Description
The 1/4"-20 Flat Head Cap Screw is a precision-engineered fastener designed for flush-mount installations in tight-tolerance assemblies. Featuring a countersunk flat head with an internal hex drive, this screw allows for smooth surface finishes and secure torque application in applications where aesthetics, safety, and clearance are critical.
Specifications
-
Thread Size: 1/4"-20 (Unified National Coarse)
-
Head Type: Flat head with 82° countersink and internal hex drive
-
Drive Type: Hex socket (Allen)
-
Length: Available in standard lengths (typically from 1/4" to 2-1/2")
-
Material: Alloy steel; also available in stainless steel, zinc-plated, or black oxide finishes
-
Finish Options: Black oxide, plain, zinc-plated, or stainless
-
Grade: Typically Grade 8 (alloy steel) or 18-8 / 316 stainless for corrosion resistance
Key Features
-
Flush-Mount Design: The 82° flat head design allows the screw to sit flush or slightly below the surface of the workpiece, ideal for countersunk holes.
-
Precise Torque Application: Internal hex drive enables consistent tightening without damaging surrounding material or fastener head.
-
Compact and Secure: Combines small diameter with reliable clamping force, suitable for space-constrained or precision assemblies.
-
Corrosion-Resistant Options: Stainless steel and coated variants offer enhanced durability in outdoor, humid, or corrosive environments.
-
Threaded for Strength: Standard 1/4"-20 UNC threading ensures compatibility with common tapped holes and nuts.
Typical Applications
The 1/4"-20 Flat Head Cap Screw is widely used in assemblies where flush mounting and precision alignment are essential:
-
Electronics Enclosures and Panels
-
Mechanical and Automotive Assemblies
-
Machine Guards and Counterbored Fastening
-
Aerospace and Instrumentation Mounting
-
Furniture, Fixtures, and Decorative Fastening
-
Robotics and Motion-Control Devices
