# Printable tri-clamp (45°): two-bolt clamps, ½ to 8 in

> What clamp fits a 45° printable tri-clamp?

- Category: Hardware › Printable tri-clamp
- Kind: Hardware
- Basis: Xem Studio design: the two-bolt clamp on this site with its groove walls at 45° to match the 45° rims; contact after 0.4 mm of travel per half, 0.6 mm squeeze
- Page: https://xemstudio.com/objects/printable-tri-clamp-clamps/ · JSON: https://xemstudio.com/api/geometry?object=printable-tri-clamp-clamps · Plain text: https://xemstudio.com/objects/printable-tri-clamp-clamps/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

- One clamp per flange size: ½–¾ in (25.0), 1–1½ in (50.5), 2, 2½, 3, 4, 6 and 8 in.
- Printable tri-clamp: the ISO 2852 face and gasket groove are exactly standard, only the back cone behind each rim is 45° instead of 20°, so no rim overhangs more than 45° from vertical in any print orientation. Join these with the 45° clamps (printable-tri-clamp-clamps) and standard Type B gaskets; a 45° clamp fits only 45° rims, so keep a run all 45°. A 45° cone turns clamp force into face force at 1 : 1 (a 20° cone at 2.7 : 1), so tighten the clamp bolts harder or use M6.
- Print orientation: straight parts face down; elbows, tees and crosses with one face down; horizontal bores bridge their top, so keep them small or add a light tree support inside.
- 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 | flange_mm | clamp_od_mm | width_mm | bolts |
|---|---|---|---|---|
| ½–¾ | 25.0 | 34.0 | 16.4 | 2 × M5 (12.9) or drill Ø6.6 for M6 |
| 1–1½ | 50.5 | 59.5 | 22.8 | 2 × M5 (12.9) or drill Ø6.6 for M6 |
| 2 | 64.0 | 73.0 | 23.6 | 2 × M5 (12.9) or drill Ø6.6 for M6 |
| 2½ | 77.5 | 86.5 | 24.4 | 2 × M5 (12.9) or drill Ø6.6 for M6 |
| 3 | 91.0 | 100.0 | 25.2 | 2 × M5 (12.9) or drill Ø6.6 for M6 |
| 4 | 119.0 | 128.0 | 27.8 | 2 × M5 (12.9) or drill Ø6.6 for M6 |
| 6 | 166.9 | 180.9 | 27.9 | 2 × M8 |
| 8 | 217.7 | 231.7 | 27.9 | 2 × M8 |

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

Index: https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/index.json

- clamp-half-45-0.75in: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-0.75in.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-0.75in.stl) — ½–¾ in two-bolt clamp half for 45° rims (two per joint), M5
- clamp-half-45-1.5in: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-1.5in.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-1.5in.stl) — 1–1½ in two-bolt clamp half for 45° rims (two per joint), M5
- clamp-half-45-2in: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-2in.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-2in.stl) — 2 in two-bolt clamp half for 45° rims (two per joint), M5
- clamp-half-45-2.5in: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-2.5in.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-2.5in.stl) — 2½ in two-bolt clamp half for 45° rims (two per joint), M5
- clamp-half-45-3in: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-3in.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-3in.stl) — 3 in two-bolt clamp half for 45° rims (two per joint), M5
- clamp-half-45-4in: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-4in.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-4in.stl) — 4 in two-bolt clamp half for 45° rims (two per joint), M5
- clamp-half-45-6in-m8: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-6in-m8.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-6in-m8.stl) — 6 in two-bolt clamp half for 45° rims (two per joint), M8
- clamp-half-45-8in-m8: [STEP](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-8in-m8.step) · [STL](https://xemstudio.com/files/hardware/printable-tri-clamp-clamps/clamp-half-45-8in-m8.stl) — 8 in two-bolt clamp half for 45° rims (two per joint), M8

## Questions

**Why more bolt force?**

A 45° wedge multiplies clamp force 1 : 1 into the faces, a 20° wedge 2.7 : 1.

## Fits with

- [Printable tri-clamp (45°): ferrules, spools and caps, ½ to 4 in](https://xemstudio.com/objects/tri-clamp-45-degree-printable/)
- [Printable tri-clamp (45°): 90° and 45° elbows, ½ to 4 in](https://xemstudio.com/objects/printable-tri-clamp-elbows/)
- [Printable tri-clamp (45°): tees, short-outlet tees and crosses, ½ to 4 in](https://xemstudio.com/objects/printable-tri-clamp-tees-crosses/)
- [Printable tri-clamp (45°): concentric and eccentric reducers, ½ to 4 in](https://xemstudio.com/objects/printable-tri-clamp-reducers/)
- [Printable tri-clamp (45°): NPT male, NPT female and hose-barb adapters](https://xemstudio.com/objects/printable-tri-clamp-adapters/)
- [Printable tri-clamp (45°): dome lids and ported caps](https://xemstudio.com/objects/printable-tri-clamp-lids-caps/)