Wood Joint Explorer
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Half-lap joint Workbench

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Half-lap joint marked out — the state the viewer opens from: layout lines scribed, no waste removed yet.
Construction
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Parts

Drag to rotate. Right-drag to move. Middle-drag to zoom; wheel zoom needs Rotate on. Double-click to refit.

Tap Rotate, then drag to rotate. Two fingers move or zoom. Double-tap to refit. Turn Rotate off to scroll from the stage.

Parameter controls need the 3D renderer; this device shows the drawn defaults.

Geometry
20 mm13/16 in
45 mm1 3/4 in
50% of the thickness left on the lower piece
both cheeks cut to the gauge line
Wood tone

Readouts

Glue area
2025 mm²3.14 in²
Parts
2
Cuts
2
Units

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Cut list, finished sizes at the current settings
PartWidthThicknessCutsDeepest cut
Piece A45 mm1 3/4 in20 mm13/16 in110 mm3/8 in
Piece B45 mm1 3/4 in20 mm13/16 in110 mm3/8 in

Board length along the grain is a display convention in the model and is not listed.

About this joint

A half-lap joins two pieces by cutting a notch half the thickness deep in each, so the two halves overlap and finish level with one another. The wide face-to-face contact is long grain on long grain, and the sawn shoulders bear on the edges of the mating piece, which is what holds a frame square.

Read the Half-lap joint guide