S-91253A334 5/16"-24 x 7/8" 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, extending service life in demanding industrial environments
- Exceptional thread precision with Class 3A fit ensures reliable, vibration-resistant fastening in critical applications
- High tensile strength (130,000 psi) provides maximum load-bearing capacity for heavy-duty assemblies
- Optimized 82° countersink angle creates flush surface finishes while maintaining structural integrity
- Full threading design delivers consistent engagement along the entire 7/8" length for uniform stress distribution
- Hex drive compatibility enables secure installation with standard 3/16" tools, reducing assembly time
- Comprehensive compliance with ASTM F835, RoHS 3, and REACH ensures regulatory acceptance for global projects
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws with 5/16"-24 UNF fine threads deliver critical performance advantages in precision engineering applications. The Class 3A thread fit provides tighter tolerances than standard fasteners, eliminating backlash in machinery, automotive, and aerospace assemblies where vibration resistance is paramount. The fully threaded right-hand design ensures maximum engagement in thin materials and tight spaces, while the 82° countersink angle facilitates seamless flush mounting in precision-machined components. With Rockwell C39 hardness and 130,000 psi tensile strength, these screws maintain clamping force under extreme loads, preventing joint failure in critical structural applications.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with precision Class 3A thread fit per UNF standards, ensuring consistent performance across industrial applications. The black-oxide alloy steel construction meets ASTM F835 specifications for mechanical properties and surface treatment. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making these screws suitable for international projects requiring strict chemical substance controls.
