Horsepower Ratings ANSI Roller Chain No 120 Table

ANSI Hardware Design Guide and Reference

Horsepower Ratings for ANSI Roller Chains Table For 1-1/2 " Pitch Standard Single Strand Roller Chain No. 120

To determine the horsepower requirements for Roller Chains the following must be taken into consideration:

  • Service factors,
  • Lubrication Service Factors,
  • Multiple Strand Factors: For two strands, the multiple strand factor is 1.7; for three strands, it is 2.5; and for four strands, it is 3.3.,
  • Lubrication: Required type of lubrication is indicated at the bottom of each roller chain size section of the table,
  • Type A: Manual or Drip Lubrication, Type B: Bath or Disc Lubrication, Type C: Oil Stream Lubrication.

To find the required horsepower table rating, use the following formula:

HP Required = [ HP to be Transmitted ] x [ Service Factor ] / [ Multiple Strand Factor ]

No.
of
Teeth
Small
Sprocket
1 - 1/2" Pitch Standard Single Strand Roller Chain No. 120
Revolutions per Minute - Small Sprocket
10
25
50
100
150
200
300
400
500
600
700
800
900
Horsepower Rating
11
1.37
3.12
5.83
10.9
15.7
20.3
29.2
37.9
46.3
54.6
46.3
37.9
31.8
12
1.50
3.43
6.40
11.9
17.2
22.3
32.1
41.6
50.9
59.9
52.8
43.2
36.2
13
1.64
3.74
6.98
13.0
18.8
24.3
35.0
45.4
55.5
65.3
59.5
48.7
40.8
14
1.78
4.05
7.56
14.1
20.3
26.3
37.9
49.1
60.1
70.8
66.5
54.4
45.6
15
1.91
4.37
8.15
15.2
21.9
28.4
40.9
53.0
64.7
76.3
73.8
60.4
50.6
16
2.05
4.68
8.74
16.3
23.5
30.4
43.8
56.8
69.4
81.8
81.3
66.5
55.7
17
2.19
5.00
9.33
17.4
25.1
32.5
46.8
60.6
74.1
87.3
89.0
72.8
61.0
18
2.33
5.32
9.92
18.5
26.7
34.6
49.8
64.5
78.8
92.9
97.0
79.4
66.5
19
2.47
5.64
10.5
19.6
28.3
36.6
52.8
68.4
83.6
98.5
105
86.1
72.1
20
2.61
5.96
11.1
20.7
29.9
38.7
55.8
72.2
88.3
104
114
92.9
77.9
21
2.75
6.28
11.7
21.9
31.5
40.8
58.8
76.2
93.1
110
122
100
83.8
22
2.90
6.60
12.3
23.0
33.1
42.9
61.8
80.1
97.9
115
131
107
89.9
23
3.04
6.93
12.9
24.1
34.8
45.0
64.9
84.0
103
121
139
115
96.1
24
3.18
7.25
13.5
25.3
36.4
47.1
67.9
88.0
108
127
146
122
102
25
3.32
7.58
14.1
26.4
38.0
49.3
71.0
91.9
112
132
152
130
109
26
3.47
7.91
14.8
27.5
39.7
51.4
74.0
95.9
117
138
159
138
115
28
3.76
8.57
16.0
29.8
43.0
55.7
80.2
104
127
150
172
154
129
30
4.05
9.23
17.2
32.1
46.3
60.0
86.4
112
137
161
185
171
143
32
4.34
9.90
18.5
34.5
49.6
64.3
92.6
120
147
173
199
188
158
35
4.78
10.9
20.3
38.0
54.7
70.9
102
132
162
190
219
215
180
40
5.52
12.6
23.5
43.9
63.2
81.8
118
153
187
220
253
45
6.27
14.3
26.7
49.8
71.7
92.9
134
173
212
250
287
Type A
Type B
Type C
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