S-91802A083 2-56 x 5/8" ASME B18.6.3 Stainless Steel Phillips Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for long-lasting performance in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness to withstand high-stress applications
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring reliable fastening and vibration resistance
• Optimal flush mounting with standard oval head profile and 82° countersink angle for seamless surface integration
• Enhanced drive stability with Phillips No. 1 drive style providing secure torque transmission during installation
• Full threading coverage along the 5/8" length for maximum grip strength and load distribution
• Regulatory compliance assurance meeting ASME B18.6.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

These 2-56 UNC oval head Phillips flat head screws deliver critical engineering solutions where surface finish integrity and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for industrial equipment, marine components, and food processing machinery. The combination of fully threaded design and Class 2A thread fit ensures maximum thread engagement and vibration resistance in dynamic applications. The standard oval head profile with 82° countersink angle creates a smooth, flush finish that eliminates protrusions in precision assemblies. With coarse thread spacing and right-hand thread direction, these screws provide rapid installation and reliable performance in demanding mechanical systems.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerance for precision engagement. Features UNC coarse threads with 2-56 thread size and right-hand thread direction. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The passivated surface treatment on 18-8 stainless steel enhances corrosion resistance while maintaining the material's inherent strength characteristics of 80,000 psi tensile strength and Rockwell B80 hardness.