S-91375A471 3/4"-16 x 2 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Superior torque transmission and anti-tampering via the headless design and 3/8" hex drive, ensuring secure installations.
• Precise and reliable thread engagement with Class 3A UNF fine threads, minimizing the risk of loosening under vibration.
• High-strength and durability from Rockwell C45 hardened alloy steel, capable of withstanding heavy loads and repeated use.
• Secure, non-slip fastening thanks to the cup tip design, which bites into surfaces for a firm grip.
• Broad industry compliance including ASME B18.3 and ASTM F912, ensuring consistent quality and interchangeability.
• Environmental and safety adherence with RoHS 3 and REACH compliance, meeting global regulatory 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 corrosion-induced failure. The Class 3A UNF fine threads provide a tighter fit and higher fatigue resistance, ideal for applications subject to vibration or dynamic loads. With a Rockwell C45 hardness and cup tip, it delivers exceptional clamping force without damaging shafts or hubs, making it perfect for securing gears, pulleys, and collars in machinery, automotive, and heavy equipment. The headless design and 3/8" hex drive allow for flush mounting and high-torque installation in confined spaces, while the black-oxide finish offers added protection against rust in humid or outdoor settings. This combination of precision threading, high-strength material, and corrosion resistance ensures long-term reliability in demanding engineering environments.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit per UNF standards, ensuring precise dimensional accuracy and interchangeability. It meets ASME B18.3 and ASTM F912 specifications for consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in restricted substance-sensitive applications.