How to Sharpen a Serrated Knife

The Serrated Knife

The ‘lowly’ serrated knife.

Bread Knife with a Loaf

A Serrated Bread Knife with a Loaf

It sits alone in the knife block, waiting for a job and then, whenever it is used for a big job, it is put away and forgotten. Most people don’t even know that the serrated knife can be used for applications other than for slicing bread. And sharpening – when was the last time that you remember sharpening your serrated knife?

The serrated knife can be used for slicing type cuts, especially through tough or hard surfaces, since the serrations tend to grab and hold the tough surfaces. The serrated knife is the only knife in the kitchen which will still perform when dull – a function of the blade arrangement. But, this ability is also the knife’s downside – since it never seems to get dull, it is often overlooked for sharpening.

According to the website, the serrated edge gets its slicing ability from a number of factors. The high points of the serrations touch the material first, giving those points higher pressure per area than if the same pressure was applied to a plain blade. This allows the serration to puncture more easily. Additionally, serrations are typically chisel-ground into the blade, meaning they are thinner (and thus cut better) than the comparable plain blade.  Chisel-ground just means that one side of the blade is sharpened to an angle, like 25º and the other is flat.  Thus, serrated knives can be purposed for tasks other than bread – tough skinned fruit such as melon and other whole citrus fruits, moist, soft cakes, and even tomatoes! Tomatoes are best sliced with a serrated knife because a smooth bladed chef’s knife (the one that is never sharp enough) will succeed in only smashing the soft skinned tomato meanwhile the serrated knife blade with slice through it like butter.

When the time comes for sharpening, the serrated knife requires a special sharpener. The serrated knife sharpener sharpens each serration separately.


The Sharpening website recommends the following -

• choose a serrated knife sharpener with a grit size applicable to the job. This can be extra fine, fine, medium, coarse, or ceramic. The fine grit will provide a good cutting edge and will sharpen at a good rate, for most knives The coarse grit is optional for a faster sharpening rate on very dull serrated knives. The extra-fine and ceramic grits will provide a polished edge.  We recommend using the coarse first, then the medium, and last the fine sharpener for a typical serrated knife.

• Next, match  the cone diameter of the sharpener to the size of the gullet (the serration). The sharpener is wide at the base and tapers as it goes off to match the serrations.

• Using short, light, back and forth strokes, sharpen the beveled edge of each individual serration. After a few strokes, feel for a burr on the backside of the knife. Once you can feel the burr, move on to the next serration.

* Note: The key to getting your knife sharp, besides finding the proper angle, is ‘drawing a burr’ from each side of the knife. A burr is formed during the knife sharpening process as metal is drawn up and up over the edge of the tip of the knife. It can also be felt on the opposite side that you are sharpening on by running your thumb, carefully, up and across the edge. The burr is important because it shows you are making progress and that you are sharpening in the correct location. It also shows that you are actually moving old and fatigued steel from the knife.


• Once all the serrations are sharpened, flip the knife over and lightly grind the burr off with a smooth, light flat stroke.

Your knife should now be properly sharpened and ready to cut many more items now than just bread!

Check out this youtube instructional video by expertvillage:

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