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  Round Cord Cross Sectional Sizes with Round Belt Minimum Lengths and Minimum Inside Diameters



Cross Section of Cord
Minimum Belt Lengths
Minimum Belt I.D.
For 83A Durometer Materials For 70A Durometer Material For 92A Durometer Materials For 83A Durometer Materials For 70A Durometer Material For 92A Durometer Materials
Inches MM Inches MM Inches MM Inches MM Inches MM Inches MM Inches MM
.062 - 3.75 95.25 3.75 95.25 3.75 95.25 1.132 28.744 1.132 28.744 1.132 28.744
.070 - 3.75 95.25 3.75 95.25 3.75 95.25 1.124 28.541 1.124 28.541 1.124 28.541
.078 2 3.75 95.25 3.75 95.25 3.75 95.25 1.116 28.338 1.116 28.338 1.116 28.338
.093 - 3.75 95.25 3.75 95.25 3.75 95.25 1.101 27.957 1.101 27.957 1.101 27.957
.100 2.5 3.75 95.25 3.75 95.25 3.75 95.25 1.094 27.779 1.094 27.779 1.094 27.779
.103 - 3.75 95.25 3.75 95.25 3.75 95.25 1.091 27.703 1.091 27.703 1.091 27.703
.118 3 3.75 95.25 3.75 95.25 3.75 95.25 1.076 27.332 1.076 27.332 1.076 27.332
.125 - 3.75 95.25 3.75 95.25 3.75 95.25 1.069 27.144 1.069 27.144 1.069 27.144
.139 - 3.75 95.25 3.75 95.25 3.75 95.25 1.055 26.788 1.055 26.788 1.055 26.788
.157 4 4.00 101.60 4.00 101.60 4.00 101.60 1.116 28.353 1.116 28.353 1.116 28.353
.187 4.75 4.50 114.30 4.5 114.30 4.5 114.30 1.245 31.633 1.245 31.633 1.245 31.633
.197 5 4.50 114.30 4.50 114.30 4.75 120.650 1.235 31.379 1.235 31.379 1.315 33.400
.210 - 4.75 120.65 4.75 120.65 4.75 120.65 1.302 33.070 1.302 33.070 1.302 33.070
.218 5.5 4.75 120.65 4.75 120.65 4.75 120.65 1.294 32.867 1.294 32.867 1.294 32.867
.236 6 5.00 127.00 5.00 127.00 5.00 127.00 1.356 34.431 1.356 34.431 1.356 34.431
.250 - 5.00 127.00 5.00 127.00 5.00 127.00 1.342 34.075 1.342 34.075 1.342 34.075
.274 7 5.50 139.70 5.50 139.70 5.75 146.05 1.477 37.508 1.477 37.508 1.556 39.530
.312 8 6.00 152.40 6.00 152.40 6.00 152.40 1.598 40.586 1.598 40.586 1.598 40.586
.375 - 7.50 190.50 7.50 190.50 7.50 190.50 2.012 51.113 2.012 51.113 2.012 51.113
.437 11 8.50 215.90 8.50 215.90 8.50 215.90 2.269 57.623 2.269 57.623 2.269 57.623
.500 - 9.25 234.95 9.25 234.95 9.50 241.30 2.444 6.087 2.444 6.087 2.524 64.108
.562 - 12.00 304.80 12.00 304.80 13.50 342.90 3.258 82.746 3.258 82.746 3.735 94.874



Minimum Pulley Diameter Recommendations

Belt Cross Section 83A 92A
.139" and smaller .375" .500"
.156" .500" .750"
.187" & .197"" 1.00" 1.250"
.218" 1.250" 1.500"
.236" 1.250" 1.750"
.250" 1.500" 2.250"
.312" 2.000" 3.000"
.500" 3.000" 4.000"


Ambient Operating Temperature Limits Are -10° to +150° F (-23.3° to +65.6° C)

Pyrathane® materials will operate in temperatures below -10° F (-23.3° C); however, if allowed to rest, they take a set which is difficult to overcome and may indeed cause fracturing upon start up.

For applications with an ambient temperature outside of the above range, Pyramid Inc. has other Pyrathane® compounds which may be more suitable than those listed here.

We also have materials available that are specifically designed for outdoor use or for environments with ultraviolet light exposure or for applications where static dissipation is desirable.
 
     
Pyramid Incorporated • 522 N 9th Ave E • PO Box 200 • Newton, IA 50208-0200