S-91375A532 1/4"-20 x 3/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for reliable, vibration-resistant fastening in demanding applications
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in various industrial environments
• High-strength durability with Rockwell C45 hardness, preventing deformation under high torque and load conditions
• Secure, non-slip installation via the 1/8" hex drive, allowing for precise torque application in confined spaces
• Enhanced grip and minimal surface damage from the cup point design, ideal for permanent positioning on shafts and collars
• Wide compatibility with 1/4"-20 UNC coarse threads, ensuring easy assembly and replacement in standard components
• Regulatory peace of mind with compliance to RoHS 3 and REACH, meeting international environmental and safety standards

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address critical challenges in industrial assembly, such as component slippage and fastener failure under stress. The headless design with hex drive allows for flush mounting in tight spaces, while the cup point bites securely into materials without excessive marring, making it ideal for securing pulleys, gears, and knobs on rotating shafts. Its UNC coarse thread and Class 3A fit provide quick installation and high resistance to loosening in high-vibration environments like machinery and automotive systems. The Rockwell C45 hardness ensures the screw maintains its integrity during repeated adjustments, reducing maintenance needs and downtime in production lines.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with precise UNC 1/4"-20 coarse threads and a Class 3A thread fit for tight tolerances and consistent performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances and suitable for global industrial use. The dimensions include a thread diameter of 0.25" and a length of 3/16", with a right-hand thread direction for standard applications.