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

Finger splice joint (finger joint for lengthening): every size, notes, mating features and sources. What is a finger splice joint?

Other sizes

Member A with four tapered fingers
Member B with the matching fingers