S-92505A537 1/4"-20 x 1/2" 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 from the black oxide finish, extending service life in industrial environments
• High-strength durability provided by alloy steel with Rockwell C45 hardness, resisting wear and deformation
• Secure installation and removal via the 1/8" hex drive, allowing high torque application without head interference
• Improved component engagement thanks to the extended tip design, offering deeper penetration and reduced loosening
• Broad compatibility with UNC coarse 1/4"-20 threads, fitting standard components for versatile use
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-conscious sourcing

Professional Applications & Engineering Value

This 1/4-20 UNC set screw is engineered to address common industrial challenges like vibration-induced loosening and component slippage in machinery, automotive, and assembly systems. The black oxide alloy steel construction provides a robust barrier against rust, while the Rockwell C45 hardness ensures the screw maintains its integrity under high stress. The hex headless design with a 1/8" drive allows for flush mounting in confined spaces, and the extended tip enhances grip on shafts or collars, preventing rotational movement. Its coarse UNC threads and Class 3A fit deliver precise, repeatable fastening, making it ideal for permanent or semi-permanent installations where reliability is critical. By integrating these features, this set screw reduces maintenance needs and improves overall system longevity in industrial applications.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit for high precision and consistent performance, with UNC coarse threading (1/4"-20) per standard specifications. It is manufactured in compliance with ASME B18.3 and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material quality. Dimensions include a 1/2" length, 0.25" thread diameter, and extended tip with controlled tolerances (e.g., tip diameter: 0.156" with -0.007" to 0 tolerance), supporting reliable integration in engineered assemblies.