S-90289A352 1/4"-28 x 5/16" 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 black-oxide alloy steel coating, extending service life in harsh industrial environments.
- Precise, vibration-resistant locking achieved through serrations and fine UNF threads, maintaining secure positioning under dynamic loads.
- High-strength durability with Rockwell C45 hardness, ensuring reliable performance in high-stress applications.
- Easy installation and removal using the 1/8" hex drive, allowing efficient assembly in confined spaces.
- Secure, non-marring fastening with the cup tip design, distributing pressure evenly to protect component surfaces.
- Exceptional thread accuracy with Class 3A fit, providing tight tolerances for leak-proof and precise assemblies.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address common industrial challenges such as component slippage, corrosion-induced failure, and assembly inefficiency. The headless design with hex drive enables flush mounting in tight spaces, while the fine UNF threads and Class 3A fit deliver superior holding power against vibrations in machinery, automotive, and precision equipment. The cup tip minimizes surface damage on shafts or collars, and the Rockwell C45 hardness ensures long-term reliability under repetitive stress. Ideal for securing gears, pulleys, and knobs, this screw provides a dependable, RoHS and REACH compliant solution for demanding engineering applications.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 specifications, with precise 1/4"-28 UNF fine threads and Class 3A thread fit for high accuracy. It features a length of 5/16", 1/8" hex drive, and right-hand thread direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.
