S-91381A675 4-40 x 3/8" 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 for extended service life in harsh environments
- Exceptional thread engagement with Class 3A fit ensuring precise, vibration-resistant fastening in critical assemblies
- Enhanced component protection through brass soft tip that prevents damage to mating surfaces while maintaining secure positioning
- Optimized torque transmission via 0.050" hex drive providing reliable installation with standard industrial tools
- Consistent performance backed by Rockwell C28 hardness for durable, deformation-resistant threading
- Broad compatibility with 4-40 UNC coarse threads meeting common North American equipment specifications
- Regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
This 4-40 UNC set screw delivers critical engineering solutions for precision assembly challenges. The black-oxide alloy steel construction provides excellent corrosion resistance while maintaining the Rockwell C28 hardness required for repeated adjustments in demanding applications. The brass soft tip is engineered to prevent marring of shafts, gears, and collars while ensuring positive locking action. With Class 3A thread fit and coarse UNC threads, this headless fastener offers reliable positioning in machinery, automotive components, and electronic enclosures where vibration resistance and precise alignment are paramount. The hex drive design allows for high-torque installation in confined spaces, making it ideal for maintenance and production environments requiring dependable set screw performance.
Specification Summary & Compliance
This precision set screw features 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications with a length of 3/8" and 0.050" hex drive. The assembly meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental safety and regulatory acceptance in industrial markets worldwide.
