S-91500A341 1/4"-20 x 2 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent, vibration-resistant fastening
• Enhanced surface protection through passivated finish that improves corrosion resistance without compromising dimensional integrity
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Broad regulatory compliance meeting ASME B18.6.3 specifications while being RoHS 3 and REACH compliant for global applications
• Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener

Professional Applications & Engineering Value

This 316 stainless steel flat head screw delivers critical performance advantages in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of fully threaded UNC coarse threads and Class 2A thread fit ensures rapid installation and secure fastening in applications subject to vibration and dynamic loads. The passivated finish significantly enhances the inherent corrosion resistance of 316 stainless steel, making these Phillips drive screws ideal for chemical processing equipment, marine hardware, and food processing machinery where exposure to aggressive media is common. The 82° countersink angle and flat head profile facilitate flush mounting in precision assemblies, while the substantial 2 3/4" length provides ample engagement depth for structural connections.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent threading performance. Features UNC coarse threads (1/4"-20) with right-hand thread direction and standard flat head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. The screw maintains dimensional precision with 0.507" head diameter and 0.153" head height for standardized installation across industrial applications.