S-90278A551 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 spacing ensured by the 35mm smooth shoulder with tight diameter tolerance, reducing assembly errors.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications.
• Secure and flush installation with the hex socket head and 2mm drive, allowing high torque application in confined spaces.
• Consistent thread engagement with Class 6g metric coarse thread (M3x0.5), providing reliable fastening and vibration resistance.
• Environmental compliance assurance meeting RoHS 3 and REACH standards, ensuring safety and regulatory adherence.
• Durable and maintenance-free operation due to the material's inherent properties, reducing long-term replacement costs.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, making it suitable for applications in electronics, automotive, and machinery exposed to moisture or chemicals. The 35mm shoulder length with precise diameter control acts as a pivot or spacer, ensuring accurate component positioning and reducing wear from rotational movement. Combined with the hex socket head and Class 6g thread fit, it enables secure fastening in tight spaces while maintaining high tensile strength. This design minimizes assembly time, prevents loosening under vibration, and extends the lifespan of high-precision equipment.

Specification Summary & Compliance

The screw features a metric coarse thread (M3x0.5) with Class 6g thread fit per ISO standards, ensuring interchangeability and reliable performance. Shoulder dimensions include a diameter of 4 mm with tolerance of -0.025 to 0 mm and length of 35 mm with tolerance of 0 to 0.05 mm for precise fit. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances. Manufactured to consistent quality standards, this fastener meets industrial requirements for strength, durability, and safety.