S-91771A644 3/8"-16 x 5" 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 for extended service life in harsh environments
• Exceptional tensile strength rated at 80,000 psi ensures reliable performance under heavy loads and vibration
• Precise countersinking capability with 82° flat head profile for flush mounting and clean aesthetic finish
• Optimized drive engagement through Phillips No. 4 drive design prevents cam-out and enables efficient installation
• Reliable coarse threading with UNC 3/8"-16 pattern provides superior holding power in various materials
• Controlled thread engagement through partially threaded design prevents over-tightening and material damage
• Industry compliance assurance meeting ASME B18.6.3 standards for consistent quality and dimensional accuracy

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 3/8"-16 UNC flat head screws deliver exceptional value through their passivated 18-8 stainless steel composition, providing superior corrosion resistance that withstands exposure to moisture, chemicals, and environmental elements. The 82° countersink angle ensures perfect flush mounting in machinery, equipment frames, and structural assemblies, eliminating protrusions that could interfere with operation or safety. The coarse thread design offers excellent pull-out resistance in wood, plastic, and soft metals, while the partially threaded configuration provides controlled clamping force distribution. These features make them ideal for industrial machinery, marine equipment, food processing systems, and outdoor structures where reliability and longevity are critical.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications, these flat head screws maintain precise Class 2A thread fit tolerances for consistent engagement and reliable fastening performance. The UNC 3/8"-16 coarse thread pattern ensures compatibility with standard industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across various industries, while the Rockwell B80 hardness rating ensures durability against wear and deformation during installation and service.