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| GRADE | APPROXIMATE SURF. FT. | % RELATIVE SPEED |
| PER MIN. | BASED ON C-1212 as 100% |
| 302 |
70 |
40 |
| 302/304 "B" |
55 |
28 |
| 303 |
150 |
75 |
| 304 |
70 |
40 |
| 304L |
70 |
40 |
| 309 |
60 |
36 |
| 310 |
60 |
36 |
| 316 |
60 |
36 |
| 316"B" |
50 |
22 |
| 316 L |
60 |
36 |
| 317-317 L |
60 |
36 |
| 321 |
60 |
36 |
| 330 |
45 |
20 |
| 347 |
60 |
36 |
| 403 |
95 |
54 |
| 410 |
95 |
54 |
| 416 Ann |
150 |
75 |
| 416 H.T. |
85 |
50 |
| 418 (Greek Ascoloy) |
96 |
50 |
| 420 |
85 |
50 |
| 420F |
125 |
68 |
| 422 |
85 |
50 |
| 430 |
110 |
66 |
| 430F |
150 |
75 |
| 431 |
80 |
48 |
| 440 A |
65 |
40 |
| 440 C |
65 |
40 |
| 440 F Se |
80 |
48 |
| 446 |
60 |
36 |
| Custom 455(12-9-2) |
55 |
28 |
| PH-13-8 MO |
60 |
36 |
| 15-5 PH |
75 |
45 |
| 17-4 PH |
75 |
45 |
| 17-4 PH "H1150" |
85 |
50 |
| 17-7 PH |
75 |
45 |
| AM 355 |
72 |
42 |
| Nitronic 40 |
50 |
22 |
| Nitronic 50 |
50 |
22 |
| Nitronic 60 |
50 |
22 |
|
