S-91385A537 1/4"-20 x 1/2" 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
- Permanent vibration resistance with nylon patch thread locking that maintains secure fastening in high-stress environments
- Exceptional temperature tolerance from -50°F to 250°F, ensuring reliable performance in extreme operating conditions
- Superior material strength from Black-Oxide Alloy Steel with Rockwell C45 hardness for enhanced durability and wear resistance
- Precise thread engagement with UNC Class 3A coarse threads providing optimal fit and reduced cross-threading risks
- Secure cup point design that bites into mating surfaces for positive locking and minimal slippage
- Headless hex drive configuration with 1/8" drive for flush installation in space-constrained applications
- Comprehensive compliance with ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel set screw delivers critical engineering solutions for industrial applications where vibration resistance and thermal stability are paramount. The nylon patch locking mechanism creates a permanent bond that prevents loosening under continuous stress, making it ideal for machinery, automotive assemblies, and precision equipment. The cup point design provides superior biting action into shafts and collars, ensuring positive positioning without damaging components. With UNC coarse threads and Class 3A fit, installation is streamlined while maintaining precise tolerances. The headless configuration with 1/8" hex drive enables flush mounting in confined spaces, while the black-oxide surface treatment enhances corrosion resistance in demanding environments.
Specification Summary & Compliance
This set screw features 1/4"-20 UNC coarse threads with Class 3A fit for precision engagement, manufactured to ASME B18.3 specifications where applicable. The component maintains dimensional accuracy per inch system requirements with 1/2" length and 0.25" thread diameter. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring adherence to international regulatory requirements for industrial fasteners.
