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

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	parts
value	part a, part b

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From the full sheet

Hooked scarf joint (okkake tsugi): every size, notes, mating features and sources. How does a hooked scarf joint resist pulling apart?

Other sizes

Member A with two hooks
Member B with the matching hooks