external screw-threads

Full Title

Making helical bodies or bodies having parts of helical shape (helical gears B21H5/00; forming tubes or tube walls into helical shape B21D11/06, B21D15/04) > external screw-threads

5 direct subcodes

Child Classifications

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B21H 3/022
B21H 3/025
B21H 3/027
B21H 3/04 Making by means of profiled-rolls
B21H 3/06 Making by means of profiled members other than rolls, e.g. jaws, moved longitudinally or curvilinearly with respect to each other