Tri-Clamp Gaskets

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Sanitary tri-clamp gaskets are used to make a secure, leak-proof connection between clamp fittings.

A variety of materials are available for selection depending upon medium used inline processing. Gaskets range in size from 1/2 inch to 12 inches.

If you would like a copy of a gaskets certificate, please ask for them at the time of order. Certificates are specific per lot of gaskets.  Much like a heat number for fittings, gaskets have what is called a lot number. We don’t log these numbers at the time of order but we do include them on the packaging if you need the certificate after receiving them.

Please see Compound Selection Guide for compatibility information. Gasket Cleaning & Maintenance
Size (Tube OD) Material
Buna EPDM Teflon® Viton® Teflon®/EPDM
1/2" 40MP-.50-BUNA 40MP-.50-EPDM 40MP-.50-TEFLON 40MP-.50-VITON KCG00500TE-EPDM
3/4" 40MP-.75-BUNA 40MP-.75-EPDM 40MP-.75-TEFLON 40MP-.75-VITON KCG00750TE-EPDM
1-1/2" 40MP-1.5-BUNA 40MP-1.5-EPDM 40MP-1.5-TEFLON 40MP-1.5-VITON KCG01500TE-EPDM
2-1/2" 40MP-2.5-BUNA 40MP-2.5-EPDM 40MP-2.5-TEFLON 40MP-2.5-VITON KCG02500TE-EPDM
8 " 40MP-8-BUNA 40MP-8-EPDM N/A N/A KCG08000TE-EPDM

Tri-Clamp Gasket Sizes & Dimensions

Tri-Clamp Gasket Dimensions
Sanitary Size A B C D
1/2" .875 .4375 NA
3/4" .875 .6250 NA
1" 1.984" .900" 1.718" 0.203"
1 1/2" 1.984" 1.400" 1.718" 0.203"
2" 2.515" 1.900" 2.218" 0.203"
2 1/2" 3.050" 2.400" 2.781" 0.203"
3" 3.579" 2.900" 3.281" 0.203"
4" 4.682" 3.869" 4.344" 0.203"
6" 6.570" 5.813" 6.176" 0.203"
8" 8.570" 7.813" 8.165" 0.238"
10" 10.570" 9.813" 10.156" 0.238"
12" 12.570" 11.813" 12.151" 0.238"

Tri-Clamp Gasket Comparison Guide

Gasket Temperature Range Recommended Usage Not Recommended Industry Certification Approval
Buna (Nitrile) Standard: -35°F to 250°F (-37°C to 121°C) Water, Oils, Fuels Ketones, Strong Acids, Sunlight, Ozone, Weathering Food & Beverage FDA Approved
EPDM (Ethylene Propylene) Standard: -65°F to 300°F (-54°C to 149°C) Sunlight, Weathering, Hot Water, Steam, Select Acids/Bases, Alcohols Oils, Fuels Bio-Pharmaceutical, Food & Beverage, Drinking Water USP Class VI Tested
PTFE (Teflon®) Standard: -250°F to 450°F (-157°C to 232°C) Chemical, Heat, Pressure Applications Stretching, Elasticity Chemical Processing USP Class VI Tested
FKM (Viton®) Standard: -15°F to 437°F (-26°C to 222°C) Vacuum, Most Acids / Chemicals, Oils, Fuels Ketones, Ammonia, Hot Water / Steam Chemical Processing USP Class VI Tested

Watch How to Measure Tri-Clamp Fittings

Tri-Clamp Fittings and Gasket Sizing Guide

Sanitary Fitting Dimensions
Sanitary Size OD of Flange End ID of Tube OD of Tube
1/2″ 0.992 0.370 0.500
3/4″ 0.992 0.620 0.750
1″ 1.984 0.870 1.000
1 1/2″ 1.984 1.370 1.500
2″ 2.516 1.870 2.000
2 1/2″ 3.047 2.370 2.500
3″ 3.579 2.870 3.000
4″ 4.682 3.834 4.000
6″ 6.562 5.782 6.000
8″ 8.602 7.782 8.000
10″ 10.570 9.782 10.000
12″ 12.570 11.760 12.000

Questions & Answers 8

Questions and answers of the customers

  1. Q Best material for high pressure, 750 psi and temperature, 200F?
    A At that temperature, you can utilize any of our gaskets. For that level of pressure, we recommend our double-pin high-pressure clamp.
  2. Q Are there any animal origin materials used in your gaskets?
    A Our gaskets are comprised of 100% synthetic materials.
  3. Q What is the benefit of Tri-Clamp Envelope gaskets?
    A The reason for choosing the Envelope Gasket is because Teflon, by itself, is kind of a rigid material. EPDM on the other hand is very flexible. This gasket is an EPDM gasket center with Teflon outside. It works great in environments where you need the durability to stand up to harsh chemicals that Teflon provides but the flexibility that EPDM offers.
  4. Q These gaskets are class IV rated. What does class IV rating mean?
    A Class IV gasket rating is a certificate stating that the material used within gaskets is not harmful to living things. While gasket material should not wind up in the manufacturer's final product if it did find its way to the consumer it would not be harmful to ingest.
  5. Q Best gasket material for high proof ethanol?
    A We recommend EPDM gasket material for any alcohol process line implementations including ethyl alcohol.
  6. Q I’ve noticed leaking at a couple of connection points. All tri-clamp fittings and gaskets are new. Clamps are tight. What can I do to eliminate the leakage?
    A With regards to any leaking tri-clamp fittings, start by checking that the gasket is properly seated in the grooves. Depending upon the material of gasket, sometimes less flexible gaskets can bend/flex in a bad way if it's overtightened. I would check to make sure that you are not going about 1 full turn past "snug". Give these things a try and see if they help.
  7. Q What is the country of origin for these gaskets?
    A The country of origin for our tri-clamp gaskets is the United States. For your reference, the HTS code is 3926.90.4500.
  8. Q Are the PTFE tri-clover gaskets FDA approved?
    A Yes! Our tri-clamp gaskets are approved by the Food & Drug Administration for use in the production of food, beverage and pharmaceutical industries. We can supply a certificate stating as such upon demand. Additionally, these gaskets are also Class VI tested by USP to be in compliance with their testing criteria. We can also supply a certificate stating as such.

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