Cabinet Parts Explained: Box, Gables, Nailers, Fillers, and More

Cabinet shops speak in parts: gables, bottoms, stretchers, nailers, fillers, and toe kicks. Each name maps to a cut list row, a material choice, and a place in the nest. Mislabel a left gable as a shelf blank and you waste a sheet of pre-finished melamine before assembly starts.

This guide explains the major cabinet parts professional makers cut and assemble, how they differ between face-frame and frameless construction, and which optimizer mode each family uses. Use it as a floor and estimating reference alongside the full terminology guide.

For a dictionary-style index, see the cabinet terminology guide. For nesting those parts, start from the cabinet making hub.

The carcase (or cabinet box) is the structural shell. Doors, drawers, and hardware dress it. On a cut list, carcase parts dominate sheet nesting because they are large rectangles cut from melamine, plywood, or MDF.

Typical sheet parts: left and right gables (sides), bottom, top or stretchers, fixed and adjustable shelves, back, and nailers or hanging rails. Construction method changes which of those are full panels versus strips.

Gables are the vertical side panels of the box. In North American shop language, left and right gables define box height and depth. They are often the largest sheet parts on a base or tall cabinet and usually carry grain vertically on show ends.

Frameless gables often become the finished side when exposed. Face-frame gables may sit behind the frame and accept dados for bottoms and shelves. Either way, each box needs a matched left/right pair on the cut list.

• Base gable height commonly 34.5 in (876 mm) before countertop in NA kitchens
• Base gable depth commonly about 23.25 to 24 in depending on whether depth is finished outside or to face
• Wall gables often 12 in (305 mm) deep and 30 or 42 in high depending on the run
• Grain lock on exposed ends; nest carefully to protect yield

Backs square the box and provide a fastening surface to the wall. Full backs are common in frameless and higher-grade work. Partial backs or nailer-only systems appear in some face-frame shops to save sheet goods, at the cost of racking resistance if not detailed carefully.

Back material is often thinner (1/4 in or 1/2 in / 6 to 12 mm) than the 3/4 in (19 mm) carcase. Keep backs on their own material group in the cut list so they never nest onto 3/4 in stock by mistake.

Nailers (also called hanging rails or cleats) are horizontal strips at the top, and sometimes bottom, of the box. They catch screws into wall studs and stiffen the opening. On wall cabinets they are structural; on bases they may support the countertop or tie the stretchers.

Cut list treatment: short, wide rectangles from the same thickness as the carcase, or solid strips optimized linearly. Label them clearly so they are not confused with stretchers.

The toe kick is the recessed plinth at the front of base cabinets that lets someone stand close to the counter. Typical NA recess is about 3 in (76 mm) high and 3 in deep, though shops vary. The kick can be integral to the box, a separate platform, or a continuous run of kick faces across multiple cabinets.

Cut list impact: either notches/recesses in gables and a kick face strip, or a separate ladder/platform with its own sheet and linear parts. See the dedicated toe kick article for construction options.

Fillers close gaps between cabinets and walls, appliances, or inside corners. They absorb out-of-square rooms so the boxes stay modular. On the cut list they are usually linear parts: width set by field measure, length matching cabinet height.

Never cut fillers to final width until the install measure is confirmed. Nest or rip oversized blanks if the shop prefabricates, then scribe on site.

Face-frame stiles and rails are linear hardwood (or sheet strips) that attach to the front of the box. Doors and drawer fronts may be slab sheet goods or five-piece frames; either way they need their own material group and often grain-matched nesting.

Drawer boxes add another sheet family (sides, fronts, backs, bottoms) when the shop builds them in-house. Many shops buy drawer boxes and keep only fronts on the cut list.

Continue with the cabinet making pillar or nest a sample box BOM in the free sheet optimizer.