How to Sharpen Kitchen Shears

Sharpen kitchen shears the way you would sharpen two short knives that have to stay in contact: open the blades, lay a flat abrasive flush against the narrow bevel on the outsideface of one blade, stroke along it toward the outside of the shears, then rotate the pair 180 degrees and give the other blade the same treatment. Never abrade the flat inner faces. That is the whole method, and it is DMT’s own published sequence for scissors.

The reason this gets botched so often is that shears look like a knife and behave like a machine. A knife has one job: an apex that parts whatever it meets. A pair of shears has two edges that have to pass each other in continuous contact, shearing the food between them — which is why a pair can be perfectly sharp and still fold a chicken skin instead of cutting it. Sharpening is only one of the three things that can be wrong, and it is not the most common one.

First: is it actually dull?

Run this before you touch an abrasive. Close the shears slowly on a strip of printer paper, starting at the heel and working toward the tip.

• Cuts at the heel, slips at the tip. The pivot is loose. The blades are separating under load, so there is nothing to shear against. Tighten the pivot screw a little at a time until the blades move smoothly without flopping apart. No amount of sharpening substitutes for this.
• Feels gummy or sticky all the way along.Residue on the inner faces. Wash and dry the pair — by hand, because a dishwasher is hard on edges and on pivots for the same reasons the makers give for knives.
• You can see light glinting off flattened or nicked spots on the edge. That is wear or damage, and sharpening is the answer.
• There is a visible gap between the blades when closed. A blade is bent or the pivot is sprung. Sharpening will not close a gap; a cheap pair is finished and a good pair is a job for a repair service.

That diagnosis-first habit is the same one why knives get dull so fast argues for on knives: most of what people call dullness is something else, and grinding steel off is the one step you cannot undo.

The geometry that decides the method

Pick up a pair of kitchen shears and look at one blade end-on. You will see a narrow ground bevel on the outsideface — often quite wide and obtuse compared with a kitchen knife — and a flat, unbeveled inner face. The two inner faces are what ride against each other. That contact is the mechanism: the food is trapped between two edges moving past one another, not parted by a single apex.

Two rules fall straight out of that:

Rule one: only the outside bevel gets abraded.That is the surface that forms the cutting edge with the inner face, and it is the surface DMT’s instruction tells you to register against.

Rule two: the inner faces stay exactly as they are.Grind, strop or polish them and you remove material from the plane that keeps the blades touching. The result is a gap, and a pair of shears with a gap folds food. This is the single most common way an enthusiastic sharpener ruins a pair — usually by treating each blade as a tiny knife and giving it a bevel on both sides, the way our knife walkthrough describes for an actual knife.

DMT’s published sequence, and the detail worth noticing

We are leaning on DMT here because it is a sharpener maker that publishes per-tool instructions rather than general encouragement. Its scissors entry names the Diafold as the sharpener shown, with the Diafold Flat File, Mini-Hone or Mini-Sharp as alternatives, and gives three steps: align the sharpener flush with the bevel, “stroke smoothly toward outside of scissors,” then rotate the scissors 180° and repeat.

The detail worth noticing is the stroke direction, because DMT does not use the same one for every tool. For scissorsit says to stroke toward the outside of the scissors — along and off the bevel, away from the cutting edge. For pruners, one entry down, it says to “stroke into the bevel edge.” And on its guided knife instructions it says to “lightly stroke away from the body,” setting the clamp to the bevel angle, which it gives as “20° for most edges,” and to “progress to finer grits for the desired result.”

Those are three different instructions for three different jobs, from one maker, and the scissors one is deliberately the gentlest: stroking off the edge rather than into it raises less of a burr on a face you are not allowed to dress. Note also what DMT does notpublish for scissors: any angle in degrees. It does not need to, because “flush with the bevel” means the factory angle is the target. Its FAQ makes the governing point for all of this anyway — “sharpening at the proper angle is not as important as sharpening at a constant angle.”

What to sharpen them on

You need a flatabrasive wide enough to lay a bevel on, and that is the whole specification. DMT’s own scissors recommendation is one of its small folding tools, which is a sensible thing to keep in a drawer; what our registry carries is the bench-size equivalent, and a bench plate does the same job with more room to work.

One distinction matters when you pick a plate. An interrupted or “polka-dot” surface has recessed holes so debris falls away, which is excellent for knives and less good here, because a short bevel and a pointed shear tip can drop into a hole mid-stroke. DMT describes its Dia-Sharp plates as having a “continuous diamond surface” that “assures consistent, even sharpening every time” and says the sharpening surface “accommodates range of edges from large knives to small pointed tools” — which is exactly the case for using the continuous one on shears. It is also “guaranteed not to hollow or groove,” and flatness is the one property this job cannot do without.

On grit: DMT publishes its grades as Coarse 325 mesh (45 micron), Fine 600 mesh (25 micron) and Extra-Fine 1200 mesh (9 micron). Fine is the working grade for a pair that is merely dull. Reach for a coarse grade only if the edge is visibly nicked, and finish on something finer if you have it. The same coarse-to-fine logic applies on water stones, where a 1000-grit face does the work and a 3000 or 6000 refines it — our grit guide lays the scales out, and notes that they do not cross between systems.

The part nobody mentions: the pivot

Half of how a pair of shears feels is the pivot, and it is free to fix. A screw that has worked loose is the most common cause of a pair that “went blunt” overnight. Grit and dried food in the joint is the second. After sharpening, wash and dry the pair, put a single drop of food-safe oil on the pivot and work the blades through their full travel a dozen times. Then set the tension: tight enough that the blades stay in contact to the tip, loose enough that they close under their own weight when you hold the pair by one handle.

If your shears come apart — many kitchen pairs do, and the take-apart design exists precisely so the inner faces can be washed — use that. A single blade off the pivot lies on a plate like a short, wide knife, the bevel registers flat, and you can see what the abrasive is doing instead of guessing around the other handle.

Burr removal, which the shears do for you

On a knife, the burr — the thin wire of displaced steel that forms as you grind — has to be stripped deliberately, and failing to do it is why a freshly sharpened knife can die within a day. On shears you get most of it for free: open and close the pair a dozen times and make a few cuts through scrap paper, and the two blades shear the wire off each other as they pass.

What you must not do is “deburr” by running an abrasive or a strop along the inner faces. That is the same mistake as rule two above, dressed up as a finishing step. If a wire edge is still catching after a dozen closes, give the outside bevel one more very light pass instead.

When to stop and buy a new pair

Shears are cheap relative to knives, and three faults are not worth chasing: a bent blade, a sprung or worn-out pivot that will not hold tension, and ground-off micro-serrations on a poultry pair. In each case the geometry that makes shears work has gone, and an edge is not the missing piece.

One last honest note about this site: our registry carries no dedicated scissor sharpener and no folding flat file, so the picks above are the flat plates and stones we already cover, chosen for this job rather than invented for it. If you want a tool whose only purpose is scissors, DMT’s own small folding sharpeners are the ones its instructions name, and we would rather point you at that than pretend a product we track is something it is not. For the shears that arrive in a knife block — the sets where shears are the most-used piece in the box — see our set roundup, and knife care covers washing and storage for everything sharp in the drawer.