Through member reduced to its middle third at the joint

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	middle third
value	6.67 mm

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From the full sheet

Tee bridle joint: every size, notes, mating features and sources. What are the proportions of a tee bridle joint?

Other sizes

End member with the open slot
All parts in their assembled position (each part its own solid)