S-91375A838 1/4"-20 x 5/16" 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 corrosion resistance with zinc plating that protects against rust in harsh industrial environments
- Exceptional holding power from Rockwell C45 hardness, preventing deformation under high torque loads
- Precise thread engagement with Class 3A fit ensuring reliable fastening in critical assemblies
- Easy installation in confined spaces thanks to the headless design and 1/8" hex drive
- Enhanced grip and alignment through cup tip configuration that minimizes component slippage
- Broad compatibility with UNC coarse threading (1/4"-20) for common industrial applications
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global supply chain integration
Professional Applications & Engineering Value
This zinc plated alloy steel set screw delivers critical performance in demanding mechanical systems where vibration resistance and permanent positioning are paramount. The UNC coarse thread configuration combined with Class 3A thread fit provides excellent engagement in soft materials and rapid assembly, while the cup tip design creates concentrated pressure points that prevent rotational movement in pulleys, gears, and collars. The headless construction and compact 5/16" length make it ideal for space-constrained applications in machinery, automotive components, and power transmission equipment. With Rockwell C45 hardness ensuring dimensional stability under stress, this hex drive set screw maintains clamping force in high-vibration environments where loosening could cause equipment failure.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision for consistent engagement. Features 1/4"-20 UNC coarse threads with right-hand direction and 5/16" length. The zinc plated alloy steel construction provides surface protection while maintaining Rockwell C45 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use.
