S-91381A357 1/4"-28 x 1/2" 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 on alloy steel, extending service life in harsh industrial environments
- Precise thread engagement with Class 3A fit and UNF fine spacing ensuring vibration-resistant, reliable fastening
- Enhanced component protection through soft brass tip that prevents damage to mating surfaces during installation
- Optimized torque transmission with 1/8" hex drive design allowing secure installation in confined spaces
- Exceptional mechanical strength from Rockwell C28 hardness alloy steel, maintaining integrity under heavy loads
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial applications
- Space-saving headless design enabling flush mounting where protruding fasteners are impractical
Professional Applications & Engineering Value
This black-oxide alloy steel set screw with brass tip addresses critical challenges in precision assembly applications. The UNF fine thread spacing combined with Class 3A thread fit delivers exceptional vibration resistance in machinery, automotive components, and precision instruments. The soft brass tip protects expensive shafts and gears from marring while maintaining secure positioning. The headless design with hex drive enables installation in confined spaces where traditional fasteners cannot be used. Engineered for industrial applications requiring repeated adjustments, the combination of Rockwell C28 hardness and corrosion-resistant coating ensures long-term reliability in demanding environments without compromising disassembly capability.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with Class 3A thread fit precision and UNF fine thread spacing (1/4"-28). Features include 1/2" length, right-hand thread direction, and 1/8" hex drive. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide alloy steel construction provides consistent performance while meeting industrial specifications for dimensional accuracy and material properties.
