S-92991A139 3/8"-24 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 brass construction for long-lasting performance in demanding environments
- Exceptional thread precision with Class 3A UNF fine threads ensuring reliable, vibration-resistant fastening
- Enhanced gripping power from the cup tip design that bites into surfaces for secure component positioning
- Optimized torque transmission through the 3/16" hex drive providing superior installation control
- Consistent mechanical performance with Rockwell B55 hardness balancing durability and machinability
- Space-saving headless design allowing flush mounting in confined assembly spaces
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH)
Professional Applications & Engineering Value
This brass set screw delivers critical engineering advantages for precision assemblies requiring corrosion-resistant fastening solutions. The combination of UNF Class 3A fine threads and cup tip design addresses common industrial challenges like vibration-induced loosening and component slippage in machinery, electrical enclosures, and marine applications. The headless configuration with hex drive enables secure installations in space-constrained environments while maintaining accessibility for maintenance. With Rockwell B55 hardness, this fastener provides the ideal balance between mechanical strength and material workability, preventing galling during installation while ensuring long-term holding power in dynamic operating conditions.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with precision 3/8"-24 UNF Class 3A threads maintaining tight tolerances for reliable engagement. The fine thread spacing and right-hand thread direction ensure optimal clamping force distribution. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across regulated industries. Dimensional accuracy includes 1/4" length and 0.375" thread diameter for consistent performance in precision assembly applications.
