S-92949A559 1/4"-28 x 1/4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish for extended service life in harsh environments
• Exceptional thread precision with Class 3A fit ensuring reliable, vibration-resistant connections in critical assemblies
• High tensile strength of 70,000 psi provides dependable load-bearing capacity for demanding industrial applications
• Optimized hex drive design (5/32") enables secure tool engagement and efficient installation with standard tools
• Fully threaded construction delivers maximum grip length and uniform clamping force across the entire fastener
• Rounded button head profile offers a low-profile, aesthetically clean finish while minimizing snag hazards
• Comprehensive regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for global industrial acceptance

Professional Applications & Engineering Value

Engineered for precision assembly requirements, these 1/4"-28 UNF rounded head screws solve critical fastening challenges in machinery, electronics, and structural applications. The fine thread spacing and Class 3A thread fit provide superior resistance to vibrational loosening while maintaining precise alignment in threaded components. The combination of 18-8 stainless steel material and passivated surface treatment creates a robust barrier against chemical exposure and atmospheric corrosion, significantly extending maintenance intervals in industrial environments. The hex drive configuration ensures positive torque transmission during installation, while the rounded button head design eliminates sharp edges that could damage wiring or create safety hazards in confined spaces.

Specification Summary & Compliance

This fastener maintains Class 3A thread tolerances per UNF specifications with right-hand fine threading throughout the 1/4" length. Manufacturing conforms to ASME B18.3 standards for dimensional consistency and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, meeting the latest compliance requirements as of June 2023.