A-A-51146C
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 specified.
TABLE III. Number of teeth per circumference, type I rotary files.
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 |
4 - 10 |
3/8 |
12 - 17 |
18 - 22 |
23 - 30 |
5 - 11 |
7/16 |
13 - 18 |
19 - 24 |
25 - 31 |
6 - 12 |
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 |
7/8 |
19 - 25 |
26 - 33 |
34 - 45 |
14 - 18 |
1 |
20 - 27 |
28 - 41 |
42 - 55 |
15 - 19 |
TABLE IV. Number of teeth per circumference, type II rotary files.
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 |
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 |
4 - 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 |
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