1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Fused Connection Unit - screws not long enough for wall!!

Discussion in 'Electrics UK' started by OasisFan79, 29 Jul 2012.

  1. OasisFan79

    OasisFan79

    Joined:
    16 Feb 2009
    Messages:
    115
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Started out what should have been a simple job - to change a faulty fused switch box in the house.

    I took the old box off the wall and wired up the new one.

    When I came to screw the new box back on to the wall, the left screw went in fine but the right screw was too short.

    The new box is an MK and is ever so slightly thicker than the old one.

    What really annoyed me though was that the bits that the screws go into in the metal unit that's in the wall, the screw holes aren't the same distance - the right one is further back hence the reason that the screw won't screw in.

    Presumably you can get longer screws for this sort of thing?

    The screws I have are 28mm which is not long enough to get any grab on the right screw hole. The hole in the metal casing in the wall is too far back.
     
  2. Sponsored Links
  3. wingcoax

    wingcoax

    Joined:
    1 Mar 2009
    Messages:
    1,948
    Thanks Received:
    158
    Location:
    Blackpool
    Country:
    United Kingdom
    Too late today, but you can get longer screws from most electrical shops.
     
  4. OasisFan79

    OasisFan79

    Joined:
    16 Feb 2009
    Messages:
    115
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Cheers mate. I was hoping that would be the answer.

    Thanks v.much.
     
  5. SimonH2

    SimonH2

    Joined:
    4 Nov 2010
    Messages:
    5,376
    Thanks Received:
    550
    Location:
    Cumbria
    Country:
    United Kingdom
    That's fairly common, especially if the person fitting them didn't bother trying to get the backbox straight in the wall.
    Yes indeed, definitely up to 4" if you need them. Incidentally I did a job last year (putting some speakers up, builder's spark has installed the cabling) where even 4" screws weren't long enough :eek: The back box had been fitted before the building was lined with an insulated foam/plasterboard sandwich - and for one of the boxes, he'd had to use extensions as well as 4" screws. They were a right b***ard to get back in as well - trying to hit the hole with a 4" screw that only just reaches and you can't see where it's going (no sniggering at the back :LOL:).

    EDIT: You may find you can only find screws that are far too long. If this is the case, you just need to cut them down.
    Not just available from electrical shops, many good hardware shops will also have them.
     
  6. OasisFan79

    OasisFan79

    Joined:
    16 Feb 2009
    Messages:
    115
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    The screw holes in the back box were actually at differing depths by design - they are molded into position.

    Frustrating that's for sure.
     
  7. sparkwright

    sparkwright

    Joined:
    20 Aug 2009
    Messages:
    7,063
    Thanks Received:
    856
    Location:
    Dorset
    Country:
    United Kingdom
    Or you could try packing the back box out from the wall a fraction with something. :idea:
     
  8. sparkwright

    sparkwright

    Joined:
    20 Aug 2009
    Messages:
    7,063
    Thanks Received:
    856
    Location:
    Dorset
    Country:
    United Kingdom
    Or you may be able to swap some screws round on some other sockets etc around the house. :idea:
     
  9. OasisFan79

    OasisFan79

    Joined:
    16 Feb 2009
    Messages:
    115
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    I will get some longer screws. My dad will probably have some.
     
  10. Sponsored Links
  11. Taylortwocities

    Taylortwocities

    Joined:
    28 Jul 2006
    Messages:
    18,723
    Thanks Received:
    1,870
    Location:
    Oxfordshire
    Country:
    United Kingdom
    Nah, they will be Whitworth thread or something.
    Socket screws are M3.5. Get the right ones or you'll strip the fixings and you'll be into changing the back box----------------and you don't want to do that!!
     
  12. OasisFan79

    OasisFan79

    Joined:
    16 Feb 2009
    Messages:
    115
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Right. Cheers.

    Where's the best place to get some of those? Bearing in mind I only need 1!
     
  13. RF Lighting

    RF Lighting

    Joined:
    31 Mar 2006
    Messages:
    19,119
    Thanks Received:
    1,227
    Location:
    Leeds
    Country:
    United Kingdom
    I think B&Q sell them in packs of 4
     
  14. OasisFan79

    OasisFan79

    Joined:
    16 Feb 2009
    Messages:
    115
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Excellent.

    The ones that were too short were 28mm.

    I'll pick some longer ones up from there.
     
  15. wingcoax

    wingcoax

    Joined:
    1 Mar 2009
    Messages:
    1,948
    Thanks Received:
    158
    Location:
    Blackpool
    Country:
    United Kingdom
    You probably only need 40mm and if you cut them down remember to clean the end of the thread otherwise you will strip the thread.
     
  16. OasisFan79

    OasisFan79

    Joined:
    16 Feb 2009
    Messages:
    115
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Ok cheers.
     
  17. SimonH2

    SimonH2

    Joined:
    4 Nov 2010
    Messages:
    5,376
    Thanks Received:
    550
    Location:
    Cumbria
    Country:
    United Kingdom
    Actually I think they were something like 2BA, until fairly recently we still had some left in our house.

    Still have jars of BA screws and nuts on the shelf in the garage :)

    Prompt long debate on what the thread actually was :rolleyes:
     
Sponsored Links
Loading...

Share This Page