# Sanitary clamp spools: 3, 6 and 12 in, ½ to 4 in

> How long are tri-clamp spools and what is their bore?

- Category: Hardware › Sanitary clamp fittings
- Kind: Standard part
- Basis: ASME BPE / 3-A clamp-fitting dimensions published identically by Dixon and Steel & O'Brien; ISO 2852 face profile
- Page: https://xemstudio.com/objects/sanitary-clamp-spools/ · JSON: https://xemstudio.com/api/geometry?object=sanitary-clamp-spools · Plain text: https://xemstudio.com/objects/sanitary-clamp-spools/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- A spool: BPE tube with an ISO 2852 face at each end, 76.2, 152.4 or 304.8 mm (3, 6, 12 in) face to face.
- Bore 9.4 / 15.75 / 22.1 / 34.8 / 47.5 / 60.2 / 72.9 / 97.38 mm for ½ to 4 in (tube OD minus two 1.65 mm walls; 2.11 at 4 in).
- Faces are the ISO 2852 profile (2.85 mm rim, 1.6 mm gasket recess, 20° back cone) on the BPE flange diameters; the groove diameter on ½, ¾ and 4 in is derived (flange − 7.0 / 7.5 mm), the rest is from the standard.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| clamp faces | ISO 2852 / BPE flange | clamp + Type B gasket | clamp | all |

## Sizes

| size_in | tube_od_mm | bore_mm | flange_od_mm | lengths_mm |
|---|---|---|---|---|
| ½ | 12.7 | 9.4 | 25.0 | 76.2 / 152.4 / 304.8 |
| ¾ | 19.05 | 15.75 | 25.0 | 76.2 / 152.4 / 304.8 |
| 1 | 25.4 | 22.1 | 50.5 | 76.2 / 152.4 / 304.8 |
| 1½ | 38.1 | 34.8 | 50.5 | 76.2 / 152.4 / 304.8 |
| 2 | 50.8 | 47.5 | 64.0 | 76.2 / 152.4 / 304.8 |
| 2½ | 63.5 | 60.2 | 77.5 | 76.2 / 152.4 / 304.8 |
| 3 | 76.2 | 72.9 | 91.0 | 76.2 / 152.4 / 304.8 |
| 4 | 101.6 | 97.38 | 119.0 | 76.2 / 152.4 / 304.8 |

## Where the files are

- ASME: [BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall)](https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment) — standard — ASME; dimensions are facts (verify at link)
- ISO (via iTeh sample): [ISO 2852 clamp liners: face profile and flange / groove diameters](https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf) — PDF — standard excerpt; dimensions are facts
- Dixon Sanitary: [Clamp elbows, ferrules: dimension sheet](https://dixonvalve.com/en/media/1397776) — PDF — publisher's catalogue; dimensions cited, nothing copied
- Steel & O'Brien: [Sanitary products catalog 2024 (clamp fittings dimension tables)](https://www.steelobrien.com/wp-content/uploads/2024/03/Sanitary-2024-FINAL.pdf) — PDF — publisher's catalogue; dimensions cited, nothing copied

## Free STEP/STL (24 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/sanitary-clamp-spools/index.json

- spool-0.5in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-3in.stl) — ½ in spool, 3 in face to face
- spool-0.5in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-6in.stl) — ½ in spool, 6 in face to face
- spool-0.5in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-12in.stl) — ½ in spool, 12 in face to face
- spool-0.75in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.75in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.75in-3in.stl) — ¾ in spool, 3 in face to face
- spool-0.75in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.75in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.75in-6in.stl) — ¾ in spool, 6 in face to face
- spool-0.75in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.75in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.75in-12in.stl) — ¾ in spool, 12 in face to face
- spool-1in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1in-3in.stl) — 1 in spool, 3 in face to face
- spool-1in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1in-6in.stl) — 1 in spool, 6 in face to face
- spool-1in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1in-12in.stl) — 1 in spool, 12 in face to face
- spool-1.5in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1.5in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1.5in-3in.stl) — 1½ in spool, 3 in face to face
- spool-1.5in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1.5in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1.5in-6in.stl) — 1½ in spool, 6 in face to face
- spool-1.5in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1.5in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-1.5in-12in.stl) — 1½ in spool, 12 in face to face
- spool-2in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2in-3in.stl) — 2 in spool, 3 in face to face
- spool-2in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2in-6in.stl) — 2 in spool, 6 in face to face
- spool-2in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2in-12in.stl) — 2 in spool, 12 in face to face
- spool-2.5in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2.5in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2.5in-3in.stl) — 2½ in spool, 3 in face to face
- spool-2.5in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2.5in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2.5in-6in.stl) — 2½ in spool, 6 in face to face
- spool-2.5in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2.5in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-2.5in-12in.stl) — 2½ in spool, 12 in face to face
- spool-3in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-3in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-3in-3in.stl) — 3 in spool, 3 in face to face
- spool-3in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-3in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-3in-6in.stl) — 3 in spool, 6 in face to face
- spool-3in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-3in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-3in-12in.stl) — 3 in spool, 12 in face to face
- spool-4in-3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-4in-3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-4in-3in.stl) — 4 in spool, 3 in face to face
- spool-4in-6in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-4in-6in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-4in-6in.stl) — 4 in spool, 6 in face to face
- spool-4in-12in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-4in-12in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-4in-12in.stl) — 4 in spool, 12 in face to face

## How it fits

### Connects to
- [Sanitary clamp tees and short-outlet tees (7MP, 7MPS): ½ to 4 in](https://xemstudio.com/objects/sanitary-clamp-tees/): any fitting with the same flange
- [Sanitary clamp end caps (16AMP): ½ to 4 in](https://xemstudio.com/objects/sanitary-clamp-end-caps/): cap either end

### Alternatives
- [Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch](https://xemstudio.com/objects/tri-clamp-spool/): the original 1½ / 2 in spools

### Also needed
- [Sanitary clamp gaskets, ISO 2852 Type B: ½ to 4 in](https://xemstudio.com/objects/sanitary-clamp-gaskets/): gasket per joint
- [Tri-clamp clamp, two-bolt: every flange size ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/): clamp per joint

## Questions

**What is the bore of a 2 inch tri-clamp spool?**

47.5 mm (50.8 OD, 1.65 wall); 34.8 at 1½ in, 72.9 at 3 in.

**What lengths are the spools?**

3, 6 and 12 in face to face: 76.2, 152.4 and 304.8 mm.

## Fits with

- [Sanitary clamp weld ferrules, short and medium: ½ to 4 in](https://xemstudio.com/objects/sanitary-clamp-ferrules/)
- [Sanitary clamp end caps (16AMP): ½ to 4 in](https://xemstudio.com/objects/sanitary-clamp-end-caps/)
- [Sanitary clamp gaskets, ISO 2852 Type B: ½ to 4 in](https://xemstudio.com/objects/sanitary-clamp-gaskets/)
- [Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch](https://xemstudio.com/objects/tri-clamp-spool/)
- [Tri-clamp clamp, two-bolt: every flange size ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/)