How to Drill Magnets- A Step-by-Step Guide

The role magnets play in our day-to-day lives cannot be understated. However, some situations demand individualized magnetic solutions and this is where magnet drilling comes into play.

Can You Drill a Magnet?


Drilling or piercing a hole in a magnet has been known to have various negative implications on the magnet. Reduction in magnetic forces and even complete demagnetization have been touted as some of the severest consequences.

However, with the right know-how and precision, it is possible to drill a magnet. With the ideal drill and requisite liquid coolant, specialists can drill magnets without depriving them of their magnetic capabilities.

Magnets with Holes
Magnets with Holes

This endeavor is however risky and it demands precision and experience to avert demagnetization. During production, the magnets are drilled before being magnetized. This is to avoid the scrambling of aligned magnetic domains. That is why, today, magnet manufacturers offer magnets with pre-drilled holes such as ring magnets and countersunk hole magnets. This provides a viable alternative to magnet drilling.

Tips for Drilling Magnets

Magnets are generally brittle and their material can pose significant health threats. This underlines the need for caution during drilling. Here are a few tips that will definitely come in handy when drilling magnets.

  • First, settle on the right type of magnet. Some magnets are quite fragile, for instance, ceramic magnets while others such as NdFeB magnets are stronger and less prone to breakages.
  • Mark the desired hole locations. Having accurate markings that depict the exact location and measurement of the desired hole will help avoid mistakes when drilling.
  • Choose the Correct Drill Bit. Numerous drill bits can be employed to drill a magnet. Some of the most recommended included diamond-tipped bits and cobalt bits.
  • Do not forget to use a coolant during the drilling process. The coolant avoids friction and averts overheating, which can cause demagnetization.
  • Drilling should be undertaken at a slow speed and gently. This is because relatively higher speeds and more pressure are likely to cause cracking or breakage.
  • Employ the pecking technique. This technique involves drilling at intervals while taking breaks to extract any formed debris before resuming the drilling process.
  • After puncturing the magnet, clean the debris by wiping it off. Also, inspect the monitor to check for any unintended breakages.

Drill Bits Suitable for Drilling Magnets

Magnet drilling is a sensitive and very demanding task hence why care and caution must be undertaken. Part of this care begins with the selection of an ideal magnet drill. Here are some of the leading drill bits designed for magnet drilling:

  • Diamond-Tipped Drill Bits: These drill bits have a tip made of diamond, which qualifies their application in puncturing hard objects. They are perfect for magnet drilling given that they can cut through fragile objects without causing breakages.
  • Cobalt Drill Bits: Cobalt drill bits are engineered to withstand high heat as well as extreme hardness levels. They are prominently utilized to drill magnets because they retain their sharpness even at high speeds.
  • Carbide Drill Bits: Carbide is essentially a strong and rigid material, making it perfect for drilling magnets. Carbide drill bits are revered in magnet drilling and they are available in multiple designs.

Step-by-step Guide to Drilling Holes on Magnets

Drilling holes in magnets is a complex and demanding exercise that necessitates high-level expertise and equipment. A very elaborate process must be followed to ensure that the drilled magnets exhibit exceptional magnetic properties. Here is a step-by-step guide on how to properly drill magnets:

Drilling Through Magnets
Drilling Through Magnets

Step 1: Magnet Preparation

First, the necessary steps needed to prepare the magnets for drilling are taken. These steps include proper sizing and shaping of the magnets, cleaning as well as marking the desired locations of the holes. The magnets are also positioned appropriately in vases or holding containers to avoid shake-ups, which can cause breakages.

Step 2: Tool Selection

There is a variety of drilling tools to choose from. However, there are drilling tools and drill bits that are designed to favor magnet drilling. They include diamond-tipped bits and cobalt drill bits. When selecting drilling tools and bits, factors such as magnet material hardness and the desired depth of the holes must be considered.

Step 3: Drilling Set-Up

With the magnets and necessary tools in place and ready for drilling, the drill machine is calibrated to the specifications outlined in the design. This is done with great precision to guarantee accurate hole placement and sizing. Settings that are adjusted include the drill bit speed and angle.

Step 4: Actual Drilling

After all the preparations are done, the drilling machine is switched on and the drill bit is slowly and gently lowered towards the magnet’s surface. The drill bit then pierces through the magnet at the designated point. The diameter and depth of the hole drilled depends on the design specifications given.

Step 5: Cooling

Due to the constant spinning of the drilling bit, there is bound to be friction and heat. This can cause the loss of magnetization or even breakages hence it is important to apply a coolant or lubricant during the drilling process. The lubricant or cooling liquid is precisely applied on the drill bit and the surface of the magnet.

Step 6: Cleaning

Once the drilling process is concluded and the holes are perfectly drilled, the magnets are cleaned thoroughly. This stage is paramount as it gets rid of the resulting debris as well as the coolant or lubricant used.

Step 7: Inspection and Quality Control

The drilled magnets are consequently subjected to a thorough inspection aimed at addressing any unforeseen defects. During this process, the magnets are also closely monitored to ensure they meet the specified design provisions.

Post-Drilling Care for Magnets.

Drilling a hole into a magnet can affect its performance by interfering with its structural integrity. As such, it is vital that the drilled magnets are handled with care to maintain their optimal magnetic capabilities.

Proper Storage

After drilling the magnets, they should be preserved in favorable conditions that do not put their magnetic properties at risk. The magnets should not be piled together as this can lead to breakages caused by the weight load. Additionally, they should be stored in a cool and dry setting.


The heat and friction experienced during drilling may decrease the magnetic strength of the magnets or even completely erode their magnetism. In the event of magnetization loss, the magnets can be exposed to stronger external fields or re-magnetized using a current.

Anti-Corrosion Coating

The hole created by the drilling process may be vulnerable to corrosion hence it is important to apply an anti-corrosive coating. The coating can be made of nickel or any other corrosion-resistant material.

Proper Mounting

 Magnets are mainly drilled to ease the process of mounting them on surfaces with unique designs. Properly mounting the magnets per the manufacturer’s instructions helps prevent breakages and also maintains their magnetic capabilities.

Safety Precautions When Drilling Rare Earth Magnet

If cautionary measures are ignored when drilling rare earth magnets, the personnel working on the magnets as well as the magnets being drilled can be exposed to great danger. Here are a few safety precautions to consider when drilling magnets:

  • Have the personnel wear face shields or goggles to protect their eyes from the magnetic particles emitted during drilling.
  • Have the personnel put on dust masks to avert inhaling the magnetic debris.
  • Have the workforce wear fitting hand gloves to protect their hands from heat and sharp edges.
  • Always use the right drilling tools.
  • Before drilling commences, the magnets should be securely and tightly held to avoid movement.
  • Any resulting waste should be discarded in accordance with the prevailing disposal regulations as stipulated by the local authorities.
Bar Magnets with Holes
Bar Magnets with Holes

Implications of Drilling a Permanent Magnet

Drilling permanent magnets has its positives which include customization to fit specific surfaces and easy installation. However, this procedure can have several negative implications if not well implemented. Some of these implications include:

  • Loss of corrosion resistance.
  • Magnet cracking or breaking.


Drilling magnets further amplifies their applications. It makes mounting magnets onto tricky surfaces easier and opens up unforeseen possibilities. However, magnet drilling is not a straightforward task. It demands lots of care, expertise, and precision.

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