S-91273A377 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ensuring long-term reliability in harsh or humid environments.
• Precise alignment and pivot function with a 45mm shoulder and controlled diameter tolerance, reducing wear and simplifying assembly.
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness, providing dependable load-bearing capacity.
• Secure, non-slip installation thanks to the knurled head and 2mm hex socket drive, allowing for high-torque tightening.
• Accurate and reliable threading with Class 5g6g fit and coarse M4 x 0.7mm pitch, ensuring consistent engagement and vibration resistance.
• Environmental and regulatory compliance with RoHS 3 and REACH standards, making it safe for various industrial applications.
• Durability under shear stress with a minimum 35,000 psi shear strength, ideal for dynamic mechanical assemblies.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address common challenges in precision assemblies, such as misalignment and component wear. The 45mm shoulder length acts as a precise locating dowel or pivot, maintaining accurate part positioning in machinery, automotive, and electronics. Made from 18-8 stainless steel, it offers excellent corrosion resistance, which is critical in environments exposed to moisture or chemicals. The hex socket drive and knurled head enhance grip during installation, preventing tool slippage and enabling high clamping force. With a Class 5g6g thread fit and coarse pitch, it ensures quick assembly and reliable performance in vibrating applications, reducing maintenance needs and improving operational lifespan.

Specification Summary & Compliance

This shoulder screw features an M4 x 0.7mm coarse metric thread with a Class 5g6g tolerance for precise fit. The shoulder diameter is 4 mm with a tolerance of -0.04 to -0.01 mm, and the shoulder length is 45 mm with a 0 to 0.25 mm tolerance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.