S-90278A547 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
• Enhanced durability and strength from Rockwell B55 hardness and 70,000 psi tensile strength, ensuring reliable performance under load.
• Precise alignment and secure pivoting with a Class 6g thread fit and an 18mm shoulder length, minimizing part movement and wear.
• Secure, high-torque installation using a 2mm hex drive socket head, reducing the risk of stripping and enabling efficient assembly.
• Broad compatibility with coarse M3 x 0.5mm metric threading, facilitating easy integration into standard industrial equipment.
• Strict environmental compliance with RoHS 3 and REACH regulations, ensuring safety and sustainability in global supply chains.

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 offers excellent resistance to rust and corrosion, making it suitable for machinery, automotive, and electronics applications exposed to moisture or chemicals. The 18mm precise shoulder length acts as a reliable pivot or spacer, maintaining exact part positioning and reducing stress on threaded sections. Combined with a Class 6g thread fit and coarse thread spacing, it ensures quick, secure fastening in high-vibration environments. The socket head with a 2mm hex drive allows for compact, flush installations in tight spaces, enhancing both performance and aesthetics in industrial shoulder screw applications.

Specification Summary & Compliance

This precision metric shoulder screw features M3 x 0.5mm coarse threads with a Class 6g thread fit for standard metric tolerances. The shoulder diameter is 4mm with a tolerance of -0.025 to 0 mm, and the shoulder length is 18mm with a tolerance of 0 to 0.05 mm, ensuring precise shoulder fit. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.