RS25 1 / 4 ” Pitch
ANSI
Pitch
Bushing Diameter
Width
Link Plate
Pin
U.S. TSUBAKI
No.
Between Inner Link Plates
Diameter
P
B
W
T
H
h
D
Chain No.
RS25
25
.250
.130
.125
.030
.230
.199
.0905
❈
Number
Transverse
Standard Minimum Average Maximum Approx.
Number
U.S. TSUBAKI
of
Pin
Pitch
Type
Ultimate
Tensile
Allowable
Weight lbs./ft.
of
Strands
of
Strength Strength
Load lbs.
Links
Pin
ANSI
lbs.
per
Standard
10 ft.
L 1 + L 2
L 1
L 2
C
Chain No.
lbs.
RS25
1 2
.339 .591
.150 .276
.189 .315
Riveted 780 1,050 Riveted 1,560 2,100
140 240
.094 .181
.252
480
RS25-2
Note: Only two-pitch offset links are available for RS25 and RS25-2. Refer to page A-23, "Selection for Slow Speed." ❈
Maximum Horsepower Ratings
Maximum Speed – Small Sprocket (rpm)
No. of Teeth Small Spkt.
50
100 300 500 700 900 1200 1500 1800 2100 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000 10,000
Lubrication System
A
B
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 0.44 0.51 0.58 0.64
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 0.55 0.56 0.63 0.66 0.71 0.78 0.90 1.03
0.31 0.34 0.37 0.40 0.43 0.47 0.48 0.53 0.56 0.59 0.60 0.64 0.67 0.72 0.75 0.76 0.83 0.90 0.98 1.06 1.22 1.39
0.39 0.43 0.47 0.50 0.54 0.58 0.60 0.64 0.68 0.72 0.76 0.80 0.84 0.90 0.94 0.98 1.05 1.13 1.21 1.33 1.53 1.74
0.50 0.55 0.60 0.65 0.68 0.74 0.79 0.84 0.89 0.94 0.99 1.05 1.10 1.14 1.19 1.25 1.35 1.46 1.56 1.72 1.98 2.25
0.60 0.66 0.72 0.78 0.84 0.90 0.97 1.02 1.09 1.15 1.21 1.27 1.34 1.39 1.46 1.53 1.65 1.78 1.90 2.11 2.43 2.76
0.71 0.78 0.84 0.94 0.99 1.06 1.14 1.21 1.29 1.35 1.42 1.50 1.57 1.65 1.72 1.80 1.94 2.09 2.25 2.48 2.86 3.25
0.83 0.90 0.98 1.06 1.14 1.22 1.30 1.38 1.48 1.56 1.64 1.73 1.81 1.89 1.98 2.07 2.24 2.41 2.59 2.84 3.29 3.73
0.95 1.05 1.14 1.23 1.33 1.43 1.53 1.62 1.72 1.82 1.92 2.01 2.12 2.21 2.32 2.41 2.61 2.82 3.02 3.33 3.85 4.37
1.13 1.23 1.34 1.46 1.57 1.69 1.80 1.92 2.02 2.15 2.27 2.37 2.49 2.61 2.72 2.84 3.08 3.33 3.57 3.93 4.53 5.15
1.29 1.42 1.54 1.68 1.81 1.93 2.07 2.20 2.33 2.47 2.60 2.74 2.87 3.00 3.14 3.27 3.54 3.82 4.09 4.51 5.20 5.91
1.38 1.57 1.74 1.89 2.04 2.19 2.33 2.48 2.63 2.78 2.92 3.08 3.23 3.38 3.54 3.69 4.00 4.30 4.61 5.08 5.87 6.66
1.16 1.32 1.49 1.66 1.84 2.03 2.22 2.42 2.62 2.83 3.05 3.27 3.50 3.73 3.93 4.10 4.44 4.79 5.14 5.65 6.53 7.42
0.99 1.12 1.27 1.42 1.57 1.73 1.90 2.07 2.24 2.42 2.60 2.79 2.98 3.18 3.38 3.59 4.01 4.45 4.90 5.60 6.85 8.15
0.86 0.97 1.10 1.23 1.36 1.50 1.64 1.79 1.94 2.10 2.26 2.42 2.59 2.76 2.93 3.11 3.47 3.85 4.25 4.86 5.93 7.08
0.75 0.86 0.96 1.08 1.20 1.32 1.44 1.57 1.70 1.84 1.98 2.12 2.27 2.42 2.57 2.73 3.05 3.38 3.73 4.26 5.21 6.21
0.67 0.76 0.86 0.96 1.06 1.17 1.28 1.39 1.51 1.63 1.76 1.88 2.01 2.15 2.28 2.42 2.70 3.00 3.30 3.78 4.62 5.51
0.60 0.68 0.77 0.86 0.95 1.05 1.14 1.25 1.35 1.46 1.57 1.69 1.80 1.92 2.04 2.17 2.42 2.68 2.96 3.38 4.13 4.93
0.54 0.61 0.69 0.77 0.86 0.94 1.03 1.12 1.22 1.32 1.42 1.52 1.62 1.73 1.84 1.95 2.18 2.42 2.67 3.05 3.73 4.45
0.49 0.56 0.63 0.70 0.78 0.86 0.94 1.02 1.11 1.20 1.29 1.38 1.47 1.57 1.67 1.77 1.98 2.20 2.42 2.77 3.38 4.04
0.45 0.51 0.57 0.64 0.71 0.78 0.86 0.93 1.01 1.09 1.17 1.26 1.35 1.44 1.53 1.62 1.81 2.01 2.21 2.53 3.09 3.69
0.41 0.47 0.53 0.59 0.65 0.72 0.79 0.86 0.93 1.00 1.08 1.16 1.24 1.32 1.40 1.49 1.66 1.84 2.03 2.32 2.83 3.38
0.35 0.40 0.45 0.50 0.56 0.61 0.67 0.73 0.79 0.86 0.92 0.99 1.06 1.12 1.20 1.27 1.42 1.57 1.73 1.98 2.42 2.89
C
Note: 1. Multiply the value given above by the multiple strand factor (page A-22, Table II) in order to obtain the transmission horsepower of multiple strand chain. 2. For lubrication systems A, B & C, refer to page A-77 for explanation. Please consult U.S. Tsubaki for use of horsepower ratings to the right of the boundary line. 3. Refer to page A-22, “Procedures for Selecting Roller Chain.” 4. Gray portion of Maximum Horsepower Ratings Table is Lubrication System C.
A-6
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