Member B with the matching 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	4 across the width, 20 mm long, tapered

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