S-91273A373 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise component alignment and pivot function enabled by the 25mm shoulder with a tightly controlled diameter tolerance of -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 applications.
• Secure, non-slip installation with a knurled socket head and 2mm hex drive, preventing tool slippage and ensuring proper torque application.
• Reliable thread engagement with a Class 5g6g thread fit and coarse 0.7mm pitch for quick assembly and vibration resistance.
• Consistent hardness and durability with a Rockwell B55 rating, maintaining structural integrity under repeated loads.
• Global regulatory compliance with RoHS 3 and REACH, ensuring material safety and suitability for international markets.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to solve critical alignment and pivot challenges in industrial applications. The precision-machined 25mm shoulder length acts as a built-in spacer or bearing surface, eliminating the need for additional components and reducing assembly time in machinery, automation systems, and precision instruments. Manufactured from 18-8 Stainless Steel, it offers excellent resistance to rust and corrosion, which is vital for equipment exposed to moisture or chemicals. The knurled socket head with a 2mm hex drive provides a positive grip for secure installation, even in confined spaces. The Class 5g6g thread fit and coarse 0.7mm pitch ensure robust fastening that is less prone to loosening from vibrations, making it a reliable choice for high-stress environments where performance cannot be compromised.

Specification Summary & Compliance

This metric shoulder screw features an M4 x 0.7mm coarse thread with a Class 5g6g thread fit, ensuring dimensional accuracy per metric standards. The shoulder diameter is held to a tight tolerance of -0.04 to -0.01 mm, and the shoulder length tolerance is 0 to +0.25 mm. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of restricted hazardous substances and suitable for use in regulated industries.