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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Cotter pin size?

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plasticmaster

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Posted: 03/15/19 11:12am Link  |  Quote  |  Print  |  Notify Moderator

I'm headed to hardware store to get cotter pins to repack my wheel bearings. Does anyone know the typical size cotter pin used for the castle nut? I'm at work right now and don't have access to camper. Thanks.

2oldman

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Posted: 03/15/19 01:16pm Link  |  Quote  |  Print  |  Notify Moderator

Hardware store should know.. or google.

Iraqvet05

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Posted: 03/15/19 01:17pm Link  |  Quote  |  Print  |  Notify Moderator

This probably varies by manufacturer and axle rating but try a 1/8" x 1 3/4" first. I pulled that size from Dexter.


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SidecarFlip

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Posted: 03/15/19 01:24pm Link  |  Quote  |  Print  |  Notify Moderator

Get an assortment they are cheap.


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D.E.Bishop

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Posted: 03/15/19 03:52pm Link  |  Quote  |  Print  |  Notify Moderator

Not to hijack the thread because he got the best answer, buy the assortment package. But to continue, without using any help, who invented the cotter pin, the correct name for which is cotter key, and what were they originally used for?

The answer may surprise you.


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bob213

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Posted: 03/15/19 08:27pm Link  |  Quote  |  Print  |  Notify Moderator

2" x 1/8 for my 3500lb axles

Edited to correct [emoticon]

* This post was edited 03/16/19 11:04am by bob213 *


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opnspaces

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Posted: 03/16/19 01:20am Link  |  Quote  |  Print  |  Notify Moderator

Honestly if the bearings are adjusted correctly there is no turning force on the nut. Unless you destroy the original you can probably get away with reusing it.


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JIMNLIN

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Posted: 03/16/19 08:54am Link  |  Quote  |  Print  |  Notify Moderator

The pin is there on a very good reason.....to keep the adjustable nut in position...and yes they can back off without a pin destroying the bearings/axle stub/hub over time. I've seen this happen on trailers in commercial service. RV trailers would be no different as all the axles are the same brands.

Trailer axles use different size cotter pins depending on axle brand and axle size.


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Posted: 03/17/19 08:13pm Link  |  Quote  |  Print  |  Notify Moderator

opnspaces wrote:

Honestly if the bearings are adjusted correctly there is no turning force on the nut. Unless you destroy the original you can probably get away with reusing it.


I always use them till the bitter end! Exactly what you said about it doesn't take much at all to hold the nut.

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Posted: 03/18/19 07:46am Link  |  Quote  |  Print  |  Notify Moderator

I have reused cotter keys on boats and trailers as long as I can remember. Unless it has been work hardened to the breaking point or so bent up it’s hard to get through, I have never seen a reason not to reuse one.


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