S-91375A569 1/4"-28 x 4" 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
- Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
- Exceptional mechanical strength from Rockwell C45 hardened alloy steel, preventing deformation under heavy loads
- Precise thread engagement with Class 3A fit and UNF fine threads, ensuring vibration-resistant secure fastening
- Space-saving headless design with 1/8" hex drive, ideal for applications with limited clearance
- Enhanced grip and positioning from cup tip design, minimizing component slippage during installation
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
- Optimized for right-hand threading with 4" length, providing extended reach for deep assembly applications
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications requiring precision fastening and long-term reliability. The combination of Rockwell C45 hardness and Class 3A UNF fine threads addresses common vibration-induced loosening issues in machinery, automotive, and manufacturing equipment. The headless hex drive design with 1/8" drive size enables installation in confined spaces while maintaining high torque capability. The cup tip configuration provides superior biting action on shaft surfaces, preventing rotational slippage in power transmission components. These features make it particularly valuable for permanent positioning applications where corrosion resistance and mechanical integrity are paramount.
Specification Summary & Compliance
This 1/4"-28 UNF set screw features precision Class 3A thread fit with fine thread spacing and right-hand thread direction. Manufactured to ASME B18.3 specifications with ASTM F912 compliance, ensuring dimensional accuracy and performance reliability. The 4" length and 0.25" thread diameter maintain strict industrial tolerances. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees suitability for international markets and sensitive applications.
