Description
The #5-40 Socket Head Cap Screw is a micro-diameter, precision-engineered fastener designed for applications where compact size, reliable torque control, and secure thread engagement are critical. With its cylindrical socket head and internal hex drive, this screw supports flush installation in counterbored holes—ideal for electronics, precision instruments, and light mechanical assemblies.
Specifications
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Thread Size: #5-40 (Unified National Fine)
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Head Type: Cylindrical socket head with internal hex drive
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Drive Type: Hex socket (Allen)
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Length: Available in standard lengths (typically from 3/16" to 1")
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Material: Alloy steel; also available 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 (for alloy steel), or 18-8 / 316 stainless for corrosion resistance
Key Features
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Miniature Cylindrical Head: Offers a strong, flush-mounted profile for compact or precision assemblies.
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Fine Thread Engagement: #5-40 thread provides excellent grip in thin or delicate materials and ensures vibration resistance.
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Hex Socket Drive: Internal hex drive allows precise torque application while minimizing the risk of tool slippage or head deformation.
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Durable Finishes: Stainless steel and coated versions provide long-term resistance to corrosion, wear, and environmental stress.
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Precision Fastening: Ideal for miniature hardware where standard screws are too bulky or intrusive.
Typical Applications
The #5-40 Socket Head Cap Screw is ideal for precision light-duty applications, such as:
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Compact Electronics and Circuit Board Mounting
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Instrumentation and Test Fixtures
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Robotics, Drones, and Mechatronics Hardware
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Medical Devices and Laboratory Equipment
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Control Panels and Miniature Assemblies
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Prototyping and 3D Printed Components
