SPROCKET HARDENING
SPROCKET TOOTH DIMENSIONS
All U.S. Tsubaki sprockets are made using high quality 1045 steel. Since chain loadings are evenly distributed over all engaged sprocket teeth, tooth breakage or distortion is not normally a problem. It is seldom necessary to use special high-strength material. The hardening process of small diameter, small pitch sprockets is usually a one- step procedure; heat treatment through electrical induction. Large diameter, large pitch sprockets can usually be directly flame hardened. These methods are used to provide a high hardness at the wear areas, plus provide the ability of the tooth to absorb shock loads. This is accomplished by hardening only the wear area of each tooth while maintaining a ductile tooth core which is tough and resilient. The hubs and bores remain soft to permit reworking. The general guidelines for stock sprockets are:
Hardness Conversion Table
Sprocket Tooth Dimensions — Standard
All dimensions are in inches unless otherwise indicated.
Brinell No. 3000 KG. Load
Rockwell “C” 150 KG. Load
A 60 KG.
Shore Model C
Tensile Str. Lbs. per Sq. In.
Double and Triple Strand
Chain Data for All Sprockets
For 4 or more Strands
Machining Tolerance on “t” and “M”
Single Strand t1
10 11 13 14 15 16 17 18 20 21 22 23 24 25 26 28 29 30 31 32 33 34 35 36 37 38 40 41 42 44 45 46 47 49 50 52 53 55 57 58 60 62 64 66 68 70
27 28 28 29 30 30 31 31 32 33 34 35 36 37 37 38 39 40 42 43 44 45 46 48 49 51 52 54 55 57 59 61 63 65 67 70 72 75 78 81 84 87 91 95
183 187 192 197 202 207 212 217 223 229 235 241 248 255 262 269 277 285 293 302 311 321 331 341 352 363 375 388 401 415 429 444 461 477 495 514 534 555 578 601 627 653 682 712 745 780
91,000 93,000 95,000 97,000 99,000 101,000 104,000 107,000 110,000 113,000 116,000 119,000 122,000 125,000 128,000 131,000 134,000 138,000 142,000 146,000 150,000 155,000 160,000 165,000 170,000 176,000 182,000 189,000 196,000 204,000 212,000 220,000 229,000 238,000 247,000 256,000 266,000 276,000 287,000 298,000 311,000 324,000 337,000 352,000 368,000 384,000
Roller Width W
Pitch P
Roller Diam.
ANSI
t 2
M 2
M 3
t 4
M 2
M 3
M 4
M 5
M 6
M 8
K
STANDARD SERIES CHAIN SPROCKETS .107 .359 .611 .096 .348 .600
25 35 40 50 60 80
1/4 3/8 1/2 5/8 3/4
1/8
.130 .200 .312 .400 .469 .625 .750 .875
.110
.852 1.140 1.356 1.860 .252 —.007
3/16 5/16
.168 .162 .561 .960 .149 .548 .947 1.346 1.745 2.144 2.942 .399 —.008 .284 .275 .841 1.407 .256 .822 1.388 1.954 2.520 3.086 4.218 .566 —.009 .343 .332 1.045 1.758 .311 1.024 1.737 2.450 3.163 3.876 5.302 .713 —.010 .459 .444 1.341 2.238 .418 1.315 2.212 3.109 4.006 4.903 6.697 .897 —.011 .575 .557 1.710 2.863 .526 1.679 2.832 3.985 5.138 6.291 8.597 1.153 —.012 .692 .669 2.077 3.485 .633 2.041 3.449 4.857 6.265 7.673 10.489 1.408 —.014 .924 .894 2.683 4.472 .848 2.637 4.426 6.215 8.004 9.793 13.371 1.789 —.016 .924 .894 2.818 4.742 .848 2.772 4.696 6.620 8.544 10.468 14.316 1.924 —.016
60.5 61.0 61.5 62.0 62.5 63.0 63.5 64.5 65.0 65.5 66.0 66.5 67.0 67.5 68.0 68.5 69.0 69.5 70.5 71.0 71.5 72.5 73.0 73.5 74.0 75.5 76.0 77.0 77.5 78.5 79.5 80.0 81.0 82.5 83.5 84.5 85.5 86.5
3/8 1/2 5/8 3/4
1
100 120 140 160
1 1/4 1 1/2 1 3/4
1 1
1.000
2 1 1/4 1.125 1.156 1.119 3.424 5.729 1.063 3.368 5.673 7.978 10.283 12.588 17.198 2.305 —.019 180 2 1/4 113/32 1.406 1.301 1.259 3.851 6.443 1.197 3.789 6.381 8.973 11.565 14.157 19.341 2.592 —.020 200 2 1/2 1 1/2 1.562 1.389 1.344 4.161 6.978 1.278 4.095 6.912 9.729 12.546 15.363 20.997 2.817 —.021 240 3 1 7/8 1.875 1.738 1.682 5.140 8.598 1.601 5.059 8.517 11.975 15.433 18.891 — 3.458 —.025
Rockwell Scales
Size
A C 68-76 35-50
35-80 Pitch
100-240 Pitch
63-70 25-40
Thru Hardened Teeth Case hardened on wear surfaces with tough resilient core
100 106
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