S-91802A552 1/4"-20 x 2 1/2" 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 mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable heavy-duty fastening
• Optimized thread engagement through UNC coarse threading and Class 2A fit ensures secure installation and vibration resistance
• Enhanced driving efficiency with No. 3 Phillips drive and standard oval head profile for streamlined assembly operations
• Versatile partial threading design allows for both clamping and alignment functions in diverse industrial applications
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Precision dimensional control with 82° countersink angle and consistent oval head geometry for flush mounting requirements

Professional Applications & Engineering Value

These passivated 18-8 stainless steel oval head screws deliver critical performance advantages for industrial equipment assembly, machinery manufacturing, and structural applications where corrosion resistance and mechanical reliability are paramount. The combination of 80,000 psi tensile strength and Rockwell B80 hardness ensures dependable performance under dynamic loads and vibration, while the partial threading design provides optimal clamping force distribution. The No. 3 Phillips drive system facilitates efficient installation in confined spaces, and the standard oval head profile with 82° countersink angle creates a clean, finished appearance while maintaining structural integrity. These industrial-grade fasteners are engineered to withstand demanding environmental conditions while maintaining dimensional stability and thread integrity throughout their service life.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with Class 2A thread fit tolerance for precision assembly. Features UNC coarse threads (1/4"-20) with partial threading extending to minimum 1½" length. Full compliance with ASME B18.6.3 manufacturing specifications, RoHS 3 (2015/863/EU) environmental directive, and REACH (EC 1907/2006) regulatory standards for industrial use.