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2 in × 25.4 mm thermal-break spacer

2 in × 25.4 mm thermal-break spacer: ISO 2852 faces both ends (the standard ferrule profile), Ø47.5 bore, Ø50.8 between the faces; two clamps, one on each face, so no clamp bridges it

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

part	break-spacer-2in-25.4
face_to_face_mm	25.4
bore_mm	47.5
outside between faces_mm	50.8
joints	2
clamps	2

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From the full sheet

Tri-clamp thermal-break spacer, 2 in × 25.4 mm: an insulating section with its own two clamp faces: every size, notes, mating features and sources. How do I put a thermal break between two tri-clamp sections?