Description
The #4-40 Socket Head Cap Screw is a micro-diameter, high-precision fastener designed for compact assemblies where space, strength, and secure torque application are critical. Featuring a cylindrical socket head with an internal hex drive, this screw allows for flush installation in tight or recessed areas, making it ideal for electronics, instrumentation, and light mechanical devices.
Specifications
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Thread Size: #4-40 (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 1/8" 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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Compact and Strong Head: The small cylindrical head offers maximum strength in a minimal footprint, perfect for limited-space designs.
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Fine Thread Engagement: The #4-40 thread pitch provides secure, vibration-resistant fastening in thin materials or precision tapped holes.
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Controlled Torque Application: The internal hex drive enables accurate, slip-resistant tightening in delicate or critical assemblies.
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Material Versatility: Available in corrosion-resistant and high-strength finishes for durability in electronics and light mechanical applications.
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Miniature Design with Performance: Combines small size with dependable clamping force, ideal for micro-assembly work.
Typical Applications
The #4-40 Socket Head Cap Screw is ideal for miniature and precision-based assemblies, such as:
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Circuit Boards and Electronics Enclosures
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Instrumentation and Lab Equipment
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Robotics, Drones, and Small Mechanisms
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Prototyping and 3D Printed Assemblies
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Aerospace and Avionics Hardware
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Custom Brackets and Precision Fixtures
