S-91381A366 3/8"-24 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
- Precision Class 3A thread fit ensures superior fastening accuracy and vibration resistance in demanding applications
- Brass soft tip design prevents surface damage to expensive components while maintaining secure positioning
- Black-oxide alloy steel construction provides excellent corrosion resistance and durability in industrial environments
- Rockwell C28 hardness rating delivers optimal strength-to-toughness balance for repeated adjustments
- Fine UNF thread profile offers enhanced load distribution and superior holding power compared to coarse threads
- Hex drive configuration enables high-torque installation with standard tools while maintaining headless profile
- Environmental compliance meets RoHS and REACH standards for sustainable manufacturing practices
Professional Applications & Engineering Value
This black-oxide alloy steel set screw with Class 3A UNF fine thread addresses critical engineering challenges in precision assembly applications. The brass soft tip (0.094" length) eliminates marring and surface damage on shafts, gears, and collars while providing secure locking. The headless hex drive design allows flush mounting in confined spaces, making it ideal for machinery, automotive, and aerospace components where vibration resistance and precise positioning are paramount. The combination of Rockwell C28 hardness and fine thread spacing ensures reliable performance in high-stress applications, preventing loosening under dynamic loads while maintaining dimensional stability across temperature variations.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features 3/8"-24 UNF fine threads with right-hand direction, 1/2" length, and 3/16" hex drive. The black-oxide surface treatment on alloy steel substrate provides corrosion protection. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.
