S-91500A342 1/4"-20 x 5" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional mechanical strength with 70,000 psi tensile rating for reliable performance in demanding applications
• Optimized flush mounting with standard 82° countersink angle and flat head design for secure, unobtrusive installations
• Enhanced driving efficiency through Phillips No. 3 drive system, reducing cam-out risks during high-torque assembly
• Consistent thread engagement with UNC coarse threading and Class 2A fit, ensuring vibration-resistant fastening
• Full-length threading provides maximum grip along the entire 5" shaft length for superior load distribution
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel flat head screws deliver exceptional performance where corrosion resistance is critical. The passivated finish enhances surface durability while maintaining the material's inherent resistance to chlorides and acidic conditions. With UNC coarse threads and Class 2A thread fit, installation efficiency is maximized while maintaining precise tolerances for vibration-prone applications. The fully threaded design ensures uniform stress distribution across the entire 5" length, making these Phillips drive screws ideal for structural assemblies, marine equipment, chemical processing systems, and outdoor infrastructure where long-term reliability is essential. The standardized 82° countersink angle provides seamless flush mounting in predrilled surfaces, eliminating protrusions in finished applications.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. The inch-system fasteners feature 1/4"-20 UNC coarse threads with fully threaded 5" length and Rockwell B80 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The passivated surface treatment meets industry standards for enhanced corrosion protection while maintaining dimensional stability.