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Bolt-On Thermocouple with SS Washer Housing

Bolt-On Washer Thermocouple Assemblies


Item# WTJ-8-12-TT

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $17.56
10-24 $16.68
25-99 $15.80
100-499 $14.93
500-999 $14.05
1000+ $13.17

In stock

Lead Time (If not in stock): 4 weeks
Bolt-On Washer Thermocouple Assemblies WTJ-8-12-TT WTJ-8-12-TT
  • Very Economically Priced
  • J, K, T, and E Thermocouple
  • New Rugged Design
  • For #6, #8, #10 and 1/4' Screw Sizes

WTJ-8-12-TT Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Thermocouple Type
Process Temperature Range
Cable Insulation
Termination Connection Type
Cable Length
Additional Features
Mounting Style
Probe Diameter
Minimum Temperature Measurement
Sensor Application
Color Code Standard

A versatile thermocouple assembly that easily mounts to a variety of surfaces. Utilizable for a number of surface temperature measurement applications where fixed mounting is possible.

Model No.
300 mm (12") L
Model No.
600 mm (24") L
Model No.
900 mm (36") L
Model No.
1500 mm (60") L
Washer Hole
Diameter mm (inches)
Nominal Screw Size
WT(*)-6-12 WT(*)-6-24 WT(*)-6-36 WT(*)-6-60 3.68 (0.145) #6 M3.5
WT(*)-8-12 WT(*)-8-24 WT(*)-8-36 WT(*)-8-60 4.32 (0.170) #8 M4
WT(*)-10-12 WT(*)-10-24 WT(*)-10-36 WT(*)-10-60 4.95 (0.195) #10 M4.5
WT(*)-14-12 WT(*)-14-24 WT(*)-14-36 WT(*)-14-60 6.60 (0.260) 1/4 in M6
WT(*)-6-12-TT WT(*)-6-24-TT WT(*)-6-36-TT WT(*)-6-60-TT 3.68 (0.145) #6 M3.5
WT(*)-8-12-TT WT(*)-8-24-TT WT(*)-8-36-TT WT(*)-8-60-TT 4.32 (0.170) #8 M4
WT(*)-10-12-TT WT(*)-10-24-TT WT(*)-10-36-TT WT(*)-10-60-TT 4.95 (0.195) #10 M4.5
WT(*)-14-12-TT WT(*)-14-24-TT WT(*)-14-36-TT WT(*)-14-60-TT 6.60 (0.260) 1/4 in M6
*Specify calibration: J, K, T or E. Stripped leads are standard.

Washer Dimensions
#6 and #8 screw size: 22 L x 6.5 mm W (0.875 x 0.250")
#10 and 14" screw size: 25 L x 9 mm W (1 x 0.360")
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Rated 5 out of 5 by from Just what we needed These thermocouples were the form factor we needed for our application. They will work great
Date published: 2023-01-24
Rated 5 out of 5 by from just what I needed the part was out of stock but they still came in a timely manner and worked as excepted, will be a repeat customer
Date published: 2022-11-17
Rated 5 out of 5 by from Rock-On for the Bolt-On Washer! The part met our specs precisely and was in great condition and appropriately priced.
Date published: 2022-11-03
Rated 5 out of 5 by from Solid thermocouple So far so good with this thermocouple. One recommendation I do have, double/triple check the connector before ordering. I thought I ordered the right one, but ended up having to order a replacement. Top to Omega, add images of the termination chosen to the spec wizard.
Date published: 2021-01-04
Rated 5 out of 5 by from Technical staff helped me get all the right parts! Just what I was looking for! Great support from your technical staff!
Date published: 2020-08-23
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loading all QA

Does the 0°F lower process limit apply to thermocouple types other than type J? (e.g. can a type T version of the 'WT' sensor accurately measure temperatures below 0°F?)

Asked by: KirkR
Thank you for your inquiry. We do not state an accuracy for SLE Wire-Made Products below 0°C (32°F). Can they measure below 0°C? The answer is YES, however, accuracy shows it is no longer linear. If you want an accuracy for a SLE Product we suggest that you get a CAL-4 Calibration Report at an additional cost for temperatures below 0°C.
Answered by: Application Engineer CB
Date published: 2023-03-01

Two Questions: 1. Where is the thermocouple measurement made? Can you cut off the bolt hole without affecting the performance? 2. Are these made in an un-bent configuration?

Asked by: bchynoweth
Thank you for the inquiry. The thermocouple tip ( sensing portion of the TC) is pressed within the washer. You will notice the small channel on the shoulder of the washer. You could cut off the bolt hole being careful not to cut in to the channel. We do not offer a flat version. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2020-04-23

Hello, Does this thermocouple UL listed/certified? If so, can you tell me the UL file No? Thanks,

Asked by: Thomson
Thank you for your inquiry Thomson. No, this thermocouple is not UL listed/certified.
Answered by: Application Engineer SP
Date published: 2022-10-20

What are the wire colors WTJ-6-36-TT

Asked by: theegg
Thank you for your inquiry! The WTJ-6-36-TT is a type J thermocouple so the wires will be red and white.
Answered by: Application Engineer JM
Date published: 2021-02-17

Are any of these t/c made with stranded wire? I need something that is flexible. If so, what is the Dynamic Bend Radius?

Asked by: Greg B
Hi Greg, These are all made with solid wire. Please use 3 x wire diameter for minimum bend radius. Thinner wire will hold up longer. You might consider the SA1-K or the SA1XL-K as alternate. Best regards OMEGA
Answered by: AENorwalk
Date published: 2020-04-09
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