S-91273A473 M12 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.
• Enhanced assembly grip and torque application provided by the knurled hex socket head, reducing tool slippage and improving operator safety.
• High mechanical strength and durability with a tensile strength of 70,000 psi and Rockwell B55 hardness, ensuring reliable performance under load.
• Precise component alignment and spacing enabled by the 45mm shoulder with controlled diameter tolerance, minimizing part movement and wear.
• Reliable thread engagement due to the Class 5g6g thread fit and coarse M12x1.75 thread, facilitating faster assembly and vibration resistance.
• Broad industrial compatibility with metric (M12) coarse threading and standard hex drive (6mm), ensuring easy integration into existing machinery and tooling.
• Compliance with stringent environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

This M12 shoulder screw is engineered to address critical challenges in precision assembly and motion control systems. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, which is vital for equipment operating in humid or chemically aggressive environments like food processing, marine, or outdoor machinery. The 45mm shoulder length acts as a precise pivot, axle, or spacer, maintaining accurate alignment between components such as gears, bearings, and linkages, thereby reducing eccentric wear and preventing premature failure. The knurled hex socket head ensures a secure grip during high-torque installation, even in confined spaces, enhancing assembly efficiency and reducing the risk of stripped drives. Combined with the Class 5g6g thread fit, this screw delivers consistent clamping force and vibration resistance in automated systems, conveyor setups, and precision instruments, ensuring long-term operational stability and minimal maintenance.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M12x1.75 coarse thread and Class 5g6g thread fit for precise tolerance. The shoulder diameter is manufactured to a tight tolerance of -0.04 to -0.01 mm, and the shoulder length tolerance is 0 to 0.25 mm, ensuring high dimensional accuracy. It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming the absence of restricted hazardous substances, and is suitable for use in regulated industrial and electronic applications.