S-90278A546 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life
• Precise component alignment enabled by the accurately machined shoulder with tight diameter and length tolerances
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications
• Secure, low-profile fastening with a smooth head and hex socket drive that prevents cam-out and allows for flush installations
• Easy assembly and interchangeability with a standard M3x0.5 coarse metric thread and Class 6g fit
• Environmental regulation compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Optimized for automated installation featuring a right-hand thread and consistent dimensions for high-volume production lines

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to solve critical alignment and spacing challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for medical devices, optical equipment, and electronics where cleanliness and durability are paramount. The 16mm shoulder length acts as a precise pivot or shaft, eliminating the need for additional bushings and reducing assembly components. The hex socket drive ensures high torque transmission without stripping, while the Class 6g thread fit guarantees consistent engagement in metric coarse thread applications. This combination delivers reliable performance in mechanisms requiring exact rotational clearance and robust fastening.

Specification Summary & Compliance

This precision shoulder screw features an M3x0.5 mm coarse metric thread with a Class 6g tolerance. The shoulder diameter is 4 mm with a tolerance of -0.025 to 0 mm, and the shoulder length is 16 mm with a tolerance of 0 to 0.05 mm, ensuring a precise fit. It is manufactured from 18-8 stainless steel and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.