Description
The 1/2"-13 Flat Head Cap Screw is a heavy-duty, flush-mount fastener designed for structural, mechanical, and precision assemblies where a strong hold and a clean surface finish are essential. Featuring an 82° countersunk flat head and internal hex socket drive, this screw enables reliable torque application while remaining flush with the work surface—ideal for applications where clearance, safety, or aesthetics are critical.
Specifications
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Thread Size: 1/2"-13 (Unified National Coarse)
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Head Type: Flat head with 82° countersink and internal hex drive
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Drive Type: Hex socket (Allen)
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Length: Available in standard lengths (typically from 3/4" to 6")
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Material: Alloy steel; also available in stainless steel, black oxide, or zinc-plated finishes
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Finish Options: Black oxide, plain, zinc-plated, or stainless
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Grade: Typically Grade 8 (hardened alloy steel), or 18-8 / 316 stainless steel for corrosion resistance
Key Features
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Flush Countersunk Design: The flat head sits even with or below the surface for a snag-free, professional finish—ideal for safety-critical or low-clearance areas.
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High Load Capacity: The 1/2" diameter and 13 TPI coarse thread provide strong tensile and shear resistance for heavy-duty fastening.
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Internal Hex Drive: Allen socket allows for precise, controlled torque application, reducing the risk of tool slippage or head stripping.
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Corrosion-Resistant Options: Multiple material and finish options available to suit industrial, outdoor, or marine-grade environments.
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Standardized Fit: UNC threading ensures consistent compatibility with tapped holes or high-strength fastener systems.
Typical Applications
The 1/2"-13 Flat Head Cap Screw is ideal for heavy-duty flush-mounted assemblies in demanding environments:
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Machinery Frames and Base Plates
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Structural Brackets and Paneling
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Safety Covers and Counterbored Enclosures
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Automotive, Utility, and Off-Road Equipment
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Tooling Fixtures and Industrial Assemblies
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Construction Equipment and Frame Mounts
