S-91375A683 7/16"-20 x 5/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust and extends service life in harsh industrial environments
• Exceptional thread precision with Class 3A fit ensuring tight, secure fastening without cross-threading or loosening under vibration
• High-strength performance from alloy steel with Rockwell C45 hardness for reliable load-bearing capacity in demanding applications
• Optimized torque transmission through hex drive design allowing easy installation with standard tools while preventing cam-out
• Secure component positioning with cup tip design that creates positive engagement and prevents slippage on shaft surfaces
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
• Space-saving headless design enabling flush mounting where protruding fastener heads are not permissible

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial machinery, automotive components, and precision equipment. The 7/16"-20 UNF fine threads with Class 3A precision fit eliminate backlash in assemblies subject to vibration, while the Rockwell C45 hardness ensures dimensional stability under heavy loads. The headless hex drive configuration provides maximum torque capability in confined spaces, and the cup tip creates permanent seating on shafts and collars. Ideal for securing gears, pulleys, and couplings where reliability is paramount, this fastener combines corrosion-resistant surface treatment with exceptional mechanical properties for long-term performance in demanding environments.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with UNF Class 3A thread fit ensuring precise dimensional accuracy. The black-oxide alloy steel construction provides consistent performance with Rockwell C45 hardness rating. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming adherence to international safety and substance restriction requirements for industrial applications.