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  1. #1
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    Question Help about British standard for screws



    Hi, all

    Please I need some help about screws.
    What means 2 B.A. x 3/4" LG Socket cap Tuflok coated screw

    Some link, drawing....

    Best regards, Josip



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    Re: Help about British standard for screws

    http://www.engineerlive.com/european...uctivity.thtml ---- tuflok

    http://www.gewinde-normen.de/en/index.html ----- thread standards

    http://www.accuratescrew.com/info/SocketRef.htm
    In this last one under point 14 there is something about LG
    Last edited by hiitsme; 11-12-2006 at 07:06 PM.

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    Re: Help about British standard for screws

    Hi, Hiitsme

    Quote Originally Posted by hiitsme View Post
    http://www.engineerlive.com/european...uctivity.thtml ---- tuflok

    http://www.gewinde-normen.de/en/index.html ----- thread standards

    http://www.accuratescrew.com/info/SocketRef.htm
    In this last one under point 14 there is something about LG
    Thanks for links, but for me the most important is 2 B.A. ... is that related to class, material, size, or...?

    Need also some info about W.S.I No. 27 Class 2 and W.S.I No. 136 related to tightening torque...

    Best regards, Josip
    Last edited by Josip; 11-12-2006 at 07:51 PM. Reason: add text

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

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    Re: Help about British standard for screws

    Hi Josip,


    http://en.wikipedia.org/wiki/Screw

    Quote Originally Posted by from above link
    British Association screw threads (BA)
    A later standard established in the United Kingdom was the BA system, named after the British Association for Advancement of Science. Screws were described as "2BA", "4BA" etc., the odd numbers being rarely used. While not related to ISO metric screws, the sizes were actually defined in metric terms, a 0BA thread having a 1 mm pitch. These are still the most common threads in some niche applications. Certain types of fine machinery, such as moving-coil meters, tend to have BA threads wherever they are manufactured.
    Here is another link that tells the whole story...
    http://en.wikipedia.org/wiki/British..._screw_threads

    It looks like the 2BA just tells you the the thread pitch and size.

    Hope that helps

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    Re: Help about British standard for screws

    I didn't know that there is a European standard for screwing


    Chemi

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    Re: Help about British standard for screws

    Hi, US Iceman

    Quote Originally Posted by US Iceman View Post

    It looks like the 2BA just tells you the the thread pitch and size.

    Hope that helps
    Thanks, yes it helps, but nothing about material, pity


    Hi, Chemi

    Quote Originally Posted by chemi-cool
    I didn't know that there is a European standard for screwing
    Chemi
    But now, you find out, some standards always exist

    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

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    Talking Re: Help about British standard for screws

    Quote Originally Posted by chemi-cool View Post
    I didn't know that there is a European standard for screwing


    Chemi
    Here you are not able to find excuses to the miss...:-D

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    Re: Help about British standard for screws

    Hi Josip,

    this 2BA thing....

    Doesn't it mean simply 2 pieces of screws which are BA standard????

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    Re: Help about British standard for screws

    Hi, Hiitsme

    Quote Originally Posted by hiitsme View Post
    Hi Josip,

    this 2BA thing....

    Doesn't it mean simply 2 pieces of screws which are BA standard????
    No , I need 8 pcs (in text is 4+4 2B.A.)

    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

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    Re: Help about British standard for screws

    Hi Josip,

    B.A. stands for British Association thread form.

    They range in size from 0 BA (the largest) which is about the same size as a M6, to I think about a 19 BA which is extremely small. The normal sizes are the EVEN ones 0,2,4,6,8,10,12. They used to be used alot for electrical equipment....still come across them in UK, but metric taking over.

    2 BA is very similar to M5 and the 10-32 UNF. I think they will all thread in each other to a degree (some tight, some loose)

    The material is not dictated to by the BA....you can get them in Steel and also in Brass. Normally have slotted heads.

    The 3/4" LG would refer to the length (19mm). The Socket cap is the Head type which would be a recessed Hex (i.e Allen Key) probably with a knurled edge. I expect these to be Steel with a blackened oxide finish.

    Hope this helps. More info on google.
    Last edited by Electrocoolman; 13-12-2006 at 01:53 AM. Reason: further info

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    Re: Help about British standard for screws

    Quote Originally Posted by Electrocoolman
    I expect these to be Steel with a blackened oxide finish.
    Are these then considered to be heat treated for higher strength?

    Based on your description this sounds a lot like the tiny bolts used in safety heads on large recip compressors..

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    Re: Help about British standard for screws

    Hi US Iceman,
    Yes the black oxide finish screws are heat treated HT steel,.......but currently I cannot find any listed in a BA thread, but that does not mean that they aren't available.

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    Re: Help about British standard for screws

    Hi, all

    Found this on the net

    Nothing about material but I believe any material we need we can use for.

    Best regards, Josip
    Attached Files Attached Files

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

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    Re: Help about British standard for screws

    Dear Josip,

    I think you got all the answers already - all I can add is that BA threads are not much used these days, except in modelmaking and other hobbies. They are pretty small - like the screws that hold the cover plate onto an electrical socket. The LG reference I think was just an abbreviation for "long" - for example 2BA x 6LG is a 2BA thread 6mm long. 2BA only tells you the screw diameter and thread form.

    cheers

    Andy P

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