S-91273A348 M3 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 and pivot points enabled by the 50mm shoulder with controlled tolerances, minimizing assembly errors.
• High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under load.
• Secure and efficient installation with the hex socket drive and knurled head, preventing tool slippage and speeding up assembly.
• Consistent and reliable thread engagement due to the Class 5g6g thread fit, ensuring tight fastening in metric assemblies.
• Broad industrial compatibility with the M3x0.5mm coarse right-hand thread, fitting standard metric components seamlessly.
• Environmental and regulatory safety through RoHS 3 and REACH compliance, meeting global standards for restricted substances.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address common challenges in precision machinery, such as misalignment and wear in rotating assemblies. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, extending service life in humid or chemically exposed settings like industrial automation and electronic enclosures. The 50mm shoulder length acts as a stable shaft for gears, bearings, or linkages, reducing the need for additional bushings and simplifying design. Combined with the hex socket drive and knurled head texture, it ensures quick, tool-secure installation, which is critical in high-volume production lines. This screw’s Class 5g6g thread and coarse 0.5mm pitch further enhance reliability by preventing cross-threading and enabling rapid assembly in metric-based systems.

Specification Summary & Compliance

The screw features a Class 5g6g thread fit per metric standards, ensuring dimensional accuracy for the M3x0.5mm coarse thread. Shoulder diameter tolerance is -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, supporting precise engineering fits. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards without hazardous substances.