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Thermowells & Accessories
Extend the life of your temperature sensors and improve system reliability with our durable thermowells and accessories. Designed to shield thermocouples, RTDs, and other sensors from pressure, flow, and corrosive media, thermowells allow accurate measurement without exposing instruments to harsh process conditions. Our selection includes threaded, flanged, weld-in, and sanitary thermowells, along with mounting hardware and protective accessories to meet your installation needs. Available in multiple materials, lengths, and bore sizes, these products are ideal for chemical processing, power generation, water treatment, food and beverage, and general industrial applications. With rugged construction, easy installation, and trusted-brand performance, our thermowells and accessories provide long-lasting protection, dependable accuracy, and lower maintenance costs in demanding environments.
Filters 387 Results
387 items
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The Dwyer - 1/2-260S-U101/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 12 ", 10-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$139.17
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U41/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 6 ", 4-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$76.70
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-14-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.25 " OD, and 0.194 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$20.60
$18.93
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-316-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.187 " OD, and 0.132 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$19.50
$17.92
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U221/2-316SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 316 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 24 ", 22-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$416.18
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U21/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$58.94
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U21/2-316SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 316 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$87.69
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-14-6OPEN is a Standard Protection Tube featuring Miniature, 316 SS, Open Sensing End, 6 " L, 0.25 " OD, and 0.194 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$15.80
$14.52
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U101/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 12 ", 10-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$144.31
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U41/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 6 ", 4-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$76.70
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U21/2-304SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 304 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$65.15
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-18-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.125 " OD, and 0.07 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$22.53
$20.70
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - INC-316-6OPEN is a Standard Protection Tube featuring Miniature, Inconel 600, Open Sensing End, 6 " L, 0.187 " OD, and 0.132 ". It is rated for a temperature range of 1150 °C (2100 °F). Part of the INC Series. Sold individually.
Save 8%$37.40
$34.36
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-38-18CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 18 " L, 0.375 " OD, and 0.32 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$44.29
$40.69
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U41/2-BRASS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring Brass, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 6 ", 4-1/2 ", 5000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$88.90
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U21/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$58.94
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U21/2-BRASS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring Brass, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 5000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$65.60
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2BSP-260S-U101/2-316SS is a Standard Threaded Thermowell for 1/4 " Element featuring 316 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 12 ", 10-1/2 ", 1/2 " NPSM, and 1/2 " BSP. Part of the BSP Series. Sold individually.
$205.54
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-385S-U41/2-BRASS is a Standard Threaded Thermowell for 3/8 " Dia Element featuring Brass, 0.385 " Bore Dia, Straight, 49/64 " Shank Dia, 6 ", 4-1/2 ", 5000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 385S Series. Sold individually.
$63.57
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-516-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.312 " OD, and 0.26 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$21.33
$19.60
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-14-51CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 51 " L, 0.25 " OD, and 0.194 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$117.17
$107.65
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U131/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 15 ", 13-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$205.97
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U71/2-304SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 304 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 9 ", 7-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$123.45
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U41/2-316SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 316 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 6 ", 4-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$104.65
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U101/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 12 ", 10-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$139.17
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U41/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 6 ", 4-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$76.70
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-14-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.25 " OD, and 0.194 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$20.60
$18.93
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-316-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.187 " OD, and 0.132 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$19.50
$17.92
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U221/2-316SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 316 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 24 ", 22-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$416.18
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U21/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$58.94
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U21/2-316SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 316 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$87.69
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-14-6OPEN is a Standard Protection Tube featuring Miniature, 316 SS, Open Sensing End, 6 " L, 0.25 " OD, and 0.194 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$15.80
$14.52
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U101/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 12 ", 10-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$144.31
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U41/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 6 ", 4-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$76.70
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U21/2-304SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 304 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$65.15
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-18-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.125 " OD, and 0.07 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$22.53
$20.70
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - INC-316-6OPEN is a Standard Protection Tube featuring Miniature, Inconel 600, Open Sensing End, 6 " L, 0.187 " OD, and 0.132 ". It is rated for a temperature range of 1150 °C (2100 °F). Part of the INC Series. Sold individually.
