S-91263A733 5/16"-18 x 1 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- Superior load-bearing capacity with 130,000 psi tensile strength for reliable performance in high-stress applications
- Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
- Easy installation and removal with 3/16" hex drive providing excellent torque transfer
- Optimal flush mounting with 82° countersink angle for smooth surface finishing
- Enhanced durability with Rockwell C39 hardness maintaining structural integrity under repeated use
- Full-thread coverage along the 1 3/4" length for maximum grip strength across the entire fastener
Professional Applications & Engineering Value
These zinc-plated alloy steel flat head screws deliver critical performance advantages for industrial assembly and machinery applications. The combination of UNC coarse threading and Class 3A thread fit ensures rapid installation while maintaining vibration resistance in dynamic environments. The 82° countersink angle provides flush mounting capability essential for applications where protruding fasteners could interfere with moving components or create safety hazards. With 130,000 psi tensile strength and Rockwell C39 hardness, these hex drive screws withstand extreme mechanical stresses in heavy equipment, structural frameworks, and automotive assemblies. The fully threaded design maximizes clamping force distribution, making them ideal for joining materials of varying thicknesses where uniform pressure is critical.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading (5/16"-18). These flat head screws meet ASTM F835 specifications for mechanical properties and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental responsibility and workplace safety. The 1 3/4" length maintains consistent thread engagement while the 0.656" head diameter provides optimal bearing surface for secure fastening applications.
