7/16 x 19 tpi tap, and die
 

As the title says I am in need of a 7/16 x 19 tpi tap and die. Would prefer the tap to be a plug tap but a 2nd will do.
7/16 x 19 was used on Austin 7 fuel systems , also know as " uns " thread or " gas " thread.
The tap is more urgent than the die at the moment .

Alternatively does anyone know where I can buy them, as I have scoured the internet with no joy as yet

Try Tracey Tools
http://www.tracytools.com/taps-and-d...roduct_id=1087
Bill.

Although listed with Tracy Tools they are out of stock , and cannot say when new stock might arrive

Ebay item 221635992766

Ebay item 221635992766 - BSF - 18 tpi.
Bill.

7/16 x 19 TPI TAP AND DIE
 

There is a useful chart on the Internet - `A COMPLIATION OFTHREAD SIZE INFORMATION ` which lists all thread diameters
pitches , etc, etc .

7/16 x 19 tpi is not listed - could this be a case of mistaken tpi measurement - could it not be 18 tpi ? .

7/16 x 18 is BSF and I would have thought a pre- war Austin 7 would have used all BSF threads where possible.

The only other alternative is 7/16 x 20 tpi which UNF - that would not have been in common useage of that period Austin.

MARK

Having spent my entire working life in engineering ( marine , and then production ) I know that threads are a minefield ,
This particular thread has been checked with micrometer and with thread gauges for the tpi .
Without doubt it is 7/16 x19 tp[ .
The thread is listed in the engineers handbook ( engineers bible ) but it is no longer in common use , mainly used for gas taps , and fuel systems .( ie Austin 7 )
If push comes to shove , then I will make a tap .as I only need it for tapping brass

Early Gardner paraffin engines used this size and thread on the big end caps.