Clamp-on hot-end fin sleeve for a 2 in tri-clamp tube (optional) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-hot-end-fin-sleeve/  (CC BY 4.0)
Basis: Design values: ring fins Ø76 × 1.5 at 5 pitch, two halves clamping the Ø50.8 tube
Catalog version: 2026-10-20

Sizes: see table below
- Two halves with 14 ring fins that clamp onto the lower 66 mm of the closed-end spool with 4 × M4 × 16: the flame passes between the fins inside the shroud. The spool itself stays plain.
- Optional: without it the flame heats the bare tube; the analysis on the performance page assumes the inside wall at 800 K either way, and the sleeve is how a burner gets there with less flame.

feature  value
fins  14 × Ø76 × 1.5, pitch 5
bore  Ø50.8 (clamp)
height  2–68.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/tri-clamp-hot-end-fin-sleeve/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-hot-end-fin-sleeve