Security doors are generally made of metal and belong to the sixth category, while wooden doors belong to the nineteenth category. The specific classification is as follows:

1. Category VI ordinary metals and their alloys; metal building materials; movable metal buildings; metal materials for railway tracks; ordinary metal non-electrical cables; hardware, metal Small hardware; metal pipes; safes; ordinary metal products not included in other classes; ores.

Group 0603 Metal building materials, movable metal buildings (excluding construction hardware)

Metal door*060100, metal gate 060218, metal door panel 060219, metal door frame 060329, metal door Frame 060329, metal armored door 060450

2. Class 19 non-metallic building materials; non-metallic rigid pipes for construction; asphalt, asphalt; movable non-metallic buildings; non-metallic monuments.

1909 Non-metal building materials and components (excluding cement prefabricated components)

Non-metal folding doors 190022, non-metal doors*190069, non-metal doors 190153, non-metal door panels 190154, Non-metallic turnstile 190246, non-metallic flat plate for construction 190252, non-metallic armored door 190254, plastic steel doors and windows C190038,