S-91253A376 3/8"-24 x 3 1/2" 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 for extended service life in harsh industrial environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and vibration
- Precision Class 3A thread fit provides superior engagement and eliminates cross-threading risks
- Optimized flush mounting with 82° countersink angle creates smooth, professional finishes
- Enhanced drive stability through 7/32" hex drive prevents cam-out and tool slippage
- Controlled thread engagement with partially threaded design prevents over-tightening in critical applications
- Full regulatory compliance with ASTM F835, RoHS 3, and REACH standards for global market acceptance
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws deliver exceptional engineering value in demanding applications where corrosion resistance and high tensile strength are critical. The 3/8"-24 UNF fine thread spacing provides superior vibration resistance in machinery, automotive assemblies, and structural frameworks. The Rockwell C39 hardness rating ensures excellent wear characteristics, while the partially threaded design allows precise control over clamping force in critical joint applications. The 82° countersink angle facilitates perfect flush mounting in precision equipment and aerospace components, eliminating protrusions that could interfere with moving parts. These hex drive screws are engineered to maintain integrity in high-stress environments where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit standards with 3/8"-24 UNF fine threading and right-hand thread direction. The 3 1/2" length with minimum 1 1/4" thread length ensures proper engagement depth. Complies with ASTM F835 specifications for mechanical properties and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions.
