S-91375A198 8-32 x 7/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Maximum holding power with Class 3A thread fit for secure, vibration-resistant connections in demanding applications
• Superior corrosion resistance thanks to black-oxide coating on alloy steel, extending service life in harsh industrial environments
• Exceptional durability from Rockwell C45 hardness, maintaining thread integrity under repeated installation and high-stress conditions
• Precise torque transmission via 5/64" hex drive, preventing tool slippage and ensuring consistent fastening performance
• Deep penetration capability with cup point design that bites into mating surfaces for superior anti-loosening performance
• Reliable coarse threading with UNC 8-32 specification for quick assembly and reduced cross-threading risks
• Space-saving headless design allowing flush mounting where clearance is limited without compromising strength

Professional Applications & Engineering Value

This 8-32 UNC set screw delivers critical engineering solutions for industrial applications requiring permanent positioning and torque transmission. The black-oxide alloy steel construction provides essential corrosion protection while maintaining the Rockwell C45 hardness needed to withstand vibrational stresses in machinery, automotive components, and power transmission systems. The cup point tip creates positive seating in shafts, collars, and pulleys, preventing rotational slippage that compromises assembly integrity. With coarse UNC threading and Class 3A fit, installation is streamlined while maintaining precision alignment in high-volume manufacturing environments. The headless design with hex drive enables installation in confined spaces where traditional fasteners cannot operate, making it ideal for precision equipment, robotics, and permanent mechanical joints.

Specification Summary & Compliance

This set screw meets ASME B18.3 specifications (ASTM F912) with precise 8-32 UNC coarse threads manufactured to Class 3A thread fit tolerances for superior engagement. The 7/8" length provides optimal fastening depth while maintaining dimensional consistency. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety standards are met for global industrial applications.