S-91253A172 6-40 x 3/4" 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
- Enhanced corrosion resistance with black-oxide coating on alloy steel for reliable performance in demanding environments
- Superior tensile strength rated at 130,000 psi ensures secure fastening under high-stress industrial applications
- Precise Class 3A thread fit with UNF fine threading delivers vibration-resistant connections and reduced loosening risks
- Optimized 82° countersink angle provides flush mounting for clean aesthetics and improved aerodynamics in assemblies
- Efficient hex drive (5/64") enables quick installation with standard tools while minimizing cam-out during torque application
- Full threading along 3/4" length allows maximum grip depth and adjustable positioning in varied material thicknesses
- Compliance with ASTM F835, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chains
Professional Applications & Engineering Value
Engineered for precision assemblies requiring flush surface profiles, these 6-40 UNF flat head screws solve critical challenges in electronics enclosures, aerospace components, and machinery frames. The black-oxide alloy steel construction combats oxidation while maintaining Rockwell C39 hardness to prevent thread deformation during repeated disassembly. Combined with fine thread spacing and Class 3A fit, the fastener resists vibrational loosening in dynamic systems. The hex drive design ensures torque integrity for high-production environments, making these screws ideal for automated installation processes where reliability and regulatory compliance (ASTM F835) are mandatory.
Specification Summary & Compliance
Manufactured to inch system dimensions with Class 3A thread tolerance per UNF standards, ensuring interchangeability. The fully threaded 6-40 configuration with right-hand direction maintains consistent engagement. Meets ASTM F835 mechanical properties, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) for chemical safety compliance.
