S-91273A351 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and washdown applications
• Precise alignment and smooth rotation ensured by the 4mm diameter shoulder with tight diameter tolerance (-0.04 to -0.01 mm)
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding mechanical assemblies
• Secure, non-slip fastening with a knurled head texture and 2mm hex socket drive for reliable torque application
• Consistent thread engagement with Class 5g6g thread fit and M4 x 0.7mm coarse thread for quick assembly and vibration resistance
• Durable, long-lasting operation backed by Rockwell B55 hardness, providing excellent wear resistance
• Global regulatory compliance meeting RoHS 3 and REACH standards for safe use in international markets

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 corrosion resistance, making it suitable for food processing, medical devices, and outdoor equipment where moisture exposure is a concern. The hex socket drive and knurled head ensure secure tool engagement, preventing cam-out during high-torque installation. With its Class 5g6g thread fit and precisely machined shoulder, this fastener maintains component alignment in rotating mechanisms, linkages, and bearing mounts while resisting loosening under vibration. The coarse thread pitch enables rapid assembly in production environments, reducing installation time without compromising joint integrity.

Specification Summary & Compliance

This precision metric shoulder screw features M4 x 0.7mm coarse threads with Class 5g6g thread fit per ISO standards. The shoulder diameter maintains tight tolerance of -0.04 to -0.01 mm with shoulder length tolerance of 0 to 0.25 mm. 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) environmental regulations.