Welcome to the Inert Ordnance Collectors.
Results 1 to 10 of 10
  1. #1
    Premium Member
    Join Date
    Dec 2007
    Location
    Ontario / Canada
    Posts
    2,102
    Images
    43
    Thanks
    246
    Thanked 672 Times in 344 Posts

    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
    Premium Member
    Join Date
    Dec 2007
    Posts
    1,461
    Thanks
    340
    Thanked 763 Times in 451 Posts
    2" x 14 tpi, Whitworth form.

    TimG

  3. #3

  4. #4
    Senior Member
    Join Date
    Mar 2015
    Location
    new zealand
    Posts
    245
    Thanks
    0
    Thanked 163 Times in 63 Posts
    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
    Premium Member
    Join Date
    Aug 2007
    Location
    Yorkshire
    Posts
    1,356
    Images
    94
    Thanks
    786
    Thanked 282 Times in 190 Posts
    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
    Senior Member
    Join Date
    Mar 2015
    Location
    new zealand
    Posts
    245
    Thanks
    0
    Thanked 163 Times in 63 Posts
    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
    Senior Member
    Join Date
    Oct 2008
    Location
    Ballarat, Victoria, Australia
    Posts
    364
    Thanks
    254
    Thanked 112 Times in 64 Posts
    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
    Premium Member
    Join Date
    Oct 2008
    Location
    hertfordshire
    Posts
    843
    Thanks
    6
    Thanked 148 Times in 101 Posts
    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
    Premium Member
    Join Date
    May 2010
    Location
    Amersham
    Posts
    149
    Thanks
    143
    Thanked 80 Times in 35 Posts
    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
    Premium Member
    Join Date
    Jun 2009
    Location
    Bristol, UK
    Posts
    762
    Thanks
    290
    Thanked 682 Times in 314 Posts
    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.




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

  12. The Following User Says Thank You to Snufkin For This Useful Post:

    Darkman (30th July 2017)

 

 

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Back to top