S-91375A159 3-56 x 3/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide finish, ideal for harsh industrial environments
• Exceptional thread precision with Class 3A UNF fine threads ensuring secure, vibration-resistant fastening
• High-strength durability from Rockwell C45 hardened Alloy Steel for long-term reliability
• Secure installation with 0.050" hex drive preventing tool slippage and damage
• Effective surface contact through cup tip design for improved grip and alignment
• Space-saving headless construction allowing flush mounting in compact assemblies
• Regulatory compliance meeting ASME B18.3 standards and environmental regulations

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel set screw delivers critical performance in precision assemblies where space constraints and vibration resistance are paramount. The 3-56 UNF Class 3A fine threads provide superior holding power in soft materials and tight-tolerance applications, while the cup tip design creates concentrated point contact that prevents component slippage. Engineered for industrial machinery, automotive components, and electronic enclosures, the headless configuration enables flush mounting in recessed locations. The Rockwell C45 hardness ensures the fastener maintains its structural integrity under repeated adjustments and high-stress conditions, making it an ideal solution for permanent positioning applications requiring reliable, long-term performance.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision applications. Features 3-56 UNF fine threads with right-hand direction and 3/16" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch system measurement ensures compatibility with North American industrial standards and equipment.