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Old 10-09-2016, 17:48   #1
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O-ring size for Airmar ST-850 transducer.?

Insert diameter is 1 1/4 inch, groove depth is about 2 mm,
Which size should go, owners manual just says "small o- ring" , because larger ones are used for housing.
Anybody knows the size?
Thanks in advanced.


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Old 10-09-2016, 18:13   #2
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Re: O-ring size for Airmar ST-850 transducer.?

You should use the old one to select a new one from an O ring kit.
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Old 10-09-2016, 18:22   #3
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Re: O-ring size for Airmar ST-850 transducer.?

Quote:
Originally Posted by Guy View Post
You should use the old one to select a new one from an O ring kit.

Good answer.


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Old 10-09-2016, 19:33   #4
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Re: O-ring size for Airmar ST-850 transducer.?

Lacking a kit from which to choose, o-rings are cheap enough from places like McMaster that you can order a few in the correct size range and try them.
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Old 10-09-2016, 23:54   #5
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Re: O-ring size for Airmar ST-850 transducer.?

Surely there is a bearing and seal supply house somewhere near you in MdR. If you have the old O-ring, take it to such a place and they will either have one in stock or have the gauge to determine the size correctly. Buy several... they will be really cheap... put the spares in a Zip lock with a label as to what it fits. You will be glad a few years from now when you need another one!

If you don't have the old one, take the transducer. The folks behind the counter are much better at determining the right diameter and cross section that we amateurs are.

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Old 11-09-2016, 03:29   #6
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Re: O-ring size for Airmar ST-850 transducer.?

take the plug to HomeDespot... same o-rings as the transducer! or just measure it... use it and replace!
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Old 11-09-2016, 08:29   #7
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Re: O-ring size for Airmar ST-850 transducer.?

Thank you so much,
I have old one but stretched and hardened, debating between 2 sizes.
I'm gonna ask a guy behind the counter.
Thanks again!


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