S-91772A625 5/16"-18 x 1 1/4" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Optimized drive engagement featuring Phillips No. 4 drive for secure installation and reduced cam-out risk
• Precision threading with UNC coarse thread and Class 2A fit ensuring consistent engagement and vibration resistance
• Full-length threading provides maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance meets ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Versatile pan head design with rounded profile offers low-profile installation and improved aesthetic appearance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 5/16"-18 UNC coarse thread screws deliver exceptional performance in machinery assembly, electrical enclosures, and structural frameworks. The passivated 18-8 stainless steel construction provides superior corrosion resistance, significantly extending service life in humid or chemically aggressive environments. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance under dynamic loads and vibration, while the fully threaded design maximizes clamping force distribution. The pan head with Phillips No. 4 drive facilitates efficient installation in confined spaces, making these industrial fasteners ideal for maintenance operations and production line applications where reliability and corrosion resistance are critical.

Specification Summary & Compliance

These rounded head screws feature precision UNC coarse threads with Class 2A thread fit tolerance, ensuring consistent mating with standard nuts and threaded components. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances. The right-hand thread direction and 1-1/4" length provide standardized installation compatibility across industrial applications.