No. 25
SPROCKETS 101
1 / 4 ” PITCH
PLAIN BORE
Chain Data Size
25
Pitch
1/4˝ 1/8˝
Inside Width
Roller Diameter
0.130˝ 0.110˝
17. How to Order Code: The following decodes the model number for a given Tsubaki Stock Sprocket product. The following example should be used to decipher the characteristics and features associated with a given sprocket.
Nominal Tooth Width:
All dimensions in inches unless noted.
25 Plain Bore Sprocket Diameters
Type “A” Plain Bore
Type “B” Plain Bore
No. Teeth Outside Diameter Pitch Diameter
Caliper Diameter
Plain Bore
Wt. Lbs.
Plain Bore
MAX Bore* Hub Diameter
LTB
Style
Wt. Lbs.
9
0.837 0.919 1.002 1.083 1.167 1.246 1.326 1.407 1.487 1.568 1.648 1.729 1.809 1.889 1.969 2.049 2.129 2.209 2.369 2.529 2.688 2.928 3.008 3.327 3.725 3.964 4.442 4.920 5.876
0.731 0.809 0.870 0.996 1.045 1.124 1.203 1.282 1.361 1.440 1.519 1.598 1.678 1.757 1.836 1.915 1.995 2.074 2.233 2.392 2.551 2.789 2.889 3.187 3.584 3.823 4.300 4.777 5.732
0.591 0.679 0.748 0.836 0.907 0.994 1.066 1.152 1.225 1.310 1.383 1.468 1.543 1.627 1.702 1.785 1.861 1.944 2.103 2.262 2.421 2.656 2.739 3.057 3.452 3.693 4.170 4.647 5.602
NS NS NS NS NS NS
NS NS NS NS NS NS
0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.500 0.500 0.500 0.500 0.500 0.500
0.250 0.250 0.313 0.375 0.438 0.563 0.563 0.563 0.625 0.750 0.813 0.875 0.875 0.938 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.375 1.375 1.375 1.375 1.375 1.375
0.438 0.500 0.563 0.625 0.781 0.813 0.891 0.969 1.031 1.125 1.219 1.281 1.375 1.438 1.500 1.500 1.500 1.500 1.500 1.500 1.500 1.500 1.500 2.000 2.000 2.000 2.000 2.000 2.000
0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.750 0.750 0.750 0.750 0.750 0.750 0.750
S S S S S S S S S S S S S S S S S S S S S S S E E E E E E
0.03 0.03 0.04 0.06 0.07 0.08 0.10 0.12 0.14 0.16 0.19 0.25 0.28 0.31 0.32 0.33 0.34 0.35 0.36 0.38 0.40 0.46 0.50 0.53 0.56 0.56 1.00 1.10 1.30
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 28 30 32 35 36 40 45 48 54 60 72
A
35
B
TL
18
0.250 0.250 0.250 0.250 0.250 0.250 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.500 0.500 0.500 0.500 0.500 0.500
0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.060 0.060 0.080 0.080 0.090 0.100 0.120 0.140 0.160 0.180 0.200 0.250 0.320 0.380 0.540 0.740
Altered !!
Chain Pitch in Inches
Hub Type
TAPER-LOCK ®
Number of Teeth
18
22
26
19
23
28
A: Alteration Required
B: Hub Extension One Side
35: 3/8˝ Pitch
TAPER-LOCK ® hub
20
24
30
21
25
32
18. Altered Sprockets: Altered sprockets require a minor modification to the standard configuration to fulfill the requirements of the application at hand. Some examples of common alterations include: rebore to a different size than standard, different set screw location than standard, drilling of holes into sprocket plate for accessory mounting, non-standard keyway size, etc. A complete list of common alterations is available in the engineering section of this catalog. It should be noted that adding the prefix “A” is used only when an alteration is required. It is not necessary for standard products and only applies when a non-standard feature is required. 19. Fraction Legend for Hub Bore Size: The following table should be used to define the hub bore size associated with “Finished Bore” stock sprocket product. Note that a letter designator is used to represent a fractional dimension. For example: a 1B hub bore equates to a sprocket bore of 1.125” inside diameter.
* Dimensions shown allow for standard keyway with set screw at 90 degrees NS = Non Stock
STAINLESS STEEL PLAIN BORE
Chain Data Size
Altered Bore Sprocket
25SS 1/4˝ 1/8˝
Pitch
Inside Width
Roller Diameter
0.130˝ 0.110˝
Nominal Tooth Width:
Letter Designator
Fractional Size
Decimal Size
All dimensions in inches unless noted.
A B C D
1/16"
0.0625" 0.1250" 0.1875" 0.2500" 0.3125" 0.3750" 0.4375" 0.5000" 0.5625" 0.6250" 0.6875" 0.7500" 0.8125" 0.8750" 0.9375"
25 Stainless Steel Sprocket Diameters
Type “B” Plain Bore
1/8"
No. Teeth
Outside Diameter
Pitch Diameter
Caliper Diameter
Plain Bore
MAX Bore*
Hub Diameter
LTB
Wt. Lbs.
3/16"
9
0.837 0.919 1.002 1.083 1.167 1.246 1.326 1.407 1.487 1.568 1.648 1.729 1.809 1.889 1.969 2.049 2.129 2.209 2.369 2.529 3.008 3.327 3.725 4.920
0.731 0.809 0.870 0.966 1.045 1.124 1.203 1.282 1.361 1.440 1.519 1.598 1.678 1.757 1.836 1.915 1.995 2.074 2.233 2.392 2.869 3.187 3.584 4.777
0.591 0.679 0.748 0.836 0.907 0.994 1.066 1.152 1.225 1.310 1.383 1.468 1.543 1.627 1.702 1.785 1.861 1.944 2.103 2.262 2.739 3.057 3.452 4.647
0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.375 0.375 0.375 0.375 0.375 0.375 0.500 0.500 0.500
0.250 0.250 0.313 0.375 0.438 0.563 0.563 0.563 0.625 0.750 0.813 0.875 0.875 0.938 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.375 1.375 1.375
0.438 0.500 0.563 0.625 0.719 0.813 0.891 0.969 1.031 1.125 1.219 1.281 1.375 1.438 1.500 1.500 1.500 1.500 1.500 1.500 1.500 2.000 2.000 2.000
0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.625 0.750 0.750 0.750 0.750
0.03 0.03 0.03 0.06 0.07 0.08 0.10 0.12 0.14 0.16 0.19 0.25 0.28 0.31 0.32 0.33 0.34 0.35 0.36 0.38 0.50 0.53 0.56 1.10
1/4"
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 28 30 36 40 45 60
E F
5/16"
3/8"
G H
7/16"
1/2"
I
9/16"
J
5/8"
K L
11/16"
3/4"
M
13/16"
P R
7/8"
15/16"
* Dimensions shown allow for standard keyway with set screw at 90 degrees For more information on Sprockets see pages 132-137.
137
138
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