# Tri-clamp dial thermometers (envelope): 3 and 5 in dial, ¼ in stem 2½ to 12 in, 1½ in clamp

> How long a stem does a tri-clamp thermometer need?

- Category: Hardware › Sanitary clamp fittings
- Kind: Hardware
- Basis: Envelope drawn by Xem Studio: the standard 1–1½ in solid cap, a ¼ in (6.35) stem, a 12 × 20 neck and a back-connected case at the nominal dial size + 6 mm; check a real thermometer's case before designing tight around it
- Page: https://xemstudio.com/objects/tri-clamp-dial-thermometers/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-dial-thermometers · Plain text: https://xemstudio.com/objects/tri-clamp-dial-thermometers/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Sanitary dial thermometers with a clamp face: a space model for planning a lid or a stand around one, or a dummy to print. Stem length is from the clamp face to the tip.
- Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.

## Sizes

| dial_in | stem_in | stem_mm | stem_od_mm | case_od_mm |
|---|---|---|---|---|
| 3 | 2.5 | 63.5 | 6.35 | 82.2 |
| 3 | 4 | 101.6 | 6.35 | 82.2 |
| 3 | 6 | 152.4 | 6.35 | 82.2 |
| 3 | 9 | 228.6 | 6.35 | 82.2 |
| 3 | 12 | 304.8 | 6.35 | 82.2 |
| 5 | 2.5 | 63.5 | 6.35 | 133.0 |
| 5 | 4 | 101.6 | 6.35 | 133.0 |
| 5 | 6 | 152.4 | 6.35 | 133.0 |
| 5 | 9 | 228.6 | 6.35 | 133.0 |
| 5 | 12 | 304.8 | 6.35 | 133.0 |

## Where the files are

- GW Kent: [Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness](https://www.gwkent.com/triclamp-guide) — web — publisher's guide; dimensions cited
- Rubber Fab: [Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)](https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf) — PDF — maker chart; dimensions are facts (verify at link)

## Free STEP/STL (10 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/index.json

- dial-thermometer-3in-1.5in-clamp-2.5in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-2.5in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-2.5in.stl) — 3 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 2.5 in below the face, case Ø82.2, top 56.4 above the face
- dial-thermometer-3in-1.5in-clamp-4in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-4in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-4in.stl) — 3 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 4 in below the face, case Ø82.2, top 56.4 above the face
- dial-thermometer-3in-1.5in-clamp-6in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-6in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-6in.stl) — 3 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 6 in below the face, case Ø82.2, top 56.4 above the face
- dial-thermometer-3in-1.5in-clamp-9in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-9in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-9in.stl) — 3 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 9 in below the face, case Ø82.2, top 56.4 above the face
- dial-thermometer-3in-1.5in-clamp-12in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-12in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-3in-1.5in-clamp-12in.stl) — 3 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 12 in below the face, case Ø82.2, top 56.4 above the face
- dial-thermometer-5in-1.5in-clamp-2.5in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-2.5in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-2.5in.stl) — 5 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 2.5 in below the face, case Ø133.0, top 62.4 above the face
- dial-thermometer-5in-1.5in-clamp-4in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-4in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-4in.stl) — 5 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 4 in below the face, case Ø133.0, top 62.4 above the face
- dial-thermometer-5in-1.5in-clamp-6in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-6in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-6in.stl) — 5 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 6 in below the face, case Ø133.0, top 62.4 above the face
- dial-thermometer-5in-1.5in-clamp-9in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-9in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-9in.stl) — 5 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 9 in below the face, case Ø133.0, top 62.4 above the face
- dial-thermometer-5in-1.5in-clamp-12in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-12in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-dial-thermometers/dial-thermometer-5in-1.5in-clamp-12in.stl) — 5 in dial thermometer envelope on a 1–1½ in clamp: ¼ in stem 12 in below the face, case Ø133.0, top 62.4 above the face

## Questions

**Thermometer or thermowell?**

A thermometer with a clamp face touches the liquid; a thermowell keeps any ¼ in stem dry and lets you swap probes without opening the vessel.

## Fits with

- [Tri-clamp thermowells: 1½ and 2 in clamp, 2½ to 12 in insertion, ½ NPT top](https://xemstudio.com/objects/tri-clamp-thermowells/)
- [Tri-clamp end caps with ports: NPT, clamp nozzle, hose barb and airlock hole, 1½ to 8 in](https://xemstudio.com/objects/tri-clamp-ported-end-caps/)