S-90289A756 1/2"-20 x 1" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Maximum holding power achieved through Rockwell C45 hardness and serrated locking design preventing component slippage
• Precision thread engagement with Class 3A fit ensuring reliable fastening in high-vibration applications
• Easy installation and removal via 1/4" hex drive while maintaining headless profile for space-constrained assemblies
• Enhanced grip penetration from cup tip design that creates permanent seating in shafts and collars
• Industry-standard compatibility with UNF fine threading (1/2"-20) for interchangeability across equipment systems
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global supply chain integration

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical vibration resistance in power transmission systems, machinery collars, and precision tooling where permanent positioning is paramount. The Class 3A thread fit maintains dimensional stability under thermal cycling, while the cup tip design bites into mating surfaces without causing stress fractures. Engineered for high-torque applications, the 1/4" hex drive accommodates standard tools while the headless construction eliminates protrusion in rotating assemblies. Ideal for industrial set screw requirements in automotive, aerospace, and heavy equipment sectors demanding UNF fine threading reliability.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerances for precision UNF 1/2"-20 threading. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification confirms Rockwell C45 hardness and black-oxide surface treatment for consistent performance in regulated industrial applications.