S-91273A375 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh or washdown environments.
• Precise component alignment ensured by a 35mm shoulder with controlled diameter tolerance for reduced assembly play.
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing applications.
• Secure, non-slip installation via the knurled hex socket head, preventing driver slippage and tool damage.
• Consistent thread engagement with Class 5g6g thread fit and coarse 0.7mm pitch for faster assembly and vibration resistance.
• Durable, long-lasting finish and material hardness (Rockwell B55) resist wear, galling, and deformation.
• Compliant with global regulations including RoHS 3 and REACH, ensuring environmental and safety standards are met.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to solve critical alignment and mounting challenges in precision assemblies. The 35mm shoulder length acts as a precise pivot or spacer, eliminating the need for additional bushings in machinery, robotics, and electronic enclosures. Made from 18-8 stainless steel, it resists oxidation and chemical exposure, making it suitable for food processing, medical devices, and outdoor equipment. The hex socket drive with knurling ensures high torque application without cam-out, while the coarse thread and Class 5g6g fit provide quick, secure fastening even in vibrating environments. This combination of material durability, dimensional accuracy, and thread reliability reduces maintenance downtime and improves assembly integrity.

Specification Summary & Compliance

This metric shoulder screw features M4 x 0.7mm coarse threads with Class 5g6g thread fit per ISO standards. The shoulder diameter tolerance is -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm for precise fits. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted substances. Manufactured to deliver consistent Rockwell B55 hardness and 70,000 psi tensile strength, it meets industrial demands for strength and repeatability.