Flush Mounting, Mechanical Fixation
We offer custom Neodymium Magnets with Countersunk Holes.
Standard disc magnets rely on adhesives.
They can fail over time or peel off under load.
But Countersunk magnets are for Mechanical Fastening.
These magnets feature a precision-ground conical hole.
This allows a standard flat-head screw (wood screw or machine screw) to sit perfectly flush with the magnet’s face.
Creates a smooth, zero-profile surface.
Perfect for Cabinet Latches, Door Stops, and Shop Fitting Displays.
They require the magnet to be screwed securely into place.
Why Countersunk?
This shape transforms a raw magnet into a functional hardware component.
1. Zero-Profile (Flush Fit):
The Problem:
Using a standard ring magnet with a pan-head screw leaves the screw head sticking out.
This prevents the magnet from making full contact with the mating steel plate.
The Solution:
The 90° countersink creates a recess for the screw head.
The screw sits flush or slightly below the magnet surface.
Ensure 100% surface contact (maximum holding force) with the target metal.
2. The “Matched Pair” Strategy (Polarity):
The Confusion:
If you are using these for a Magnet-to-Magnet latch (e.g., a door closure), you need them to attract, not repel.
Our Solution: We supply these in Matched Pairs.
- Type A: North Pole on the countersunk face.
- Type B: South Pole on the countersunk face.
Result:
When you screw Type A to the door and Type B to the frame, they snap together perfectly.
Please note: If screwing to a steel plate, polarity does not matter.
Installation Advisory: “The Wedge Effect”
A countersunk magnet is NOT a steel washer.
It is a ceramic ring.
The Torque Warning:
The Physics:
Neodymium is brittle.
The tapered head of a countersunk screw acts as a Wedge.
The Risk:
Do not overtighten the screw.
Especially with a power drill.
The wedge forces the magnet outward, and cause it to crack or shatter instantly.
The Advice:
Always Hand-Tighten these magnets.
Do not use an impact driver.
We recommend using a small rubber washer or setting the torque very low to prevent cracking.
Hole Dimensioning:
The Fit:
The hole is typically ground to a Standard 90° Angle.
The Spec:
To ensure your screw fits, we need to define the Major Diameter (top of hole) and Minor Diameter (bottom of hole).
Ideal Applications
- Cabinetry / Joinery: Invisible door latches for kitchens and furniture.
- Shop Fitting: Mounting heavy shelves or signage that can be moved.
- Gate Latches: Heavy-duty outdoor closures.
- Jigs & Fixtures: Holding workpieces on a workbench (screwed down).
- Camera Mounts: Magnetic bases for lighting or cameras.
Ordering Guide: Precision Specs
To quote these accurately, please define:
1). Dimensions: Outer Diameter x Thickness.
2). Screw Size: “What screw are you using?” (e.g., M3, M4, M5, or #6 Wood Screw).
– It is safer to provide the screw size (e.g., M4).
– We will size the hole correctly.
3). Pairing:
– Do you need Matched Pairs (N/S) for magnet-to-magnet use?
– Or single polarity for magnet-to-steel use?
4). Quantity: Batch production recommended.
