Forums > Windsurfing General

Loctite n Screws

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Created by olskool Saturday, 16 Mar 2019
olskool
QLD, 1115 posts
Saturday , 16 Mar 2019 7:09AM
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Hi Crew,
Ive got an older board i love to ride. But footstrap screw inserts are worn n screws constantly loosen every few sessions. Is it advisable to use LOCTITE to prevent them from loosening?
Cheers Darkman.

WindmanV
VIC, 633 posts
Saturday , 16 Mar 2019 8:47AM
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Hello, Olskool,

Loctite will not work on the plastic/nylon inserts. Suggest you go to a specialist bolt bar and get the same length screws as current, but the next width up in size.

Also, these screws need to be especially suitable for use in plastics (sorry, I've forgotten their technical name but someone else might know it and advise) . Do not use self-tappers.

Hope this helps.

fjdoug
ACT, 431 posts
Saturday , 16 Mar 2019 8:58AM
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i use an RTV adhesive on plastic inserts similar to this ;

www.permatex.com/products/adhesives-sealants/sealants/permatex-clear-rtv-silicone-adhesive-sealant/

WindmanV
VIC, 633 posts
Saturday , 16 Mar 2019 9:00AM
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Back again,

The following might help: "Screws for plastics have a thread that is designed to be used in soft materials. It generally has a 30 degree flank angle thread that slices through plastic materials without inducing high stress levels and offers high pull out performance".

From memory, I think they are called "PT" screws and they need to be of stainless steel material.

Hardcarve1
QLD, 412 posts
Saturday , 16 Mar 2019 8:10AM
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Just use cyanoacrylate or super glue with a drop placed on the screw just before tightening up. Old trick from my RC helicopter days and nothing came loose. If its a real sloppy screw fit then try new screws which will stop you having that perfect session cut short which you know will happen.

olskool
QLD, 1115 posts
Saturday , 16 Mar 2019 8:20AM
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Hardcarve1, so if i use superglue. Can it be undone if necessary?

LeeD
388 posts
Saturday , 16 Mar 2019 8:44AM
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Why not use star friction washers?

Hardcarve1
QLD, 412 posts
Saturday , 16 Mar 2019 11:29AM
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Select to expand quote
olskool said..
Hardcarve1, so if i use superglue. Can it be undone if necessary?


Yup, the glue just forms a plastic film that flakes off when you undo the screw. You will feel the screw crack the bond when undoing them.
I actually use Cyano on any metal to plastic thread use out of habit. Don't worry it wont bond so tight that you cannot undo them.

olskool
QLD, 1115 posts
Saturday , 16 Mar 2019 11:42AM
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^^ Ok thanks mate. Will give it a Razz.

Mark _australia
WA, 18816 posts
Saturday , 16 Mar 2019 9:16PM
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Stick a bit of whipper snipper line in each hole and use same screws.

joe windsurf
1446 posts
Saturday , 16 Mar 2019 9:55PM
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^+1 I often put dental floss or plumbing tape to help tighten screws
although i have not tried this with footstrap screws
asked local shop what to do with loosening footstraps
he said tighten the crap out of it
that has worked for me so far ...
(yeah - i know - now i just have to get in em and stay there)

olskool
QLD, 1115 posts
Sunday , 17 Mar 2019 5:12AM
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Select to expand quote
Mark _australia said..
Stick a bit of whipper snipper line in each hole and use same screws.

Sweet! , Mark youre always coming up with cutting edge tweaks. Whats your day job? Hehe...

Manuel7
244 posts
Monday , 18 Mar 2019 8:15AM
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Bigger screws first. If thread is messed up then I've used a plastic wall anchor. I epoxied it inside after roughening up/slicing cuts in it for the epoxy to bind. Then, I use a washer under the strap so that it prevents the anchor from coming out when tightening.

The anchor needs to be a tight fit, I hammered (gently) it in the insert. Anyway, worked well but I don't need to unscrew strap often unless I need to replace torn straps.

Go slow when tightening or unscrewing as heat will soften the anchor.



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"Loctite n Screws" started by olskool