S-91500A088 2-56 x 3/8" 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 and passivated surface treatment
• Reliable high-strength performance with 70,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Precision threading with UNC coarse thread and Class 2A fit ensures consistent, secure fastening and easy installation
• Optimized flush mounting with standard 82° countersink angle flat head design for smooth, unobtrusive surface finishes
• Wide industry compatibility meeting ASME B18.6.3 specifications for quality assurance in mechanical assemblies
• Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
• Full-threaded design provides maximum grip length and holding power across the entire fastener length

Professional Applications & Engineering Value

This 316 stainless steel flat head screw delivers exceptional value in corrosive or high-moisture environments where standard fasteners fail. The combination of passivated finish and marine-grade 316 stainless steel provides superior protection against saltwater, chemicals, and industrial atmospheres. The UNC coarse threading and Class 2A fit ensure rapid installation with reduced cross-threading risk, while the Phillips No. 1 drive offers familiar, efficient torque application. Ideal for marine equipment, chemical processing machinery, food processing systems, and outdoor infrastructure, this fastener maintains integrity where corrosion resistance and structural reliability are critical to operational safety and equipment longevity.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with precise Class 2A thread fit tolerances for consistent performance. Features 2-56 UNC coarse threads with right-hand direction and standard 82° flat head profile. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The fully threaded design provides maximum engagement while maintaining specified mechanical properties including 70,000 psi tensile strength and Rockwell B80 hardness.