S-91263A559 1/4"-20 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
- Superior corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- Exceptional holding power from 130,000 psi tensile strength alloy steel construction for heavy-duty applications
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
- Optimized flush installation featuring an 82° countersink angle and flat head design for seamless surface finishing
- Enhanced installation efficiency with hex drive design allowing high-torque application without cam-out issues
- Long-term reliability backed by Rockwell C39 hardness for maintained performance under repeated stress
- Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These zinc-plated alloy steel flat head screws deliver critical engineering solutions where surface flushness and high-strength fastening are paramount. The UNC coarse threading with Class 3A fit provides superior engagement in various materials while resisting vibration-induced loosening - a common failure point in machinery and structural assemblies. The 82° countersink angle ensures perfect seating in prepared holes, eliminating protrusions that could interfere with moving components or finished surfaces. With 130,000 psi tensile strength and Rockwell C39 hardness, these fully threaded screws maintain integrity under extreme loads, making them ideal for heavy equipment, automotive frameworks, and industrial machinery where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with 1/4"-20 UNC coarse thread and Class 3A thread fit tolerance. These flat head screws comply with ASTM F835 specifications for mechanical properties and performance. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they meet international standards for restricted substances in industrial applications.
