S-91375A514 1"-8 x 2 3/4" 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 holding power from Class 3A thread fit ensuring tighter tolerances and more secure fastening than standard Class 2A alternatives
• High-strength performance with Rockwell C45 hardness providing reliable resistance to deformation under heavy loads
• Easy installation and removal using the 9/16" hex drive that accommodates standard tools while preventing cam-out
• Optimized for high-vibration applications with coarse UNC thread spacing that maintains grip better than fine threads
• Secure positioning capability thanks to the cup tip design that creates positive engagement with mating surfaces
• Space-saving headless design allowing flush mounting where protruding fasteners aren't feasible

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for demanding industrial applications where vibration resistance and precise component positioning are paramount. The 1"-8 UNC Class 3A threads with coarse spacing provide superior holding strength in high-torque scenarios, while the Rockwell C45 hardness ensures the fastener maintains its structural integrity under repeated stress cycles. The headless design with hex drive enables installation in confined spaces where traditional headed fasteners cannot fit, making it ideal for machinery assemblies, power transmission systems, and precision equipment requiring secure shaft collars, gears, and pulleys. The black-oxide surface treatment offers enhanced corrosion protection without significantly altering dimensions, maintaining the precise thread fit critical for reliable performance in manufacturing, automotive, and heavy equipment applications.

Specification Summary & Compliance

This set screw features precision 1"-8 UNC Class 3A threads with coarse spacing, manufactured to exacting dimensional standards. The fastener complies with ASME B18.3 specifications and meets ASTM F912 material requirements, ensuring consistent quality and performance. Environmental compliance is confirmed through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, making it suitable for regulated industries and international markets.