S-90152A112 4-40 x 5/16" ASME B18.3, ASTM F837 Stainless Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Precise Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening
• Easy installation and removal using a standard 3/32" hex drive for efficient assembly operations
• Full thread engagement along the entire 5/16" length provides consistent clamping force
• Compliance with ASME B18.3 standards guarantees dimensional accuracy and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH for safe use in regulated industries

Professional Applications & Engineering Value

This 4-40 UNC Socket Head Cap Screw delivers exceptional engineering value in demanding applications where corrosion resistance and mechanical reliability are critical. The 18-8 stainless steel construction provides excellent protection against rust and chemical exposure, making it ideal for machinery, automotive components, and electronic enclosures operating in corrosive environments. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of vibration-induced loosening while maintaining consistent clamping force. With its 3/32" hex drive and standard socket head profile, installers benefit from superior torque transmission during assembly, minimizing tool slippage and potential damage to the fastener. These characteristics make this fully threaded screw particularly valuable in precision equipment manufacturing, where dimensional stability and repeatable performance are essential for operational safety and longevity.

Specification Summary & Compliance

This socket head cap screw features 4-40 UNC coarse threads with Class 3A fit for precision engagement, manufactured to ASME B18.3 dimensional standards. The fastener maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for use in regulated industries. With a Rockwell B70 hardness rating and 80,000 psi tensile strength, this inch-system fastener delivers consistent mechanical performance across industrial applications.