S-90278A374 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh or washdown environments.
• Precise alignment and reduced wear thanks to the 20mm shoulder with tight length tolerance (±0.05mm) for accurate component positioning.
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Secure, flush installation enabled by the smooth socket head and 2.5mm hex drive, minimizing protrusion and providing a clean finish.
• Reliable thread engagement with a Class 6g thread fit and coarse M4 x 0.7mm thread for robust fastening in various materials.
• Environmental compliance assurance meeting RoHS 3 and REACH standards, ensuring safety and regulatory adherence.
• Versatile right-hand metric thread designed for broad compatibility in industrial machinery and assemblies.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and pivot point challenges in industrial applications. The 18-8 stainless steel material offers excellent resistance to rust and corrosion, making it suitable for equipment exposed to moisture, chemicals, or outdoor conditions. The 20mm shoulder length with minimal tolerance provides a precise unthreaded bearing surface, which prevents misalignment in moving parts such as gears, levers, and linkages. This reduces wear, minimizes maintenance, and extends the life of the assembly. The socket head with a 2.5mm hex drive allows for compact, secure installation in confined spaces, while the Class 6g thread fit and coarse M4 x 0.7mm thread ensure strong, reliable fastening in metals and plastics. Ideal for use in automation, machinery, and precision instruments, this screw delivers consistent performance and durability.

Specification Summary & Compliance

This M4 shoulder screw features a metric coarse thread (M4 x 0.7mm) with a Class 6g thread fit for standard industrial use. The shoulder diameter is 5 mm with a tolerance of -0.025 to 0 mm, and the shoulder length is 20 mm with a tolerance of 0 to 0.05 mm, ensuring precise fit and alignment. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its safety and environmental standards.