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Old 29th October 2008, 12:36 PM   #1
mhtplsh is offline mhtplsh  India
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Default insert t nuts

When making big subwoofer cabinets t nuts & insert nuts r used.
HI hv attached the picture of the 3 different type of inserts used in box making.
Which is better among this?
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File Type: jpg insert tnut.jpg (96.7 KB, 469 views)
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Old 29th October 2008, 12:46 PM   #2
AndrewT is offline AndrewT  Scotland
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I would expect all of these to work adequately.
The two with the 4tang arrangement may need pilot holes if the board is particularly hard. Some grades of MDF (HDF?) seem to always bend the tangs.

All of them are inserted from the back and very effectively clamp the board between Tnut and driver frame.
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Old 29th October 2008, 01:07 PM   #3
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You might check out the PartsExpress site, they have the "T" nuts with an extra tang for additional grab.

Pete
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Old 29th October 2008, 01:32 PM   #4
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Default Re: insert t nuts

Quote:
Originally posted by mhtplsh
When making big subwoofer cabinets t nuts & insert nuts r used.
HI hv attached the picture of the 3 different type of inserts used in box making.
Which is better among this?

Could you get these T nuts in India.
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Old 29th October 2008, 02:23 PM   #5
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Default Re: insert t nuts

Quote:
Originally posted by mhtplsh
When making big subwoofer cabinets t nuts & insert nuts r used.
HI hv attached the picture of the 3 different type of inserts used in box making.
Which is better among this?

All three could work, but as said the tangs can bend over. The kind in the middle is my preferred type, but I augment the holding power by putting a drop of epoxy in the hole before press fitting the insert nut.

I don't like the screw in kind (not shown) because they never go in orthogonal to the work piece without setting up a jig and using the drill press to screw them in. Which...is annoying.

-Scott
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Old 29th October 2008, 03:00 PM   #6
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I use the screw in type and while it's difficult to get them square if you screw from the back after the cabinet is built, I had no problem just putting them in by hand with an allen key to the panel before it was glued to the box. This was with MDF, it's probably harder with plywood.
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Old 29th October 2008, 03:04 PM   #7
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Default Re: Re: insert t nuts

Quote:
Originally posted by SpeakerScott



All three could work, but as said the tangs can bend over. The kind in the middle is my preferred type, but I augment the holding power by putting a drop of epoxy in the hole before press fitting the insert nut.
We use the ones in the middle -- "thickified" epoxy or cyano-acrylate adhesive with poly fibers in it works extremely well. The CA can cure almost instantly.
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Old 29th October 2008, 05:45 PM   #8
AMV8 is offline AMV8  United Kingdom
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Hi

I would expect them all to work.

However in practice I use a nut with a plastic insert and glue that to the cabinet. If I can not use that I use a very small amount of car gasket compound and add it to the bolt thread to stop the nuts working loose with use.

Don
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Old 29th October 2008, 09:05 PM   #9
mikela is offline mikela  United States
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Hi mhtplsh,

Here is an approach that I used http://www.htguide.com/forum/showthread.php4?t=29922 . You can see the end results for me and some additional commentary here http://www.htguide.com/forum/showthread.php4?t=29968 .

HTH
Mike
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Old 29th October 2008, 09:48 PM   #10
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The one in the is not actually a t-nut, it is called a threaded insert. These are more reliable than a t-nut. I'll only use a t-nut in an application where i can get at both sides without removing the device it is holding (only 1 experience with having to find a way to remove a driver after the t-nut spins loose was convincement enuff)

When installing these i use 1 or more sacrificial bolts & some washers to slowly pull the t-nut or threaded insert into position. This ensures a square fit and a more secure installation.

dave
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