S-91375A581 5/16"-18 x 3/4" 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 holding power with Class 3A thread fit for reliable, vibration-resistant fastening in demanding applications
- Exceptional durability from Rockwell C45 hardness alloy steel, providing excellent resistance to wear and deformation
- Enhanced corrosion resistance with black-oxide coating, extending service life in industrial environments
- Secure installation through hex drive design, allowing high torque application without slippage
- Firm gripping action with cup tip design, preventing component movement while minimizing surface damage
- Precision manufacturing to ASME B18.3 standards, ensuring consistent quality and dimensional accuracy
- Regulatory compliance with RoHS 3 and REACH, making them suitable for global industrial applications
Professional Applications & Engineering Value
This 5/16"-18 UNC set screw delivers critical engineering solutions for industrial assembly challenges where vibration resistance and permanent positioning are paramount. The black-oxide alloy steel construction combined with Rockwell C45 hardness provides exceptional strength to withstand mechanical stress in machinery, automotive components, and power transmission systems. The headless design with hex drive enables flush mounting in confined spaces while the cup tip creates concentrated pressure points for superior grip on shafts, collars, and gears. Engineered with Class 3A thread fit and coarse UNC threads, these set screws maintain clamping force under dynamic loads, preventing loosening in high-vibration environments common in manufacturing equipment and heavy machinery applications.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit tolerance for superior engagement and UNC coarse threads (5/16"-18) ensuring quick assembly. Complies with ASME B18.3 specifications for socket set screws and meets ASTM F912 material requirements. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for international industrial markets.
