Wanted: 1 3/4" BSP Tap

[vincentvega]

I have an aluminium fuel tank in my boat and the filler neck is deformed. The thread is 1 3/4" BSP.

I was going to use a steel pipe fitting to reform the thread, but they don't exist in 1 3/4"

Does anyone have any idea what sot of industry would use a 1 3/4" Tap? I am hoping to find a business somewhere that has one that i can pay to use for 5 minutes. I almost got lucky at a fuel tank fabricator this morning but his tap turned out to be 1 1/2"

I'm in Brisbane. Thanks

[.RC.]

No such thread as 1 3/4 BSP

What is the OD and tpi?

[vincentvega]

maybe in your world. but there is a 1 3/4" BSP filler neck in my fuel tank...

BSP (British Standard Pipe) Thread Data BSP and BSPT taps (http://www.newmantools.com/taps/bsp.htm)

First table. 1-3/4" BSP - 11TPI - Major Diameter 2.116"

[.RC.]

Well well so there is such a thread... BSP Whitworth Pipe Thread DIN ISO 228 (DIN 259) (http://www.gewinde-normen.de/en/whitworth-pipe-thread.html) Be surprised if you can find anyone with a tap though... Such an odd ball size..

If someone had a suitable lathe they could zip you up a steel thread pretty quick.. I could easily do it if you get stuck and post it down...

[vincentvega]

thanks for the offer mate. much appreciated. I will PM you.

[bob colles]

BSP Taps are oversized - Chances are it is actually a BSP tap. However, if it isn't then it is probabably an NPT or NPS. I will have a look around today and see if I can find something that matches your description.

[vincentvega]

The catalog I ordered the new filler cap out of definately listed it as 1 3/4" BSP

[cfish]

Someone who does hydraulics like Enzed should be able to help you out, stuff like this this is a nightmare in oz, metric or imperial all the same to some people :no:

[vincentvega]

so after much hunting around i could not find a 1 3/4" BSP pipe fitting or tap in Brisbane. So I took .RC. up on his offer and he sent me this:

http://img.photobucket.com/albums/v606/OzRinger/thread012.jpg

what a piece of work!

I then milled 4 slots in the sides of the thread to make my "tap" and finally tacked an old socket in the top to allow me to connect a sliding T handle.

http://www.ausubaru.com/coppermine/albums/userpics/10043/normal_IMAG0345.jpg

crossed my fingers and gave it a go

http://www.ausubaru.com/coppermine/albums/userpics/10043/normal_IMAG0341.jpg

it took a lot of pressure to turn but eventually cut a nice new thread. stoked!

Thanks again richard for your help. It is much appreciated. :2tsup:

If anyone ever needs to clean up a similar thread the tool is available for loan for the cost of return postage. :D

[eskimo]

that was too easy....great work to you all