S-91375A733 4-40 x 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
- Exceptional holding power achieved through Rockwell C45 hardness and Class 3A thread fit for secure fastening
- Easy installation in confined spaces with headless hex drive design requiring only 0.050" drive tool access
- Enhanced grip and minimal surface damage from the cup tip design that concentrates clamping force
- Reliable coarse thread engagement with UNC thread form for quick assembly and vibration resistance
- Industry-standard compatibility meeting ASME B18.3 specifications for consistent performance
- Environmental compliance assurance with RoHS 3 and REACH standards for global manufacturing applications
Professional Applications & Engineering Value
This 4-40 UNC set screw delivers critical engineering solutions for precision assemblies requiring secure component positioning. The zinc plated alloy steel construction combined with Rockwell C45 hardness ensures lasting performance in mechanical systems subject to vibration and load stresses. The headless hex drive design allows installation in space-constrained applications while maintaining high torque capability. The cup tip configuration provides concentrated contact pressure, preventing shaft damage while creating reliable locking action in pulleys, gears, and collars. These industrial set screws are particularly valuable in manufacturing equipment, automotive components, and precision instruments where Class 3A thread fit guarantees consistent clamping force and dimensional accuracy.
Specification Summary & Compliance
This set screw maintains precise 4-40 UNC thread dimensions with Class 3A thread fit tolerances and coarse thread spacing for optimal engagement. Manufacturing complies with ASME B18.3 specifications where applicable under ASTM F912. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) standards for chemical safety, ensuring suitability for global industrial applications and environmental regulations.
