M3 hex nut, 5.5 AF × 2.4

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	nut
value	ISO 4032 M3: 5.5 mm AF, 2.4 mm thick

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From the full sheet

M3 nut trap (hex pocket for an ISO 4032 nut): every size, notes, mating features and sources. What size is an M3 nut trap?

Other sizes

Block with a 5.5 mm hex pocket, 2.4 mm deep, and a Ø3 screw hole
All parts in their assembled position (each part its own solid)