S-91375A546 1/4"-20 x 1 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for precise, vibration-resistant fastening in demanding applications
• Superior corrosion resistance through black-oxide surface treatment, extending service life in industrial environments
• High-strength durability from alloy steel construction with Rockwell C45 hardness, maintaining integrity under heavy loads
• Secure installation and removal with 1/8" hex socket drive, preventing tool slippage and ensuring consistent torque application
• Maximum grip and alignment through cup point tip design, digging into shafts to prevent component movement
• Reliable coarse threading with UNC 1/4"-20 specification for quick assembly and reduced cross-threading risk
• Flush mounting capability with headless design, ideal for space-constrained applications where protrusions aren't acceptable

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial assembly challenges. The combination of Rockwell C45 hardness and Class 3A thread fit ensures reliable performance in high-vibration environments where fastener loosening can compromise equipment safety. The cup point tip provides exceptional biting action into shafts and collars, preventing rotational slippage in power transmission systems, gear assemblies, and precision machinery components. With its UNC coarse threads and hex socket drive, this fastener enables rapid installation in production line settings while maintaining the precise alignment required for manufacturing equipment, automotive systems, and heavy machinery. The headless design further allows flush mounting in confined spaces where traditional fasteners cannot be used.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit and UNC 1/4"-20 coarse threading for consistent performance. This set screw conforms to ASME B18.3 specifications (ASTM F912) for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Right-hand thread direction and 1-1/2" length provide standardized installation across industrial applications.