Tri-Clamp Fittings Burst Pressure and Temperature Ratings - Inox Fittings

Tri-Clamp Fittings Burst Pressure and Temperature Ratings

March 3, 2026
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Tri-clamp fittings are weakest at the connection where two flange ferrules join. This joint relies on a gasket and clamp, making it the most vulnerable point for both pressure and temperature.

Under pressure, the clamp is the likely failure point; under high temperatures, the gasket is more likely to fail.

The tables below outline the temperature and pressure ratings for clamps and gaskets. For clamps, we have selected our strongest clamp, the double-bolt high-pressure tri-clamp.

Also displayed are the recommended pressure ratings in kPa (kilopascals) at varying temperatures.

 

Gasket Temperature Ratings

Gasket Temperature Range
Buna (Nitrile) Standard: -37°C to 121°C
EPDM (Ethylene Propylene) Standard: -54°C to 149°C
PTFE (Teflon®) Standard: -157°C to 232°C
FKM (Viton®) Standard: -26°C to 222°C

 

Double Bolt High-Pressure Tri-Clamp Ratings

Part Number Size (Tube O/D) (inches) Service Pressure Rating
at 21.1°C (kPa)		 Service Pressure Rating
at 121.1°C (kPa)
HTC1219 1/2 – 3/4 10,300 8,270
HTC2538 1 – 1 1/2 10,300 8,270
HTC50 2 6,890 5,500
HTC65 2 1/2 6,890 5,500
HTC76 3 6,890 5,500
HTC100 4 5,500 4,130
HTC125 5 5,100 3,800
HTC150 6 2,070 1,400
HTC200 8 1,000 600

 

Theorectical Tube Burst Pressure Ratings

Size (Tube O/D) (inches) Dimensions Burst Pressure (kPa)
Wall (mm) Gauge
3/4 0.065 16 79,750
1 0.065 16 67,224
1 1/2 0.065 16 44,837
2 0.065 16 33,612
2 1/2 0.065 16 22,890
3 0.065 16 22,394
4 0.083 14 18,832
6 0.083 14 15,548
6 0.109 12 17,533
8 0.083 14 9,411
8 0.109 12 13,148

 

The information presented above are average values and not a guarantee of maximum values.

Download the Fact Sheet here. 

 


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