S-90278A311 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and washdown applications.
• Precise component alignment ensured by the 4mm shoulder with tight length tolerance (±0.05mm), reducing assembly errors and improving product quality.
• High-strength performance with a tensile strength of 70,000 psi and Rockwell B55 hardness, providing reliable, long-lasting fastening under load.
• Secure, tamper-resistant driving via the 2mm hex socket head, allowing for high torque application and a clean, flush finish.
• Accurate and reliable threading with Class 6g fit and M3 x 0.5mm coarse thread, enabling quick assembly and vibration resistance.
• Compliance with global standards including RoHS 3 and REACH, ensuring material safety and suitability for regulated industries.
• Dimensional stability from precise shoulder diameter tolerance (-0.025 to 0 mm), facilitating consistent fit in mating parts.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to solve critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive assemblies, and electronic devices exposed to moisture or chemicals. The 4mm precise shoulder length with tight tolerances acts as a pivot or shaft, ensuring components like gears, pulleys, and linkages are perfectly positioned, which minimizes wear and extends equipment life. Combined with the hex socket head and Class 6g thread fit, it allows for efficient installation in confined spaces while maintaining high tensile strength and reliability. This design is ideal for precision engineering where misalignment can lead to operational failures, providing a robust solution for OEMs and maintenance teams.

Specification Summary & Compliance

This precision shoulder screw features an M3 x 0.5mm coarse metric thread with a Class 6g thread fit for standard compatibility. The shoulder diameter tolerance is -0.025 to 0 mm, and shoulder length tolerance is 0 to 0.05 mm, ensuring high dimensional accuracy. Manufactured from 18-8 stainless steel with a tensile strength of 70,000 psi and Rockwell B55 hardness, it adheres to common industrial specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for global supply chains.