S-91385A166 3/8"-16 x 3" 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 locking performance from -50°F to 250°F
- Superior corrosion protection through black-oxide surface treatment on alloy steel construction
- Maximum thread engagement with Class 3A thread fit ensuring precise, reliable fastening in demanding applications
- High-strength durability from Rockwell C45 hardness rating for long-term performance under heavy loads
- Secure installation using standard 3/16" hex drive for consistent torque application without head interference
- Enhanced grip capability through cup tip design that concentrates pressure for superior holding power
- Industry-standard compatibility with UNC coarse 3/8"-16 threads meeting ASME B18.3 specifications
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical vibration resistance in industrial machinery, automotive assemblies, and power transmission systems where permanent locking is essential. The nylon patch thread locker eliminates the need for secondary locking mechanisms while maintaining performance across extreme temperature ranges (-50°F to 250°F). Engineered with Class 3A UNC threads and Rockwell C45 hardness, this headless hex drive set screw provides reliable fastening in high-stress applications where space constraints and vibration-induced loosening pose significant engineering challenges. The cup tip design ensures maximum gripping force on shafts and collars without damaging component surfaces.
Specification Summary & Compliance
This 3" length set screw features 3/8"-16 UNC coarse threads with Class 3A thread fit for precision engagement. Manufactured to ASME B18.3 standards with material specifications meeting ASTM F912. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The permanent nylon patch thread locker provides consistent locking performance throughout the specified temperature range while maintaining full compliance with industrial safety and environmental standards.
