Rail with a short (stub) tenon that fills the groove

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	groove
value	6.67 mm wide, 8 mm deep

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From the full sheet

Stub tenon joint (frame and panel): every size, notes, mating features and sources. What is a stub tenon?

Other sizes

Stile with a full-length groove
All parts in their assembled position (each part its own solid)