Tapping threads into maple - reinforce with epoxy?

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Forum topic by Timer posted 04-20-2015 12:26 AM 1255 views 0 times favorited 8 replies Add to Favorites Watch
View Timer's profile


5 posts in 2857 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


35 posts in 2435 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


3131 posts in 2685 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


4190 posts in 2501 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


10859 posts in 1998 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


5542 posts in 2864 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


3387 posts in 3598 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 80 yr young apprentice carpenter

View MrRon's profile


5721 posts in 3756 days

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

JB Weld, drill and tap.

View benchbuilder's profile


285 posts in 2963 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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