The Difference of Metric Threads and US/British Threads

Pipe thread or hydraulic hose fitting is mainly used for pipe connection, the internal and external threads work tightly, with two types of straight pipe and cone pipe.

Nominal diameter refers to the diameter of the pipe to which it is connected, and it is clear that the diameter of the thread is larger than the nominal diameter. 1 / 4, 1 / 2, 1 / 8 is the nominal diameter of the British thread, the unit is inch.

The difference of metric threads and US/British threads

1. Metric threads like metric thread bite type tube fitting are measured by the thread pitch, and the US or British thread is counted by the number of teeth per inch, this is their biggest difference.

2. Metric thread is 60 degrees equilateral tooth type, British thread is 55 degrees equiaxed tooth type, US thread is 60 degrees.

3. Metric thread uses metric units, the US and Britain threads use British units.