S-91381A666 1/2"-13 x 5/8" 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, extending service life in harsh industrial environments
- Precise Class 3A thread fit ensures tight tolerances and reliable engagement for vibration-resistant assemblies
- Non-marring brass tip protects sensitive surfaces while maintaining secure mechanical locking
- High-strength Rockwell C28 hardness provides exceptional load-bearing capacity for heavy-duty applications
- 1/4" hex drive compatibility allows standard tooling use while maintaining headless design for space-constrained installations
- Coarse UNC threading enables quick installation and superior resistance to loosening under dynamic loads
- Comprehensive regulatory compliance meets ASME B18.3, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional engineering value in demanding applications where vibration resistance and surface protection are critical. The Class 3A UNC thread fit provides superior dimensional accuracy for precision assemblies in machinery, automotive components, and industrial equipment. The innovative brass soft tip eliminates surface damage on shafts, gears, and collars while maintaining positive mechanical locking. With Rockwell C28 hardness and corrosion-resistant coating, this fastener withstands heavy rotational forces and harsh operating conditions. The headless design with 1/4" hex drive enables installation in confined spaces using standard tools, making it ideal for permanent assemblies in manufacturing, aerospace, and power transmission systems where reliability is paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread tolerances for precision fit. Features 1/2"-13 UNC coarse threads with right-hand direction and 0.5" thread diameter. The 5/8" length provides optimal engagement depth. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures global acceptance for industrial applications.
