S-90278A371 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise alignment and reduced wear thanks to the accurately machined 12mm shoulder with tight tolerances
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Secure, tamper-resistant installation using the internal 2.5mm hex socket drive
• Reliable thread engagement ensured by the Class 6g thread fit and coarse M4 x 0.7mm metric thread
• Environmental compliance and safety with RoHS 3 and REACH regulations met
• Smooth head profile for a clean finish and reduced risk of snagging

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to solve critical alignment and pivot point challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for machinery, automotive, and electronic applications exposed to moisture or chemicals. The precise 12mm shoulder acts as a dependable locating dowel or bearing surface, minimizing part movement and wear between components. Combined with the Class 6g thread fit and hex socket drive, it ensures vibration-resistant fastening and easy installation in confined spaces, enhancing assembly accuracy and long-term operational reliability.

Specification Summary & Compliance

This precision metric shoulder screw features an M4 x 0.7mm coarse thread with a Class 6g thread fit. The shoulder diameter is 5mm with a tolerance of -0.025 to 0 mm, and the shoulder length is 12mm with a tolerance of 0 to 0.05 mm, ensuring a precise shoulder fit. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, guaranteeing it is free from hazardous substances for safe use in regulated industries.