S-91381A533 1/4"-20 x 1/4" ASME B18.3 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 black-oxide finish, extending service life in demanding industrial environments
- Exceptional thread precision with Class 3A fit ensures reliable, vibration-resistant fastening in critical assemblies
- Enhanced component protection through brass soft tip design that prevents surface damage during clamping
- Optimized torque transmission via 1/8" hex drive for secure installation without head protrusion
- Robust mechanical performance from alloy steel construction with Rockwell C28 hardness rating
- Wide compatibility with 1/4"-20 UNC coarse threads for common industrial applications
- Full regulatory compliance meeting ASME B18.3 specifications and environmental standards (RoHS 3/REACH)
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions for precision positioning and shaft securing applications. The UNC Class 3A thread system provides superior engagement in machinery, automotive, and manufacturing equipment where vibration resistance is paramount. The brass soft tip offers dual advantages: preventing damage to expensive shafts while maintaining exceptional gripping force through increased surface contact. Engineered with Rockwell C28 hardness, this headless hex drive set screw withstands repeated adjustments without deformation, making it ideal for permanent installations requiring periodic maintenance. The coarse thread pitch ensures quick assembly in production environments while the black-oxide surface treatment provides additional corrosion protection in industrial settings.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 standards with Class 3A thread fit for precision tolerance. Features 1/4"-20 UNC coarse threads with right-hand orientation and 1/4" length configuration. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The alloy steel construction with black-oxide finish meets industrial durability requirements while the brass tip (0.063" length, 1/8" diameter) provides component protection without compromising holding strength.
