sadler 26 propshaft nut, what size and where to get one?

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Focused1

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My prop shaft nut has rounded today whilst changing my prop, can anyone advise the size of this nut? and where to get one?
I'm located in Kent.
The boat is now on the hard standing. It was supposed to be a simple lift, bottom clean, anode change, prop change, re-launch. Now my pockets are much emptier than I wanted them to be.
thanks to anyone who can give any advice.
 
If I was unsure what diameter and thread type the nut was I would take the nut to the local hardware store who has a board with all size bolts and threads and he would say it is 25 ml metric (coarse) or 1 inch Imperial thread for example. (If it is Volvo it would be metric?)

I find it fairly easy to check the diameter because I bought a digital vernier gauge on eBay from China for 13 AUD !
My BIL is a diesel fitter can tell what type of thread it is just by looking at it.
 
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I don't know how standardised Sadler's products were, but I'd take the existing nut off, this sounds like a job for a pair of Stilsons, and measure pitch and diameter of the actual thread. Perhaps confirm with a nut from the local hardware merchants, as suggested, although non-metric will be hard to find locally if that's what you need.
T, Norris or Silette-Sonic would probably be able supply a prop-nut once told the thread.
 
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Thinking you might not be registered on the SSOA TD forum, and that if you were not it might take time to become so to do a search, I did a quick one and found one thread from which there seems to be a lot of potential variation – amongst it, 5/8” BSF (14 tpi) and 5/8” BSW (11 tpi) were both mentioned in relation to original 1” shafts on S29’s and S34’s (I could not see anything on S26’s specifically).

I don’t know if that helps at all, but good luck!
 
Hydrozoan said:
there seems to be a lot of potential variation – amongst it, 5/8” BSF (14 tpi) and 5/8” BSW (11 tpi) were both mentioned in relation to original 1” shafts on S29’s and S34’s (I could not see anything on S26’s specifically).
Click to expand...
And my 1" shaft, (not a Sadler) has an M16, 2mm pitch thread.
 
earlybird said:
And my 1" shaft, (not a Sadler) has an M16, 2mm pitch thread.
Click to expand...

Yes, "amongst it" there was an imperial/metric combination too, IIRC - but whether it was a standard Sadler (or Starlight) set-up I can't recall. Sure, the OP will have to get it off measure, but I thought it might help a bit to post what I found.
 
Thanks for the replies everyone.
I miss stated the problem, its stripped threads rather than rounded. So the nut is off the shaft.
But the replies have been very helpful none the less. T-norris sell the nuts so thanks for that one. Im also guessing the thread will be 5/8 BSF or BSW as suggested by Hydrozoan.
In this instance im quite embarrassed to say im a mechanical engineer and a toolmaker, but my knlowledge of imperial threads is poor. If its not metric then i need a vernier and a thread gauge to know the size. Vernier and thread gauge is at work and work is closed until monday. As impatient as i am, i wanted to get one today.
I did take it into the local marine engineer/shop to identify the thread but they were absolutely useless. Didnt have a vernier to check the size, or a bolt that fitted it, or the securing split pin!
Its the original 1" shaft fitted to a bukh dv10 so it just has to be one of the sizes stated by yourself hydrozoan. But now i have no choice but to wait until monday so i will measure it before ordering.
What i can see after cleaning the nut up is that it is completely dezincified. So basically its a copper nut!
On a side not Hydrozoan im not sure if you are a member of the sadler and starlight forum but i have tried to register 3 or 4 times over the last few years and i never get authorised so i have given up on that one.
 
 
Focused1 said:
Thanks for the replies everyone.
I miss stated the problem, its stripped threads rather than rounded. So the nut is off the shaft.
But the replies have been very helpful none the less. T-norris sell the nuts so thanks for that one. Im also guessing the thread will be 5/8 BSF or BSW as suggested by Hydrozoan.
In this instance im quite embarrassed to say im a mechanical engineer and a toolmaker, but my knlowledge of imperial threads is poor. If its not metric then i need a vernier and a thread gauge to know the size. Vernier and thread gauge is at work and work is closed until monday. As impatient as i am, i wanted to get one today.
I did take it into the local marine engineer/shop to identify the thread but they were absolutely useless. Didnt have a vernier to check the size, or a bolt that fitted it, or the securing split pin!
Its the original 1" shaft fitted to a bukh dv10 so it just has to be one of the sizes stated by yourself hydrozoan. But now i have no choice but to wait until monday so i will measure it before ordering.
What i can see after cleaning the nut up is that it is completely dezincified. So basically its a copper nut!
On a side not Hydrozoan im not sure if you are a member of the sadler and starlight forum but i have tried to register 3 or 4 times over the last few years and i never get authorised so i have given up on that one.
Click to expand...

I don’t think you should assume that a 1” shaft means absolute certainty of a 5/8 BSF or BSW, but that seemed the most likely from what I saw on the SSOA TD Forum.

Yes, I got the impression you were in a hurry :) and thought that just directing you there might be less than helpful, because I thought (at the time I posted) that if you were not registered you might not be able to use the search facility. I have since found that you can. (But I was also concerned not to mislead you, as I’m not well up with shafts, props and nuts!)

I’m not sure what the registration issue is, and that forum is not run directly by the SSOA but is a Gamalan/Mike Lucas ‘production’ I believe. Did you try this page for registration?
http://sadlerandstarlight.gamalanhost.net/register.asp

If you did and it has not worked, please confirm and I’ll post on the forum to ask for advice, and then report back here or by PM to you.

Anyway, I’m glad that you’re making progress and that the replies have helped.
 
I am almost certain its 5/8 now or about 15.8mm in modern money. I just had to find out and so after a few phone calls managed to find someone with a vernier i could borrow.
I also checked out the sadler forum and found a post specifically about a sadler 26 prop shaft nut and another possible supplier.
Thanks for all your help and i will give the link you posted a try.
If it does not work then i will report back.
Thanks once again.
 
Focused1 said:
... I also checked out the sadler forum and found a post specifically about a sadler 26 prop shaft nut and another possible supplier.
Thanks for all your help and i will give the link you posted a try.
If it does not work then i will report back.
Thanks once again.
Click to expand...

Good - and sorry my quick search missed that S26 post.
 
Apology not needed, but i now need to apologise because reading it again the post is not about a sadler 26 but a sadler 32. Its been a long day! But at least i know the size is 5/8 and a couple of possible suppliers. I will check the thread size at work on monday before i order and will report back incase anyone else ever needs a prop nut for a sadler 26!
Thanks all
 
Identication of thread pitch is easy with a thread gauge, inexpensive off eg. eBay

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So just as a follow up. The nuts thread was 5/8 BSF. I got one from lake engineering for £10. Luckily i asked for the nuts dimensions before ordering because the new nut is different to the original. I had already measured the old nut with a vernier and so was able to work out that a 3mm washer would be needed to allow the slots in the nut and the hole in the shaft to line up. The brass washer was also supplied by lake engineering for £3. They also supplied the 1/8 split pin for £1.
Thanks everyone for your help.
 
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