Tapping threads into maple - reinforce with epoxy?

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Forum topic by Timer posted 04-20-2015 12:26 AM 1804 views 0 times favorited 8 replies Add to Favorites Watch
View Timer's profile


5 posts in 3799 days

04-20-2015 12:26 AM

So I’ve been experimenting with large hand taps a bit and was wondering about an experiment I’d like to try. I drilled an admittedly ragged hole into a piece of maple, and then tapped it with a set of 1 1/4”-9 thread taps. The threads hold the large bolt, but it’s way sloppy. I was thinking about painting epoxy on the walls of the maple, a release agent on the bolt, and then threading it together. Once the epoxy has cured, I can pop the bolt free (due to the release agent) and then back the bolt out, leaving full, strong epoxy/wood threads. I’m wondering about the best release agent. Wax? Heavy oil? Crisco?

8 replies so far

View gsuing's profile


47 posts in 3377 days

#1 posted 04-20-2015 12:45 AM

Nope, maple is plenty strong to hold the bolt without epoxy. I’ve done it several times.

View johnstoneb's profile


3220 posts in 3627 days

#2 posted 04-20-2015 01:42 AM

Just paint the wood with epoxy run the bolt in and back out that will distribute the epoxy. You can use denatured alcohol to clean the bolt threads. Once the epoxy has cured you can run the bolt in if you need to you can clean the threads with the tap.

-- Bruce, Boise, ID

View Redoak49's profile


5581 posts in 3443 days

#3 posted 04-20-2015 01:50 AM

Coat the threads with super glue. It will strengthen them a n make them swell a little.

View TheFridge's profile


10863 posts in 2941 days

#4 posted 04-20-2015 02:00 AM

Or wait till the epoxy hardens and re tap it?

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View bondogaposis's profile


6183 posts in 3806 days

#5 posted 04-20-2015 02:03 AM

Or wait till the epoxy hardens and re tap it?

- TheFridge

That’s the way I’d do it too.

-- Bondo Gaposis

View Bluepine38's profile


3393 posts in 4540 days

#6 posted 04-20-2015 03:49 PM

One other method is to use a taper tap and not run the tap all the way out the other side. This will
let the bolt cut it own threads in the last section and insure la snug fit. If you need a real strong and
tight reusable thread-the bolt will be taken out and reinstalled repeatedly-then the epoxy is a good idea,
or something like this:
Threaded Inserts | E-Z LOK
for real strong threads.

-- As ever, Gus-the 83 yr young apprentice carpenter

View MrRon's profile


6314 posts in 4698 days

#7 posted 04-20-2015 06:42 PM

JB Weld, drill and tap.

View benchbuilder's profile


285 posts in 3905 days

#8 posted 04-20-2015 08:17 PM

How about drilling out the threads and plug the hole with a round maple dowel and redrill for a better hole and tighter fitting threads.

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