S-96640A159 2-56 x 5/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement through Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Streamlined installation with Phillips No. 1 drive and standard 82° countersink angle for flush mounting in predrilled holes
• Full-threaded design provides maximum grip length and uniform stress distribution across the entire 5/8" length
• Regulatory compliance assurance meeting ASME B18.6.3 specifications for dimensional accuracy and performance standards
• Environmental responsibility with RoHS 3 and REACH compliance for restricted substance control in global markets

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical performance advantages in precision assembly applications where surface flushness and corrosion resistance are paramount. The black-oxide 18-8 stainless steel construction provides enhanced oxidation protection while maintaining the material's inherent strength characteristics, making these Phillips drive screws ideal for electronic enclosures, machinery panels, and automotive components exposed to moderate corrosive elements. The coarse thread configuration ensures rapid installation in softer materials while the standardized 82° countersink angle guarantees proper seating in prepared holes. With 80,000 psi tensile strength, these fully threaded fasteners maintain joint integrity under dynamic loads and thermal cycling conditions common in industrial equipment and transportation applications.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards, these screws feature Class 2A thread fit tolerances for consistent mating with corresponding nuts and tapped holes. The UNC coarse thread (2-56) with right-hand direction follows established industrial threading conventions. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures these components meet international environmental and safety requirements for hazardous substance restrictions. Dimensional specifications include 0.162" head diameter, 0.051" head height, and standardized flat head profile for uniform application across industrial fastener systems.