A-A-51154B
2.4 Class. The class to be furnished shall be as specified (see 7.3(f)). Unless otherwise specified (see 7.3(g)), the spacing of teeth along the circumference of the cutter head shall be selected from table III or IV for the diameter of the cutter head.
TABLE III. 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 - 11 |
12 - 15 |
4 - 5 |
3/16 |
9 - 11 |
12 - 14 |
15 - 20 |
4 - 8 |
1/4 |
10 - 13 |
14 - 16 |
17 - 21 |
4 - 9 |
5/16 |
11 - 16 |
17 - 20 |
21 - 26 |
5 - 10 |
3/8 |
12 - 17 |
18 - 22 |
23 - 30 |
5 - 11 |
1/2 |
14 - 20 |
21 - 26 |
27 - 35 |
7 - 13 |
5/8 |
17 - 22 |
23 - 29 |
30 - 40 |
9 - 16 |
3/4 |
18 - 24 |
25 - 32 |
33 - 44 |
10 - 17 |
1 |
20 - 27 |
28 - 41 |
42 - 55 |
14 - 19 |
TABLE IV. Type II 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 |
|
1/16 |
7 - 10 |
11 - 13 |
14 - 16 |
4 - 6 |
3/32 |
8 - 11 |
12 - 14 |
15 - 17 |
4 - 7 |
1/8 |
8 - 11 |
12 - 15 |
16 - 20 |
4 - 7 |
3/16 |
10 - 12 |
13 - 16 |
17 - 24 |
4 - 9 |
1/4 |
12 - 15 |
16 - 20 |
21 - 26 |
4 - 11 |
5/16 |
13 - 16 |
17 - 22 |
23 - 30 |
5 - 12 |
3/8 |
13 - 18 |
19 - 26 |
27 - 38 |
5 - 12 |
7/16 |
15 - 20 |
21 - 27 |
28 - 36 |
6 - 14 |
1/2 |
16 - 22 |
23 - 28 |
29 - 39 |
7 - 15 |
5/8 |
18 - 25 |
26 - 38 |
39 - 47 |
9 - 17 |
3/4 |
19 - 28 |
29 - 38 |
39 - 49 |
10 - 18 |
7/8 |
22 - 29 |
30 - 37 |
38 - 55 |
14 - 21 |
1 |
24 - 32 |
33 - 43 |
44 - 62 |
15 - 23 |
3
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