Horsepower Ratings ANSI Roller Chain No 25 Table

No. of
Teeth		 Speed, Revolutions/min, Small Sprocket
50 100 300 365 500 700 900 1200
11 0.03 0.06 0.19 0.22 0.30 0.42 0.53 0.70
12 0.04 0.07 0.20 0.24 0.33 0.46 0.58 0.76
13 0.04 0.08 0.22 0.26 0.36 0.49 0.63 0.83
14 0.04 0.08 0.24 0.28 0.38 0.53 0.68 0.89
15 0.05 0.09 0.25 0.30 0.41 0.57 0.72 0.95
16 0.05 0.09 0.27 0.32 0.44 0.61 0.77 1.02
17 0.05 0.10 0.29 0.35 0.47 0.64 0.82 1.08
18 0.05 0.11 0.30 0.37 0.49 0.68 0.87 1.15
19 0.06 0.11 0.32 0.39 0.52 0.72 0.92 1.21
20 0.06 0.12 0.34 0.41 0.55 0.76 0.97 1.27
21 0.06 0.12 0.35 0.43 0.58 0.80 1.01 1.34
22 0.07 0.13 0.37 0.45 0.60 0.83 1.06 1.40
23 0.07 0.13 0.39 0.47 0.63 0.87 1.11 1.46
24 0.07 0.14 0.40 0.49 0.66 0.91 1.16 1.53
25 0.08 0.15 0.42 0.51 0.69 0.95 1.21 1.59
26 0.08 0.15 0.44 0.53 0.71 0.99 1.26 1.65
28 0.08 0.16 0.47 0.57 0.77 1.06 1.35 1.78
30 0.09 0.18 0.50 0.61 0.82 1.14 1.45  1.91
32 0.10 0.19 0.54 0.65 0.88 1.21 1.55 2.04
35 0.11 0.21 0.59 0.71 0.96 1.33 1.69 2.23
40 0.12 0.23 0.67 0.81 1.10 1.52 1.93 2.55
45 0.14 0.26 0.76 0.91 1.24 1.71 2.17 2.86
  Manual or drip lubrication Bath or disc lubrication

No. of
Teeth		 Speed, Revolutions/min, Small Sprocket
1500 1800 2100 2500 3000 3500 4000 4500
11 0.87 1.03 1.20 1.42 1.69 1.69 1.38 1.16
12 0.95 1.13 1.31 1.55 1.84 1.92 1.57 1.32
13 1.03 1.22 1.42 1.67 1.99 2.17 1.77 1.49
14 1.10 1.32 1.52 1.80 2.15 2.42 1.98 1.66
15 1.18 1.41 1.63 1.93 2.30 2.67 2.20 1.84
16 1.26 1.50 1.74 2.06 2.45 2.85 2.42 2.03
17 1.34 1.60 1.85 2.19 2.61 3.02 2.65 2.22
18 1.42 1.69 1.96 2.32 2.76 3.20 2.89 2.42
19 1.50 1.78 2.07 2.45 2.91 3.38 3.13 2.62
20 1.58 1.88 2.18 2.58 3.07 3.56 3.38 2.83
21 1.66 1.97 2.29 2.70 3.22 3.74 3.64 3.05
22 1.73 2.07 2.40 2.83 3.37 3.91 3.90 3.27
23 1.81 2.16 2.51 2.96 3.53 4.09 4.17 3.50
24 1.89 2.25 2.61 3.09 3.68 4.27 4.45 3.73
25 1.97 2.35 2.72 3.22 3.84 4.45 4.73 3.96
26 2.05 2.44 2.83 3.35 3.99 4.62 5.01 4.20
28 2.21 2.63 3.05 3.61 4.30 4.98 5.60 4.70
30 2.37 2.82 3.27 3.86 4.60 5.34 6.07 5.21
32 2.52 3.01 3.49 4.12 4.91 5.69 6.47 5.74
35 2.76 3.29 3.81 4.51 5.37 6.23 7.08 6.56
40 3.15 3.76 4.36 5.15 6.14 7.11 8.09 8.02
45 3.55 4.23 4.90 5.79 6.90 8.00 9.10 9.57
  Bath or disc lubrication (White Colored Cells) Oil stream lubrication (Yellow Colored Cells)

No. of
Teeth		 Speed, Revolutions/min, Small Sprocket
5000 5500 6000 7000 8000 9000 10000 11000 12000
11 0.99 0.86 0.75 0.60 0.49 0.41 0.35 0.30 0.27
12 1.12 0.97 0.86 0.68 0.56 0.47 0.40 0.34 0.30
13 1.27 1.10 0.96 0.77 0.63 0.53 0.45 0.39 0.34
14 1.42 1.23 1.08 0.86 0.70 0.59 0.50 0.43 0.38
15 1.57 1.36 1.20 0.95 0.78 0.65 0.56 0.48 0.42
16 1.73 1.50 1.32 1.05 0.86 0.72 0.61 0.53 0.47
17 1.90 1.64 1.44 1.14 0.94 0.79 0.67 0.58 0.51
18 2.07 1.79 1.57 1.25 1.02 0.86 0.73 0.63 0.56
19 2.24 1.94 1.70 1.35 1.11 0.93 0.79 0.69 0.00
20 2.42 2.10 1.84 1.46 1.20 1.00 0.86 0.74 0.00
21 2.60 2.26 1.98 1.57 1.29 1.08 0.92 0.00  
22 2.79 2.42 2.12 1.69 1.38 1.16 0.99 0.00  
23 2.98 2.59 2.27 1.80 1.47 1.24 1.04 0.00  
24 3.18 2.76 2.42 1.92 1.57 1.32 0.22 0.00  
25 3.38 2.93 2.57 2.04 1.67 1.40 0.00    
26 3.59 3.11 2.73 2.17 1.77 1.49 0.00    
28 4.01 3.47 3.05 2.42 1.98 0.00      
30 4.45 3.85 3.38 2.68 1.98 0.00      
32 4.90 4.25 3.73 2.96 0.35 0.00      
35 5.60 4.86 4.26 2.76 0.00        
40 6.85 5.93 4.91 0.00          
45 8.17 5.23 1.38 0.00          
  Bath or disc lubrication (White Colored Cells) Oil stream lubrication (Yellow Colored Cells)

The required horsepower rating of the chain is determined by the following equation:

Required hp, table rating = hp to be transmitted x service factor / multiple-strand factor

Supplements:

Reference:

  • ASME B29.1-2011 - Precision Power Transmission Roller Chains, Attachments, and Sprockets