00:00:00
welcome back to the shop I'm Jeff from
00:00:01
today's Craftsman and today we're
00:00:04
looking at a pretty cool Fastener this
00:00:07
is what's called a confirmat screw and
00:00:10
some of you may have never seen this
00:00:12
some of you may have seen this in flat
00:00:14
pack Furniture John just came came over
00:00:17
and he wasn't familiar with it so I mean
00:00:20
I think that says a lot uh but this is a
00:00:22
screw that is specifically made for
00:00:25
joining melamine together we have a
00:00:27
cabinet behind us here and we actually
00:00:29
used it in plywood so the advantage of
00:00:32
this screw is you can see it's almost
00:00:34
like the combination of a screw and a
00:00:36
dow so you have the strength of this
00:00:38
really thick um shank it's a 5mm shank
00:00:42
and you have the holding power of these
00:00:45
big threads we have a couple pieces of
00:00:47
melamine here so as I said before this
00:00:50
um this
00:00:52
screw I I not sure if it was designed
00:00:55
specifically for melamine but this is
00:00:57
the best screw for joining pieces of
00:01:00
melamine um so you can see sort of how
00:01:02
it would go here in a butt joint and you
00:01:04
may associate this with sort of Cheaper
00:01:07
cheaper Furniture if you've ever put
00:01:08
together Ikea or something like that you
00:01:11
may have seen screws like this usually
00:01:13
they're a little bit um thinner that may
00:01:16
be because most of this flat pack
00:01:18
Furniture is is using like a 5 a
00:01:20
material and not 3/4 um so this is a 50
00:01:23
mm so roughly 2 in
00:01:26
long uh the shank is 5 mm the threads
00:01:30
here are I want to say 6.8 mm and this
00:01:34
top portion is seven so you need
00:01:37
multiple sizes of holes as well as a
00:01:39
counter sync to get the head in there so
00:01:42
in order to join these together we
00:01:44
use this bit so this bit is actually
00:01:47
made by make it snappy and it's made
00:01:49
specifically for confirmat screws so you
00:01:52
can see we have our counter sink at the
00:01:54
top we have our 7 mm portion there and
00:01:58
we have a 5mm drill bit now these can
00:02:01
also be drilled on a CNC or on a diing
00:02:04
machine with two different bits but when
00:02:07
we're not using that machine we do it by
00:02:09
hand here so let's put a couple screws
00:02:11
in this and we'll show you the strength
00:02:14
of of this kind of screw we have a clamp
00:02:16
on our two pieces here if we were using
00:02:18
our diing machine all these holes would
00:02:20
already be aligned just by using the
00:02:21
machine but if you're doing this in your
00:02:23
shop you can use some biscuits for
00:02:25
alignment um in conjunction with a clamp
00:02:27
to hold everything nice and steady
00:02:29
that's what we're doing here so I'm just
00:02:32
going to eyeball this let me see get
00:02:34
this out of the way so you see we have a
00:02:38
nice Brad Point bit
00:02:43
here and this with this bit you really
00:02:45
want to clear the chips so I'll back
00:02:54
out and let's throw one on the other
00:02:57
side as well
00:03:04
and these you see use a posy drive so if
00:03:07
you didn't know when you see a little X
00:03:08
on the head of the screw like this that
00:03:10
denotes posy drive and this is a number
00:03:13
three so I have a number three posy
00:03:15
drive here in my
00:03:17
drill can run these in
00:03:40
you can see they have a big head so you
00:03:42
get a lot of surface area and they act
00:03:45
as a as a clamp um because you have all
00:03:48
of that surface to really pull in and
00:03:51
that nice shoulder with the 7 mm
00:03:56
hole should we try and break this in
00:03:58
half go for it
00:04:01
so like I was saying these are are like
00:04:04
Dows so you know we have an inch and a
00:04:06
quarter of this sticking into here and I
00:04:09
don't want to hurt
00:04:14
myself this is a it's a baby
00:04:18
Mallet this one's a little
00:04:26
bigger so that took a lot of Force to
00:04:30
break more Force than you're ever going
00:04:32
to be applying to the corner of a
00:04:34
cabinet and you can imagine if this
00:04:36
thing was a square so we're dealing with
00:04:38
just one corner and we don't have the
00:04:41
other Corners you know sort of holding
00:04:42
everything together as well as a back so
00:04:45
very very strong connection and you can
00:04:48
see this side is is pretty much
00:04:50
unaffected we have a little bit of
00:04:52
cracking here but um so let's see how
00:04:56
these work in plywood sort of an
00:04:58
offbrand you we're over here at this
00:05:00
cabinet you can see our confirmat screws
00:05:03
here that John noticed when he came in
00:05:06
and we wanted to try these out on this
00:05:07
cabinet as a test just to see how these
00:05:10
acted in plywood is it stronger than
00:05:12
regular screws and um we think we have a
00:05:15
pretty strong cabinet so let's head over
00:05:17
to the bench here and see how it works
00:05:19
in plywood have two pairs of uh plywood
00:05:22
mockups here set up these are the exact
00:05:24
same size we'll do one in the confirmat
00:05:27
and one in our normal 2-in by8 or 8x2
00:05:31
wood screw and we'll test them head
00:05:33
to-head see how they how they
00:05:36
[Music]
00:05:47
Faire I'm honestly not
00:05:50
sure what's going to happen
00:05:53
but uh let's do the wood screw
00:05:58
first so again this is two number 8 by 2
00:06:01
in uh construction
00:06:07
screws see how much that just loosened
00:06:14
up I think we actually just broke the
00:06:16
screws
00:06:20
off
00:06:22
wow that's uh not what I
00:06:26
expected so that was like three good
00:06:28
shots
00:06:29
and we broke that
00:06:36
one so this one loosened up a lot again
00:06:44
too I don't know if that one
00:06:55
counts still hanging on by a thread
00:07:00
could probably repair that with a little
00:07:01
wood putty maybe yeah epoxy Gap
00:07:06
filling uh you see we split this veneer
00:07:10
all the way down like 6 in into the
00:07:15
board we got a little bending here on
00:07:18
these but no breakage so that's sort of
00:07:22
you know why we equate these to a dow
00:07:25
because they have all of that Shear
00:07:27
strength where they won't break I'm
00:07:29
actually I'm really shocked that these U
00:07:31
snapped that
00:07:33
easily um you know I know screws don't
00:07:36
have the most strength in that
00:07:37
application but what a difference so it
00:07:40
doesn't seem to hold quite as well in
00:07:43
plywood as it does in melamine you know
00:07:45
a little splitting seems to occur but
00:07:49
definitely looks stronger than a regular
00:07:51
wood screw to me great in melamine I
00:07:54
don't know you tell me confirmat screw
00:07:57
try it on your next project I think it's
00:07:59
worth a
00:08:01
shot grab a pack and try them out if you
00:08:04
have any questions about these leave
00:08:05
them down below we'll see you next week
