S-91375A577 5/16"-18 x 7/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Exceptional thread precision with Class 3A fit ensuring tight, secure fastening without cross-threading issues
• High-strength performance backed by Rockwell C45 hardness rating for reliable load-bearing capability
• Optimized installation efficiency with 5/32" hex drive allowing quick, secure tool engagement in confined spaces
• Secure component positioning through cup tip design that creates positive locking action on shafts and collars
• Reliable coarse thread engagement with UNC 5/16"-18 threads providing rapid installation in various materials
• Headless design advantage enabling flush mounting where protruding fasteners are not permissible

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications where vibration resistance and positional security are paramount. The Class 3A thread fit combined with UNC coarse threads ensures rapid, precise installation in machinery components, power transmission systems, and assembly fixtures. The headless configuration with hex drive allows installation in tight spaces where conventional fasteners cannot be accommodated, while the cup tip creates superior biting action on shafts and rotating components. Engineered to withstand high torque applications, this 5/16"-18 set screw maintains clamping force under continuous vibration, making it ideal for manufacturing equipment, automotive assemblies, and heavy machinery where reliable fastening performance cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit precision and UNC 5/16"-18 coarse threads. The black-oxide alloy steel construction delivers consistent performance with Rockwell C45 hardness rating. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards ensures safe use across regulated industries. Thread diameter maintains precise 0.313" dimension with 7/16" length for standardized application requirements.