S-91263A193 3/8"-16 x 2 1/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh industrial environments
• Exceptional load-bearing capacity with 120,000 psi tensile strength to withstand high-stress applications without failure
• Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance in critical assemblies
• Optimized flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
• Enhanced installation efficiency through 7/32" hex drive design allowing high-torque application with standard tools
• Reliable partial threading providing superior clamping force distribution across the 2 1/4" length
• Industry compliance assurance meeting ASME B18.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw delivers critical engineering solutions for industrial applications requiring both high-strength fastening and flush surface profiles. The zinc-plated alloy steel construction provides essential corrosion protection in manufacturing environments, while the Rockwell C32 hardness ensures thread integrity during repeated installations. The coarse UNC threading enables rapid assembly in production lines, and the partial threading design concentrates clamping force where needed most. Particularly valuable in machinery assembly, structural frameworks, and equipment manufacturing, this hex drive screw combines the installation efficiency of power tools with the reliability demanded by heavy-duty fastening applications, making it ideal for automotive, construction, and industrial machinery sectors.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit for superior engagement and 2 1/4" length with minimum 1 1/4" thread length. The screw features UNC coarse threading (3/8"-16) with 82° countersink angle and 0.781" head diameter. Full compliance with ASME B18.3 manufacturing specifications, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) chemical safety regulations ensures suitability for global industrial applications.