S-91802A595 5/16"-18 x 3" 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 mechanical strength delivering 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under heavy loads
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced drive stability through No. 4 Phillips drive design providing positive torque transmission and reduced cam-out risk
• Streamlined installation with oval head profile and standard countersink angle enabling flush mounting in prepared surfaces
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Versatile partial threading allowing unthreaded shank sections for precise clamping and alignment in assembled components

Professional Applications & Engineering Value

These passivated 18-8 stainless steel oval head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of 80,000 psi tensile strength and Rockwell B80 hardness ensures dependable fastening in structural applications, while the UNC coarse threading with Class 2A fit provides superior vibration resistance in machinery and equipment assembly. The oval head design with standard countersink angle creates clean, flush installations in metal fabrication, automotive components, and outdoor equipment. Particularly valuable in marine, chemical processing, and food processing applications, these Phillips drive screws maintain integrity despite exposure to moisture, chemicals, and temperature variations, significantly reducing maintenance frequency and replacement costs.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse thread specifications. Fully compliant with ASME B18.6.3 mechanical standards, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) chemical safety regulations. Features include 5/16"-18 thread size, 3" length with 1½" minimum thread engagement, 0.597" head diameter, and 82° countersink angle for standardized installation requirements.