S-91253A252 10-24 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
- Superior corrosion resistance with black-oxide coating on alloy steel for extended service life in demanding environments
- Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
- Optimized flush mounting with standard 82° countersink angle and flat head design for smooth surface finishing
- Enhanced torque transmission through hex drive design prevents cam-out during installation
- Reliable partial threading provides superior clamp force control in precision engineering applications
- Full regulatory compliance with ASTM F835, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These 10-24 UNC flat head screws deliver critical performance advantages in industrial fastening applications where high tensile strength and corrosion resistance are paramount. The black-oxide alloy steel construction provides superior protection against environmental degradation while maintaining Rockwell C39 hardness for repeated use in heavy machinery, automotive assemblies, and structural frameworks. The partially threaded design with coarse thread spacing ensures optimal stress distribution, preventing material fatigue in high-vibration environments. The hex drive system combined with the 82° countersink angle enables flush installation in precision equipment, reducing protrusion issues while maintaining structural integrity under 130,000 psi load conditions.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread specifications, these 1-3/8" flat head screws guarantee precision mating in industrial assemblies. The products fully comply with ASTM F835 manufacturing standards and demonstrate adherence to international environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring suitability for global supply chains and environmentally conscious manufacturing operations.
