What is the thread for the steering wheel nut.

[Phil Waterman]

Hi Jim

Refresh my memory what are you working on? Do you need the nut or retread the shaft?

Cheers Phil

NOW I see that your question is in the CARRIER heading.

[RichardT10829]

Canadian pattern universal carrier steering box nut that holds the steering wheel on, Jim needs the nut, or the correct thread so he can make another.

[Jim Burrill]

Mechanic offered a possible way to check..... embed the thread in a block of plasticene. (Modelling clay) which i happen to have some in the shop.

I will brace the back and impress the front along the threads. That will give him something to neasure.

His tools have BSF and BSW but he said they weren't matching up with the sample nut (original CTL part on loan) nor SAE or Metric.

For BSF, he said it should be 55 degree pitch, and it doesn't match that.

Have I stumbled across some odd thread only used to trap the steering wheel on the shaft? I really doubt that - - but odder things have happened!

[Michael R.]

Have you considered BSP ?

[Chris Suslowicz]

Originally Posted by Michael R.

Have you considered BSP ?

Or National Pipe Thread (U.S. NPT), because 16tpi and 60 degree threadform seems to match that exactly:

http://www.engineeringtoolbox.com/np...ads-d_750.html

[Stew Robertson]

Pipe thread is tapered
The thread in the nut can be turned on a lathe then the cap tig welded on to match the under cut in the nut
clean up, the welds and presto you have a steering wheel nut almost original
or maybe it is
the cap is a piece of light gauge metal like a frost plug

[Lynn Eades]

3/4 NPT is only 14 tpi. It will be 3/4 U.N.F. (16 tpi)
When quoting U.N.F. or U.N.C. it is not required to quote the inclusive angle of the thread. They are all 60 degrees while the standard British threads are 55 degrees.

[rob love]

Originally Posted by Stew Robertson

Pipe thread is tapered

Not quite true. NPT (National Pipe Tapered) is tapered, NPS (National Pipe Straight) is straight.

[motto]

Originally Posted by Jim Burrill

Have I stumbled across some odd thread only used to trap the steering wheel on the shaft? I really doubt that - - but odder things have happened!

It's quite possible that this comment is closer than you think Jim.
I haven't checked it out completely but the nut that holds the steering wheel on the Chev CMP seems to be an oddity and I believe to be the same as the CCKW which appears to be the same as Dodge WC and I think M37 and who knows how many others. These are tubular shafts but I would imagine the U/C had a solid shaft. However:
To approach the question from a different angle perhaps you could give a description of the original example in your possession and see if it compares with anything else out there.

David

[brengunman]

Just checked my Canadian built Mk II. It appears to be standard 3/4 - 16 NF with 60 degree threads. The manuals show that there is a different steering box for British units.
George

[Lynn Eades]

I think all 3 steering boxes (Canadian, Brit, and Australian) all take the same nut.