S-91253A597 5/16"-18 x 3 1/4" 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 tensile strength (130,000 psi) ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance through black-oxide coating extends service life in demanding environments
- Precision Class 3A thread fit provides secure fastening with minimal vibration loosening
- Rockwell C39 hardness rating maintains structural integrity under repeated loading conditions
- 82° countersink angle design enables flush mounting for cleaner aesthetic finishes
- 3/16" hex drive compatibility offers familiar installation with standard industrial tools
- Partial threading configuration allows for optimal clamping force distribution
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws address critical challenges in machinery assembly, structural frameworks, and equipment manufacturing. The UNC coarse threading with Class 3A fit ensures rapid installation while maintaining vibration resistance in dynamic environments. The partially threaded design concentrates clamping force precisely where needed, preventing joint distortion. The black-oxide surface treatment provides essential corrosion protection without compromising dimensional accuracy, making these hex drive screws ideal for automotive, construction, and manufacturing sectors where reliability and compliance with ASTM F835 standards are paramount.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNC coarse threading (5/16"-18) and 82° countersink angle. These screws conform to ASTM F835 specifications for mechanical properties and dimensional requirements. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe usage across global industrial markets. The 3 1/4" length with minimum 1 1/8" thread engagement provides optimal fastening capability for various material thicknesses.
