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GU 40/92 Gearbox door lock

Discussion in 'Windows and Doors' started by trickstar, 8 Oct 2018.

  1. trickstar

    trickstar

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    looking fo a GU 40/92 Gearbox

    lock has a GU marking on the front and 40/92 on the side.

    IMG_2909.jpg IMG_2905.jpg IMG_2910.jpg
     
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  3. crank39

    crank39

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    The 40 signifies the 'backset, the face of the lock back to the centre line of the cut out for the barrel, 92 is the 'PZ', the distance between centre lines of the handle spindle and the circular portion of the barrel cut out.

    Searching for 40mm backset GU gearbox may yield better results, you may have to upgrade it to a MK2, the GU was notorious for failures
     
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  4. trickstar

    trickstar

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    do you have alink or picture of the MK2?

    also if i upgrade to the MK2 would i need new small hooks/tongues.

    thanks
     
  5. crank39

    crank39

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    No I don't, just do a search and you'll see plenty of results, you'll even see pictures of the newer mk2 GU gearbox, you shouldn't need to replace the hooks as the GU gearbox can be separated from the main strip by removing 2 or 3 little torx screws
     
  6. chunkybuns

    chunkybuns

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    I'm also looking for a couple of these. did you find a supplier??
     
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  8. trickstar

    trickstar

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  9. Gazman16

    Gazman16

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  10. crank39

    crank39

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    NWH used to keep stacks of the 35mm backset in, not sure on the 40mm though
     
  11. Mark Monmouth

    Mark Monmouth

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    Will the Mk2 style GU gearboxes fit as straight replacements for the old style ones?

    I need to replace a broken 40/92 old style gearbox. It seems the old style ones are now only available in a 30mm or 35mm backset but I definitely need 40mm.

    If possible I want to keep the other existing bits (strip etc.) and I want to avoid having to rout the wooden door.

    Any suggestions on suppliers welcome too.
     
  12. lostinthelight

    lostinthelight

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