S-95446A631 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 360 Brass construction, ideal for harsh industrial environments and electrical applications
• Precise component alignment with 1/8" shoulder diameter and tight tolerance fit, reducing assembly errors and improving mechanical stability
• High-strength performance with 40,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable load-bearing capacity
• Easy installation and removal with 5/64" hex socket drive, providing secure tool engagement and reducing stripping risks
• Consistent thread engagement with Class 2A UNC coarse threads, offering vibration resistance and faster assembly in production lines
• Regulatory compliance assurance with RoHS 3 and REACH standards, meeting global environmental and safety requirements
• Durable shoulder design with precise length tolerances, maintaining dimensional accuracy for rotating parts and pivoting mechanisms

Professional Applications & Engineering Value

This 360 Brass shoulder screw delivers critical engineering value in precision assemblies where corrosion resistance and electrical conductivity are paramount. The UNC coarse thread with Class 2A fit ensures rapid installation in automated manufacturing while maintaining vibration resistance in dynamic applications. The hex socket drive provides superior torque transmission compared to standard drives, reducing fastener failure in high-cycle production environments. Engineers specify this component for precision pivots, rotational mechanisms, and electrical grounding applications where the precise shoulder diameter acts as a reliable locating surface for bearings, gears, and moving components. The combination of brass material properties and tight tolerance control solves common challenges with galvanic corrosion, component misalignment, and assembly efficiency in industrial equipment.

Specification Summary & Compliance

This shoulder screw maintains Class 2A thread fit per UNC standards with precise shoulder diameter tolerance of -0.002" to 0" and shoulder length tolerance of 0" to 0.003". Manufacturing complies with RoHS 3 (2015/863/EU) with exemption 6(c) for lead in copper alloy and REACH (EC 1907/2006) compliance. The 4-40 UNC coarse thread with 5/32" thread length and right-hand thread direction ensures compatibility with standard industrial components and assembly processes.