What screws for door hinges?

[JohnBishop]

Hi All,

   This is a silly question but what screws are for regular interior door hinges?
I think it is M4 x 30mm but I think the thread on those is a bit different?
Please advise. Thanks

[markc]

M4 is a machine thread, not a wood screw. 4mm x 30 is a pretty standard door hinge size into timber

[JohnBishop]

43 minutes ago, markc said:

M4 is a machine thread, not a wood screw. 4mm x 30 is a pretty standard door hinge size into timber

indeed "machine thread" is the term I was missing

[Spinny]

I have often found door hinge screws can work loose over time and you notice when the door starts catching on the frame. Then you tighten them up but they work loose again until the hole gets mashed up and it becomes a running battle.

 

Is there an answer to this ?

- Using 3 hinges ?

- using longer screws ?

- using special screws ?

- using ball bearing hinges ?

[SteamyTea]

It is hard to get two hinges perfectly in line with each other, each hinge has three degrees of freedom, so two hinges have 9 and 3 hinges 27.

So what happens is that a slight misalignment causes movement in at least one hinge, but most probably in all 3.

This causes the screws to be stressed and start to damage the timber they are screwed into.

As for a fix, get all three hinges inline, properly, then use some non expanding PU adhesive down the holes in the frame.  Spray the screws with a bit of WD40, screw it all in place and wait till the adhesive cures.  Do not overtighten.  The WD40 will act as a release agent for when you need to remove the screws.

 

[JohnBishop]

I bought these hinge screws but the thread is different to the original hinge screw on the right side.
I think these HingeTite are to cupboard doors.

Edited yesterday at 14:20 by JohnBishop

[SteamyTea]

1 hour ago, JohnBishop said:

cupboard doors.

Yes, for chip/particle board.

 

I asked my chippy mate about your hinges, he suspected that they are out of alignment, why he uses a jig to router out the correct position, works every time and only takes a few minutes.  His suggestion was to get someone in with a jig and hang them properly.