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Old 21st June 2011, 03:57 AM   #1
GeneZ is offline GeneZ  United States
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Default Stripped screw hole in plastic.

Suggestions, or know-how, please.

I have a stripped hole in a plastic composite speaker cabinet. When working with plastic how to tighten up the hole?


Thanks, Gene
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Old 21st June 2011, 04:02 AM   #2
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Put in a threaded metal insert or a T-nut, available on Ebay or at a good hardware store.
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Old 21st June 2011, 04:16 AM   #3
GeneZ is offline GeneZ  United States
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Quote:
Originally Posted by wrenchone View Post
Put in a threaded metal insert or a T-nut, available on Ebay or at a good hardware store.
Thanks.. but sorry...

This is for a self tapping type screw. Pointed tip. Metal into plastic.
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Old 21st June 2011, 04:23 AM   #4
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Well, it sounds like you're going to have to adapt the hole to some other type screw, if it's stripped out. Self-tapping screws are a dodgy prospect at best, especially with soft materials.
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Old 21st June 2011, 04:24 AM   #5
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Inject it full of epoxy. Cure. Drill a new pilot hole and run the self-tapping screw in. Many people drill pilot holes too small in hopes of getting a better fit. Usually a mistake as the plastic just cracks.
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Old 21st June 2011, 04:41 AM   #6
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Thumbs up Plastic Welding

You could weld it. It's quick and easy, but the tool is a bit pricey for a one off job. Every auto body shop has them. What could they charge for a five min. job ? Best of luck
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Old 21st June 2011, 04:48 AM   #7
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First thing I'd try is a piece of flat toothpick stuck into the stripped hole. Ease the old screw in; you'll only have a bigger problem if you let the plastic crack.
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Old 21st June 2011, 05:19 AM   #8
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Quote:
Originally Posted by GeneZ View Post
Thanks.. but sorry...

This is for a self tapping type screw. Pointed tip. Metal into plastic.
His T-nut or threaded insert idea is a good one. Of course you'd have to abandon the self tapping screw for a machine screw. Alternatively you could fill the hole with Devcon plastic welder and re-drill it the next day and continue to use the self tapper and possibly strip it out again, The machine screw IS better.

G
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Old 28th June 2011, 09:01 PM   #9
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What's wrong with Conrad's idea in post 5? sounds pretty achievable and easy on the execution side to me.

Just remember to put a piece of tape on the inside to prevent it from dripping out the hole.
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Old 29th June 2011, 04:02 AM   #10
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My dad used to fill any plastic holes with a mixture of superglue and bicarb of soda (I think that was the second part, should be easy to look up), it is so strong you can attach a watch strap with it when the pin hole breakes off....and it doesn't eat the plastic like the glue would do on its own.
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