S-90289A535 1/4"-20 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
- Enhanced corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
- Superior holding power from Class 3A thread fit and coarse UNC thread, ensuring a tight, secure, and vibration-resistant connection.
- High-strength durability provided by alloy steel with Rockwell C45 hardness, resisting wear and deformation under heavy loads.
- Secure anti-rotation locking via serrations, preventing unintended loosening in high-vibration applications.
- Easy installation and removal with a 1/8" hex drive and headless design, ideal for confined spaces and flush mounting.
- Reliable surface contact from the cup tip, minimizing component damage while maintaining strong clamping force.
- Broad compatibility with right-hand UNC coarse threads, fitting standard 1/4"-20 components across various machinery.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address critical challenges in industrial assembly, such as vibration-induced loosening and component misalignment. The Class 3A UNC coarse thread provides precise, high-tolerance engagement, reducing the risk of cross-threading and ensuring repeatable fastening in automated production lines. Its headless design with hex drive allows for flush installation in pulleys, gears, and collars, while the serrations enhance locking security on shafts and rotating parts. The cup tip concentrates pressure without marring surfaces, making it ideal for precision equipment, automotive systems, and heavy machinery where reliability and minimal maintenance are paramount.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for superior dimensional accuracy and a UNC coarse thread (1/4"-20) for rapid assembly. It is manufactured from alloy steel with a Rockwell C45 hardness and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence for global industrial use.
