Board A

Board A: three fingers

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, Xem Studio Design License — Xem Studio

Dimensions

dimension	fingers
value	10 mm wide, 10 mm long (one board thickness), 6 in all

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From the full sheet

Box joint (finger joint): every size, notes, mating features and sources. How wide are the fingers in a box joint?

Other sizes

Board B
All parts in their assembled position (each part its own solid)