When to use a single threaded screw and when to use a twin threaded screw

[readiescards]

Been buying screws.

What is the benefit of single threaded screws over double threaded screws? Are they for different jobs/material?

Thanks 

[Construction Channel]

what screws ya been buying?

 

i can't recall ever actually being told the difference or advantages but i would assume the twin threads go in faster but are more aggressive, 

[readiescards]

General wood screws from Screwfix and B&Q. Both seem to shoot on their packaging what style thread they are but no reason given why it was better than the other style.

[Construction Channel]

check a decent company like spax or reisser, they will probably have some good advertising schemes for both types

[Ferdinand]

This may be helpful.

 

http://www.diydoctor.org.uk/projects/screws.htm

 

[Onoff]

My only contribution to the discussion is that I usually pilot EVERY hole still except when using plasterboard screws or SPAX flooring screws which are just amazingly designed things IMHO. 6x100 Goldscrews from S'fix - 5mm (long series) pilot. 5mm screws, 4mm pilot and so on. I countersink too. I don't generally hold with all this self cutting / no splitting spiel. In Contiboard or MDF edges I think a pilot is an absolute must to stop swelling/splitting.

[PeterW]

Got one of these and I think it's great for pilot / countersink

 

http://www.axminster.co.uk/axminster-turbo-drill-countersink-set-of-3-717964

[Onoff]

10 minutes ago, PeterW said:

Got one of these and I think it's great for pilot / countersink

 

http://www.axminster.co.uk/axminster-turbo-drill-countersink-set-of-3-717964

 

Bought a set from Lidl the other day. Parkside brand. Very unusual flute form on the drill but they seem to work.....

[readiescards]

7 hours ago, Ferdinand said:

This may be helpful.

 

http://www.diydoctor.org.uk/projects/screws.htm

 

Very helpful thanks!

[ToughButterCup]

Right, Once you've got them, how do you store the sodding things.......? Eh? Answer me that!

[Barney12]

47 minutes ago, recoveringacademic said:

Right, Once you've got them, how do you store the sodding things.......? Eh? Answer me that!

 

Oh come on everyone knows the answer to that question.

 

"where you can't find them"

[ToughButterCup]

Oh, there! How stoopid could I be? Didn't think of  that.

[Barney12]

11 minutes ago, recoveringacademic said:

Oh, there! How stoopid could I be? Didn't think of  that.

 

 

 

Actually I quite like the Screwfix concept where you buy a metal case and keep it topped up.

i bought my "Goldscrew" mixed case donky's years ago and I just top it up as and when I need it.

its been thrown arround the back of the car, van, site and is pretty bullet proof. 

 

Of course i have have countless other boxes of screw n stuff. In fact shelves full of the blooming things. 

[Ferdinand]

1 hour ago, recoveringacademic said:

Right, Once you've got them, how do you store the sodding things.......? Eh? Answer me that!

 

You get a big wall and screw them in.

 

Innit.

[PeterW]

1 hour ago, Barney12 said:

 

 

 

Actually I quite like the Screwfix concept where you buy a metal case and keep it topped up.

i bought my "Goldscrew" mixed case donky's years ago and I just top it up as and when I need it.

its been thrown arround the back of the car, van, site and is pretty bullet proof. 

 

Of course i have have countless other boxes of screw n stuff. In fact shelves full of the blooming things. 

 

I rate the Fischer screws and I've got the box from Screwfix that is topped up as and when it's needed. They appear on offer a lot so I tend to have a few spare boxes.  

 

I used to use Spax but they don't appear as easy to get hold of anymore and have on some of them changed to a Torx head - I get the reason why but I'm not going out and buying new screwdrivers just for one set of screws ..!

[JanetE]

I've been using this countersinker http://www.screwfix.com/p/erbauer-plug-cutter-countersink-set-4-pieces/86253 it's a plug cutter as well but it's a good design because if the drill bit breaks you can just replace it.  Twin thread screws are pretty expensive and like most everyone I can't see the point 

We've got one of those boxes from screwfix too, they work pretty well, though we do have quite a lot of the smaller screws left.  Still you can always tip them out and replace with more sensible sizes.

[Onoff]

The Screwfix case is great. I've topped it up on occasion with the Goldscrew Plus stuff when they've run out of the "normal" ones. Left the catches off a couple of times and dropped the lot! First time I managed to convince the youngest it was a game to sort them back into sizes but she's wise to it now!

 

This is that Lidl set.....comes in a case. See how the drill bit flutes are weird:

 

 

 

I tend to leave a PZ2 bit and holder along with a countersink bit in my Screwfix case. Also got a few of these type scattered around:

 

http://www.toolsandfishing.co.uk/4-pce-pilot-drill-countersink--screwsink-drill-bit-set-792085-8562-p.asp

 

 

 

 

 

 

Edited October 9, 2016 by Onoff

[MortarThePoint]

Naughty to resurrect an old thread, but @Onoff and @PeterW do you still drill and countersink?

[Onoff]

1 minute ago, MortarThePoint said:

Naughty to resurrect an old thread, but @Onoff and @PeterW do you still drill and countersink?

 

Depends on what I'm fixing. I always pilot drill in whatever. I don't always countersink. I might not countersink in softwood if using say Goldscrews but always will in ply, hardwood, melamine.

[MortarThePoint]

1 minute ago, Onoff said:

Depends on what I'm fixing. I always pilot drill in whatever. I don't always countersink. I might not countersink in softwood if using say Goldscrews but always will in ply, hardwood, melamine.

 

I was wondering about your approach to framing (stud partitions, joists, noggins etc).

 

I haven't tried them, but GoldScrew Plus look interesting as they have the drillbit like feature that Spax have. No idea if it really makes a difference or is just marketing.

[Onoff]

32 minutes ago, MortarThePoint said:

I was wondering about your approach to framing (stud partitions, joists, noggins etc)

 

I still pilot. I'm a bit weird though as I cut through housings in the sole plate and header and slot the studs into that...then add glue and screw.

[Russell griffiths]

4 minutes ago, Onoff said:

 

I still pilot. I'm a bit weird though as I cut through housings in the sole plate and header and slot the studs into that...then add glue and screw.

You definitely need help. 

[MortarThePoint]

4 minutes ago, Onoff said:

I still pilot. I'm a bit weird though as I cut through housings in the sole plate and header and slot the studs into that...then add glue and screw.

 

Interesting. I had wondered if anyone ever glues and screws noggins.

[Onoff]

29 minutes ago, Russell griffiths said:

You definitely need help. 

 

I don't always do it...and draw the line at noggins...

[PeterW]

2 hours ago, MortarThePoint said:

Naughty to resurrect an old thread, but @Onoff and @PeterW do you still drill and countersink?

Only for hidden work and when I’m plugging stuff with wood plugs. Now use Reisser as I get them when they are on offer at TS or Howdens and are really good.