S-92949A592 5/16"-18 x 4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• Superior mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty load-bearing applications
• Precise thread engagement with Class 3A thread fit ensuring reliable, vibration-resistant fastening in critical assemblies
• High-torque installation capability through hex drive design providing secure tool engagement and reduced cam-out risk
• Maximum grip length utilization with fully threaded shank design for consistent holding power across the entire 4" length
• Regulatory compliance assurance meeting ASME B18.3 standards plus RoHS 3 and REACH environmental regulations
• Optimized for quick assembly with UNC coarse threads enabling faster installation and reduced cross-threading incidents

Professional Applications & Engineering Value

These 5/16"-18 UNC rounded head screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The 18-8 stainless steel composition combined with passivated surface treatment creates a protective oxide layer that significantly extends service life in chemically aggressive or moisture-rich industrial environments. The hex drive configuration provides superior torque transmission compared to standard drive types, preventing fastener damage during high-torque applications while the rounded button head profile offers a clean, low-profile appearance with reduced snag hazards. Particularly valuable in heavy machinery, structural frameworks, and processing equipment, these fully threaded screws ensure uniform stress distribution along the entire engagement length, eliminating weak points that can compromise assembly integrity under dynamic loads and vibration.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit for superior engagement and UNC coarse thread spacing optimized for rapid assembly. These screws conform to ASME B18.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance is verified through RoHS 3 (2015/863/EU) restriction adherence and REACH (EC 1907/2006) substance regulation compliance, ensuring suitability for global industrial applications with stringent environmental requirements.