Bored 2 in power spool: 2 in × 5 in spool bored to Ø48.00 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/htd-bored-power-spool/  (CC BY 4.0)
Basis: Fabrication spec: a 2 in spool (tube Ø50.8 × 1.65) 127 face to face, its bore finished to Ø48.00 end to end (a machinist bores and hones it); exact geometry
Catalog version: 2026-10-20

Sizes: see table below
- The stock bore is Ø47.5; finished to Ø48.00 it leaves 1.40 of wall. The piston is drawn at Ø48.00 exactly: the running fit is the machinist's (see Mating features).
- Both faces stay standard ISO 2852 2 in faces: Type B gaskets and stock 2 in clamps at each end.

part  length_mm  bore_mm  wall_mm
spool-2in-5in-bored-48.00  127.0  48.0  1.4

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/htd-bored-power-spool/index.json
API: https://xemstudio.com/api/geometry?object=htd-bored-power-spool