Tenon split at its end, shown spread (assembled state)

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	wedge
value	4 mm head, 12 mm long

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From the full sheet

Jigoku hozo (hidden wedged tenon): every size, notes, mating features and sources. How does a jigoku hozo joint work?

Other sizes

Blind mortise flared 2 mm per side toward its bottom
Wedge sitting at the bottom of the mortise
All parts in their assembled position (each part its own solid)