S-91253A635 3/8"-16 x 2 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
- Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments
- Exceptional load-bearing capacity with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
- Optimized flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
- Enhanced installation efficiency with 7/32" hex drive providing secure tool engagement and torque transmission
- Reduced material stress through partial threading design that maintains shank strength in high-stress applications
- Comprehensive regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These 3/8"-16 UNC flat head screws deliver critical engineering solutions where high-strength fastening and flush surface requirements intersect. The black-oxide alloy steel construction provides essential corrosion protection while maintaining the 130,000 psi tensile strength needed for structural applications. The Class 3A thread fit ensures precise engagement in UNC coarse threading, preventing loosening under vibration in machinery, heavy equipment, and construction assemblies. The 82° countersink angle allows perfect flush mounting in steel frames, machinery housings, and structural components where surface protrusion is unacceptable. With partial threading maintaining shank integrity, these industrial screws effectively distribute stress concentrations in high-load applications.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse thread specifications (3/8"-16). The 2 3/4" length with 1 1/4" minimum thread length provides optimal engagement depth. These flat head screws comply with ASTM F835 mechanical properties and dimensional requirements, while meeting RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for hazardous substance restrictions.
