What's inside
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The short answer
For most cabinet fitting, carry four bench chisels: 6 mm (¼ in), 12 mm (½ in), 19 mm (¾ in), and 25 mm (1 in). If you want to keep the kit small, the 6, 12, and 25 mm sizes will handle most hinge, lock, and trim work, with the 12 mm doing the most duty.
Choose sizes in millimetres or inches according to the hardware and plans you work from; the nearest sizes are close enough for general fitting. What matters more is having a blade narrow enough for corners and a wider blade that can pare a flat surface without taking forever. A set of bench chisels can be a sensible buy if its sizes match your work and you can sharpen them properly.
Why width matters when fitting cabinets
Cabinet work usually involves small, controlled cuts rather than chopping out large joints. You may need to pare a hinge recess to its final depth, square the corners of a strike-plate mortise, trim a proud edge band, or ease a tight drawer front. A chisel that is too wide is awkward in a tight corner; one that is too narrow makes a broad, flat recess slow to clean up.
Width is not the only consideration. A sharp, flat-backed chisel can pare accurately across a surface, while a blunt edge can tear veneer or skid across the work. Keep the cutting edge square and the back polished enough for registration. For fitting work, remove material in thin passes. A deep cut made in one go can split a rail or break through a cabinet side.
Useful widths and what they do
| Width | Best use | Limit |
|---|---|---|
| 6 mm (¼ in) | Small hinge corners, narrow grooves, tight hardware clearances | Slow for broad recesses; easy to dig too deep |
| 12 mm (½ in) | General fitting, hinge work, cleaning corners and paring edges | May need several passes on wide hardware |
| 19 mm (¾ in) | Medium hinge leaves, strike plates, broad paring | Too wide for some narrow corners |
| 25 mm (1 in) | Wide hinge leaves, trimming shoulders, cleaning flat areas | Clumsy in narrow recesses; needs good control to avoid bruising adjacent wood |
These are working sizes, not a rule that every cabinetmaker must follow. Measure the hardware before cutting. A 3 in hinge leaf is about 76 mm long, but that does not mean the recess should be cut with a 76 mm chisel: use a suitable width to pare the long edges, then square the ends with a narrower tool.
A practical minimum kit
If you are buying individually, start with 12 and 25 mm. Add a 6 mm when you regularly fit small hinges or narrow hardware, and a 19 mm if you do enough medium-width work to justify it. This combination gives you a narrow edge for corners and a broad edge for levelling, without carrying a full rack of sizes.
For occasional cabinet installation, an inexpensive but reasonably straight set is usually fine. You are fitting hardware, not necessarily chopping joints all day. Check that the blades are not visibly twisted, the handles are secure, and the backs can be brought flat near the edge. A bargain set that needs an hour of flattening on every blade may cost more in setup time than a modestly better one. A selection of individual bench chisels lets you buy only the widths you will use.
Fitting hinges and hardware without overshooting
Mark the outline with a sharp knife where the finish or veneer is likely to chip. Score the perimeter first, then remove waste from the middle in shallow layers. For a hinge recess, make a series of light cuts to the marked depth rather than driving the chisel down at the edge of the line. Stop short of the final depth, check the fit, and pare the last fraction of a millimetre.
Work with the bevel toward the waste when you need to control a cut near a boundary; use the flat back against a reference surface when paring to a clean plane. Keep the blade supported and your free hand behind the cutting edge. A mallet is useful for chopping a defined cut, but hand pressure is often better for final paring. If the hinge sits proud, remove a thin shaving from the recess. If it sits too deep, the fix is less tidy: you may need a veneer shim or a new screw position.
When to add other sizes
Add a 3 mm or 4 mm chisel only if you routinely work on small catches, narrow slots, or fine repairs. These blades are easy to bend or chip if used as pry bars, and they are not substitutes for a screwdriver or a small saw. For larger cabinet work, a 32 mm chisel can speed broad paring, but it is often unnecessary in a basic installation kit.
A firmer, bevel-edge bench chisel is the useful general-purpose type for this work. Keep a separate, inexpensive chisel for scraping dried glue or other jobs that might damage a keen edge. Do not use a cabinet-fitting chisel to lever a hinge leaf into place: sideways force can roll the edge or loosen the handle. For daily site use, a chisel roll protects the edges in a tool bag and keeps narrow blades from knocking against wider ones.
Keep the edges ready
Sharpness matters more than having every width. A dull chisel needs more force, is harder to steer, and is more likely to crush veneer instead of slicing it. Hone the bevel and remove the wire edge before a fitting job; touch up the edge as soon as it starts needing extra pressure. Store chisels with their edges covered, and do not leave them loose against screws, nails, or other steel tools.
Before buying a larger set, look at the hardware you actually fit and the clearances you encounter. If most jobs involve standard hinges, 6, 12, 19, and 25 mm cover a useful range. If you mainly adjust doors and drawer fronts, a sharp 12 mm chisel may see more use than the rest. Buy the next width when the work gives you a clear reason, not simply to fill out the rack.