430 Pipe Mount Thermostat Switch

430 Pipe Mount Thermostat Switch

Senasys offers a variety of pipe mount thermostat switches. Available in our auto reset, manual reset and epoxy sealed series, the pipe mount thermostats have become a popular item for many of our customers. Typically when mounting the switch to the outer diameter of the pipe, the switch is sensing a fluid temperature or air temperature as it passes through. The snap disc reacts quickly to the change and opens or closes the circuit. We offer a variety of materials to fit application requirements including aluminum and brass. Give us a call for for more information or visit our online store to purchase.

There are various sizes that we have available for these switches:

430 & 432 431 2570
3/16″ .187 OD 3/8″ .375 OD 3/8″ .375 OD
1/4″ .250 OD 7/16″ .437 OD 1/2″ .500 OD
3/8″ .375 OD 1/2″ .500 OD 5/8″ .625 OD
7/16″ .437 OD 5/8″ .625 OD 3/4″ .750 OD
1/2″ .500 OD 7/8″ .875 OD 7/8″ .825 OD
5/8″ .625 OD 1-1/8″1.125 OD 1″ 1.000 OD
7/8″ .875 OD
1-1/8″1.125 OD

Other diameters and materials are available, please contact us.

Thermostat matches the actual O.D., not the nominal dimension

For our pipe mount thermostats if you are using an industry standard tube you need to get the thermostat that matches the actual OD not the nominal dimension listed when they sell the pipe.  So, if you have an standard ‘1/2″ pipe’, per the chart below you will need a 5/8″ pipe mount thermostat as the nominal 1/2″ pipe have an actual OD of 5/8″ and our units are sold by that actual dimension.

Here’s a quick reference guide:


Copper Water Tubes ASTM B88
Nominal Size
Actual Outside Diameter
3/8 1/2, 1/4, 3/8, 5/8 0.5, 0.25, 0.625, 0.825
1/2 5/8 0.63
5/8 3/4 0.75
3/4 7/8 0.88
1 1 1/8 1.13
1 1/4 1 3/8 1.38
1 1/2 1 5/8 1.63
2 2 1/8 2.13
2 1/2 2 5/8 2.63
3 3 1/8 3.13
3 1/2 3 5/8 3.63
4 4 1/8 4.13
5 5 1/8 5.13
6 6 1/8 6.13

In addition, there are a few rules of thumb to keep in mind when we are talking abut how to make sure that the pipe mount is properly secured, and has the ability to make the best contact with the switch and the pipe.

  • Use thermal paste for heat transfer
  • Use the OD of the pipe or tube to size correctly
  • Make sure there is NO air gap between the switch and the pipe
  • If you need to shim, always shim between the pipe and the clip do NOT shim between the switch and the pipe

How to properly determine your pipe mount size, click here!

To view our standard pipe mount thermostat options visit our online store.

For more information about our pipe mount thermostats, contact our direct technical support at 715-831-6353.

For information about our snapdisc switches in general, take a look at our catalog.

Senasys designs and manufactures snap disc thermostat switches. Senasys switches are UL and CUL Recognized. The majority of our switches are made in the United States and our direct customer service would be happy to help you find the right switch for your application. Senasys snap disc thermostats are single pole, single throw, fixed thermostat which may be used in applications such as industrial and HVAC equipment.

Pipe Mount Thermostat Switch Options Purchase pipe mount thermostat switches Contact us about our epoxy sealed thermostats.


3 Responses

  1. do you make a 1″ copper pipe snap switch that closes at approximately 100 degrees and opens below 100 degrees,it is used to control power to a thermostat.

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