# Tri-clamp probe gland caps: Ø4, Ø6 and ¼ in probes, 1 to 3 per cap

> How do I put a 6 mm temperature probe through a tri-clamp lid?

- Category: Hardware › Sanitary clamp fittings
- Kind: Hardware
- Basis: Xem Studio design on the standard solid cap: a boss bored to the probe diameter with two internal grooves for a probe-size × 1.5 O-ring
- Page: https://xemstudio.com/objects/tri-clamp-probe-gland-caps/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-probe-gland-caps · Plain text: https://xemstudio.com/objects/tri-clamp-probe-gland-caps/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

- Slide a stainless probe (the common 6 × 50 mm DS18B20 temperature probe, a Ø4 thermocouple or a ¼ in RTD) down through the lid; two O-rings seal it and let you set the depth.
- 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

| clamp | probe_mm | ports | o_ring |
|---|---|---|---|
| 1–1½ | 4.0 | 1 | 4 × 1.5 |
| 1–1½ | 4.0 | 2 | 4 × 1.5 |
| 1–1½ | 4.0 | 3 | 4 × 1.5 |
| 1–1½ | 6.0 | 1 | 6 × 1.5 |
| 1–1½ | 6.0 | 2 | 6 × 1.5 |
| 1–1½ | 6.0 | 3 | 6 × 1.5 |
| 1–1½ | 6.35 | 1 | 6.35 × 1.5 |
| 1–1½ | 6.35 | 2 | 6.35 × 1.5 |
| 1–1½ | 6.35 | 3 | 6.35 × 1.5 |
| 2 | 4.0 | 1 | 4 × 1.5 |
| 2 | 4.0 | 2 | 4 × 1.5 |
| 2 | 4.0 | 3 | 4 × 1.5 |
| 2 | 6.0 | 1 | 6 × 1.5 |
| 2 | 6.0 | 2 | 6 × 1.5 |
| 2 | 6.0 | 3 | 6 × 1.5 |
| 2 | 6.35 | 1 | 6.35 × 1.5 |
| 2 | 6.35 | 2 | 6.35 × 1.5 |
| 2 | 6.35 | 3 | 6.35 × 1.5 |

## 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 (18 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/index.json

- gland-cap-1.5in-4mm-x1: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-4mm-x1.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-4mm-x1.stl) — 1–1½ in cap with 1 × Ø4 probe gland: Ø14 × 22 boss, two O-ring grooves Ø6.4 × 2
- gland-cap-1.5in-4mm-x2: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-4mm-x2.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-4mm-x2.stl) — 1–1½ in cap with 2 × Ø4 probe gland: Ø14 × 22 boss, two O-ring grooves Ø6.4 × 2
- gland-cap-1.5in-4mm-x3: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-4mm-x3.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-4mm-x3.stl) — 1–1½ in cap with 3 × Ø4 probe gland: Ø14 × 22 boss, two O-ring grooves Ø6.4 × 2
- gland-cap-1.5in-6mm-x1: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6mm-x1.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6mm-x1.stl) — 1–1½ in cap with 1 × Ø6 probe gland: Ø16 × 22 boss, two O-ring grooves Ø8.4 × 2
- gland-cap-1.5in-6mm-x2: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6mm-x2.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6mm-x2.stl) — 1–1½ in cap with 2 × Ø6 probe gland: Ø16 × 22 boss, two O-ring grooves Ø8.4 × 2
- gland-cap-1.5in-6mm-x3: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6mm-x3.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6mm-x3.stl) — 1–1½ in cap with 3 × Ø6 probe gland: Ø16 × 22 boss, two O-ring grooves Ø8.4 × 2
- gland-cap-1.5in-6.35mm-x1: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6.35mm-x1.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6.35mm-x1.stl) — 1–1½ in cap with 1 × Ø6.35 probe gland: Ø16.35 × 22 boss, two O-ring grooves Ø8.75 × 2
- gland-cap-1.5in-6.35mm-x2: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6.35mm-x2.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6.35mm-x2.stl) — 1–1½ in cap with 2 × Ø6.35 probe gland: Ø16.35 × 22 boss, two O-ring grooves Ø8.75 × 2
- gland-cap-1.5in-6.35mm-x3: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6.35mm-x3.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-1.5in-6.35mm-x3.stl) — 1–1½ in cap with 3 × Ø6.35 probe gland: Ø16.35 × 22 boss, two O-ring grooves Ø8.75 × 2
- gland-cap-2in-4mm-x1: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-4mm-x1.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-4mm-x1.stl) — 2 in cap with 1 × Ø4 probe gland: Ø14 × 22 boss, two O-ring grooves Ø6.4 × 2
- gland-cap-2in-4mm-x2: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-4mm-x2.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-4mm-x2.stl) — 2 in cap with 2 × Ø4 probe gland: Ø14 × 22 boss, two O-ring grooves Ø6.4 × 2
- gland-cap-2in-4mm-x3: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-4mm-x3.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-4mm-x3.stl) — 2 in cap with 3 × Ø4 probe gland: Ø14 × 22 boss, two O-ring grooves Ø6.4 × 2
- gland-cap-2in-6mm-x1: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6mm-x1.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6mm-x1.stl) — 2 in cap with 1 × Ø6 probe gland: Ø16 × 22 boss, two O-ring grooves Ø8.4 × 2
- gland-cap-2in-6mm-x2: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6mm-x2.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6mm-x2.stl) — 2 in cap with 2 × Ø6 probe gland: Ø16 × 22 boss, two O-ring grooves Ø8.4 × 2
- gland-cap-2in-6mm-x3: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6mm-x3.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6mm-x3.stl) — 2 in cap with 3 × Ø6 probe gland: Ø16 × 22 boss, two O-ring grooves Ø8.4 × 2
- gland-cap-2in-6.35mm-x1: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6.35mm-x1.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6.35mm-x1.stl) — 2 in cap with 1 × Ø6.35 probe gland: Ø16.35 × 22 boss, two O-ring grooves Ø8.75 × 2
- gland-cap-2in-6.35mm-x2: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6.35mm-x2.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6.35mm-x2.stl) — 2 in cap with 2 × Ø6.35 probe gland: Ø16.35 × 22 boss, two O-ring grooves Ø8.75 × 2
- gland-cap-2in-6.35mm-x3: [STEP](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6.35mm-x3.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-probe-gland-caps/gland-cap-2in-6.35mm-x3.stl) — 2 in cap with 3 × Ø6.35 probe gland: Ø16.35 × 22 boss, two O-ring grooves Ø8.75 × 2

## Questions

**Which O-ring?**

One the size of the probe with a 1.5 mm section (6 × 1.5 for a 6 mm probe), two per port.

## Fits with

- [Tri-clamp caps with PG13.5 probe ports (12 mm pH, dissolved O₂ and CO₂ probes): 1½ to 4 in](https://xemstudio.com/objects/tri-clamp-pg13-5-probe-ports/)
- [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 brewing sensor lids: 4, 6 and 8 in caps with every port a fermenter needs](https://xemstudio.com/objects/tri-clamp-brewing-sensor-lids/)