S-91771A619 3/8"-16 x 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement through Class 2A thread fit and UNC coarse threading ensures secure fastening and vibration resistance
• Optimized flush mounting with undercut flat head design and 82° countersink angle for seamless surface integration
• Efficient installation with Phillips No. 4 drive providing positive torque control during assembly
• Full-thread engagement capability across the entire 1/2" length for maximum holding power in various material thicknesses
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine, food processing, and outdoor industrial equipment. The undercut flat head profile with 82° countersink angle ensures perfect flush seating without material protrusion, while the coarse UNC threading offers superior pull-out resistance in softer materials and faster installation times. The combination of 80,000 psi tensile strength and fully threaded design provides uniform stress distribution, preventing joint failure in high-vibration applications such as machinery assembly, electrical enclosures, and structural frameworks.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent mating with corresponding nuts and tapped holes. These flat head screws comply with ASME B18.6.3 mechanical and dimensional specifications, ensuring interchangeability and reliability in industrial applications. The products are fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) certified, meeting the latest environmental regulations for hazardous substance restrictions. The UNC coarse thread pattern with 3/8"-16 specification provides optimal performance in most industrial fastening scenarios.