S-91273A381 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Precise component alignment and smooth rotation thanks to the 70mm shoulder with a controlled diameter tolerance for reliable bearing surfaces.
• High-strength performance with a tensile strength of 70,000 psi and a shear strength of 35,000 psi, ensuring joint integrity under load.
• Secure and easy installation using a standard 2 mm hex socket drive and a knurled head for improved grip and torque application.
• Accurate and reliable threading with a Class 5g6g fit M4 x 0.7mm coarse thread, providing consistent engagement and vibration resistance.
• Enhanced durability and hardness rated at Rockwell B55, resisting wear and deformation in demanding mechanical applications.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address critical alignment and pivot point requirements in assemblies. The 70mm shoulder length provides a precise bearing surface, eliminating the need for separate spacers or bushings and reducing assembly time and parts count. Manufactured from 18-8 stainless steel, it offers excellent resistance to corrosion and oxidation, making it suitable for applications in food processing, packaging machinery, and automated systems exposed to moisture. The hex socket drive and knurled head texture ensure secure tool engagement, preventing cam-out and allowing for high torque installation in confined spaces. Its Class 5g6g thread with a 0.7mm coarse pitch ensures quick assembly and reliable fastening in high-vibration environments, providing long-term operational stability and reducing maintenance needs.

Specification Summary & Compliance

This precision shoulder screw features an M4 x 0.7mm coarse metric thread with a Class 5g6g tolerance for consistent fit. The shoulder diameter is 4 mm with a tolerance of -0.04 to -0.01 mm, and the shoulder length is 70 mm with a tolerance of 0 to 0.25 mm, ensuring high dimensional accuracy. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.