S-91253A536 1/4"-20 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
- Exceptional durability with 130,000 psi tensile strength and Rockwell C39 hardness, ideal for high-stress industrial environments
- Superior corrosion resistance from the black-oxide coating, extending service life in harsh conditions
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
- Efficient hex drive installation with 5/32" drive size for secure torque application and reduced tool slippage
- Optimal flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
- Full threading design provides consistent holding power along the entire 7/8" length for maximum load distribution
- Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 1/4-20 UNC flat head screws deliver critical performance where precision fastening and corrosion resistance are paramount. The black-oxide alloy steel construction combats environmental degradation in machinery, automotive, and structural assemblies, while the coarse thread and Class 3A fit prevent loosening under dynamic loads. The hex drive facilitates quick installation in confined spaces, and the 82° countersink ensures flush seating to eliminate protrusions. These fully threaded screws maintain uniform clamp force, making them indispensable for heavy-duty fasteners in vibration-prone equipment.
Specification Summary & Compliance
This flat head screw features precision UNC coarse threads with Class 3A fit for superior dimensional accuracy. Manufactured to ASTM F835 specifications, it guarantees consistent performance in tensile strength and thread integrity. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence for global supply chain compatibility.
