Library › Hardware › Clearance-seal hollow piston: Ø40.00 land, Ø38.50 body, 106 long

displacer cold cap

displacer cold cap: running land Ø40.00 × 8, spigot Ø36.50 × 6 into the shell (press), M6 tapped (Ø5.0) × 12, Ø0.5 vent

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	shell
od_mm	38.5
length_mm	98.0
fit	designed 0.75 gap

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

From the full sheet

Clearance-seal hollow piston: Ø40.00 land, Ø38.50 body, 106 long: every size, notes, mating features and sources. What hollow piston runs in a 40 mm liner with a clearance seal?

Other sizes

displacer shell Ø38.50 × 98 (z 8–106), wall 1, closed hot end 1.5 with a 1.0 round