S-91375A722 1/2"-13 x 2 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating protecting against rust and extending service life in harsh environments
• Exceptional thread engagement with Class 3A fit ensuring precise, vibration-resistant fastening in demanding applications
• High-torque installation capability through 1/4" hex drive design allowing secure tightening without head protrusion
• Enhanced material strength with Rockwell C45 hardness providing reliable performance under heavy mechanical loads
• Optimized grip and positioning with cup tip design creating positive contact points on shaft components
• Industry-standard compatibility with 1/2"-13 UNC coarse threads ensuring interchangeability across equipment and machinery
• Regulatory compliance assurance meeting ASME, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial equipment maintenance and manufacturing operations. The headless design with 1/4" hex drive enables flush mounting in confined spaces while providing substantial torque transmission capability. The Class 3A thread fit combined with UNC coarse threading ensures rapid installation and superior resistance to vibrational loosening in rotating assemblies, pulley systems, and coupling applications. The Rockwell C45 hardness rating guarantees structural integrity under repetitive stress cycles, while the black-oxide surface treatment provides essential corrosion protection in manufacturing environments exposed to moisture and chemicals. These set screws are engineered to maintain precise component alignment in machinery, automotive, and heavy equipment applications where reliability is paramount.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications with Class 3A thread tolerances for precision fit. The 1/2"-13 UNC coarse thread configuration follows standardized inch measurements with 2 1/2" length and 1/4" hex drive. Full compliance with ASTM F912 material standards, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) regulations ensures suitability for international industrial supply chains.