external screw-threads

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Making helical bodies or bodies having parts of helical shape > external screw-threads

CPC:

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

CPC subdivides this area 3x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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B21H 3/022 CPC only CPC only
B21H 3/025 CPC only CPC only
B21H 3/027 CPC only CPC only
B21H 3/04 Making by means of profiled-rolls +1 CPC IPC+CPC Available in IPC and CPC
B21H 3/06 Making by means of profiled members other than rolls, e.g. jaws, moved longitudinally or curvilinearly with respect to each other +1 CPC IPC+CPC Available in IPC and CPC