S-91273A324 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
• Precise component alignment and reduced wear thanks to the 3mm shoulder diameter with tight tolerance (-0.04 to -0.01 mm).
• High mechanical strength and durability with a tensile strength of 70,000 psi and Rockwell B55 hardness for demanding applications.
• Reliable and secure fastening ensured by the Class 5g6g thread fit and M3 x 0.5mm coarse pitch for easier assembly and vibration resistance.
• Easy installation and removal with a 2mm hex socket drive and knurled head for improved grip and torque application.
• Consistent dimensional accuracy with an 8mm shoulder length and standard shoulder fit for predictable performance in assemblies.
• Compliance with environmental and safety standards including RoHS 3 and REACH, ensuring suitability for regulated industries.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical needs in precision machinery, automation systems, and electronic enclosures where misalignment and part wear are common failures. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, extending service life in humid or chemically aggressive settings. Its Class 5g6g thread fit and coarse 0.5mm pitch ensure quick, secure fastening with reduced risk of cross-threading, while the precisely machined shoulder acts as a pivot, bearing surface, or locator to maintain alignment in rotating assemblies. The knurled head and 2mm hex drive offer reliable tool engagement, minimizing slippage during high-torque installations. Ideal for applications demanding high tensile strength (70,000 psi) and shear strength (35,000 psi), this screw delivers consistent performance in robotics, conveyor systems, and fixture designs.

Specification Summary & Compliance

This metric shoulder screw adheres to precise dimensional standards, including a Class 5g6g thread fit for consistent engagement and a shoulder diameter tolerance of -0.04 to -0.01 mm. The shoulder length is 8 mm with a tolerance of 0 to 0.25 mm, ensuring reliable fit in assembly. It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing compliance with restrictions on hazardous substances for industrial and electronic use.