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Standard Size Thermocouple Connectors

Standard Size Thermocouple Connector Most Popular Round Pin TC Connector

$7.40

Item# OSTW-J-M-S-NL

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $7.40
10-49 $7.03
50-99 $6.66
100-999 $6.29
1000-4999 $5.92
5000+ $5.55

In stock

Lead Time (If not in stock): 20 weeks
Standard Size Thermocouple Connector Most Popular Round Pin TC Connector OSTW-J-M-S-NL OSTW-J-M-S-NL
  • Universal Female Works with Standard Round Pins or Miniature Flat Pins
  • Quick Connect Contact Washers
  • ANSI or IEC Color Coded
  • Hollow-Pin Construction
  • Accepts Stranded or Solid Wire up to Size 14 AWG
  • Glass-Filled Nylon and Liquid Crystal Polymer Connectors are Mutually Compatible -- as Well as with All Industry Standard Size Connectors
  • OSTW Series Rated to 180&degC (356&degF)
  • HST & HSTW Series Rated to 260&degC (500&degF)
  • Available with Quick Wiring Caps-- Simply Insert Wires in Caps and Tighten Screws
  • Captive Cover Screws

OSTW-J-M-S-NL 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.

Sensing Type
Thermocouple Calibration Type
Temperature Max
Temperature Range
Connector Gender
Calibration Standard
RoHS Compliant
Additional Features
Connector Style
Temperature Unit
Temperature Min
No. of Pins/Sockets


  • Maximum Ambient Temperature OSTW Series Rated to 180°C (356°F)
  • Maximum Wire Size 14 AWG
  • Wire Type Stranded or Solid
OSTW Series connectors are standard size round pin 2 pole TC connectors. They connect or extend TC wire and cable to thermocouple sensors, temperature instrumentation and process controllers.This popular series of TC connector is available in all thermocouple calibration code colors. The contact washer feature allows the installer to use a straight wire strip. This greatly cuts installation/termination time and eliminates the torque that is normally associated with wire that is looped around a termination screw.
OSTW-( )-F female jack is Universal it will accept standard size round pin or mini size flat pin male TC connector plugs.

Some other designs:
SMPW_SMP_HMP_HMPW">Mini size flat 2 pin TC connector design.
OTP">Round pin 3 pole, 3 prong TC connector shape.
MTP">Flat pin 3 pole, 3 prong TC connector shape.

Examples of pricing for popular models is referenced in the "To Order" box. Use the "Part Number Builder" below to get pricing for all available models.
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Rated 5 out of 5 by from Thermocouple plugs I would not have bothered to review these, but I have been buying only this brand for years. We like the terminal connection inside, but what I like best is the cord securing segment. It is cut away inside the body so it actually secures the wire when the 2 halves are screwed together. We actually use these for low voltage plugs vs thermocouple connections, using an 18 ga 2 wire sjoow cable. Simple, cheap, rugged.
Date published: 2016-10-07
Rated 4 out of 5 by from preforms as expected used a a thermocouple quick connect preforms as expected
Date published: 2021-04-22
Rated 5 out of 5 by from Great Features delivered on time. worked well on what we needed for our project.
Date published: 2018-10-19
Rated 5 out of 5 by from A better design In our test chambers TC connectors are exposed to wide temperature swings. With the connector we previously used, the TC wire is wrapped around a screw used for securing the wire. With this design the TC wire and screw become loose over time from the changes in temperature. The design of the Omega connector secures the TC wire between two nonrotating surfaces that are compressed with a screw. We have used the Omega connectors for over two years now and no longer have problems with loose TC connections.
Date published: 2022-08-12
Rated 5 out of 5 by from Keep it simple!! Easy and solid wire terminations in the field. Multiple application uses.
Date published: 2021-01-13
Rated 5 out of 5 by from The right stuff! The plug adapters worked great. My biggest challenge was to find a company that produces the proper size I needed. Omega fill the bill, Thanks
Date published: 2019-04-17
Rated 5 out of 5 by from Works great I bought this a little over a month ago, the male and female plugs work perfectly. Easy to attach wires and have rubber fitting to keep moisture out. Would buy again
Date published: 2019-03-25
Rated 5 out of 5 by from Great (Large Body) connectors I really like these connectors, and use them when instrumenting larger equipment for testing. They are large enough to handle easily when connecting Tc's to them.
Date published: 2017-10-31
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