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Minimum Sheave and Drum Dimensions

A technical drawing of sheave and drum dimensions by Paducah Rigging

  • Description
  • Specifications

Description

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.

Specifications

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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