IPC Subgroup
B21H 3/08 internal screw-threads
Introduced: September 1968
Last revised: January 2006
Full Title
Making helical bodies or bodies having parts of helical shape > internal screw-threads
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- Subclass:
- MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
Related Keywords
making NUT(S) by rolling