S-91375A221 5-44 x 1/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with fine UNF thread spacing and Class 3A fit for secure, long-term fastening in high-stress environments
• Exceptional durability from Rockwell C45 hardened black-oxide alloy steel, resisting wear and corrosion in industrial applications
• Precise component positioning using the cup tip design that creates consistent indentation without damaging shafts or components
• Easy installation in confined spaces with compact 1/8" headless design and 1/16" hex drive for straightforward tool access
• Reliable regulatory compliance meeting ASME B18.3 specifications, RoHS 3, and REACH standards for global industrial use
• Optimized for right-hand thread applications ensuring compatibility with standard assembly processes and equipment

Professional Applications & Engineering Value

These 5-44 UNF Class 3A set screws deliver critical engineering solutions for precision machinery and industrial equipment where component slippage can cause operational failures. The black-oxide alloy steel construction combined with Rockwell C45 hardness provides exceptional resistance to loosening under vibration, making them ideal for motor assemblies, gear systems, and rotating shaft applications. The cup tip design ensures positive locking without excessive penetration damage, while the fine thread spacing maintains clamping force in high-cycle applications. Their compact 1/8" length and headless configuration make them perfect for space-constrained assemblies where traditional fasteners cannot fit.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance in inch system applications. Features 5-44 UNF fine threads with right-hand direction and 1/16" hex drive. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.