S-91273A436 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing maintenance costs.
• Superior strength and durability with a tensile strength of 70,000 psi and Rockwell B55 hardness, ensuring reliable performance under high stress.
• Precise alignment and secure pivoting enabled by the 50mm shoulder with tight diameter tolerance, minimizing component wear.
• Easy and secure installation with a 4mm hex socket drive and knurled head, providing excellent grip and preventing tool slippage.
• Wide compatibility and reliable fastening thanks to the M8x1.25 coarse thread with Class 5g6g fit, ensuring consistent engagement.
• Compliance with strict environmental regulations including RoHS 3 and REACH, making it suitable for global markets and sensitive applications.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to solve critical alignment and rotational challenges in demanding assemblies. The precision-ground 50mm shoulder acts as a dependable pivot or axle, eliminating the need for separate bushings and reducing assembly complexity. Manufactured from 18-8 stainless steel, it offers excellent resistance to rust and corrosion, which is vital for machinery in humid or washdown environments. The combination of a hex socket drive and knurled head texture ensures high torque application without cam-out, securing components in high-vibration applications like automation equipment, conveyor systems, and precision jigs. Its 70,000 psi tensile strength provides the structural integrity needed for heavy-duty use, making it a versatile and reliable industrial fastener.

Specification Summary & Compliance

This shoulder screw features an M8x1.25 metric coarse thread with a Class 5g6g thread fit for standard industrial applications. The shoulder diameter is held to a tight tolerance of -0.04 to -0.01 mm, and the shoulder length has a tolerance of 0 to 0.25 mm, ensuring high dimensional accuracy. The fastener is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances.