S-91375A886 5/16"-18 x 1/2" 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 holding power with Class 3A thread fit ensuring precise, vibration-resistant connections in demanding applications
- Enhanced corrosion resistance through zinc plating, extending service life in industrial environments
- High-strength durability with Rockwell C45 hardness alloy steel construction resisting deformation under heavy loads
- Secure installation using 5/32" hex drive for reliable torque transmission without head interference
- Optimized grip with cup tip design providing concentrated contact pressure to prevent component slippage
- Industry compliance meeting ASME B18.3 specifications for consistent performance and interchangeability
- Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries
Professional Applications & Engineering Value
These 5/16"-18 UNC set screws deliver exceptional engineering value in industrial applications where vibration resistance and permanent positioning are critical. The zinc plated alloy steel construction combined with Rockwell C45 hardness ensures these headless set screws maintain their grip under continuous stress, preventing loosening in machinery, motor assemblies, and precision equipment. The coarse thread spacing and Class 3A thread fit provide rapid installation while maintaining tight tolerances, while the cup tip design concentrates force for superior holding power on shafts, collars, and gears. These hex drive set screws solve common industrial challenges of component slippage and maintenance downtime through their robust construction and standardized compliance.
Specification Summary & Compliance
This 5/16"-18 UNC set screw features precise Class 3A thread fit with coarse thread spacing and right-hand thread direction, manufactured to ASME B18.3 specifications where applicable per ASTM F912. The fastener maintains dimensional accuracy with 0.313" thread diameter and 1/2" length for consistent performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance in industrial markets.
