S-91253A715 1/2"-13 x 1 3/8" 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
- Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance from black-oxide coating protects against environmental degradation in demanding conditions
- Precision Class 3A thread fit provides secure, vibration-resistant connections with minimal play
- Optimized hex drive design (5/16") enables high-torque installation without stripping or cam-out
- 82° countersink angle creates flush mounting surfaces for clean, professional finishes
- Full threading along the entire 1-3/8" length maximizes engagement and load distribution
- Rockwell C39 hardness maintains structural integrity under repeated stress and heavy loads
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws with 1/2"-13 UNC coarse threading deliver critical engineering advantages for industrial assembly challenges. The combination of high tensile strength (130,000 psi) and Class 3A thread precision addresses common failure points in heavy machinery, structural frameworks, and equipment manufacturing where vibration resistance and load-bearing capacity are paramount. The hex drive configuration prevents tool slippage during high-torque installation, while the 82° countersink angle ensures seamless integration into precision-machined components. These fully threaded fasteners maintain consistent clamping force across the entire engagement length, making them ideal for applications requiring uniform stress distribution in construction, automotive, and industrial machinery sectors.
Specification Summary & Compliance
Manufactured to exact inch system specifications with Class 3A thread fit and UNC coarse threading (1/2"-13). Complies with ASTM F835 standards for mechanical properties and performance requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use in regulated industrial applications worldwide.
