Modified Stock Gearing - Boston Gear

Roller Chain Drives
Horsepower Ratings for ANSI Roller Chains
See Horsepower Ratings, page 259
Small
Sprocket
HP RATINGS—STANDARD SINGLE * STRAND ROLLER CHAIN—NO. 100-1-1/4” PITCH
RPM
Teeth P.D.
10 20 30 50 75 100 125 150 200 250 300 400 500 600 900 1000 1200 1400
11 4.44 .81 1.51 2.18 3.45 4.97 6.44 7.88 9.28 12.0 14.7 17.3 22.4 27.4 32.3 27.5 23.4 17.8 14.2
13 5.22 .97 1.81 2.61 4.13 5.96 7.72 9.43 11.1 14.4 17.6 20.7 26.9 32.8 38.7 35.3 30.1 22.9 18.2
15 6.01 1.13 2.12 3.05 4.82 6.95 9.00 11.0 13.0 16.8 20.6 24.2 31.4 38.3 45.2 43.7 37.3 28.4 22.5
17 6.80 1.30 2.42 3.49 5.52 7.96 10.3 12.6 14.9 19.2 23.5 27.7 35.9 43.9 51.7 52.7 45.0 34.3 27.2
19 7.59 1.46 2.73 3.93 6.23 8.98 11.6 14.2 16.8 21.7 26.5 31.2 40.5 49.5 58.3 62.3 53.2 40.5 32.1
21 8.39 1.63 3.04 4.38 6.94 10.0 12.9 15.8 18.7 24.2 29.6 34.8 45.1 55.1 64.9 72.4 61.8 47.0 37.3
23 9.18 1.80 3.36 4.84 7.65 11.0 14.3 17.5 20.6 26.6 32.6 38.4 49.7 60.8 71.7 83.0 70.9 53.9 42.8
25 9.97 1.97 3.67 5.29 8.37 12.1 15.6 19.1 22.5 29.2 35.7 42.0 54.4 66.5 78.4 94.1 80.3 61.1 48.5
Lubrication # Type I Type II Type III Type IV
Small
Sprocket
HP RATINGS—STANDARD SINGLE * STRAND ROLLER CHAIN—NO. 120-1-1/2” PITCH
RPM
Teeth P.D.
10 20 30 50 75 100 125 150 200 250 300 400 500 600 700 800 900 1000 1200
11 5.324 1.37 2.56 3.68 5.82 8.40 10.9 13.3 15.6 20.3 24.8 29.2 37.8 46.3 54.5 46.3 37.9 31.8 27.1 20.6
13 6.268 1.64 3.06 4.41 6.97 10.1 13.0 15.9 18.7 24.3 29.7 35.0 45.3 55.4 65.3 59.5 48.7 40.8 34.9 26.5
15 7.215 1.91 3.57 5.14 8.13 11.7 15.2 18.6 21.9 28.3 34.7 40.8 52.9 64.6 76.1 73.8 60.4 50.6 43.2 32.9
17 8.164 2.19 4.09 5.88 9.31 13.4 17.4 21.3 25.0 32.4 39.7 46.7 60.5 74.0 87.2 89.0 72.8 61.0 52.1 39.6
19 9.114 2.47 4.61 6.64 10.5 15.2 19.6 24.0 28.2 36.5 44.8 52.7 68.2 83.4 98.3 105 86.1 72.1 61.6 46.8
21 10.064 2.75 5.13 7.39 11.7 16.9 21.8 26.7 31.4 40.7 49.8 58.7 76.0 93.0 110 122 100 83.8 71.6 54.4
Lubrication #Type I Type II Type IV Type IV
H
Small
Sprocket
HP RATINGS—STANDARD SINGLE * STRAND ROLLER CHAIN—NO. 140-1-3/4” PITCH
RPM
Teeth P.D.
10 20 30 50 75 100 125 150 200 250 300 400 500 600 700 800 900
11 6.211 2.13 3.97 5.72 9.06 13.1 16.9 20.7 24.4 31.5 38.6 45.5 58.9 72.0 65.8 52.4 42.9 35.9
13 7.312 2.55 4.74 6.83 10.9 15.6 20.3 24.7 29.2 37.8 46.2 54.4 70.5 86.2 84.6 67.3 55.1 46.2
15 8.417 2.98 5.56 8.01 12.7 18.3 23.7 28.9 34.1 44.1 54.0 63.6 82.4 101 105 83.4 68.3 57.2
17 9.523 3.41 6.36 9.16 14.5 20.9 27.1 33.1 39.0 50.5 61.7 72.8 94.2 115 126 100 82.4 69.1
19 10.632 3.84 7.17 10.3 16.0 23.5 30.5 37.3 44.0 57.0 70.0 82.1 106 130 149 119 97.4 81.6
21 11.742 4.28 7.98 11.5 18.2 26.2 34.0 41.5 49.0 63.4 77.6 91.4 118 145 171 138 113 94.8
Lubrication # Type I Type II Type III Type IV
Small
Sprocket
HP RATINGS—STANDARD SINGLE * STRAND ROLLER CHAIN—NO. 160-2” PITCH
RPM
Teeth P.D.
10 20 30 50 75 100 125 150 200 250 300 400 500 550 600
11 7.099 3.07 5.74 8.26 13.1 18.8 24.4 29.8 35.1 45.5 55.6 65.5 84.9 96.7 83.9 73.5
13 8.357 3.67 6.85 9.86 15.7 22.5 29.2 35.6 42.0 54.4 66.6 78.4 102 124 108 94.4
15 9.620 4.28 8.00 11.5 18.3 26.3 34.1 41.7 49.0 63.5 77.7 91.5 119 145 134 117
17 10.884 4.90 9.16 13.2 20.9 30.1 39.0 47.7 56.1 72.7 88.9 105 136 166 161 141
19 12.151 5.53 10.3 14.9 23.6 33.9 44.0 53.8 63.2 82.0 100 118 153 188 190 166
21 13.419 6.16 11.5 16.6 26.3 37.8 49.0 59.9 70.5 91.4 112 132 171 209 220 194
Lubrication #Type I Type II Type III Type IV
*See Page 259 for Multiple Strand Rating Factor.
#See Page 259 for Lubrication Details.
RATINGS FOR INTERMEDIATE NUMBERS OF TEETH OR RPM MAY BE OBTAINED BY INTERPOLATION.
262 Boston Gear 800-825-6544 P-1930-BG 04/10