Machine thread with nut or not ? - SailNet Community
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post #1 of 25 Old 01-05-2009 Thread Starter
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Machine thread with nut or not ?

My cleats are secured to the deck with machine screw. There's an SS plate embedded in the fibreglass with threads for the screw. I'm thinking of putting a nut to the screw to secure the cleat better. Should I just screw in the nut or drill away the thread on the SS plate and tighten cleat using the nut ?

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2002 Hunter 326, SV Millennium 2
1999 Macgregor 26X, SV Millennium
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post #2 of 25 Old 01-05-2009
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Leave the threads in the plate. Tighten the bolt and then add the nut to the bottom.

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post #3 of 25 Old 01-05-2009
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Quote:
Originally Posted by AllThumbs View Post
Leave the threads in the plate. Tighten the bolt and then add the nut to the bottom.
Yep... I'd probably add a flat washer and a lock washer as well

David

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post #4 of 25 Old 01-05-2009
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trantor
I was confused at first...did you mean bolt, not screw? A screw won't take a nut on the end. I think you meant bolt
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post #5 of 25 Old 01-05-2009
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xort: Machine screws will take a nut.

I'd skip the lock washer and use Loctite instead. (And from the top, to protect the threading into the plate, as well.) Keeps weight off the boat, and protects the threads from moisture intrusion and corrosion, too.
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post #6 of 25 Old 01-05-2009
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I would definitely go with the "tighten the screw and add a washer, locking washer and nut" brigade. Belt, braces and piece of string approach. Way to go!

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post #7 of 25 Old 01-05-2009
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Quote:
Originally Posted by xort View Post
trantor
I was confused at first...did you mean bolt, not screw? A screw won't take a nut on the end. I think you meant bolt
Xort a machine screw is a bolt with a screw type head on it as opposed to a hex head..

These are examples of machine screws:

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post #8 of 25 Old 01-06-2009 Thread Starter
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Yup, its a 1/4" machine screw, screwing into a threaded SS plate. After sever wake-dance the cleats start "moving" thus needing retightening. I added a nut under just so the screw won't be work loose by wake-dancing but not sure if that is the right way, but it now seems that's the way to go by all your account. Thanks for the info.

Ken
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1999 Macgregor 26X, SV Millennium
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post #9 of 25 Old 01-06-2009
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1/4" machine screw, on a Hunter 326? I'm not sure I'd consider 1/4" screw or bolt, or even a pair of them, large enough to handle the cleats on a boat that size in any kind of chop. Or storm.

Although I suppose upsizing the cleats all around to something that used heavier bolts--and then throughbolting them--would be the usual "not inexpensive!" project.
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post #10 of 25 Old 01-08-2009 Thread Starter
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Yah that crosses my mind too. There're 4 screws per cleats.

Ken
2002 Hunter 326, SV Millennium 2
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