# Two-bolt clamps for 6 and 8 in tri-clamp joints

> What clamp fits a 6 inch tri-clamp?

- Category: Hardware › Sanitary clamp fittings
- Kind: Hardware
- Basis: Groove is the ISO 2852 rim's 20° back cone mirrored (as the 10 and 12 in clamps on this site): contact after 0.4 mm of travel per half, 0.6 mm more squeezes the gasket before the halves meet
- Page: https://xemstudio.com/objects/sanitary-clamp-clamps-6-8in/ · JSON: https://xemstudio.com/api/geometry?object=sanitary-clamp-clamps-6-8in · Plain text: https://xemstudio.com/objects/sanitary-clamp-clamps-6-8in/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

- Two identical halves per joint, turned 180° to each other; tighten the two M8 bolts evenly until the halves just meet.
- 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

| size_in | clamp_od_mm | width_mm | bolts |
|---|---|---|---|
| 6 | 180.9 | 19.43 | 2 × M8 × 40 + nuts |
| 8 | 231.7 | 19.43 | 2 × M8 × 40 + nuts |

## 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 dimensions chart (ID, OD, bead per clamp size, ½ to 12 in and DIN 32676)](https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf) — PDF — publisher's chart; dimensions cited, nothing copied
- 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 (2 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/sanitary-clamp-clamps-6-8in/index.json

- clamp-half-6in-m8: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-clamps-6-8in/clamp-half-6in-m8.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-clamps-6-8in/clamp-half-6in-m8.stl) — 6 in two-bolt clamp half (two per joint): 20° groove, contact after 0.4, 0.6 squeeze; Ø180.9 × 19.43 wide; M8 × 40 hex bolts (ISO 4017), head in a 13 AF pocket on one lug
- clamp-half-8in-m8: [STEP](https://xemstudio.com/files/hardware/sanitary-clamp-clamps-6-8in/clamp-half-8in-m8.step) · [STL](https://xemstudio.com/files/hardware/sanitary-clamp-clamps-6-8in/clamp-half-8in-m8.stl) — 8 in two-bolt clamp half (two per joint): 20° groove, contact after 0.4, 0.6 squeeze; Ø231.7 × 19.43 wide; M8 × 40 hex bolts (ISO 4017), head in a 13 AF pocket on one lug

## Questions

**How does the clamp seat?**

The 20° groove wedges the two rims together; when the halves meet, the gasket is squeezed by design.

## Fits with

- [Sanitary clamp weld ferrules, 6 and 8 in (tri-clamp style)](https://xemstudio.com/objects/sanitary-clamp-ferrules-6-8in/)
- [Sanitary clamp gaskets, 6 and 8 in (Type B profile)](https://xemstudio.com/objects/sanitary-clamp-gaskets-6-8in/)