S-92505A534 1/4"-20 x 5/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit ensuring tight, reliable fastening in demanding applications
• Enhanced corrosion resistance provided by the black oxide finish on alloy steel, extending service life in harsh environments
• High-strength durability with Rockwell C45 hardness, resisting wear and deformation under heavy loads
• Precise component positioning enabled by the extended tip design, improving alignment and reducing slippage
• Easy installation and removal with the 1/8" hex drive, allowing efficient maintenance with standard tools
• Broad industrial compatibility due to UNC coarse threading and ASME B18.3 compliance, ensuring interchangeability
• Environmental regulation compliance meeting RoHS 3 and REACH standards, suitable for global supply chains

Professional Applications & Engineering Value

This 1/4-20 UNC set screw is engineered to solve critical fastening challenges in industrial machinery, automotive assemblies, and precision equipment. The black oxide alloy steel construction provides exceptional resistance to rust and oxidation, while the Class 3A thread fit guarantees minimal backlash and vibration loosening in high-stress applications. The extended tip design ensures positive engagement with shaft keyways and collars, preventing component drift and maintaining precise alignment. With its headless configuration and right-hand thread, it offers flush mounting in confined spaces where protruding fasteners are impractical. Ideal for securing gears, pulleys, and couplings, this hex drive set screw delivers reliable performance in manufacturing, maintenance, and assembly operations requiring repeatable precision.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise dimensional accuracy. It maintains a thread diameter of 0.25" and length of 5/16", with an extended tip diameter of 0.156" and length of 0.067" within specified tolerances. Manufactured to ASME B18.3 specifications and hardened to Rockwell C45, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in restricted substance-controlled industries.