Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-spool/  (CC BY 4.0)
Basis: ISO 2852 faces on ASME BPE 16 ga tube; catalog lengths
Catalog version: 2026-10-20

Sizes: see table below
- Face-to-face length is the spool's stated length. Internal volume sets a thermoacoustic engine's resonance; volumes assume 16 ga tube.
- 2 in bore: 50.8 − 2×1.65 = 47.5 mm → 17.7 cm³ per cm. 1.5 in: 34.8 mm → 9.5 cm³ per cm.
- Stack-up per joint: two faces + one compressed gasket web ≈ 2.1 mm (ISO 2852 V). A clamp adds about 10 mm of radial envelope beyond the flange.
- The files carry the full ISO 2852 face, so a printed spool mates with a printed cap and a real clamp for mock-ups.

size_in  length_in  length_mm  bore_mm  volume_cm3
1.5  3  76.2  34.8  72
1.5  6  152.4  34.8  145
1.5  12  304.8  34.8  290
2  3  76.2  47.5  135
2  6  152.4  47.5  270
2  12  304.8  47.5  540
2  18  457.2  47.5  810

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- ISO (via iTeh sample): ISO 2852:1974 clamp liners with gaskets (face and gasket profile, §6.1 and §8) — PDF — standard excerpt; dimensions are facts — https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf
- McMaster-Carr: Sanitary tube spools (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/sanitary-fittings/
- Glacier Tanks: Tri-clamp spools (dimensions on product pages) — web, PDF — vendor catalog [verify license at link] — https://www.glaciertanks.com/tri-clamp-spools

Free files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/tri-clamp-spool/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-spool