S-91385A159 5/16"-18 x 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
- Vibration-resistant locking with Nylon Patch thread locker maintains secure fastening in high-stress environments
- Exceptional temperature tolerance from -50°F to 250°F ensures reliable performance in extreme operating conditions
- Superior corrosion protection through Black-Oxide coating extends service life in demanding industrial applications
- Precise Class 3A thread fit delivers consistent engagement and reduces assembly time with standardized UNC coarse threading
- High-strength alloy steel construction with Rockwell C45 hardness provides excellent wear resistance and load-bearing capacity
- Compact headless design enables flush mounting in space-constrained assemblies while maintaining full fastening strength
- Cup point configuration creates positive seating and prevents slippage on shaft components and rotating parts
Professional Applications & Engineering Value
Engineered for precision industrial applications, this 5/16"-18 UNC set screw combines Black-Oxide Alloy Steel construction with advanced Nylon Patch thread locking technology to solve critical vibration-induced loosening problems in machinery and equipment. The coarse thread spacing ensures rapid installation in production environments while maintaining Class 3A thread fit accuracy for consistent torque performance. The cup point tip design provides superior bite and resistance to rotational forces, making it ideal for securing collars, gears, and pulleys on shafts in automotive, manufacturing, and heavy equipment applications. With temperature stability from -50°F to 250°F, this headless fastener delivers reliable performance in both extreme cold and high-temperature industrial settings.
Specification Summary & Compliance
This set screw features 5/16"-18 UNC coarse threads with precision Class 3A thread fit tolerances and 5/32" hex drive configuration. Manufactured to ASME B18.3 specifications using Rockwell C45 hardened alloy steel with Black-Oxide surface treatment. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
