S-90278A508 M4 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.
• Precise alignment and smooth rotation ensured by the precisely machined 50mm shoulder with tight diameter tolerance, reducing wear on mating parts.
• High-strength fastening performance with a tensile strength of 70,000 psi and Rockwell B55 hardness for reliable load-bearing in demanding applications.
• Secure and flush installation using the hex socket drive, providing a clean profile and high torque capability without stripping.
• Consistent and reliable thread engagement with Class 6g thread fit and coarse M4 x 0.7mm pitch for quick assembly and vibration resistance.
• Compliance with stringent environmental regulations, including RoHS 3 and REACH, ensuring safety and suitability for global markets.
• Versatile metric sizing with standard M4 thread and 5mm thread length for easy integration into various mechanical designs.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address critical alignment and durability challenges in industrial assemblies. The 50mm shoulder length with precise diameter control acts as a pivot or axle, minimizing friction and misalignment in machinery, robotics, and precision instruments. Made from 18-8 stainless steel, it offers excellent resistance to corrosion and oxidation, ensuring long-term reliability in moist or chemically aggressive environments. The hex socket head design allows for compact installation in tight spaces, while the Class 6g thread fit and coarse pitch facilitate rapid, secure fastening that withstands operational vibrations. Ideal for applications requiring high-strength and dimensional stability, this screw enhances performance in automated systems, conveyor mechanisms, and electronic enclosures where precision shoulder screws are essential for maintaining tolerances and reducing maintenance downtime.

Specification Summary & Compliance

This metric shoulder screw features an M4 x 0.7mm thread with Class 6g thread fit and a shoulder diameter tolerance of -0.025 to 0 mm for precise assembly. The shoulder length is 50 mm with a tolerance of 0 to 0.05 mm, ensuring consistent performance. Manufactured from 18-8 stainless steel with a hardness of Rockwell B55 and tensile strength of 70,000 psi, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, guaranteeing environmental safety and regulatory adherence for industrial use.