The best drill bits for hard porcelain tile

Written by kimberley elliot
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Although porcelain and ceramic tile are often considered to be synonymous, they're made from different substances. Ceramic tile is composed largely of clay, which is mixed with minerals and water, then heated in a kiln. While it's also heated in a kiln, porcelain tile is mainly made with sand, and then heated at much, much higher temperatures than ceramic. As a result, porcelain tends to be harder than ceramic and much more difficult to drill through. The masonry bits that usually work with ceramic tiles won't always penetrate the denser porcelain tiles.

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Diamond bits

Diamonds are the hardest substances on earth, so it makes sense that diamond bits are the most effective when drilling through porcelain. The tips of these specially made bits are coated with tiny pieces of diamond, giving the bit the power to cut through rock.

Drill slowly

When using your diamond drill bit on porcelain, remember to go slowly, 100 to 200rpm, since too much speed will cause the bit to burn from too much friction. Go slowly, and use cutting oil every few seconds to keep the bit from overheating. The drill has to be held firmly since diamond bits are not designed to be used on any kind of angle. If the bit is not straight, it can crack the tile.

Masking tape holds the bit in place

To help hold the drill in the right position, put some masking tape over the spot you want drilled. It will help stop the drill from slipping on the glossy tile.

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