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7/16" British standard Pipe

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  • 7/16" British standard Pipe

    Other day Malc the scrappie called in for a cuppa and to see if he could borrow a 7/16" BSP die.
    I said I'd never heard of one, didn't mean to say there wasn't one, just I'd not heard of one.

    He insisted he'd got the taps but no die.

    So looked in various books, World screw threads, MH, Machinery screw threads book but all list 1/4", 3/8" then 1/2"
    Even the specialised tap and die people don't list one.?

    Anyway he popped in again to day with a tap and sure enough it's clearly stamped 7/16" BSP x 19 threads and it looks to be about the right size, looks close to a 3/4" UNF as a guide size.
    Even took a picture [ left the camera in the shop ]

    Anyone else heard or seen of a 7/16" BSP ??
    .

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.




  • #2
    Probably french ..they have bsp ..and all sorts of odd ball stuff in inches that doesnt match ours .

    all the best.markj

    Comment


    • #3
      Not on the canuck side of the ocean, and according to

      http://www.britishfasteners.com/threads/bstp.html

      not on your side either.

      But the taper is stated as 3/4" per foot or 1 in 16 on the diameter.

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      • #4
        That's a weird one, John, and no mistake.
        Any maker's name on the tap?

        Comment


        • #5
          Thats not too far out gents .
          When Engineering designed a hole for special tube (s) but nothing standard worked, I made a 5/16-18 NPT custom tap for them.

          Using a Geometric die head makes it a simple matter, as they are adjustable quite a bit, and that means taking a standard die set and either open it up, or close it down to get the right specs. I used a 1/4-18 NPT and it handled the 5/16" size perfectly
          Made the tap with the Geo, and then threaded the tubes with the same setup

          Rich
          Green Bay, WI

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          • #6
            Maybe check with the cycle shops?

            http://www.ebay.com/itm/T-junction-7...-/380294370383

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            • #7
              Oops.

              Revised and deleted.
              Last edited by oldtiffie; 03-20-2012, 02:59 AM.

              Comment


              • #8
                As a plumber who tries to use my homeshop hacking lack of skills combined with my plumbing experience I try to help people out who have obsolete taps. One that comes up all the time and I cant get a tap or die for it is a stopcock that is 19 tpi and the od is 18.8 mm give or take. Its a pain in the arse because I have to single point turn it. I would be real curious to know if its the same as the local tap and die manufacturers cant get me one.

                Comment


                • #9
                  Originally posted by John Stevenson
                  Other day Malc the scrappie called in for a cuppa and to see if he could borrow a 7/16" BSP die.
                  I said I'd never heard of one, didn't mean to say there wasn't one, just I'd not heard of one.

                  He insisted he'd got the taps but no die.

                  So looked in various books, World screw threads, MH, Machinery screw threads book but all list 1/4", 3/8" then 1/2"
                  Even the specialised tap and die people don't list one.?

                  Anyway he popped in again to day with a tap and sure enough it's clearly stamped 7/16" BSP x 19 threads and it looks to be about the right size, looks close to a 3/4" UNF as a guide size.
                  Even took a picture [ left the camera in the shop ]

                  Anyone else heard or seen of a 7/16" BSP ??
                  Not me, though I'll have a look later just in case I have anything.
                  5/8" BSP seems to have continued in use long after anyone made any 5/8" pipe, engine drain cocks was one instance, & I have a couple of 'modern' 5/8" BSP taps.
                  Yes you could probably cut the threads with a die head, but who determines the standard size since the 'size' is based on pipe nominal ID? There are odd 'Whitworth' sizes which don't appear in most of the books, I think I've got 5/32" taps, but they're easily defined by interpolation.

                  Tim

                  Comment


                  • #10
                    Mike,
                    Yes makers name but I didn't get a photo of that, Somebody I had not heard of in Sheffield.

                    Last chance is i have one very obscure thread book but can't seem to lay my hands on it at the moment.

                    It's dark green, so big.......... by so big.................. and hiding somewhere. I;ll have another look later and also post the pic of the tap.
                    .

                    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                    Comment


                    • #11
                      Why is he wanting a die?
                      Why is he wanting to tap a hole 7/16" BSP?
                      Why did he tap a hole 7/16" BSP?
                      Where is he going to get the pipe to put in said hole?
                      If the hole exists why not thread something in the lathe for him?
                      Why have you got nothing better to do?

                      Comment


                      • #12
                        Originally posted by Mark McGrath
                        Why is he wanting a die?
                        Because it's hard to cut an external thread by hand with a tap.

                        Originally posted by Mark McGrath
                        Why is he wanting to tap a hole 7/16" BSP?
                        Because it's the next size up from the stripped 3/8" BSP.

                        Originally posted by Mark McGrath
                        Why did he tap a hole 7/16" BSP?
                        Because he had the tap.

                        Originally posted by Mark McGrath
                        Where is he going to get the pipe to put in said hole?
                        Don't need a pipe, needs a bung.

                        Originally posted by Mark McGrath
                        If the hole exists why not thread something in the lathe for him?
                        Probably have to.

                        Originally posted by Mark McGrath
                        Why have you got nothing better to do?
                        Because I have to answer stupid questions and screwcut a bung.
                        .

                        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                        Comment


                        • #13
                          Originally posted by John Stevenson

                          Because I have to answer stupid questions and screwcut a bung.
                          Ha ha. need to male message longer

                          Comment


                          • #14
                            OK as promised.



                            From a different angle.



                            Also found the screw thread book I was looking for.

                            Nothing in it but it does have the 5/8" data Tim

                            Definite wierdo this one.
                            .

                            Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                            Comment


                            • #15
                              This does not really help your search but said size seems to be "common" fuel taps and fuel control taps...not sure what those are or where they are from...just saying, someone somewhere is making/selling them...

                              http://www.classic-car-accessories.c...-and-fittings/

                              so it could be common from some distant past time, no longer used except for repair/replace of classic cars

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