Save 8%$37.40
$34.36
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-38-18CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 18 " L, 0.375 " OD, and 0.32 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$44.29
$40.69
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U41/2-BRASS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring Brass, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 6 ", 4-1/2 ", 5000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$88.90
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U21/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$58.94
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U21/2-BRASS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring Brass, 0.26 " Bore Dia, Straight, 1/2 " Shank Dia, 4 ", 2-1/2 ", 5000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$65.60
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2BSP-260S-U101/2-316SS is a Standard Threaded Thermowell for 1/4 " Element featuring 316 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 12 ", 10-1/2 ", 1/2 " NPSM, and 1/2 " BSP. Part of the BSP Series. Sold individually.
$205.54
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-385S-U41/2-BRASS is a Standard Threaded Thermowell for 3/8 " Dia Element featuring Brass, 0.385 " Bore Dia, Straight, 49/64 " Shank Dia, 6 ", 4-1/2 ", 5000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 385S Series. Sold individually.
$63.57
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-516-6CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 6 " L, 0.312 " OD, and 0.26 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$21.33
$19.60
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SS-14-51CLOSED is a Standard Protection Tube featuring Miniature, 316 SS, Closed Sensing End, 51 " L, 0.25 " OD, and 0.194 ". It is rated for a temperature range of 900 °C (1650 °F). Part of the SS Series. Sold individually.
Save 8%$117.17
$107.65
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260S-U131/2-304SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 304 SS, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 15 ", 13-1/2 ", 7000 psi, 1/2 " NPSM, and 3/4 " NPT. Part of the 260S Series. Sold individually.
$205.97
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 3/4-260W-U71/2-304SS is a Socket Weld Thermowell for 1/4 " Dia Element featuring 304 SS, 3/4 " Pipe Size, 0.26 " Bore Dia, Step Down, 3/4 " Shank Dia, 9 ", 7-1/2 ", 7000 psi, and 1/2 " NPSM. Part of the 260W Series. Sold individually.
$123.45
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - 1/2-260S-U41/2-316SS is a Standard Threaded Thermowell for 1/4 " Dia Element featuring 316 SS, 0.26 " Bore Dia, Step Down, 5/8 " Shank Dia, 6 ", 4-1/2 ", 7000 psi, 1/2 " NPSM, and 1/2 " NPT. Part of the 260S Series. Sold individually.
$104.65
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
FAQ
- A thermowell is a pressure-rated sheath that the temperature sensor (T/C or RTD) sits inside. The well is welded or threaded into the pipe or vessel, taking the process pressure. The sensor goes in and out of the well without breaking the process seal, which means you can change a sensor without draining or shutting down the line. Critical for any pressurized or hazardous service.
- Three things: material (316 stainless for most service, Hastelloy or Monel for corrosive, Inconel for high temperature), connection type (threaded NPT for low pressure, flanged for high pressure or hazardous service, weld-in for permanent installations), and U-length (insertion depth into the pipe, typically 1.5 to 2 times pipe diameter for accurate reading). Then check wake frequency.
- Wake frequency calculation checks whether the natural vibration frequency of the thermowell will resonate with the vortex shedding of the flowing fluid. Get it wrong and the thermowell vibrates itself off at the root, the sensor falls into the process, and you have a process leak and an unmeasured loop. ASME PTC 19.3 TW is the calculation standard. Any thermowell in fast-flowing service (steam, high-velocity gas, liquid hydrocarbons) needs the calculation done before install.
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About NISCO Inc.
NISCO offers a wide range of pressure gauges & instruments, diaphragm seals, thermometers, valves, and flow control products to the industrial and commercial marketplaces, as well as other resellers like ourselves. We can also provide other value-added services such as gauge repair, NIST traceable calibration, diaphragm seal assembly, and valve automation. NISCO takes pride in providing extensive product knowledge, helpful customer service, and market competitive pricing to help fit whatever need you may have because it is our goal to be regarded by our customers as the best supplier of pressure, temperature, and flow control products.