S-91802A078 2-56 x 5/16" ASME B18.6.3 Stainless Steel Phillips Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
• Exceptional tensile strength rated at 80,000 psi for secure fastening in demanding applications
• Precision Class 2A thread fit with UNC coarse threading for easier installation and reduced cross-threading risk
• Optimized Phillips drive design (No. 1 size) providing efficient torque transfer and reduced cam-out potential
• Fully threaded shank maximizing grip length and load distribution across the entire fastener
• Industry standard compliance meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

These 2-56 UNC oval head Phillips flat head screws deliver critical performance advantages in industrial settings where corrosion resistance and reliable fastening are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for electronics enclosures, machinery panels, and outdoor equipment. The oval head profile combines aesthetic appeal with functional countersinking capability, while the Phillips drive system ensures quick installation with standard tools. With coarse UNC threading and Class 2A fit, these screws offer superior engagement in various materials without compromising installation speed, reducing assembly time and improving production efficiency in manufacturing and maintenance operations.

Specification Summary & Compliance

This 2-56 UNC flat head screw features precision Class 2A thread fit with coarse thread spacing and full threading along its 5/16" length. Manufactured to ASME B18.6.3 specifications, it ensures dimensional accuracy and interchangeability. The fastener meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) standards for chemical safety. Material properties include Rockwell B80 hardness and 80,000 psi tensile strength, providing reliable mechanical performance across industrial applications.