40C Idler wheel shaft thread size?

Bret4207 · Post by **Bret4207** » Mon Oct 21, 2013 6:31 am

Title says it pretty much. Need to chase out the idler wheel shaft threads, need to know the original size. Amazing what 60 years of siting does to threads!

Post by **Lavoy** » Mon Oct 21, 2013 7:21 am

Should be 3/4" NF.
Lavoy

Bret4207 · Post by **Bret4207** » Mon Oct 21, 2013 9:28 am

Thank you sir!

Bret4207 · Post by **Bret4207** » Tue Oct 22, 2013 5:20 am

Lavoy, tried it and my shaft is way bigger than 3/4". My largest die is 1" and it was shy by a good bit. I'm thinking 1 1/8" maybe. I'm talking the front idler wheel on a 3 roll.

Post by **Lavoy** » Tue Oct 22, 2013 8:13 am

Sorry, I assumed 4 or 5 roller. I don't know what thread that is, it is tapered like NPT, so I am not sure it is any sort of standard thread.
Lavoy

Bret4207 · Post by **Bret4207** » Tue Oct 22, 2013 10:22 am

Okay, thanks anyway!

Post by **Lavoy** » Tue Oct 22, 2013 12:30 pm

You could try 1" or 1 1/8" NPT, but that is purely a guess, be careful.
Lavoy

Bret4207 · Post by **Bret4207** » Fri Oct 25, 2013 6:47 am

Just an update- appears they are 1 1/8"-12NF. Gotta beg a loner tap and die someplace to chase threads.

Post by **Lavoy** » Fri Oct 25, 2013 8:22 am

The threads should have a taper to them.
Lavoy

jtrichard · Post by **jtrichard** » Fri Oct 25, 2013 4:02 pm

1 1/8" tapered sounds like 3/4" pipe ...3/4" pipe OD is around 1" to 1 1/8"

shinnery · Post by **shinnery** » Fri Oct 25, 2013 10:37 pm

3/4" NPT shows to have a 1.050 OD. and 14 TPI. At least that is what google tells me. If he runs a 1 1/8-12 tap thru it there will sure be no taper left then.
Bryce

Bret4207 · Post by **Bret4207** » Sat Oct 26, 2013 6:32 am

Updated update! 1 1/4"-12, no taper at all. My measurement was off from the galling that occurred taking it apart.

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40C Idler wheel shaft thread size?

40C Idler wheel shaft thread size?

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