S-91375A579 1/4"-20 x 4" ASME B18.3, ASTM F912 Set Screws
Set Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide finish, extending service life in demanding industrial environments.
- Exceptional holding power from Rockwell C45 hardened alloy steel, resisting wear and deformation under high stress.
- Precise, secure fastening with Class 3A thread fit, minimizing backlash and ensuring reliable assembly in critical applications.
- High-torque installation capability via 1/8" hex drive, allowing for easy tightening even in confined spaces with standard tools.
- Enhanced grip and minimal component damage thanks to the cup tip design, which concentrates pressure for a firm hold on shafts or collars.
- Wide compatibility and easy sourcing with UNC coarse threads, conforming to common North American industrial standards.
- Compliance with global environmental and safety regulations including RoHS 3 and REACH, ensuring responsible manufacturing and use.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address common industrial challenges such as slippage, corrosion, and assembly inefficiency. Its headless hex design and UNC coarse thread enable flush mounting and quick installation in tight spaces, ideal for securing pulleys, gears, and knobs on rotating shafts. The Rockwell C45 hardness and Class 3A thread fit provide consistent clamping force, reducing maintenance needs in machinery, automotive, and heavy equipment. The cup tip bites firmly into surfaces, preventing loosening from vibrations, while the black-oxide coating offers added protection against rust in humid or outdoor settings. Built to meet ASME B18.3 specifications, it delivers reliable performance for OEMs and MRO applications requiring durable, precision fasteners.
Specification Summary & Compliance
This set screw adheres to Class 3A thread tolerances for precise fit, with UNC 1/4"-20 coarse threads and right-hand direction. It meets ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
