S-91802A593 5/16"-18 x 2 1/2" 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 mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for heavy-duty fastening applications
• Optimized thread engagement with UNC coarse threading and Class 2A fit providing secure installation and vibration resistance
• Enhanced drive stability through No. 4 Phillips drive design, reducing cam-out during installation
• Streamlined installation profile with standard oval head and 82° countersink angle for flush mounting in various materials
• Reliable partial threading design allowing precise clamping force control across the 1½" threaded portion
• Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these passivated 18-8 stainless steel oval head screws deliver exceptional performance where corrosion resistance and mechanical reliability are critical. The 5/16"-18 UNC coarse thread configuration ensures rapid installation and superior holding power in metal assemblies, wood constructions, and equipment manufacturing. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening under vibration while the oval head profile with standard Phillips drive provides both aesthetic appeal and practical installation benefits. These fasteners solve common engineering challenges in marine equipment, food processing machinery, and outdoor structures where environmental exposure would compromise inferior fasteners, offering maintenance-free service life through their corrosion-resistant properties and consistent mechanical performance.

Specification Summary & Compliance

This oval head screw features precise Class 2A thread fit with 5/16"-18 UNC coarse threading and partial threading up to 1½". Manufactured to ASME B18.6.3 specifications with dimensional accuracy including 0.597" head diameter and 2½" total length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications while maintaining consistent quality standards.