S-91375A899 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 Class 3A thread fit ensuring tight, secure fastening in high-stress applications
- Enhanced corrosion protection through zinc plating, extending service life in demanding industrial environments
- High-strength durability from Rockwell C45 hardened alloy steel, preventing stripping and deformation under heavy loads
- Secure torque transmission via 5/32" hex drive, allowing precise installation without cam-out in confined spaces
- Reliable positioning with cup tip design that bites into surfaces, preventing component slippage and movement
- Industry-standard compatibility with 5/16"-18 UNC coarse threads, ensuring interchangeability across equipment and machinery
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This 5/16"-18 UNC set screw delivers critical engineering solutions for industrial assembly challenges. The zinc plated alloy steel construction combined with Rockwell C45 hardness provides exceptional resistance to vibrational loosening and environmental degradation in machinery, automotive, and manufacturing equipment. The headless design with hex drive enables flush mounting in space-constrained applications while maintaining high torque capability. Class 3A thread fit and coarse threading ensure rapid installation and reliable clamping force for permanent component positioning. The cup tip creates positive engagement with shaft surfaces, preventing rotational slippage in power transmission systems and pulley assemblies where precise alignment is critical.
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. Meets ASTM F912 material standards for consistent performance in industrial fastening applications.
