pitch gauge 20 sheet Ww 55°

20 x Whitworth Thread 55°
4 - 4,5 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 16 - 18 - 19  - 22 - 24 - 26 - 28 - 30

Pitch gauges are suitable for measuring an internal and an external thread pitch. They work
under the light-gap method. The gauge is put on the tested thread and then you check if
the pitch of the thread matches to the used gauge. Each sheet represents one pitch of a thread.

Several gauge sheets are put together fan-like. There are different combination of sheets
for metric threads and inch threads from 6 sheets up to 58 sheets in just one tool.