Sandvik Coromant Threading - Manual (Page 53)

53
6h – 6e
6H – 6G
2A
2B
A
—
3. Products - thread turning
Tolerance classes with CoroThread® 266
CoroThread 266 turns threads in the following tolerance classes,
in metric, inch and Whitworth systems by concentrating only on the
pitch diameter.
Other tolerances available with CoroThread® 266
It is possible to turn threads to fi ner and courser tolerances with
CoroThread 266. However, additional measurements of external
major and pitch diameter, and internal minor and pitch-line diam-
eters must then be made.
To accurately measure the pitch diameter, use a wire thread placed
in a normal micrometer. The most commonly used is a ‘stop and
go’ gauge which gives an accurate reading of the level of diameter
or profi le error.
Thread External/Internal Tolerance classes
ISO metric External
ISO metric Internal
ISO inch External
ISO inch Internal
Whitworth External
Whitworth Internal