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Threaded inserts in plywood

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Forum topic by dfox52 posted 05-30-2020 03:10 PM 301 views 0 times favorited 10 replies Add to Favorites Watch
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dfox52

43 posts in 2470 days


05-30-2020 03:10 PM

Threaded inserts, like many fasteners, come in hardwood and softwood versions. Typically, this means a finer thread and a smaller mounting hole. With that in mind, is plywood considered softwood or hard wood? My thinking is that plywood is less dense than say maple or cherry and so the softwood inserts would be more appropriate. Thoughts?


10 replies so far

View ibewjon's profile

ibewjon

1651 posts in 3569 days


#1 posted 05-30-2020 03:16 PM

Pine core, softwood inserts. Baltic birch, I would do a test.

View GR8HUNTER's profile

GR8HUNTER

7575 posts in 1489 days


#2 posted 05-30-2020 03:20 PM

if i had to do it i would epoxy them in for better strenghth :<)))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN

View John Smith's profile

John Smith

2440 posts in 939 days


#3 posted 05-30-2020 03:59 PM

you didn’t mention how thick the plywood is.
is this just a general question or do you actually have a need for it.

if I needed one in plywood, I would prefer T-Nuts. they come in a
wide variety of styles and sizes. if that were not an option, I would cruise the net
to try to find something that would be appropriate for the project and saturate
the hole first with epoxy, then just before the epoxy hardens, install the brass insert.

.

-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

View dfox52's profile

dfox52

43 posts in 2470 days


#4 posted 05-30-2020 04:30 PM



you didn t mention how thick the plywood is.
is this just a general question or do you actually have a need for it.

if I needed one in plywood, I would prefer T-Nuts. they come in a
wide variety of styles and sizes. if that were not an option, I would cruise the net
to try to find something that would be appropriate for the project and saturate
the hole first with epoxy, then just before the epoxy hardens, install the brass insert.

.

- John Smith


A general question. Not looking for a solution. I am using flush mount threaded inserts in plywood.

View dfox52's profile

dfox52

43 posts in 2470 days


#5 posted 05-30-2020 04:30 PM



if i had to do it i would epoxy them in for better strenghth :<)))

- GR8HUNTER

Very good point!

View dfox52's profile

dfox52

43 posts in 2470 days


#6 posted 05-30-2020 04:33 PM



Pine core, softwood inserts. Baltic birch, I would do a test.

- ibewjon

Thanks… I just found the E-Z LOK web site and they list plywood as softwood. I will do a test though :)

View therealSteveN's profile

therealSteveN

5773 posts in 1350 days


#7 posted 05-30-2020 05:09 PM

I’m with John, on plywood T nutz, are my go to. I would only use a threaded insert in HARD, hardwood. I’ve seen them be iffy in the softer hardwoods, unfortunately many of them are Domestics. Chestnut, Cherry, Walnut.

-- Think safe, be safe

View dfox52's profile

dfox52

43 posts in 2470 days


#8 posted 05-30-2020 07:12 PM



I m with John, on plywood T nutz, are my go to. I would only use a threaded insert in HARD, hardwood. I ve seen them be iffy in the softer hardwoods, unfortunately many of them are Domestics. Chestnut, Cherry, Walnut.

- therealSteveN

Thanks but these will not work for my application.

View dfox52's profile

dfox52

43 posts in 2470 days


#9 posted 05-30-2020 08:35 PM

Thanks for the input folks!! I apologize though, I’m forgetting my manners. It just dawned on me that it’s common courtesy to fill people in a little about the project at hand. What I’m doing is making an “executive style” desk with 3 drawer file cabinet type ends on each side. The top, face frame, and drawer fronts are all solid cherry. The cabinet carcasses however, are 3/4” plywood. The whole thing will be heavy and bulky so I want to be able to knock it apart in case it needs to be moved. So what I did was place the top upside down on my bench, then arrange the two file cabinet ends in position. I cut four twelve inch lengths of 1 1/2” aluminum, SLOTTED angle bracket to fit the front and back INSIDE the carcasses. Here’s where the threaded inserts come in. I used four 1/4-20 inserts, front and back, along the angle bracket in both the plywood carcass and along the underside of the desktop. So now I can disassemble the whole thing and use the angle brackets as location finders for the top when reassembled. The inserts went in nice and snug so I think they will hold well. Not designed to be a portable system, I just wanted to be able to take it apart if ever needed. Thanks again for the great suggestions!

View John Smith's profile

John Smith

2440 posts in 939 days


#10 posted 05-30-2020 09:24 PM

I’m forgetting my manners. It just dawned on me that it’s common courtesy
to fill people in a little about the project at hand.

- dfox52

this is the most common problem with most forums – sometimes it is like pulling teeth
just to get a basic understanding for the original question.
(and on this forum, some of the most senior members here are the worst with providing
minimal information for a complex project).

looking forward to seeing your finished project – sounds very interesting.

.

-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

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