Library › Hardware › Hollow pistons Ø29 × 75 and Ø39 × 100

displacer Ø39 (0.5 mm radial gap in a Ø40 bore) × 100, hollow 1.2 wall, Ø5 rod boss

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

file	displacer-40x100
diameter	39
length	100
bore it runs in	40
radial gap	0.5
wall	1.2
rod bore	5

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From the full sheet

Hollow pistons Ø29 × 75 and Ø39 × 100: every size, notes, mating features and sources. What hollow piston fits a 30 or 40 mm liner?

Other sizes

displacer Ø29 (0.5 mm radial gap in a Ø30 bore) × 75, hollow 1.2 wall, Ø5 rod boss