S-91773A078 2-56 x 5/16" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength delivering 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under load
• Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring secure fastening and vibration resistance
• Complete threading coverage providing maximum grip and holding power across the entire 5/16" length
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Enhanced drive efficiency with No. 1 Phillips drive and rounded head design for easier installation and reduced cam-out
• Environmental responsibility through RoHS 3 and REACH compliance, ensuring safe use in regulated applications

Professional Applications & Engineering Value

These 2-56 UNC rounded head Phillips screws deliver critical performance advantages in demanding industrial applications where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material with passivated finish provides exceptional protection against oxidation and chemical exposure, making them ideal for electronics enclosures, medical devices, marine equipment, and food processing machinery. The fully threaded coarse pitch design ensures maximum thread engagement in various materials, while the Class 2A thread fit maintains precise tolerances for consistent assembly. The rounded head profile with No. 1 Phillips drive facilitates quick installation without compromising structural integrity, solving common challenges of strip-out and inconsistent torque application in high-volume manufacturing environments.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards, these screws maintain precise dimensional control with Class 2A thread fit tolerances and UNC coarse thread specifications. The 5/16" length and 0.086" thread diameter ensure consistent performance across applications. Regulatory compliance includes full adherence to RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) requirements for chemical safety, making them suitable for global industrial markets with strict environmental regulations.