S-91381A578 5/16"-18 x 1/2" 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 coating on alloy steel, extending service life in harsh industrial environments
- Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in critical assemblies
- Non-marring brass soft tip protects finished surfaces while maintaining strong clamping force
- High-strength Rockwell C28 hardness provides excellent durability and resistance to wear under heavy loads
- Hex drive design allows for easy installation and high torque application in confined spaces
- Coarse UNC threading enables quick assembly and reliable performance in vibration-prone applications
- Headless construction offers flush mounting for applications requiring smooth, uninterrupted surfaces
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and corrosion protection are critical. The combination of Class 3A thread precision and coarse UNC threading ensures reliable performance in machinery, automotive components, and power transmission systems where loosening under dynamic loads is a concern. The brass soft tip provides an ideal solution for securing pulleys, gears, and collars onto shafts without damaging precision-machined surfaces. The hex drive configuration enables high torque application in space-constrained assemblies, making it particularly valuable for maintenance and manufacturing applications requiring repeated adjustments without compromising fastener integrity.
Specification Summary & Compliance
This 5/16"-18 UNC set screw features precise Class 3A thread fit with coarse thread spacing, manufactured to exacting dimensional standards. The component meets ASME B18.3 specifications for dimensional accuracy and performance requirements. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety. The Rockwell C28 hardness rating guarantees consistent mechanical properties, while the black-oxide surface treatment provides enhanced corrosion protection for extended service life in industrial environments.
