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Old 28-04-2014, 13:39   #1
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Flanged & Castellated Prop Nut (A Myth?)

Hey All,
I'm changing the prop on my direct-drive A4. After some aquabatics I came up w/ the prop nut, a beautiful piece of hardware in brass, but a few of the castle tops (?) are broken off. Looking for a replacement it seems this type is extinct. I find castle nut, I find flanged hexes, but no castellated flanged hexes to fit a 1" prop shaft.

Any leads on where to source this are greatly appreciated. The attached mock-up does it no justice but this is essentially what it is. I'll post pics tomorrow, I forgot the piece on the boat.

Thanks much
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Old 28-04-2014, 13:53   #2
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Re: Flanged & Castellated Prop Nut (A Myth?)

"I find castle nut, I find flanged hexes, but no castellated flanged hexes to fit a 1" prop shaft."

Easy enough to cut castellations in a flanged hex with a round file though.
Or use a castellated nut with a separate washer.
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Old 28-04-2014, 13:59   #3
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Re: Flanged & Castellated Prop Nut (A Myth?)

Brass is the wrong material for that application.
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Old 28-04-2014, 17:59   #4
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Re: Flanged & Castellated Prop Nut (A Myth?)

Doesn't take much strength, nut only has pressure on it in reverse, My 25 HP Mariner's prop nut is plastic
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Old 28-04-2014, 20:24   #5
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Re: Flanged & Castellated Prop Nut (A Myth?)

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Brass is the wrong material for that application.
It might be silicon bronze. What material is the propeller shaft?
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Old 28-04-2014, 21:02   #6
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Re: Flanged & Castellated Prop Nut (A Myth?)

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Doesn't take much strength, nut only has pressure on it in reverse, My 25 HP Mariner's prop nut is plastic
Once the taper has seated, a nut is not needed, Forward or reverse.
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Old 28-04-2014, 21:06   #7
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Re: Flanged & Castellated Prop Nut (A Myth?)

Yep, that's why they fit those nuts, not needed, just an exercise in wasting $$$, after all, what do they know compared to us experts.
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Old 28-04-2014, 21:13   #8
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Re: Flanged & Castellated Prop Nut (A Myth?)

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Yep, that's why they fit those nuts, not needed, just an exercise in wasting $$$, after all, what do they know compared to us experts.
Nope, the nut is for you
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Old 29-04-2014, 08:06   #9
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Re: Flanged & Castellated Prop Nut (A Myth?)

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It might be silicon bronze. What material is the propeller shaft?
Yes, thanks W.winds & mcm, bronze was the one (I knew it was one of those br...s for boat hardware ), shaft is stainless. Nut's about 1 11/32"H & 1 3/4"d at the base (Jefferson for scale).

I may just cut all castellations level w/ the lowest one & re-use the piece. Not sure the cleanest method though, to keep threads true. Torch, saw?
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Old 29-04-2014, 08:33   #10
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Re: Flanged & Castellated Prop Nut (A Myth?)

I don't see what's gained by trimming the castellations to the same length.

Why not just use it as it is?
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Old 29-04-2014, 08:55   #11
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Re: Flanged & Castellated Prop Nut (A Myth?)

Can't just a washer and a nut instead of a flanged nut?
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Old 29-04-2014, 15:28   #12
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Re: Flanged & Castellated Prop Nut (A Myth?)

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I don't see what's gained by trimming the castellations to the same length.

Why not just use it as it is?

An even better idea! Thanks! Cutting it down just served the OCD part of me.

I'm a sucker for keepin as much original hardware as possible, or else I'd just replace it w/ the castle nut & washer combo.

Thanks again
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