S-91802A591 5/16"-18 x 2" 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 extended service life in harsh environments
• Exceptional tensile strength rated at 80,000 psi ensures reliable performance in demanding industrial applications
• Optimized thread engagement with UNC coarse threading and Class 2A fit provides secure fastening and easy installation
• Enhanced drive stability through No. 4 Phillips drive design prevents cam-out during high-torque applications
• Consistent dimensional accuracy maintained through full compliance with ASME B18.6.3 manufacturing standards
• Environmental compliance assurance with RoHS 3 and REACH regulations for safe use across global markets
• Versatile oval head design combines aesthetic appeal with functional countersinking capability for flush mounting

Professional Applications & Engineering Value

These passivated 18-8 stainless steel oval head screws deliver critical corrosion resistance where moisture, chemicals, or outdoor exposure would compromise ordinary fasteners. The UNC coarse threading ensures rapid installation and superior holding power in materials prone to stripping, while the Phillips drive system provides familiar, efficient torque application for assembly line operations. Engineered with 80,000 psi tensile strength and Rockwell B80 hardness, these industrial-grade screws maintain structural integrity under vibration and load stress, making them ideal for machinery, electrical enclosures, and structural assemblies where reliable fastening performance is non-negotiable. The oval head profile offers both decorative finishing and practical countersinking for applications requiring smooth surface transitions.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18) and right-hand thread direction. Full compliance with ASME B18.6.3 specifications ensures dimensional consistency and mechanical performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming absence of restricted substances. The 2" length and fully threaded design provide maximum engagement depth for secure fastening applications.