S-91500A349 5/16"-18 x 1 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 with 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement with Class 2A thread fit ensuring consistent fastening and vibration resistance
• Enhanced durability through passivated surface treatment that increases corrosion protection without compromising dimensions
• Optimized flush mounting with 82° countersink angle and flat head design for seamless surface integration
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Environmental regulation adherence with RoHS 3 and REACH compliance for global industrial applications

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical performance advantages in demanding industrial settings where corrosion resistance and structural integrity are paramount. The combination of UNC coarse threading and Class 2A thread fit provides excellent engagement in various materials while resisting vibration-induced loosening. The passivated finish significantly enhances the natural 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 corrosive elements is constant. The fully threaded design ensures maximum grip length while the standardized 82° countersink angle allows for flush mounting in precision assemblies. Engineered to ASME B18.6.3 specifications, these fasteners provide reliable performance in structural applications requiring 70,000 psi tensile strength and consistent dimensional accuracy.

Specification Summary & Compliance

This 5/16"-18 UNC flat head screw maintains Class 2A thread fit tolerances per ASME standards, ensuring precise thread engagement and interchangeability. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety. The fully threaded configuration with coarse thread spacing provides optimal fastening performance in various industrial materials.