S-91385A161 5/16"-18 x 1 1/4" 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 vibration resistance with nylon patch thread locker that maintains secure fastening in high-stress environments
- Exceptional durability from Rockwell C45 hardened black-oxide alloy steel construction for extended service life
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable performance in demanding applications
- Wide temperature tolerance with thread locker effective from -50°F to 250°F for diverse operating conditions
- Easy installation and removal through hex drive design requiring minimal clearance in confined spaces
- Enhanced gripping capability with cup tip design providing superior holding power against rotational forces
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations for global industrial use
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications requiring permanent, vibration-resistant fastening. The Class 3A UNC coarse threads provide superior thread engagement in soft materials and castings, while the nylon patch thread locker eliminates the need for additional locking compounds in assembly operations. Engineered with Rockwell C45 hardness, this headless set screw withstands repeated adjustments without thread deformation, making it ideal for precision machinery, automotive components, and manufacturing equipment where hex drive accessibility and temperature resistance are essential. The cup tip design concentrates gripping force to prevent shaft slippage, ensuring reliable performance in torque-critical applications.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features 5/16"-18 UNC coarse threads with right-hand direction and 1-1/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide surface treatment provides corrosion resistance while maintaining dimensional stability across specified temperature ranges.
