| Groove Radius | Groove Radius | Groove Radius | Groove Radius | ||
| Nominal Rope Diameter |
Nominal Rope Diameter |
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.
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.