Features common to bolt and nut

Introduced: September 1968

CPC subdivides this area 3x more granularly than IPC with 4 additional codes.

4 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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F16B 33/002 CPC only CPC only
F16B 33/004 CPC only CPC only
F16B 33/006 CPC only CPC only
F16B 33/008 CPC only CPC only
F16B 33/02 Shape of thread; Special thread-forms (; used as screw-locking device F16B39/30) +1 CPC IPC+CPC Available in IPC and CPC
F16B 33/06 Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure IPC+CPC Available in IPC and CPC