AFTMA Fly line weight ratings (grains)
| Weight | Grains | Tolerable Range |
| 1 | 60 | 54-66 |
| 2 | 80 | 74-86 |
| 3 | 100 | 94-106 |
| 4 | 120 | 114-126 |
| 5 | 140 | 134-146 |
| 6 | 160 | 152-168 |
| 7 | 185 | 177-193 |
| 8 | 210 | 202-218 |
| 9 | 240 | 230-250 |
| 10 | 280 | 270-290 |
| 11 | 330 | 318-342 |
| 12 | 380 | 368-392 |
| Grains are weighed over front 30 feet of line. | ||