S-91781A168 1-72 x 3/8" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ensuring longevity in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under high stress
• Precise thread engagement with Class 2A fit and UNF fine threads, providing secure fastening and vibration resistance
• Full threading design offers maximum grip along the entire shank length for enhanced load distribution
• Standard flat head profile with 82° countersink angle enables flush mounting for clean, aerodynamic surfaces
• Right-hand thread direction ensures compatibility with standard assembly procedures and tooling
• Regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards for guaranteed quality and environmental safety

Professional Applications & Engineering Value

These 1-72 UNF flat head slotted screws deliver exceptional engineering value in precision applications where space constraints and material compatibility are critical. The 18-8 stainless steel construction combined with passivated finish provides outstanding corrosion resistance, making them ideal for marine, chemical processing, and food-grade equipment where moisture and corrosive agents are present. The fine thread spacing and Class 2A thread fit ensure superior vibration resistance in machinery, electronic enclosures, and aerospace components. The flat head design with standard profile allows for flush mounting in countersunk holes, creating smooth surfaces essential for aerodynamic applications and preventing snagging in moving assemblies. These fully threaded screws distribute clamping force evenly, preventing joint loosening in high-vibration industrial environments.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications, these screws feature precision Class 2A thread fit with UNF (Unified National Fine) thread type measuring 1-72 size. The dimensional accuracy includes 0.073" thread diameter, 3/8" length, and standard 82° countersink angle. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and restricted substance adherence. Mechanical properties are verified at 80,000 psi tensile strength and Rockwell B80 hardness, guaranteeing consistent performance across industrial applications.