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hot-end fin sleeve for the 2 in tube

hot-end fin sleeve for the 2 in tube: bore Ø50.8 (the tube OD) × 49.0, 3 mm wall, 9 ring fins Ø80 × 1.5 at 5 pitch, 7 mm band over the top fin with 3 × M4 tapped (Ø3.3) at 0 / 120 / 240°

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

feature	bore
value	Ø50.8 (tube OD)

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From the full sheet

Hot-end fin sleeve for a 2 in tri-clamp cup: slide-on ring fins, set-screw held: every size, notes, mating features and sources. How do I put fins on a tri-clamp fitting without a custom finned fitting?