S-90278A544 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise component alignment ensured by the 12mm shoulder with tight length tolerance (0 to 0.05mm)
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing
• Secure hex drive engagement using a standard 2mm hex key, preventing stripping and ensuring consistent torque application
• Accurate thread fit with Class 6g tolerance and coarse M3 x 0.5mm thread for quick assembly and vibration resistance
• Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Smooth head surface reducing friction and potential damage to mating components during installation

Professional Applications & Engineering Value

This M3 shoulder screw delivers exceptional engineering value in applications requiring precise shaft positioning and rotational control. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for machinery exposed to moisture, chemicals, or outdoor conditions. The 12mm shoulder length with precise tolerances acts as a dependable locating dowel, eliminating misalignment in assemblies like bearings, gears, and pulleys. The socket head hex drive allows for high-torque installation in confined spaces, while the coarse metric thread ensures rapid assembly and maintains integrity under vibration. These features collectively solve critical industrial challenges of component slippage, corrosion-induced failure, and assembly inefficiency in automation equipment, precision instruments, and mechanical linkages.

Specification Summary & Compliance

This precision shoulder screw features M3 x 0.5mm coarse metric thread with Class 6g fit and right-hand direction. The shoulder diameter is 4mm with a tolerance of -0.025 to 0mm, and shoulder length is 12mm with 0 to 0.05mm tolerance. Manufactured from 18-8 stainless steel with Rockwell B55 hardness and 70,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety.