Screws for MDF carcases

General wood working tips, tricks and ideas. Anything that doesn't belong elsewhere can be discussed here.
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nickw
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Screws for MDF carcases

Post by nickw » Wed Nov 16, 2011 2:15 pm

What are the members' recommendations for screws to hold MDF carcases together in conjunction with biscuits?
Nick Webb, Fine Furniture, Cambridge
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karl
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Re: Screws for MDF carcases

Post by karl » Wed Nov 16, 2011 2:25 pm

I use these from Screwfix. In conjunction with a DeWalt countersink/pilot bit.

Image

Cheers

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Re: Screws for MDF carcases

Post by jfc » Wed Nov 16, 2011 3:00 pm

I use 1 1/2 no 7 . Doesnt matter what type . I sometimes use no 6 aswell . I find no 8 are just a bit to big .

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Re: Screws for MDF carcases

Post by jasonb » Wed Nov 16, 2011 5:57 pm

I use the screwfix carcase screws as well, 3mm pilot hole.

J

jake
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Re: Screws for MDF carcases

Post by jake » Wed Nov 16, 2011 6:41 pm

Spax MDF screws, no pilot.

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Re: Screws for MDF carcases

Post by mattty » Wed Nov 16, 2011 7:02 pm

jake wrote:Spax MDF screws, no pilot.
No splitage?
Cheers, Matt.

mark270981
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Re: Screws for MDF carcases

Post by mark270981 » Wed Nov 16, 2011 8:19 pm

jake wrote:Spax MDF screws, no pilot.
Into end grain? Surely not!
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Re: Screws for MDF carcases

Post by mailee » Wed Nov 16, 2011 8:47 pm

I use the same ones as Karl, and pilot hole them first. :D

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Re: Screws for MDF carcases

Post by jake » Wed Nov 16, 2011 8:59 pm

mark270981 wrote:
jake wrote:Spax MDF screws, no pilot.
Into end grain? Surely not!
Yes. They have a wicked drill point on them, a bit slow to start but no splitting at least on 18mm mdf (not tried them on thinner). Give me a few minutes and I'll post some picture proof.

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Re: Screws for MDF carcases

Post by jake » Wed Nov 16, 2011 9:12 pm

A test on an off-cut (18mm veneered MDF)

Image

I tried one right on the end and on a rebated thinner bit, and that did split, but that is pretty extreme so I'm not surprised.

Image

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Re: Screws for MDF carcases

Post by lynx » Wed Nov 16, 2011 10:14 pm

2" x 6's, best screw ever for 18/19mm panel work
LyNx

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Re: Screws for MDF carcases

Post by mark270981 » Wed Nov 16, 2011 10:18 pm

Jake

That's quite impressive I must have look at those.

Cheers for taking your time with the pictures much appreciated
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Re: Screws for MDF carcases

Post by karl » Wed Nov 16, 2011 10:20 pm

Thanks for posting that Jake - interesting.

Cheers

Karl

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Re: Screws for MDF carcases

Post by jake » Wed Nov 16, 2011 10:27 pm

\This shows the spearhead drill point:

Image

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Re: Screws for MDF carcases

Post by jonnyd » Wed Nov 16, 2011 10:34 pm

thanks for the pics jake but there was really no need to screw a piece of mdf to the table and ruin that groovy table cloth

cheers

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Re: Screws for MDF carcases

Post by mark270981 » Wed Nov 16, 2011 10:36 pm

jonnyd wrote:thanks for the pics jake but there was really no need to screw a piece of mdf to the table and ruin that groovy table cloth

cheers

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Re: Screws for MDF carcases

Post by jake » Wed Nov 16, 2011 10:37 pm

tbh I don't like it much, but what I didn't mean to mess up is the table-top underneath it. oops.

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Re: Screws for MDF carcases

Post by jfc » Thu Nov 17, 2011 11:52 am

:lol: I can imagine the conversation in the morning over breakfast

Mrs Jake ; why is there a lump of wood screwed to the kitchen table ?
Jake ; The boys on the internet didnt beleave i could put a screw in a bit of wood without splitting it so i showed em good . :lol:

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Re: Screws for MDF carcases

Post by nickw » Thu Nov 17, 2011 1:18 pm

Thnkas everyone. I have ordered some of those Spax screws.

From Rutlands - maybe that was a mistake. :lol:
Nick Webb, Fine Furniture, Cambridge
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Re: Screws for MDF carcases

Post by promhandicam » Thu Nov 17, 2011 7:57 pm

nickw wrote:Thnkas everyone. I have ordered some of those Spax screws.

From Rutlands - maybe that was a mistake. :lol:
It was - they are almost twice as expensive as ironmongery direct ;)

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Re: Screws for MDF carcases

Post by jfc » Fri Nov 18, 2011 7:32 am

Ive just ordered two boxes of screws from wurth and they where super cheap . Un branded but the rep hinted that wurth own ressier so they are pretty much ressier screws . They look like em and the screw in like em .
I will send a couple to Jake to do the kitchen table test with :lol:

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Re: Screws for MDF carcases

Post by Tim Nott » Fri Nov 18, 2011 3:52 pm

Spax MDF screws here too 40mm x 4mm on 19m MDF - no no pilot, no splitting as long as you don't go too near (50mm?) the corners. And very strong

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Re: Screws for MDF carcases

Post by nickw » Sat Nov 19, 2011 12:20 pm

Well I my have paid a bit over the top for them, but those Spaxes are the dogs danglies. Due to a misplaced marking out :oops: I have even put some within 10mm of the end of a board with no splitting. The heads look a little small but they seem to hold well nonetheless.
Nick Webb, Fine Furniture, Cambridge
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety.
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Re: Screws for MDF carcases

Post by jake » Sat Nov 19, 2011 4:35 pm

They are worth the extra I think (even maybe the Rutlands extra!)

The heads are on the small and steep side so they don't blow the MDF while countersinking themselves, is my guess.

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Re: Screws for MDF carcases

Post by mickthetree » Mon Nov 21, 2011 11:40 am

out of interest, are they posi drive or star head?

nickw
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Re: Screws for MDF carcases

Post by nickw » Mon Nov 21, 2011 6:05 pm

The ones I've got are star head - as shown in the pics Jake posted above.
Nick Webb, Fine Furniture, Cambridge
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Re: Screws for MDF carcases

Post by AndrewGG » Tue Nov 22, 2011 1:25 pm

Quick supplementary question
If I used these Spax MDF screws on a visible face, set them below the surface and used some filler before priming/sanding/painting - would they disappear or is that asking for trouble?

I have some fitted bookcases to put together from MRMDF and having seen this thread am now thinking that biscuits and screws would be the most effective way to assemble each unit (all shelves fixed position). Just wondering if I would be safer to dispense with the screws for the one showing end.

Thanks
Andrew

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Re: Screws for MDF carcases

Post by karl » Tue Nov 22, 2011 8:34 pm

If they're painted, you should be fine with some two part filler, or you could use a pocket hole jig on the top of the unit - screwing into the side panel, if you understand me.

Cheers

Karl

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Re: Screws for MDF carcases

Post by AndrewGG » Wed Nov 23, 2011 7:17 pm

Confirmation...plus encouragement to buy more tools!. Can't ask for more in a reply, think Kreg pocket hole jig needs to go on my Christmas list.
Thanks Karl,
Andrew

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Re: Screws for MDF carcases

Post by promhandicam » Wed Nov 23, 2011 8:58 pm

Andrew,

For occasional use, this is more than adequate and what I use when I need to put a pocket hole screw in something. You can hold it in place with a regular one handed clamp or quick clamp.

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Re: Screws for MDF carcases

Post by Mr Ed » Wed Jan 09, 2013 7:48 pm

Old thread I know, but I just bought a few boxes of the Spax MDF screws and first impressions are good, although they are an odd looking screw.

A question; are people using the Spax driver bit (which I think has a pimple on the end) or just a Torx 20? The reason I ask is with a regular Torx bit they seem a bit wobbly.

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Re: Screws for MDF carcases

Post by promhandicam » Wed Jan 09, 2013 8:13 pm

I think I just use an ordinary torx bit - I don't think I've got a pimple on the end of mine - at least I didn't the last time I looked :lol:

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Re: Screws for MDF carcases

Post by Mr Ed » Wed Jan 09, 2013 8:38 pm

http://www.spax.com/uk/technical-terms/ ... star-plus/" onclick="window.open(this.href);return false;

This is what I was referring to - it seems to suggest the pimple gives a more positive fit

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Re: Screws for MDF carcases

Post by modernist » Wed Jan 09, 2013 11:03 pm

I re-read most of that thinking I've read this before - and I had :oops:
Cheers

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