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  1. #1
    Join Date
    Aug 2002
    Location
    Boyne Island, Queensland
    Age
    52
    Posts
    176

    Default Metric nuts and bolts

    Does anyone know why a 10mm metric bolt/nut sometimes has a 17mm head and more and more often these days (it seems) has a 16mm head. 12mm fastners are the same (use to always be 19mm but 18mm seems to be gaining popularity, I've also come across a few 11mm heads on 6mm bolts (generally 10mm).

    Any thoughts?

    Dan

  2. #2
    Join Date
    Jul 1999
    Location
    Brisbane, Qld.
    Age
    48
    Posts
    579

    Default

    Yeah Buy a Shifter!

    Mwahahaha...

  3. #3
    Join Date
    Aug 2003
    Location
    Nelson Bay NSW
    Age
    81
    Posts
    18

    Default

    The price we paid for going metric. To the best of my knowledge all Aussi bolt manufaturers still make Whitworth threads. Metric stuff is imported and it depends on the country of origin as to the standard they follow. Reflected in the price, Whit still cheaper!

    Glenn
    In Jus Voco Spurius
    http://www.metalbashatorium.com

  4. #4
    Join Date
    Aug 2003
    Location
    Perth (NOR)
    Age
    79
    Posts
    0

    Default

    My guess would be that those bolts come from countries that buy redundant/outdated tooling. The bolt heads are still done in presses that are actually for imperial bolts. The thread is cut on metric machines. Quite often if you measure the unthreaded part of the bolt you will find that it is not metric but actually closer to a imperial equivalent. A 11 mm spanner usually fits a 1/4" bolt head and a 10 mm spanner fits a 6 mm bolt head.........mix the two and you get a 6 mm bolt thread with a 11 mm head. Same apply to the nuts that they supply.

    Could that be called.........cutting corners and making a buck no matter what?




    Thats my guess for what its worth

  5. #5
    Join Date
    Aug 2003
    Location
    Hobart, Tassie
    Age
    59
    Posts
    14

    Default

    Most bolts/nuts in Oz are now made in SE Asia. Even Ajax outsource most these days from there (or so I heard).
    If its got big teeth it eats meat, That includes power saws.

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