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This topic contains 9 replies, has 6 voices, and was last updated by Richard 4 months, 3 weeks ago.

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  • #35000

    johnbarry
    Participant
    @johnbarry

    I purchased these finger plates. They don’t come with screws but I have some. They arrived the holes are countersunk but the screw head (on the screws I have) are still a little big (7mm) and I am frightened of catching on them.

    The holes are 6mm diameter (including countersink) so I am after screws with a 4 to 4.5mm head.

    I have searched many but I am finding they don’t understand a brumy or I don’t understand the head or thread size, I mean what the —– is M2.

    So I am after 8 to 15mm screw length with a 4mm to 4.5mm head in diameter.

    like this

     

    It's said to be easy when you know how. If you don't know how, then you need the help of forumites.

    Cheers
    John

Viewing 9 replies - 1 through 9 (of 9 total)
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  • #35001

    Boris
    Moderator
    @boris
    Forumite Points: 1,732

    John

    How about ?

    https://www.ebay.co.uk/itm/Zinc-BZP-SOLO-WOODSCREW-DOUBLE-COUNTERSUNK-SOLOC-Screws-3-5-4-0-4-5-5-0-6mm/254269284772?hash=item3b33a161a4:m:m_9yHItR6FpZfiAZtwYXbBw

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    #35005

    johnbarry
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    @johnbarry
    Forumite Points: 3,035

    nice one I ordered some 4mm x 15mm sadly the 4.5mm start at 40mm (length),

    Them should do, thanks.

    It's said to be easy when you know how. If you don't know how, then you need the help of forumites.

    Cheers
    John

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    #35007

    wasbit
    Participant
    @wasbit
    Forumite Points: 612

    M2 is a machine thread (the type which takes a nut) where the shaft is 2mm thick.

    Wood screws are mainly metric now which relates to their thickness. The head size can vary between brands.
    IIRC the old No6 screws were approx 3.5mm & No8 4mm
    If the countersink (csk) is 6mm, I’m guessing that the hole will be 4mm & as it’s a thin plate you will probably need 3.5mm csk screws to make sure the heads sit below the surface.

    If the ones you’ve ordered don’t fit (I suspect they might still be too large), let me know & I’ll send you some – although a box of 200, 3.5 x 15mm is only £1.41 from Toolstation or Screwfix. I would drill 2.5mm pilot holes.
    Try them in the plates without screwing them down otherwise the screw holes will be too big if you need smaller screws.

     

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    wasbit

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    #35008

    johnbarry
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    @johnbarry
    Forumite Points: 3,035

    Thanks Wasbit

    Maybe the 3.5mm will be better, cheers for the offer they don’t rob the bank so I have now ordered some 3.5mm.

    It's said to be easy when you know how. If you don't know how, then you need the help of forumites.

    Cheers
    John

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    #35022

    Bob Williams
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    @bullstuff2
    Forumite Points: 5,749

    If I need anything like that JB, my first option is the local Screwfix. For anything I want to match up, I take one to Screwfix and they take the time to match up whatever it is.

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    #35084

    johnbarry
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    @johnbarry
    Forumite Points: 3,035

    Bob I went to screwfix, I hadn’t got one to match up. I said to the assistent I was after a countersink with a 3.5mm head and 15mm thread. She said we don’t sell in those sizes and didn’t know what I meant, it took me 20mins to get her to understand. The box of screws she sold me clearly states (on the box) 3.5mm x 16mm?

    It's said to be easy when you know how. If you don't know how, then you need the help of forumites.

    Cheers
    John

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    #35091

    Boris
    Moderator
    @boris
    Forumite Points: 1,732

    The old designation of these screws as 6 x 5/8″ (6 head/5/8″ length) can become 3.5 x 15mm 0r 3.5 x 16mm now according to whoever is selling/measuring them ?

    Never trust an atom - they make up everything !

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    #35092

    Wheels-Of-Fire
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    @grahamdearsley
    Forumite Points: 4,123

    https://www.diydoctor.org.uk/projects/screwsize.htm

    I found the above guide to wood screw sizes. It may help someone ?

    The size of machine screws and bolts using the M standard also specifies the thread pitch and spanner/screwdriver size. You can find a list in the Wiki for M screw sizes.

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    #35102

    Richard
    Participant
    @sawboman
    Forumite Points: 2,303

    Thank you, that could be very useful. The document is saved for later study. I currently really like the hex drive screws that you can get. They are so much more certain than the other styles of drive with a tendency for Posidrive to let me down,. This is possibly due to my increasingly feeble hand grip; arthritis and tendon pulley troubles really do not help.

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