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  1. 19th September 2012, 07:35 PM #1
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    morrisman
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    Default Dial gauge point standards

    Hi

    I am wondering if the thread used on the point of dial gauges , where different shaped points can be fitted, has been standardized ?

    Some of them are 4-48 which is a metric thread I think ?

    Not sure about the older makes used, like Mercer or Mahr ?

    Mike
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  3. 19th September 2012, 08:35 PM #2
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    Default

    Hi Mike
    Some are 4-48 (imperial) and some are M2.5 I don't know for sure but if it is British or American its probably 4-48, Asian or European it should be M2.5. The threads are very close, M2.5 has a pitch of .45, 4-48 translated to metric is 2.27 dia with a pitch of .53. Not easy to check unless you have a pitch gauge.
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  4. 19th September 2012, 08:47 PM #3
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    Quote Originally Posted by Ueee View Post
    Hi Mike
    Some are 4-48 (imperial) and some are M2.5 I don't know for sure but if it is British or American its probably 4-48, Asian or European it should be M2.5. The threads are very close, M2.5 has a pitch of .45, 4-48 translated to metric is 2.27 dia with a pitch of .53. Not easy to check unless you have a pitch gauge.

    Ah ... OK Ewan , it sounds a little complicated seeing as the two you quoted are so close dimensionally ..you learn something every day as you said
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