S-92505A542 1/4"-20 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for precise, vibration-resistant connections in demanding applications.
• Exceptional durability and corrosion resistance from the Black Oxide finish on Alloy Steel, extending service life in harsh environments.
• High-strength performance backed by Rockwell C45 hardness, ensuring the screw withstands high torque and stress without stripping.
• Secure and easy installation with a 1/8" hex drive, allowing for high torque application in confined spaces without a protruding head.
• Enhanced grip and positioning due to the extended tip design (0.156" diameter), which bites into materials for a more secure fastening.
• Reliable coarse threading (UNC) for quicker assembly and reduced cross-threading risk in industrial settings.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 1/4"-20 UNC set screw is engineered to solve critical fastening challenges in machinery, automotive, and aerospace sectors. The Black Oxide Alloy Steel construction provides excellent wear and corrosion resistance, reducing maintenance needs in humid or abrasive conditions. Its headless design with a hex drive enables flush mounting in tight spaces, preventing interference with moving parts. The extended tip ensures a firm bite into shafts and collars, minimizing slippage under vibration—a common issue in dynamic assemblies. By incorporating a coarse thread and Class 3A fit, it offers rapid installation and high reliability, making it ideal for securing gears, pulleys, and other components where precision and strength are paramount.

Specification Summary & Compliance

This set screw adheres to Class 3A thread tolerances for high precision, with a 1/4"-20 UNC coarse thread and right-hand direction. It meets ASME B18.3 specifications for dimensional accuracy and is manufactured from Alloy Steel with a Rockwell C45 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances and suitable for global industrial use.