S-91375A879 1/4"-20 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 corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- Maximum holding power achieved through Rockwell C45 hardness, preventing deformation under high stress
- Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
- Easy installation in confined spaces thanks to the headless hex drive design requiring only 1/8" wrench access
- Enhanced grip and anti-loosening from the cup point tip that bites into mating surfaces
- Durable coarse UNC threads that resist stripping and allow for quick assembly in right-hand applications
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This 1/4"-20 UNC set screw delivers exceptional engineering value in applications requiring secure component positioning. The zinc plated alloy steel construction provides reliable corrosion protection while maintaining Rockwell C45 hardness for sustained clamping force. The headless hex drive design enables installation in space-constrained assemblies, while the cup point tip creates permanent indentation in shafts and collars to prevent rotational slippage. Particularly valuable in machinery, automotive, and manufacturing equipment where vibration resistance and precise alignment are critical, this industrial set screw solves common loosening issues through its Class 3A thread fit and aggressive point design that maintains position under dynamic loads.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit precision for superior dimensional accuracy. Features 1/4"-20 UNC coarse threads with right-hand direction and 1-1/4" length. Fully compliant with RoHS 3 (2015/863/EU) for hazardous substance restriction and REACH (EC 1907/2006) regulations for chemical safety. The zinc plated alloy steel construction meets ASTM F912 requirements for consistent performance in industrial fastening applications.
