I have a situation where I needed a 5/16" recessed nut threaded knob.
However, at the local hardware, only a knob with a 3/8" recessed nut was
available. Since I didn't have time to order and wait, I am trying one
of two things and I would appreciate any commentary. I bought some
plain, hex 5/16" nuts. Since the recessed nut in the knob actually has
part of its metal surface at the same level as the knob, I decided to
place a drop of threadlocker on there, carefully drop the 5/16" nut onto
that area, and then compress both pieces together as tightly as I could
with a clamp. After I first did this a few hours ago, I let the clamp
in place for about 20 mins, then removed it. At first, I thought the
bonded nut was going to hold, but as soon as I applied enough pressure
with my hand, it came off. Since there's no threads actually grabbing
and this is essentially a nut up against a nut (but compressed with a
clamp), I don't know if this is going to ever bond well with the
threadlocker.

The other option I'm considering is to simply drill out the reverse side
of the knob a bit, drop the 5/16" nut in there, and glue in place with
something like two part JB Weld.

There's going to be a lot of pressure on the knob as it is turned to
hold something in place, so not sure which option above would be best.
No time to order and wait for the 5/16" knobs.

Thanks for your help.

JBL

On Saturday, April 29, 2017 at 4:14:14 PM UTC-4, JBL wrote:
I have a situation where I needed a 5/16" recessed nut threaded knob.
However, at the local hardware, only a knob with a 3/8" recessed nut was
available. Since I didn't have time to order and wait, I am trying one
of two things and I would appreciate any commentary. I bought some
plain, hex 5/16" nuts. Since the recessed nut in the knob actually has
part of its metal surface at the same level as the knob, I decided to
place a drop of threadlocker on there, carefully drop the 5/16" nut onto
that area, and then compress both pieces together as tightly as I could
with a clamp. After I first did this a few hours ago, I let the clamp
in place for about 20 mins, then removed it. At first, I thought the
bonded nut was going to hold, but as soon as I applied enough pressure
with my hand, it came off. Since there's no threads actually grabbing
and this is essentially a nut up against a nut (but compressed with a
clamp), I don't know if this is going to ever bond well with the
threadlocker.

The other option I'm considering is to simply drill out the reverse side
of the knob a bit, drop the 5/16" nut in there, and glue in place with
something like two part JB Weld.

There's going to be a lot of pressure on the knob as it is turned to
hold something in place, so not sure which option above would be best.
No time to order and wait for the 5/16" knobs.

Thanks for your help.

JBL

I would use JB Weld or similar epoxy. Threadlocker is not designed
to bond things together. It might work in some cases and have some
strength, but I think the other choices have a much better chance of
holding.

On 04/29/2017 04:30 PM, trader_4 wrote:
On Saturday, April 29, 2017 at 4:14:14 PM UTC-4, JBL wrote:
I have a situation where I needed a 5/16" recessed nut threaded knob.
However, at the local hardware, only a knob with a 3/8" recessed nut was
available. Since I didn't have time to order and wait, I am trying one
of two things and I would appreciate any commentary. I bought some
plain, hex 5/16" nuts. Since the recessed nut in the knob actually has
part of its metal surface at the same level as the knob, I decided to
place a drop of threadlocker on there, carefully drop the 5/16" nut onto
that area, and then compress both pieces together as tightly as I could
with a clamp. After I first did this a few hours ago, I let the clamp
in place for about 20 mins, then removed it. At first, I thought the
bonded nut was going to hold, but as soon as I applied enough pressure
with my hand, it came off. Since there's no threads actually grabbing
and this is essentially a nut up against a nut (but compressed with a
clamp), I don't know if this is going to ever bond well with the
threadlocker.

The other option I'm considering is to simply drill out the reverse side
of the knob a bit, drop the 5/16" nut in there, and glue in place with
something like two part JB Weld.

There's going to be a lot of pressure on the knob as it is turned to
hold something in place, so not sure which option above would be best.
No time to order and wait for the 5/16" knobs.

Thanks for your help.

JBL

I would use JB Weld or similar epoxy. Threadlocker is not designed
to bond things together. It might work in some cases and have some
strength, but I think the other choices have a much better chance of
holding.


That's exactly what I just did, use the JB Weld. Even after hours of
compression of the nuts together, they still come apart fairly easily
using threadlocker. Funny how that stuff seems to only work on threads.
I can thread something with it, and it's tight as it ever will be in 5
minutes.

On Sat, 29 Apr 2017 16:14:10 -0400, JBL wrote:

I have a situation where I needed a 5/16" recessed nut threaded knob.
However, at the local hardware, only a knob with a 3/8" recessed nut was
available. Since I didn't have time to order and wait, I am trying one
of two things and I would appreciate any commentary. I bought some
plain, hex 5/16" nuts. Since the recessed nut in the knob actually has
part of its metal surface at the same level as the knob, I decided to
place a drop of threadlocker on there, carefully drop the 5/16" nut onto
that area, and then compress both pieces together as tightly as I could
with a clamp. After I first did this a few hours ago, I let the clamp
in place for about 20 mins, then removed it. At first, I thought the
bonded nut was going to hold, but as soon as I applied enough pressure
with my hand, it came off. Since there's no threads actually grabbing
and this is essentially a nut up against a nut (but compressed with a
clamp), I don't know if this is going to ever bond well with the
threadlocker.

The other option I'm considering is to simply drill out the reverse side
of the knob a bit, drop the 5/16" nut in there, and glue in place with
something like two part JB Weld.

There's going to be a lot of pressure on the knob as it is turned to
hold something in place, so not sure which option above would be best.
No time to order and wait for the 5/16" knobs.

Thanks for your help.

JBL

Either change the male threaded component to 3/8" thread or order the correct knob for the job. Don't
afro-engineer the damn thing.

https://www.mcmaster.com/#3992t26/=17evxuf