S-91273A428 M8 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 18mm shoulder with tight diameter tolerance (-0.04 to -0.01 mm).
• High-strength fastening with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
• Secure, non-slip installation using the 4mm hex socket drive and knurled head for enhanced grip.
• Reliable thread engagement with Class 5g6g thread fit and coarse 1.25mm pitch for quick assembly.
• Consistent performance backed by Rockwell B55 hardness, ensuring durability under repeated use.
• Environmental compliance meeting RoHS 3 and REACH standards for safe, sustainable manufacturing.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to solve critical alignment and durability challenges in industrial machinery. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for applications exposed to moisture or chemicals. The 18mm shoulder length acts as a precise pivot or spacer, preventing misalignment in assemblies like rotating shafts, gears, and linkages. The hex socket drive and knurled head allow for secure tightening even in confined spaces, reducing the risk of tool slippage. With a coarse thread pitch of 1.25mm, it ensures fast installation and high vibration resistance, ideal for automation equipment, conveyor systems, and precision instruments where reliable shoulder positioning is essential.

Specification Summary & Compliance

This precision metric shoulder screw adheres to standard thread specifications with Class 5g6g thread fit and a shoulder diameter tolerance of -0.04 to -0.01 mm. It is manufactured to ensure consistent thread length of 13mm and shoulder length of 18mm (tolerance 0 to 0.25 mm). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances and safe for industrial use.