S-92991A128 1/4"-28 x 3/8" ASME B18.3 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 brass material, ideal for harsh environments and reducing maintenance costs.
- Exceptional thread precision with Class 3A fit for reliable, vibration-resistant assemblies and minimal backlash.
- Secure, non-slip fastening thanks to the cup point design that bites into shafts for permanent positioning.
- Easy installation in confined spaces with a compact, headless body and 1/8" hex drive for straightforward tool access.
- Enhanced durability from Rockwell B55 hardness, providing excellent wear resistance and long service life.
- Wide industry compatibility with 1/4"-28 UNF fine threads, ensuring seamless integration into various mechanical systems.
- Compliance with global standards including ASME B18.3, RoHS 3, and REACH for safe, reliable use in regulated applications.
Professional Applications & Engineering Value
This brass set screw is engineered to address common industrial challenges like corrosion, vibration loosening, and space constraints. The Class 3A UNF fine threads deliver tight tolerances, minimizing play in precision assemblies such as machinery, automotive components, and electronic devices. Its headless design with a 1/8" hex drive allows for easy installation in tight areas, while the cup point ensures a firm grip on shafts or gears, preventing slippage under dynamic loads. Made from corrosion-resistant brass, it excels in moist or chemical-exposed environments, reducing downtime and replacement needs. Ideal for securing collars, pulleys, and knobs, this screw enhances reliability in industrial fastening applications where durability and compliance are critical.
Specification Summary & Compliance
This set screw features a 1/4"-28 UNF fine thread with Class 3A fit for high precision and right-hand direction. Dimensions include a 3/8" length and 1/8" hex drive, with a cup point tip and Rockwell B55 hardness. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence.
