Prop nut for Merc 25 hp?

[nola mike]

While installing my prop realized too late that the nut was nylon. Looks like the part # is 11-88228. Any reason not to go with a regular brass nylock nut, and does anybody have a part # or size?

 

[Fun Times]

Take note of the notes which includes a size of reference (M12)

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66	4011912	--NUT-Brass (M12)-For SS Propellers		$0.00	1
66	88228	NUT-Nylon (M12)-For Alum Propellers		$2.92	1

 

[nola mike]

Take note of the notes which includes a size of reference (M12)

Genuine Mercury Marine parts, large inventory, fast shipping

Genuine Mercury Marine, Mercruiser and Mercury Racing engines, parts, propellers. Authorized dealer with large inventory, great prices, fast shipping!

www.mercruiserparts.com

66	4011912	--NUT-Brass (M12)-For SS Propellers		$0.00	1
66	88228	NUT-Nylon (M12)-For Alum Propellers		$2.92	1

I wonder why the spec different nuts for different props? Anyway, I don't see a reason not to use the brass nut, if I can find an M12 x ? Nylock.

 

[jimmbo]

Might have something to do with the SS prop having greater mass, and thus more inertia,

 

[Scott Danforth]

Stainless + aluminum + copper alloy (brass) is a recipe for galvanic corrosion.

 

[nola mike]

Stainless + aluminum + copper alloy (brass) is a recipe for galvanic corrosion.

I was thinking that as a reason not to use SS nut with aluminum prop, but brass nuts are commonly used on both, no?

Might have something to do with the SS prop having greater mass, and thus more inertia,

Yes, for why nylon isn't used on stainless... But why not brass on both? Corrosion like Scott said or just to save a buck?

 

[jimmbo]

Lots of SS Props and AL Props use the same Prop Nuts, so who knows....