S-91253A866 5/8"-18 x 1" 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 load-bearing capacity with 130,000 psi tensile strength for heavy-duty applications
- Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant connections
- Optimized flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
- Enhanced torque transmission through 3/8" hex drive design for secure installation and removal
- Full threading coverage along the 1" length for maximum grip and uniform stress distribution
- Industry compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
Engineered for high-stress industrial applications, these black-oxide alloy steel flat head screws deliver exceptional performance in machinery assembly, structural frameworks, and heavy equipment manufacturing. The UNF fine thread configuration provides superior resistance to vibrational loosening, while the Rockwell C37 hardness ensures durability against wear and deformation. The 82° countersink angle enables flush mounting in precision components, eliminating protrusions that could interfere with moving parts. With hex drive compatibility and Class 3A thread fit, these screws offer reliable installation in critical joints where failure is not an option, making them ideal for automotive, aerospace, and industrial machinery sectors requiring high-tensile fastening solutions.
Specification Summary & Compliance
Manufactured to precision inch system dimensions with Class 3A thread tolerance for superior fit and performance. Complies with ASTM F835 specifications for mechanical properties and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features UNF fine thread with 18 TPI spacing and right-hand threading for standard industrial applications.
