime. The integrated 6mm shoulder acts as a precise locating dowel, ensuring accurate alignment of components such as gears, pulleys, and bearings, which minimizes wear and prevents misalignment issues. The coarse thread pitch (1.25mm) and Class 5g6g thread fit facilitate quick assembly and offer enhanced vibration resistance, crucial for dynamic loads. Combined with a knurled hex socket head for secure driving, this precision shoulder screw delivers reliable fastening in high-stress applications, improving overall assembly integrity and performance.

Specification Summary & Compliance

This shoulder screw features a metric M8x1.25 coarse thread with a Class 5g6g thread fit for standard tolerance. The shoulder diameter is tightly controlled at 8 mm with a tolerance of -0.04 to -0.01 mm, and the shoulder length is 6 mm with a tolerance of 0 to 0.25 mm, ensuring precise fits. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55, it meets mechanical requirements including 70,000 PSI tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.