S-91273A374 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing replacement frequency.
• Precise component alignment enabled by the 30mm shoulder with controlled tolerances, minimizing assembly errors and improving machinery performance.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
• Secure and efficient installation with the hex socket drive and knurled head, providing excellent torque transmission and anti-slip handling.
• Accurate and durable thread engagement due to Class 5g6g thread fit and coarse pitch, facilitating quick assembly and long-term stability.
• Compliance with stringent environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.
• Consistent dimensional accuracy with Rockwell B55 hardness, maintaining thread integrity and shoulder dimensions through repeated use.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address common industrial challenges such as misalignment and wear in rotating assemblies. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for applications in humid or chemically aggressive environments like food processing, marine equipment, and outdoor machinery. The 30mm shoulder length acts as a precise pivot or spacer, reducing stress on threads and ensuring smooth rotational movement in precision instruments, conveyor systems, and automation guides. With a hex socket drive and knurled head, it allows for secure tightening in confined spaces, enhancing assembly efficiency and reducing the risk of tool slippage. This design is ideal for industrial shoulder screws used in high-vibration settings, where consistent performance and durability are critical.

Specification Summary & Compliance

The screw features a metric thread with M4 size, 0.7mm coarse pitch, and Class 5g6g thread fit per ISO standards, ensuring precise tolerances for reliable fastening. Shoulder dimensions include a diameter of 4 mm with tolerance of -0.04 to -0.01 mm and length of 30 mm with tolerance of 0 to 0.25 mm, supporting accurate alignment. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for environmentally conscious industries.