Mk1 Screw sizes?

15 comments

  1. Bought a set of new Mk1 rear light lenses from DSN Classics but the 6 screws supplied don't seem to fit the original backplate threads? I wanted to use new ones as one old screw (shouldered)is missing and the rest are rusty. Any ideas on the correct thread size? Also the plastic lenses don,t fit as well as the old ones is this because they are copies? (PS. What adhesive should I stick the reflector silver foils in with?)
    Same problem with no.plate hinge screws (6-off)….these came from Somerfords but seem too long and don't want to screw into captive nuts in original Mk1 bootlid? Minispares listing says they should be 3/16th UNF does anyone know if that is correct before I try them?
    I bought a lot of parts at Beanlieu but have to say the general fit and quality of most of the items is poor compared with the original parts even from the well known Mini traders.
    I have owned classic Minis for 30 years but perhaps I have been too spoilt by the spare parts I have fitted to my new MINI where everything seems to fit first time and work as intended!
    Thanks for any help or advice.

  2. imported post

    Hi Mab01,

    I can't tell you the size of the light lens screws butthe 6 number platehinge bracket screws seem to be #10-32. This size is just a gnats-hair smaller than 3/16' UNF and seems to be used in many places around the car. Hope this helps.

    Al

  3. imported post

    Thanks Al, that helps a lot, the hinge screws I have do seem to be slightly too big just as you describe.
    PS. Maybe the light lens screws are for later reproduction rear light backplates only and I need to track down some original BMC shouldered screws from someone?

  4. imported post

    The screws are all listed here via Somerford Mini Specialists PDF parts list: –

    [url]http://www.somerford-mini.co.uk/pdfs/Catalogues/Electrical-Inst/11-Rear-Lamps-Interior-Lamps.pdf[/url]

    It's worth trying, but it doesn't mean their screws will work with the light unit you bought from DSN.

    If you want perfect fitting parts, then you really should buy O/E genuine stuff (where available of course).

    After all would you buy pattern copied parts for you're BINI?

  5. imported post

    [b]mab01 wrote: [/b] “Thanks Al, that helps a lot, the hinge screws I have do seem to be slightly too big just as you describe.
    PS. Maybe the light lens screws are for later reproduction rear light backplates only and I need to track down some original BMC shouldered screws from someone?”

    Hi Mab01,

    I am not sure if the thread size #10-32 will be recognized in the UK, it may be American but there will be a UK equivalent, maybe 5/32' UNF or something.

    Al

  6. imported post

    [b]Alasdair Brass wrote: [/b] “[b]mab01 wrote: [/b] “Thanks Al, that helps a lot, the hinge screws I have do seem to be slightly too big just as you describe.
    PS. Maybe the light lens screws are for later reproduction rear light backplates only and I need to track down some original BMC shouldered screws from someone?”

    Hi Mab01,

    I am not sure if the thread size #10-32 will be recognized in the UK, it may be American but there will be a UK equivalent, maybe 5/32' UNF or something.

    Al

    [b]Hello![/b] [font=Arial][size=2]:cool:

    10-32 is in effect 3/16 UNF below ¼� they use SWG ( Standard Wire Gauge) to refer to the diameter and 32 is the TPI (Threads Per Inch)

    I hope this helps
    [/size][/font]

  7. imported post

    Hi Ronnie,

    The problem is that a 3/16' UNF screw is tight in the threads but a #10 32 is just right, so it seems to besmaller.

    Al

  8. imported post

    [b]Alasdair Brass wrote: [/b] “Hi Ronnie,

    The problem is that a 3/16' UNF screw is tight in the threads but a #10 32 is just right, so it seems to besmaller.

    Al

    If plated bolts are used (as they should be) it might be a plating problem 🙂
    The screws in the lucas lights will possibly be BA (British Association)
    RON.

  9. imported post

    Thanks everyone for your help you have confirmed what I thought. Using the thread info etc, you have supplied I will have to try searching for the right original parts to fit. 🙁

  10. imported post

    Unfortunately mab01 you're finding out what a lot of us already knew – that a lot of the reproduced stuff is utter rubbish. This is why genuine new old stock BMC original parts fetch so much money…. I never did find the correct rear lens screws for my Mk1 Cooper despite ordering a set from a well known large Mini specialist….they were nothing like right and I cleaned up and resilvered the originals in the end.

    I have also noticed a few NOS rear lights on ebay with screws missing and as far as I know, nobody has reproduced the correct item yet. It is not just a matter of the thread. The head and shoulder also need to be right. There should also be a fibre washer.

    Personally I would rather have the right parts secondhand than the wrong parts new, but even good secondhand parts are getting hard to find now.

    We'll all have to keep searching!

  11. imported post

    If anyone needs a supply of screws, nuts, bolts in imperial sizes like BA and UNF this company NAMRICK Ltd have been recommended to me:-
    [url]http://www.namrick.co.uk/default.asp[/url]

  12. have read throught the above posts and i see that the correct rear light screws where unavalible in 2007

    well the time now is 2010 and is there a supplier supplying the correct screws. I can get normal bolts from my local bolt shop but would be nice to get the correct ones.

    the old ones are ******!

    thanks dave

  13. The original Lucas rear light screws have a 4BA thread, while the modern reproductions use a slightly larger M4 screw. The number plate hinge screws should be No 10 UNF x 1/2' – if the ones with which you have been supplied are too large then they may well be M5.

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