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PCE
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CPC Main Group
B21H 3/00

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)

4 direct subcodes

Child Classifications

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  • B21H 3/08 internal screw-threads
  • B21H 3/10 twist-drills; screw-taps
  • B21H 3/12 articles with helicoidal surface (bending strip or the like helically B21D11/06)