Owner's manual

6h – 6e

6H – 6G

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. Products - thread turnin

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  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 pro le error.

Thread External/Internal Tolerance classes

ISO metric External

ISO metric Internal

ISO inch External

ISO inch Internal

Whitworth External

Whitworth Internal