Converting Imperial and Metric threads to U.S. Threads

[SmithDoor]

A lot of cutting tool shops have free wall thread charts, at least in NZ
If you really want to twist your brain cells study BA threads, which are anglicised metric threads

Sounds like fun .
I have run into the BA threads in past.
I have book with thousands of world threads coverted to inch.
I can see that in NZ running in to BA threads.
The worst BA thread is the 1/8" pipe thread 28tpi very close to 1/8c pipe 27 tpi. They do not play together

Dave

 

[Jasonb]

BA threads are not pipe threads, they only go upto 6mm diameter, Pipe threads used in teh UK, Europe and a lot of metric countries BSP (British Standard Pipe) also know as G threads in the metric world but actually BSP.

 

[SmithDoor]

BA threads are not pipe threads, they only go upto 6mm diameter, Pipe threads used in teh UK, Europe and a lot of metric countries BSP (British Standard Pipe) also know as G threads in the metric world but actually BSP.

Most American lathes do not have 19TPI.
Witch is need for British Standard Pipe threads.
The American lathes have 28tpi 14 tpi and 11 tpi.

Japanese have thre own pipe thread a tap will fix the problem because it is almost impossible to fined

Dave