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Prop Nut

Old 10-15-2018, 02:09 AM
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Default Prop Nut

I found a boat on the hard this weekend that had a special type of locking prop nut. I took a picture and did a web search but I have had no luck finding a source for them. Anyone know a vendor for this type of nut and what they are actually called?

Thanks,
Scott
Old 10-15-2018, 02:19 AM
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What's "the hard"?
Old 10-15-2018, 02:31 AM
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Originally Posted by BoatP2Lee View Post
What's "the hard"?
Opposite of "the soft"?
Old 10-15-2018, 03:52 AM
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What you are looking at is a "home made solution" to someone having installed the wrong length shaft, possibly wrong diameter bore prop.
It belongs under water, where nobody can see it
Old 10-15-2018, 04:29 AM
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Originally Posted by BoatP2Lee View Post
What's "the hard"?
Land.
Old 10-15-2018, 04:35 AM
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That's called a split nut. A local machine shop used to favor them over nylock type nuts on shaft couplings, that's the first time I've seen one used at the prop end.

Easy to make, they saw cut halfway through the nut then drill and tap a couple of set screws that expand the nut when tightened, binding the threads.
Old 10-15-2018, 06:10 AM
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Looks like a PropSmith set up.
Old 10-15-2018, 07:02 AM
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Originally Posted by keysdiver View Post
What you are looking at is a "home made solution" to someone having installed the wrong length shaft, possibly wrong diameter bore prop.
It belongs under water, where nobody can see it
Not a home made solution at all. The pictured vessel is a 2018 52 Viking that was delivered to Bluewater last spring for their boat show. There was another 2016 Viking next to this one (probably a 58-60 ft) and had a larger shaft but same nut configuration.

Scott
Old 10-15-2018, 07:10 AM
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Originally Posted by bills106 View Post
That's called a split nut. A local machine shop used to favor them over nylock type nuts on shaft couplings, that's the first time I've seen one used at the prop end.

Easy to make, they saw cut halfway through the nut then drill and tap a couple of set screws that expand the nut when tightened, binding the threads.
Split nut Thanks! Going to call Bluewater today to see if they have one for a 2-1/4" shaft. I'm tired of tightening my loose nuts the water is getting cold!

Scott
Old 10-15-2018, 07:29 AM
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Originally Posted by sfaatz View Post
Split nut Thanks! Going to call Bluewater today to see if they have one for a 2-1/4" shaft. I'm tired of tightening my loose nuts the water is getting cold!

Scott
They probably won't have one on the shelf but any machine shop can make the mods to a prop nut in pretty short order
Old 10-15-2018, 09:00 AM
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When it is cold your "nuts' shouldnt be loose. They actually shrivel. 😂
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