A-A-51171B
2.3 Size. The size to be furnished shall be as specified in table I (see 7.3(d)). If a rotary file is to be furnished with a shank diameter or cutter head diameter and length different from those listed in table I, the shank diameter and cutter head diameter and head length shall be specified in the acquisition order (see 7.3(e)).
TABLE I. Type I and II, rotary files, sizes, and characteristics.
|
Size |
Shank diameter (inch) |
Cutter head diameter (inch) |
1 |
1/8 |
1/8 |
2 |
1/4 |
1/4 |
3 |
1/4 |
3/8 |
4 |
1/4 |
1/2 |
5 |
1/4 |
5/8 |
6 |
1/4 |
3/4 |
7 |
1/4 |
1 |
2.4 Class. The class of rotary file to be furnished shall be as listed in table II for type I and table III for type II files (see 7.3(f)).
TABLE II. Type I, rotary files, number of teeth per circumference.
Cutting head diameter (inch) |
Teeth per circumference |
|||
Class A coarse cut |
Class B medium cut |
Class C fine cut |
Class D extra coarse cut |
|
1/8 |
6-8 |
9-15 |
16-20 |
4-5 |
1/4 |
10-13 |
14-16 |
17-21 |
4-9 |
3/8 |
12-17 |
18-22 |
23-30 |
6-11 |
1/2 |
14-20 |
21-26 |
27-35 |
8-13 |
5/8 |
17-22 |
23-29 |
30-40 |
10-16 |
3/4 |
18-24 |
25-32 |
33-44 |
12-17 |
1 |
20-27 |
28-41 |
42-55 |
13-19 |
2
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