Modern drum design embraces extensive considerations beyond the scope of this publication. It should also be noted that drum grooves are now produced with a number of oversize dimensions and pitches applicable to certain service requirements.
| Nominal Rope Diameter | Nominal Rope Diameter | Groove Radius | Groove Radius | Groove Radius | Groove Radius |
|---|---|---|---|---|---|
| New | New | Worn | Worn | ||
| 1 inches | 2 mm | 3 inches | 4 mm | 5 inches | 6 mm |
| 1/4 | 6.4 | .135 | 3.43 | .129 | 3.28 |
| 5/16 | 8.0 | .167 | 4.24 | .160 | 4.06 |
| 3/8 | 9.5 | .201 | 5.11 | .190 | 4.83 |
| 7/16 | 11 | .234 | 5.94 | .220 | 5.59 |
| 1/2 | 13 | .271 | 6.88 | .256 | 6.50 |
| 9/16 | 14.5 | .303 | 7.70 | .288 | 7.32 |
| 5/8 | 16 | .334 | 8.48 | .320 | 8.13 |
| 3/4 | 19 | .401 | 10.19 | .380 | 9.65 |
| 7/8 | 22 | .468 | 11.89 | .440 | 11.18 |
| 1 | 26 | .543 | 13.79 | .513 | 13.03 |
| 1-1/8 | 29 | .605 | 15.37 | .577 | 14.66 |
| 1-1/4 | 32 | .669 | 16.99 | .639 | 16.23 |
| 1-3/8 | 35 | .736 | 18.69 | .699 | 17.75 |
| 1-1/2 | 38 | .803 | 20.40 | .759 | 19.28 |
| 1-5/8 | 42 | .876 | 22.25 | .833 | 21.16 |
| 1-3/4 | 45 | .939 | 23.85 | .897 | 22.78 |
| 1-7/8 | 48 | 1.003 | 25.48 | .959 | 24.36 |
| 2 | 52 | 1.085 | 27.56 | 1.025 | 26.04 |
| 2-1/8 | 54 | 1.137 | 28.88 | 1.079 | 27.41 |
| 2-1/4 | 58 | 1.210 | 30.73 | 1.153 | 29.29 |
| 2-3/8 | 60 | 1.271 | 32.28 | 1.199 | 30.45 |
| 2-1/2 | 64 | 1.338 | 33.99 | 1.279 | 32.49 |
| 2-5/8 | 67 | 1.404 | 35.66 | 1.339 | 34.01 |
| 2-3/4 | 71 | 1.481 | 37.62 | 1.409 | 35.79 |
| 2-7/8 | 74 | 1.544 | 39.22 | 1.473 | 37.41 |
| 3 | 77 | 1.607 | 40.82 | 1.538 | 39.07 |
| 3-1/8 | 80 | 1.664 | 42.27 | 1.598 | 40.59 |
| 3-1/4 | 83 | 1.731 | 43.97 | 1.658 | 42.11 |
| 3-3/8 | 87 | 1.807 | 45.90 | 1.730 | 43.94 |
| 3-1/2 | 90 | 1.869 | 47.47 | 1.794 | 45.57 |
| 3-3/4 | 96 | 1.997 | 50.72 | 1.918 | 48.72 |
| 4 | 103 | 2.139 | 54.33 | 2.050 | 52.07 |
| 4-1/4 | 109 | 2.264 | 57.51 | 2.178 | 55.32 |
| 4-1/2 | 115 | 2.396 | 60.86 | 2.298 | 58.37 |
| 4-3/4 | 122 | 2.534 | 64.36 | 2.434 | 61.82 |
| 5 | 128 | 2.663 | 67.64 | 2.557 | 64.95 |
| 5-1/4 | 135 | 2.804 | 71.22 | 2.691 | 68.35 |
| 5-1/2 | 141 | 2.929 | 74.40 | 2.817 | 71.55 |
| 5-3/4 | 148 | 3.074 | 78.08 | 2.947 | 74.85 |
| 6 | 154 | 3.198 | 81.23 | 3.075 | 78.11 |
* Values given are applicable to grooves in sheaves and drums; they are not generally suitable for pitch design since this may involve other factors.
Further, the dimensions do not apply to traction-type elevators; in this circumstance, drum-and sheave-groove tolerances should conform to the elevator manufacturer's specifications.
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