S-92991A149 1/2"-20 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass construction for long-lasting performance in harsh environments
• Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant fastening
• Easy installation and removal with 1/4" hex drive providing secure tool grip and torque transmission
• Enhanced holding power with cup tip design concentrating pressure for superior component retention
• Exceptional durability with Rockwell B55 hardness maintaining structural integrity under repeated use
• Industry-standard compatibility with UNF fine threads (1/2"-20) fitting precision machinery components
• Headless space-saving design allowing flush mounting in confined assembly spaces

Professional Applications & Engineering Value

This brass set screw delivers critical engineering solutions where corrosion resistance and precision threading are paramount. The UNF fine thread (1/2"-20) with Class 3A fit provides superior vibration resistance in dynamic industrial equipment, while the cup tip design creates concentrated pressure points for secure component positioning in shafts, collars, and gears. The headless configuration enables flush mounting in space-constrained assemblies, and the 1/4" hex drive ensures reliable torque application during installation. Manufactured from brass with Rockwell B55 hardness, these set screws maintain mechanical integrity in electrical components, marine hardware, and precision instruments where galvanic corrosion must be avoided.

Specification Summary & Compliance

This set screw features precise 1/2"-20 UNF fine threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications with right-hand thread direction and 3/8" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications.