# Sanitary clamp reducers, concentric and eccentric, ½ to 4 in (tri-clamp style, BPE)

> How long is a 2 × 1½ inch sanitary clamp reducer?

- Category: Hardware › Sanitary clamp fittings
- Kind: Standard part
- Basis: ASME BPE / 3-A clamp-fitting dimensions published identically by two manufacturers; ISO 2852 face profile; drawn by Xem Studio from those numbers
- Page: https://xemstudio.com/objects/sanitary-clamp-reducers/ · JSON: https://xemstudio.com/api/geometry?object=sanitary-clamp-reducers · Plain text: https://xemstudio.com/objects/sanitary-clamp-reducers/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

- Concentric (31-14MP) and eccentric (32-14MP) reducers with clamp faces both ends; 0.5 in of straight tube behind each face, then the cone. Eccentric reducers keep one side flat (drawn on −X): lay it flat side down so a line drains.
- Only the size pairs and lengths that both source catalogues list identically are drawn.
- Faces: ISO 2852 profile (2.85 mm rim, 1.6 mm gasket recess, 20° back cone) on the BPE flange diameters ½–¾ in 25.0, 1–1½ in 50.5, 2 in 64.0, 2½ in 77.5, 3 in 91.0, 4 in 119.0 mm; tube OD 12.7 / 19.05 / 25.4 / 38.1 / 50.8 / 63.5 / 76.2 / 101.6 mm, wall 1.65 mm (4 in: 2.11). The gasket-groove diameter on ½, ¾ and 4 in is derived (flange − 7.0 / 7.5 mm, the land width of every size ISO 2852 lists); 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, large and small size | clamp | all |

## Sizes

| size_in | face_to_face_mm | large_tube_od_mm | small_tube_od_mm |
|---|---|---|---|
| ¾ × ½ | 50.8 | 19.05 | 12.7 |
| 1 × ¾ | 50.8 | 25.4 | 19.05 |
| 1½ × 1 | 76.2 | 38.1 | 25.4 |
| 2 × 1 | 127.0 | 50.8 | 25.4 |
| 2 × 1½ | 76.2 | 50.8 | 38.1 |
| 2½ × 1½ | 127.0 | 63.5 | 38.1 |
| 2½ × 2 | 76.2 | 63.5 | 50.8 |
| 3 × 1½ | 177.8 | 76.2 | 38.1 |
| 3 × 2 | 127.0 | 76.2 | 50.8 |
| 3 × 2½ | 76.2 | 76.2 | 63.5 |
| 4 × 2 | 231.8 | 101.6 | 50.8 |
| 4 × 2½ | 181.0 | 101.6 | 63.5 |
| 4 × 3 | 130.2 | 101.6 | 76.2 |

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

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

- reducer-concentric-0.75inx0.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-0.75inx0.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-0.75inx0.5in.stl) — ¾ × ½ in concentric reducer (31-14MP), 2.0 in face to face
- reducer-eccentric-0.75inx0.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-0.75inx0.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-0.75inx0.5in.stl) — ¾ × ½ in eccentric reducer (32-14MP), 2.0 in face to face, flat side on −X
- reducer-concentric-1inx0.75in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-1inx0.75in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-1inx0.75in.stl) — 1 × ¾ in concentric reducer (31-14MP), 2.0 in face to face
- reducer-eccentric-1inx0.75in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-1inx0.75in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-1inx0.75in.stl) — 1 × ¾ in eccentric reducer (32-14MP), 2.0 in face to face, flat side on −X
- reducer-concentric-1.5inx1in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-1.5inx1in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-1.5inx1in.stl) — 1½ × 1 in concentric reducer (31-14MP), 3.0 in face to face
- reducer-eccentric-1.5inx1in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-1.5inx1in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-1.5inx1in.stl) — 1½ × 1 in eccentric reducer (32-14MP), 3.0 in face to face, flat side on −X
- reducer-concentric-2inx1in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2inx1in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2inx1in.stl) — 2 × 1 in concentric reducer (31-14MP), 5.0 in face to face
- reducer-eccentric-2inx1in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2inx1in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2inx1in.stl) — 2 × 1 in eccentric reducer (32-14MP), 5.0 in face to face, flat side on −X
- reducer-concentric-2inx1.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2inx1.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2inx1.5in.stl) — 2 × 1½ in concentric reducer (31-14MP), 3.0 in face to face
- reducer-eccentric-2inx1.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2inx1.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2inx1.5in.stl) — 2 × 1½ in eccentric reducer (32-14MP), 3.0 in face to face, flat side on −X
- reducer-concentric-2.5inx1.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2.5inx1.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2.5inx1.5in.stl) — 2½ × 1½ in concentric reducer (31-14MP), 5.0 in face to face
- reducer-eccentric-2.5inx1.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2.5inx1.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2.5inx1.5in.stl) — 2½ × 1½ in eccentric reducer (32-14MP), 5.0 in face to face, flat side on −X
- reducer-concentric-2.5inx2in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2.5inx2in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-2.5inx2in.stl) — 2½ × 2 in concentric reducer (31-14MP), 3.0 in face to face
- reducer-eccentric-2.5inx2in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2.5inx2in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-2.5inx2in.stl) — 2½ × 2 in eccentric reducer (32-14MP), 3.0 in face to face, flat side on −X
- reducer-concentric-3inx1.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-3inx1.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-3inx1.5in.stl) — 3 × 1½ in concentric reducer (31-14MP), 7.0 in face to face
- reducer-eccentric-3inx1.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-3inx1.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-3inx1.5in.stl) — 3 × 1½ in eccentric reducer (32-14MP), 7.0 in face to face, flat side on −X
- reducer-concentric-3inx2in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-3inx2in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-3inx2in.stl) — 3 × 2 in concentric reducer (31-14MP), 5.0 in face to face
- reducer-eccentric-3inx2in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-3inx2in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-3inx2in.stl) — 3 × 2 in eccentric reducer (32-14MP), 5.0 in face to face, flat side on −X
- reducer-concentric-3inx2.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-3inx2.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-3inx2.5in.stl) — 3 × 2½ in concentric reducer (31-14MP), 3.0 in face to face
- reducer-eccentric-3inx2.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-3inx2.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-3inx2.5in.stl) — 3 × 2½ in eccentric reducer (32-14MP), 3.0 in face to face, flat side on −X
- reducer-concentric-4inx2in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-4inx2in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-4inx2in.stl) — 4 × 2 in concentric reducer (31-14MP), 9.125 in face to face
- reducer-eccentric-4inx2in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-4inx2in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-4inx2in.stl) — 4 × 2 in eccentric reducer (32-14MP), 9.125 in face to face, flat side on −X
- reducer-concentric-4inx2.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-4inx2.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-4inx2.5in.stl) — 4 × 2½ in concentric reducer (31-14MP), 7.125 in face to face
- reducer-eccentric-4inx2.5in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-4inx2.5in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-4inx2.5in.stl) — 4 × 2½ in eccentric reducer (32-14MP), 7.125 in face to face, flat side on −X
- reducer-concentric-4inx3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-4inx3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-concentric-4inx3in.stl) — 4 × 3 in concentric reducer (31-14MP), 5.125 in face to face
- reducer-eccentric-4inx3in: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-4inx3in.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-reducers/reducer-eccentric-4inx3in.stl) — 4 × 3 in eccentric reducer (32-14MP), 5.125 in face to face, flat side on −X

## How it fits

### Connects to
- [Tri-clamp clamps (printable two-bolt), hot-joint gaskets and heat shields: every flange size, ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/): clamps for both sizes
- [Sanitary clamp caps, ferrules, spools and gaskets, ½ to 4 in (tri-clamp style, BPE)](https://xemstudio.com/objects/sanitary-clamp-caps-ferrules-spools/): gaskets and spools for both sizes

### Alternatives
- [Sanitary clamp tees, short-outlet tees and crosses, ½ to 4 in (tri-clamp style, BPE)](https://xemstudio.com/objects/sanitary-clamp-tees-crosses/): reduce at a branch instead

## Questions

**How long is a 2 × 1½ in sanitary clamp reducer?**

3.0 in (76.2 mm) face to face, concentric or eccentric.

**Concentric or eccentric?**

Concentric keeps the centreline; eccentric keeps one side flat so a horizontal line drains or vents without a pocket.

## Fits with

- [Sanitary clamp elbows, 90° and 45°, ½ to 4 in (tri-clamp style, BPE)](https://xemstudio.com/objects/sanitary-clamp-elbows/)
- [Sanitary clamp tees, short-outlet tees and crosses, ½ to 4 in (tri-clamp style, BPE)](https://xemstudio.com/objects/sanitary-clamp-tees-crosses/)
- [Sanitary clamp caps, ferrules, spools and gaskets, ½ to 4 in (tri-clamp style, BPE)](https://xemstudio.com/objects/sanitary-clamp-caps-ferrules-spools/)
- [Tri-clamp clamps (printable two-bolt), hot-joint gaskets and heat shields: every flange size, ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/)