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Old 29-06-2016, 12:46   #1
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What's my shaft?

Hello experts!

I want to buy a new propeller, needs to know what kind of shaft do I have.
The diameter I measured is 32mm. My engine is a Yanmar 50hp (4jh2B).
Flexofold seller told me there's 3 types (SAE, ISO and IMP). SAE and IMP has 1 1/4 (31,75mm), but they are Taper. As far as I know, my shaft is not tapered.
So:
Does the shaft comes with the engine?
Is It usual a shaft be taper?
Do I need to have a very specific shaft to fit a propeller?

TKs a lot!!!
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Old 29-06-2016, 13:06   #2
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Re: What's my shaft?

I will tell you that you do not have a 32mm diameter shaft. 1.25" maybe. But not 32mm.
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Old 29-06-2016, 13:29   #3
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What's my shaft?

And no, shafts do not typically come with the engine. Shafts are made to specific lengths for specific boats. Yes your shaft is tapered, but only at the end that's attached to the propellor.

Best bet, pull the old prop and have it measured by a prop shop


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Old 29-06-2016, 13:46   #4
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What's my shaft?

Check the type of propellor you have, make, serial nº, pitch, diam and check with the manufacturer. They can tell you what taper the propellor was made with. Use that for ordering your new one. Better is to take it off and measure.


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Old 29-06-2016, 15:18   #5
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Re: What's my shaft?

Quote:
Originally Posted by fstbttms View Post
I will tell you that you do not have a 32mm diameter shaft. 1.25" maybe. But not 32mm.
Even in Europe?
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Old 29-06-2016, 15:29   #6
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Re: What's my shaft?

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Originally Posted by FSMike View Post
Even in Europe?
Metric shaft diameters come in 5mm increments- 25mm, 30mm, 35mm etc. there is no 32mm size. But 32mm does equal 1.26", so assuming a slight error in reading the slide caliper, the OP likely has a 1.25" diameter shaft.
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Old 29-06-2016, 15:35   #7
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Re: What's my shaft?

Quote:
Originally Posted by FSMike View Post
Even in Europe?
Probably. Here is a link to cutlass bearings for most yacht sized shafts which also has the shaft diameters.

http://www.sillette.co.uk/price_pdf_...s_bearings.pdf

Not sure were the 1:14 prop shaft taper comes from. In the UK metric shafts have 1:10 and imperial have 1:12 tapers.


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Old 29-06-2016, 19:26   #8
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Re: What's my shaft?

Well, Till now, I think the only way to know more about is to retrieve my actual prop.
I just bought a digital caliper to cross check my measurement.
Tks by now !
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Old 01-07-2016, 20:39   #9
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Re: What's my shaft?

Quote:
Originally Posted by fstbttms View Post
Metric shaft diameters come in 5mm increments- 25mm, 30mm, 35mm etc. there is no 32mm size. But 32mm does equal 1.26", so assuming a slight error in reading the slide caliper, the OP likely has a 1.25" diameter shaft.
Got it. Thanks.
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Old 01-07-2016, 22:15   #10
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Re: What's my shaft?

Handy inch-metric comparison

https://www.dropbox.com/s/s0diw6xidq...c-SAE.pdf?dl=0
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