Disposable files mainly used in medical dentistry, such as K files and H files, generally start with NO. 15 to 40, white, yellow, red, blue, green and black in turn. When expanding the root canal, the K file is generally pulled, and the H file can rotate slowly, not exceeding 180 degrees.

The specification of locksmith file refers to the length of file body.

The specification of special-shaped file and plastic file refers to the full length of the file.

The assembler files the body (the distance from the file tip to the file shoulder). In terms of length, there are several specifications: 100 ~ 150 mm, 200-300mm and 350-450 mm

The full length of special-shaped files and plastic files are specifications. The basic dimensions of a file mainly include width and thickness. For circular files, diameter.

Extended data:

Service rules

In order to prolong the service life of the file, the following rules must be observed:

1, it is forbidden to cut hard metal with a new file.

2, are not allowed to use a file to quench material.

3. Forgings and castings with hard skin or sticky sand must be ground off on a grinder before filing with a semi-sharp file.

4. Use one side of the new file first, and then use the other side after the surface is dulled.

5. When filing, be sure to use a wire brush to remove the debris on the file teeth.

6. Files shall not overlap or stack with other tools.

7. When using the file, the speed should not be too fast, otherwise it is easy to wear out prematurely.

8, file to avoid water, oil or other dirt.

9, fine file is not allowed to file soft metal.

10, don't use the assorted files too hard to avoid breaking them.

References:

Baidu Encyclopedia-Files