S-91385A534 1/4"-20 x 5/16" 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 locker that maintains secure locking from -50°F to 250°F
- Superior wear resistance through black-oxide coated alloy steel construction with Rockwell C45 hardness
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in high-vibration applications
- Space-saving installation using headless design with hex drive for compact assemblies and easy access
- Enhanced grip performance through cup tip design that digs into mating surfaces without slipping
- Industry-standard compatibility meeting ASME B18.3 and ASTM F912 specifications for reliable performance
- Environmental compliance with RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional performance in demanding industrial environments where vibration loosening compromises assembly integrity. The permanent nylon patch thread locker chemically bonds to mating threads, creating a reliable seal that withstands temperature fluctuations from -50°F to 250°F. Engineered with Class 3A UNC coarse threads, this headless set screw provides superior thread engagement in soft materials and high-vibration applications like machinery, automotive components, and power transmission systems. The cup tip design concentrates pressure for maximum holding power while the hex drive enables precise torque application in confined spaces. These industrial set screws solve critical fastening challenges where permanent, vibration-resistant locking is essential for operational safety and reduced maintenance.
Specification Summary & Compliance
This set screw features 1/4"-20 UNC Class 3A threads with coarse spacing for optimal engagement. Manufacturing complies with ASME B18.3 specifications and ASTM F912 standards. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial use.
