Block with a 4 mm wide slot from the side, 1.6 mm tall, and a Ø2 screw hole

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	screw hole
value	Ø2 mm

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From the full sheet

M2 captive nut slot (side-loaded): every size, notes, mating features and sources. How do you make a side-loaded M2 nut slot?

Other sizes

M2 hex nut, in place
All parts in their assembled position (each part its own solid)