Description
The 5/8"-11 Flat Head Cap Screw is a heavy-duty, flush-mount fastener engineered for industrial, mechanical, and structural applications where both high strength and a smooth surface finish are critical. Designed with an 82° countersunk flat head and an internal hex socket, this fastener supports precise torque control and strong clamping force while sitting flush with the mounting surface, minimizing obstruction and interference.
Specifications
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Thread Size: 5/8"-11 (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 1" to 5")
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Material: Alloy steel; also offered in stainless steel, zinc-plated, or black oxide 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 Installation: The countersunk flat head design ensures a smooth, level surface when installed, ideal for safety, aesthetics, or clearance-restricted areas.
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High Strength Profile: The 5/8" diameter with coarse 11 TPI thread delivers exceptional tensile and shear performance for heavy-duty applications.
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Controlled Torque Application: The internal hex drive provides reliable, slip-resistant torque control in both manual and power-driven installations.
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Corrosion-Resistant Finishes: Stainless steel and coated options provide long-term durability in outdoor, high-moisture, or chemically exposed environments.
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Secure Fit: UNC threading ensures consistent, vibration-resistant engagement with tapped holes or compatible nuts.
Typical Applications
The 5/8"-11 Flat Head Cap Screw is ideal for heavy-load, flush-mounted assemblies in demanding environments, such as:
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Structural Steel and Machinery Base Plates
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Industrial Equipment Mounting
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Safety Guards and Counterbored Panels
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Off-Road and Agricultural Machinery
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Tooling Fixtures and Heavy-Duty Jigs
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Marine and Outdoor Structures (in stainless steel)
