Such kind of helical internal gear usually require profile modification and the accuracy is ISO6-7 ,before every shipping ,we will provide below these reports to customer to check the helical ring gear details to make sure all are clear understood and good to ship .

1) Bubble drawing

2) Dimension report

3) Heat treat report before heat treat

4) Heat treat report after heat treat

5) Material report

6) Accuracy report

7) Pictures and all testing videos like runout , Cylindricity etc

8) Other testing reports per customers’ requirement like flaw detection report