S-91500A587 5/16"-18 x 1 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated surface treatment
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for demanding industrial applications
• Reliable fastening performance ensured by Class 2A thread fit and UNC coarse thread spacing that prevents loosening under vibration
• Full-length threading provides maximum grip and load distribution across the entire fastener length
• Precision flat head design with 82° countersink angle creates flush surfaces for streamlined assemblies
• Industry-standard compliance with ASME B18.6.3 specifications guarantees dimensional accuracy and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use across global markets

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical corrosion protection where standard fasteners fail. The passivated finish creates an additional protective oxide layer, making them ideal for marine equipment, chemical processing plants, and food processing machinery exposed to moisture and corrosive agents. The UNC coarse threading with Class 2A fit ensures quick installation and vibration resistance in high-stress assemblies. With 70,000 psi tensile strength, these fully threaded screws maintain structural integrity in heavy-duty applications while the flat head design provides clean, flush mounting surfaces. Engineered to ASME B18.6.3 standards, they offer reliable performance in industrial maintenance, OEM manufacturing, and infrastructure projects requiring durable, corrosion-resistant fastening solutions.

Specification Summary & Compliance

This 5/16"-18 UNC flat head Phillips screw features precise Class 2A thread fit per ASME B18.6.3 specifications, ensuring dimensional accuracy and proper engagement. The manufacturing process adheres to ASME B18.6.3 standards for consistent quality and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. The combination of 316 stainless steel material, passivated finish, and standardized threading provides reliable performance across industrial applications requiring corrosion resistance and mechanical strength.