Horsepower Ratings Roller Chains Table 1/4 inch No. 25

ANSI Hardware Design Guide and Reference

Horsepower Ratings for ANSI Roller Chains Table For Standard Single-Strand Roller Chain Number 25

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 ]

14-inch Pitch Standard Single-Strand Roller Chain — No. 25

No. of
Teeth
Small
Sprocket
Revolutions per Minute of Small Sprocket a
50
100
300
500
700
900
1200
1500
1800
2100
2500
3000
3500
Horsepower Rating
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
28
30
32
35
40
45
0.03
0.03
0.04
0.04
0.04
0.04
0.05
0.05
0.05
0.06
0.06
0.06
0.06
0.07
0.07
0.07
0.08
0.08
0.09
0.10
0.12
0.13
0.05
0.06
0.06
0.07
0.08
0.08
0.09
0.09
0.10
0.10
0.11
0.11
0.12
0.13
0.13
0.14
0.15
0.16
0.17
0.19
0.22
0.25
0.14
0.16
0.17
0.19
0.20
0.22
0.23
0.25
0.26
0.28
0.29
0.31
0.32
0.34
0.35
0.37
0.40
0.43
0.46
0.51
0.58
0.66
0.23
0.25
0.27
0.30
0.32
0.34
0.37
0.39
0.41
0.44
0.46
0.48
0.51
0.53
0.56
0.58
0.63
0.68
0.73
0.80
0.92
1.05
0.31
0.34
0.37
0.40
0.43
0.47
0.50
0.53
0.56
0.59
0.62
0.66
0.69
0.72
0.75
0.79
0.85
0.92
0.98

1.08
1.25
1.42
0.39
0.43
0.47
0.50
0.54
0.58
0.62
0.66
0.70
0.74
0.78
0.82
0.86
0.90
0.94
0.98

1.07
1.15
1.23
1.36
1.57
1.78
0.50
0.55
0.60
0.65
0.70
0.76
0.81
0.86
0.91
0.96

1.01
1.07
1.12
1.17
1.22
1.28
1.38
1.49
1.60
1.76
2.03
2.31
0.62
0.68
0.74
0.80
0.86
0.92

0.99
1.05
1.11
1.17
1.24
1.30
1.37
1.43
1.50
1.56
1.69
1.82
1.95
2.15
2.48
2.82
0.73
0.80
0.87

0.94
1.01
1.09
1.16
1.24
1.31
1.38
1.46
1.53
1.61
1.69
1.76
1.84
1.99
2.15
2.30
2.53
2.93
3.32
0.83
0.92
1.00
1.08
1.17
1.25
1.33
1.42
1.50
1.59
1.68
1.76
1.85
1.94
2.02
2.11
2.29
2.46
2.64
2.91
3.36
3.82
0.98
1.07
1.17
1.27
1.36
1.46
1.56
1.66
1.76
1.86
1.96
2.06
2.16
2.27
2.37
2.47
2.68
2.88
3.09
3.41
3.93
4.47
1.15
1.26
1.38
1.49
1.61
1.72
1.84
1.96
2.07
2.19
2.31
2.43
2.55
2.67
2.79
2.91
3.15
3.40
3.64
4.01
4.64
5.26
1.32
1.45
1.58
1.71
1.85
1.98
2.11
2.25
2.38
2.52
2.66
2.79
2.93
3.07
3.21
3.34
3.62
3.90
4.18
4.61
5.32
6.05
Type A
Type B
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