S-90318A770 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 Stainless Steel construction, ensuring long-term reliability and reduced maintenance costs.
• Exceptional mechanical strength with a tensile strength of 70,000 psi and Rockwell B70 hardness, providing dependable performance under high-stress conditions.
• Precise component alignment is guaranteed by the accurate 5mm shoulder with tight tolerances, minimizing assembly play and vibration.
• Space-saving ultra-low socket head design allows for use in compact assemblies while offering secure engagement with a standard 2.5mm hex key.
• Reliable and coarse M4 x 0.7mm thread with Class 6g fit ensures easy, fast assembly and strong holding power in a wide range of materials.
• Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications.
• High shear strength (minimum 35,000 psi) provides robust resistance to lateral forces, enhancing joint integrity.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to solve critical alignment and corrosion challenges in demanding industrial settings. The 316 Stainless Steel material offers excellent resistance to chemicals and moisture, making it ideal for food processing, marine, and chemical industry equipment where corrosion can cause premature failure. The precise shoulder acts as a built-in locating dowel, ensuring accurate positioning of parts like gears, pulleys, and bearings without the need for additional components. This eliminates misalignment issues, reduces assembly time, and increases the lifespan of the machinery. The combination of the ultra-low socket head and coarse metric thread allows for efficient installation in tight spaces while maintaining a high clamp load, providing a reliable fastening solution for automation systems, precision instruments, and heavy-duty mechanical assemblies.

Specification Summary & Compliance

This precision shoulder screw features an M4 x 0.7mm coarse metric thread with a Class 6g tolerance for consistent fit. The shoulder diameter is 5mm with a tolerance of -0.025 to 0 mm, and the shoulder length is 5mm with a tolerance of 0 to 0.05 mm, ensuring high dimensional accuracy. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming it is free of restricted hazardous substances and suitable for use in regulated markets.