How to attach Prop Nut Zinc? - SailNet Community

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Old 05-12-2010
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How to attach Prop Nut Zinc?

I'd like to use a zinc at the prop nut, but I'm not sure how they are attached. It looks like the zinc is attached to a special nut using a set screw, but does the special nut replace one of the propeller nuts? What about the cotter pin? Is the pin eliminated?
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i would be very suspect of no cotter pin. i believe you would add the nut for the zinc on tail of shaft after your lock nut. that way if you lost the zinc your prop securing system is still intact. my question is this an inboard propulsion system you are talking about, because that is what i am referring to. if this an out board question then your zinc is your little fin above prop. there is a bolt that holds it in place and you can adjust the angle of the fin to minimize prop walk
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Old 05-12-2010
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Why do you think you need a prop zinc? I have one on my prop but then its a feathering prop designed to have a zinc, most fixed props I know of or have seen don't use a prop zinc, they use shaft zincs??? I use both by design...Confused
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Yes, inboard.

Why prop zinc? I don't have the room between prop hub and cutlass bearing for a shaft zinc.
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Could you post a picture? When the zinc goes, whats going to happen to the prop? UM
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The prop zinc is designed to go on props that have a conical type lock nut with a hole in the center where the bolt goes. The cotter pin stays in place to do its job! The prop zinc does not replace the cotter pin!

The zinc goes on the back and over the prop nut and is tightened by the set bolt. There is a digit stamped on the prop nut that reads the series such as A, B, C, D etc. You will need to check that to get the correct prop zinc. The correct prop zinc will fit properly and needs to be tightened to be snug fit. Don't over-tighten it so much to break or deform the lock nut!

Hope that helps.
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Old 05-15-2010
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Quote:
Originally Posted by preservedkillick View Post
I'd like to use a zinc at the prop nut, but I'm not sure how they are attached. It looks like the zinc is attached to a special nut using a set screw, but does the special nut replace one of the propeller nuts?
Yes, the new conical nut will replace both existing nuts.

Quote:
Originally Posted by preservedkillick View Post
What about the cotter pin? Is the pin eliminated?
No. The new, conical nut is slotted, allowing the cotter pin to be reinstalled once the nut is in place. Then the zinc goes on. Here's a tip. Replace the machine screw that comes with the zinc/nut set with a similarly sized hex head bolt. Put two stainless lock washers on the bolt to raise the bolt head above the recess in the end of the zinc. Now you can crank that baby on with a wrench or socket. Much better and more secure than doing it with a screwdriver.




Prop nuts are sized thusly:

A = 3/4" shaft diameter
B = 7/8" shaft diameter
C = 1" & 1 1/8" shaft diameter
D = 1 1/4" shaft diameter
E = 1 3/8" shaft diameter
etc., etc., etc.
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