S-91375A286 12-24 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional hardness and durability from Rockwell C45 alloy steel, preventing deformation under high torque applications
• Precise Class 3A thread fit ensures secure fastening with minimal backlash in critical assemblies
• Compact headless design allows installation in confined spaces where protruding fasteners aren't feasible
• Reliable hex drive engagement with 3/32" drive size provides positive torque transmission without cam-out
• Effective cup tip configuration creates strong biting action for permanent positioning of components on shafts
• Industry-standard compliance meets ASME B18.3 specifications for consistent performance and interchangeability

Professional Applications & Engineering Value

This 12-24 UNC set screw delivers critical engineering solutions for permanent component positioning in industrial machinery. The black-oxide alloy steel construction provides essential corrosion protection while maintaining the Rockwell C45 hardness required for high-stress applications. The coarse thread spacing and Class 3A thread fit ensure rapid installation with exceptional vibration resistance, making these headless set screws ideal for securing pulleys, gears, and collars on rotating shafts. The hex drive design allows for high torque application in confined spaces, while the cup tip creates permanent dimples in shafts for reliable, non-slip fastening in automotive, manufacturing, and power transmission systems.

Specification Summary & Compliance

Manufactured to ASME B18.3 standards with Class 3A thread fit precision for superior dimensional accuracy. Features UNC coarse threads with 12-24 thread size, 0.216" diameter, and 3/4" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial applications.