S-92991A151 1/2"-20 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass construction for long-lasting performance in demanding environments
• Exceptional thread engagement with Class 3A fit ensuring precise, vibration-resistant fastening
• Optimized torque transmission through 1/4" hex drive design for secure installation without slippage
• Maximum holding power with cup point tip that bites into materials for permanent component positioning
• Enhanced durability with Rockwell B55 hardness maintaining structural integrity under repeated use
• Space-saving installation through headless design ideal for confined applications and flush mounting
• Reliable fine threading with 1/2"-20 UNF configuration providing superior load distribution

Professional Applications & Engineering Value

This precision brass set screw delivers critical engineering solutions where corrosion resistance and reliable positioning are paramount. The Class 3A thread fit ensures exceptional tolerance control, eliminating play in precision assemblies while the cup point tip creates permanent seating in shafts, collars, and gears. The headless design with 1/4" hex drive allows flush installation in space-constrained applications while providing sufficient torque capability. Manufactured from brass material, it prevents galvanic corrosion when used with dissimilar metals and maintains performance in humid or chemical environments. The fine UNF threading offers superior vibration resistance compared to coarse threads, making it ideal for machinery, automotive components, and precision instruments where movement could compromise assembly integrity.

Specification Summary & Compliance

This set screw features precision 1/2"-20 UNF fine threads with Class 3A fit for exacting dimensional accuracy and superior engagement. The manufacturing process adheres to ASME B18.3 specifications ensuring consistent quality and performance. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming the absence of restricted substances. With Rockwell B55 hardness and standardized dimensions including 0.5" thread diameter and 1/2" length, this component delivers reliable performance across industrial applications requiring precise component positioning and corrosion resistance.