S-90289A353 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 Black-Oxide coating, extending service life in harsh industrial environments.
- Maximum holding power and minimal surface damage due to the cup tip design, ensuring secure fastening without slipping.
- Precise thread engagement with Class 3A fit for high-strength, vibration-resistant assemblies in critical applications.
- High-strength durability from alloy steel and Rockwell C45 hardness, providing reliable performance under heavy loads.
- Easy installation and removal with the 1/8" hex drive and headless design, saving time in tight spaces.
- Fine thread spacing for improved adjustment accuracy and better load distribution in precision assemblies.
- Compliance with industry standards including ASME B18.3, RoHS, and REACH, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This 1/4"-28 UNF Class 3A set screw is engineered to address common industrial challenges like vibration loosening and corrosion in machinery, automotive, and aerospace components. Made from black-oxide alloy steel, it offers enhanced resistance to rust and wear, while the cup tip design grips firmly into surfaces without causing excessive damage. The fine thread and Class 3A fit ensure tight tolerances for high-stress applications, reducing maintenance needs and improving assembly reliability. Ideal for securing gears, pulleys, and shafts, this headless hex set screw provides a flush finish and easy access in confined spaces, supporting efficient B2B procurement for durable fastening solutions.
Specification Summary & Compliance
This set screw features a 1/4"-28 UNF fine thread with Class 3A thread fit for precise dimensional accuracy, and includes a right-hand thread direction, 3/8" length, and 1/8" hex drive. It complies with ASME B18.3 specifications for set screws, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
