Tri-Clamp information guide
Sizing, gasket selection, clamp styles, and pressure ratings for sanitary fittings
Find your clamp size
Ferrule flange OD
—
Clamp size
—
Standard gasket
—
Select your tube OD above
Quick reference: tube OD → clamp size
| Tube OD | Ferrule flange OD | Clamp size |
|---|---|---|
| 1/2" | 0.984" | 3/4" clamp compatible pair |
| 3/4" | 0.984" | 3/4" clamp compatible pair |
| 1" | 1.984" | 1.5" clamp compatible pair |
| 1.5" | 1.984" | 1.5" clamp compatible pair |
| 2" | 2.516" | 2" clamp |
| 2.5" | 3.047" | 2.5" clamp |
| 3" | 3.579" | 3" clamp |
| 4" | 4.682" | 4" clamp |
How sizing works
Clamp size is based on tube OD, not the ferrule flange. The flange is approximately ½" larger than the tube — measuring the flange and ordering that size results in a clamp that is too large.
½" and ¾" tubes share the same 3/4" clamp. 1" and 1.5" tubes share the same 1.5" clamp. These compatible pairs can be joined directly.
Joining different-sized tubes within a compatible pair creates an abrupt step change in flow path. Use a concentric or eccentric reducer for a gradual transition.
Gasket selection
| Connection | Correct gasket | Rule |
|---|---|---|
| ½" + ½" | ½" gasket | Same size |
| ¾" + ¾" | ¾" gasket | Same size |
| ½" + ¾" | ¾" gasket | Always use the larger size |
| 1" + 1" | 1" gasket | Same size |
| 1.5" + 1.5" | 1.5" gasket | Same size |
| 1" + 1.5" | 1.5" gasket | Always use the larger size |
| 2" and larger | Matching size | Each size has its own clamp |
Clamp style selection
Single hinge
13MHM
Cost-effective for most applications. Quick to install and remove for frequent service intervals.
Double hinge
13MHHM-DP
More flexible design for tight spaces. Similar pressure ratings to single hinge, easier to maneuver.
High pressure / bolted
13MHP
Two-piece bolted design with brass nut. Best for high-pressure or semi-permanent installations.
Maximum pressure ratings (PSI)
| Size | Single hinge (13MHM) | Double hinge (13MHHM-DP) | High pressure (13MHP) | Max torque | |||
|---|---|---|---|---|---|---|---|
| 70°F | 250°F | 70°F | 250°F | 70°F | 250°F | ||
| 3/4" | 1500 | 1200 | 1500 | 1200 | 1500 | 1200 | 130 in-lbf |
| 1.5" | 500 | 250 | 500 | 250 | 1500 | 1200 | 130 in-lbf |
| 2" | 450 | 250 | 450 | 250 | 1000 | 800 | 130 in-lbf |
| 2.5" | 400 | 200 | 400 | 200 | 1000 | 800 | 130 in-lbf |
| 3" | 350 | 150 | 350 | 150 | 1000 | 800 | 130 in-lbf |
| 4" | 200 | 125 | 200 | 125 | 800 | 600 | 200 in-lbf |
| 6" | 150 | 75 | 300 | 200 | — | — | 200 in-lbf |
| 8" | 100 | 50 | 250 | 150 | — | — | 200 in-lbf |
| 10" | 40 | 30 | 200 | 125 | — | — | 200 in-lbf |
| 12" | 30 | 25 | 150 | 100 | — | — | 200 in-lbf |