S-91500A086 2-56 x 5/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction with passivated finish
• High-strength performance with 70,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring reliable fastening
• Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Enhanced driving efficiency with No. 1 Phillips drive preventing cam-out during installation
• Full thread coverage along the 5/16" length providing maximum grip and load distribution
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These 2-56 UNC flat head screws in 316 stainless steel address critical challenges in industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of passivated finish and marine-grade stainless steel provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The fully threaded design with coarse thread spacing ensures superior holding power in various materials, while the 82° countersink angle creates seamless flush installations that prevent snagging and maintain aerodynamic surfaces. The Phillips drive configuration offers familiar, efficient installation with reduced tool slippage, supporting rapid assembly in high-volume manufacturing and maintenance operations where time efficiency and fastener integrity are crucial.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications, these screws feature Class 2A thread fit tolerances for consistent performance across industrial applications. The inch-system measurements include 2-56 UNC thread size with coarse spacing, 5/16" length, and standard flat head profile. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and material safety, while the right-hand thread direction and fully threaded construction provide universal compatibility with standard industrial components and assembly processes.