S-90278A548 M3 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 pivot function enabled by the 20mm shoulder with a tight diameter tolerance, reducing component wear and simplifying assembly.
• High-strength fastening with a tensile strength of 70,000 psi and Rockwell B55 hardness, ensuring reliable performance under load.
• Secure, low-profile installation using the 2mm hex socket drive, providing a flush finish and preventing tool slippage.
• Consistent and reliable thread engagement with a Class 6g metric thread fit, minimizing the risk of cross-threading and ensuring vibration resistance.
• Broad industrial compatibility due to compliance with RoHS 3 and REACH regulations, making it suitable for global supply chains.
• Optimized for high-volume assembly with a coarse M3x0.5 thread pitch, allowing for quicker installation and reduced assembly time.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address common challenges in machinery assembly, such as misalignment and bearing wear. The 20mm shoulder length with a precise diameter acts as a reliable pivot or spacer, maintaining exact part positioning in industrial applications like linkages, gears, and rotating assemblies. Manufactured from 18-8 stainless steel, it offers excellent resistance to rust and corrosion, which is critical in demanding environments. The Class 6g thread fit and coarse thread spacing ensure quick, secure fastening with high vibration resistance, reducing maintenance needs. The combination of a socket head with a 2mm hex drive allows for compact designs and easy access in confined spaces, making it a versatile solution for OEMs and maintenance teams seeking durability and precision.

Specification Summary & Compliance

This M3 shoulder screw features a Class 6g thread fit with a 0.5mm pitch and coarse spacing, ensuring metric standard compatibility. The shoulder diameter tolerance is -0.025 to 0 mm, and the shoulder length tolerance is 0 to 0.05 mm, providing high precision for engineering applications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and global industrial use.