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  1. #1
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    18pr Fuze thread size

    What is the 2" thread size for the the No 80 fuzes tap & Die. A friend wants to hunt
    such a thing down. But I need to know what the proper designation is.

  2. #2
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    2" x 14 tpi, Whitworth form.

    TimG

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  4. #4
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    the taps shown in the pictures on that website aren't 2'' and 28 pounds seems a bit cheap for a tap as big as 2''?

  5. #5
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    Quote Originally Posted by kiwieod View Post
    the taps shown in the pictures on that website aren't 2'' and 28 pounds seems a bit cheap for a tap as big as 2''?
    £84 for a HSS tap, I guess £28 tap will be carbon steel, ok for thread cleaning. I think the picture is a generic picture, not of the actual 2" tap. There are a couple on ebay for around £50, in uk and Australia....

    Cheers
    Gary

  6. #6
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    yes you will have to be careful with a carbon tap as it may chip or break the cutting threads if you push it too hard.very slowly with lots of cutting fluid should do it

  7. #7
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    I'm not sure it's Whitworth.

    From memory it is 2" x 14 TPI BSP (British Standard Pipe). It could be BSC - Conduit, I can't remember off hand without checking. It's quite a hard thread size to get.

    I borrow a friend's taps and dies to clean up fuzes and sockets.

    I think if you look up Whitworth sizes it's not 14 TPI for 2" size.
    Last edited by Darkman; 18th July 2017 at 12:20 PM.

  8. #8
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    What you need to know to match threads is: form, ie Whitworth, metric, unified as this gives the angle and shape of the grooves and ridges, then diameter, then pitch ie how many threads per inch or distance between in mm. Because you can have the same dia and pitch with different forms some of which will not go together and you can have standard pitches for a give form and diameter and special pitches for the same form and dia. Virtually all countries ammunition threads are non standard pitches for their diameter.

  9. The Following 2 Users Say Thank You to 2pounder For This Useful Post:

    Gspragge (19th July 2017), highlandotter (18th July 2017)

  10. #9
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    I guess the best way to find out for sure would be to send the tool company a fuse adapter from, say, an 18 Pdr Shrapnel and ask them to check it with a screw pitch gauge.

  11. #10
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    As TimG stated in post #2, it is 2" x 14 tpi, Whitworth form.

    Specifically it is 2" x 14tpi British Standard Conduit - one of the family of Whitworth form threads.




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    Last edited by Snufkin; 19th July 2017 at 09:43 PM. Reason: sp

 

 

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