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Old 05-18-07, 10:49 AM   #1
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Solution for Stripped Threads?

The threads are stripped in one of the bottle cage mount holes on my steel mtb frame. I can get the bolt to screw in, but it won't tighten up. It just spins.

What's the best remedy?

Thanks.
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Old 05-18-07, 10:51 AM   #2
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Quote:
Originally Posted by Peek the Geek
The threads are stripped in one of the bottle cage mount holes on my steel mtb frame. I can get the bolt to screw in, but it won't tighten up. It just spins.

What's the best remedy?

Thanks.
tap it with next biggest size tap and use a larger bolt.
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Old 05-18-07, 11:30 AM   #3
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The bolt could be the problem. Have you tried a new one?
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Old 05-18-07, 11:34 AM   #4
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Yep, I've tried a different bolt. It's definitely the frame.

I'll admit I've never re-tapped anything before. Is it pretty easy? And do they make larger diameter cage mount bolts, or do I just buy something similar at the hardware store?
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Old 05-18-07, 11:39 AM   #5
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using a tap is basically like screwing in a bolt. go nice and slow and use some light oil on the tap. or ask you lbs if they could do it. the bolt will be determined by the tap size.

here is a demo

http://www.diynetwork.com/diy/hi_too...206426,00.html
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.

Last edited by jsharr; 05-18-07 at 11:44 AM.
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Old 05-18-07, 11:47 AM   #6
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Quote:
Originally Posted by jsharr
using a tap is basically like screwing in a bolt. go nice and slow and use some light oil on the tap. or ask you lbs if they could do it. the bolt will be determined by the tap size.

here is a demo

http://www.diynetwork.com/diy/hi_too...206426,00.html
Very helpful. Thank you.
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Old 05-18-07, 12:19 PM   #7
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Tapping a hole is very easy. Just take your time, and don't forget to reverse the tap about a 1/4 turn every 1/2 - 2/3rds rotation to break the chips.
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Old 05-18-07, 12:30 PM   #8
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If it's just the bottle cage, stick a toothpick in the hole and try screwing it in again.
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Old 05-18-07, 12:33 PM   #9
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Quote:
Originally Posted by Air
If it's just the bottle cage, stick a toothpick in the hole and try screwing it in again.
hahah, that's my grandpa's old fix. love it.
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Old 05-18-07, 12:34 PM   #10
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Quote:
Originally Posted by rjacob
Tapping a hole is very easy. Just take your time, and don't forget to reverse the tap about a 1/4 turn every 1/2 - 2/3rds rotation to break the chips.
Single best bit of advice to follow. You may want to go-up a size to fractional size (inchs not metric) Of course you can simply go-up one millimeter for that matter. 3/16 seems about right. Do check it first!
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Old 05-18-07, 03:27 PM   #11
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Just trying the next larger tap size in the hole may EASILY result in a broken tap!
The hole has to be drilled to the proper size (called a tap drill) before tapping.
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Old 05-18-07, 05:27 PM   #12
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Water bottle bolts are M5x.8 mm. The next size up would be M6x1.0 mm. The tap drills and taps for this are readily available
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Old 05-18-07, 08:50 PM   #13
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I had a similar problem on a Raleigh Technium frame and it was the "braze-on" spinning in the frame. It wasn't really brazed on, obviously. Glued it back in place with superglue and didn't have any more problems.
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Old 05-18-07, 09:33 PM   #14
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You could just wear a Camelbak...
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Old 05-19-07, 01:34 AM   #15
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If you aren't fussy, you can drill it with a 7/32" drill and tap it 1/4-20.
I mention this, because that drill size is commonly found in small, fractional "homeowner" type drill sets.
1/4-20 is a common US bolt size.
If you want to stay Metric, a #8 drill and 6mm tap are required.
You might even do both, just to keep them the same.
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Old 05-19-07, 04:42 AM   #16
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Quote:
Originally Posted by Air
If it's just the bottle cage, stick a toothpick in the hole and try screwing it in again.
Why mess with the toothpick? Just duct tape the cage to the frame. Cmon!
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Old 05-19-07, 07:45 AM   #17
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Quote:
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You could just wear a Camelbak...
Actually, I usually do wear a Camelbak. But for quick rides and for races sometimes I like the simpler option of a water bottle. I also like to carry a water bottle on muddy rides so I can rinse things off if necessary.

Thanks to everyone for their help.
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