S-91375A101 4-40 x 1/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating on alloy steel, ideal for harsh industrial environments
• Superior holding power due to Rockwell C45 hardness, preventing deformation under high torque
• Secure, slip-resistant installation with hex drive design ensuring reliable tool engagement
• Precise thread engagement with Class 3A fit for minimal backlash and vibration resistance
• Effective point contact from cup tip design, distributing pressure evenly on shafts or components
• Broad regulatory compliance including RoHS 3 and REACH, ensuring safe use in global markets
• Compact headless profile allowing flush mounting in space-constrained assemblies

Professional Applications & Engineering Value

This 4-40 UNC set screw in black-oxide alloy steel addresses critical challenges in precision assemblies where space and reliability are paramount. The headless design and compact 1/16" length enable seamless integration into tight mechanical systems, while the hex drive ensures consistent torque application without cam-out. Its Class 3A thread fit and coarse thread spacing provide rapid installation and robust clamping force, reducing the risk of loosening in high-vibration applications like robotics, automotive components, and electronic enclosures. The cup tip creates a concentrated bearing surface, minimizing damage to shafts and improving repeatability in adjustment mechanisms.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with UNC coarse threads and Class 3A thread fit for precise dimensional accuracy. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.