Belt Cross Section Calculator
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| Round |
1/16" |
1.6 mm |
0.3 |
0.4 |
0.38" |
0.44" |
0.50" |
| Round |
0.079" |
2 mm |
0.4 |
0.7 |
0.44" |
0.56" |
0.63" |
| Round |
3/32" |
2.4 mm |
0.6 |
0.9 |
0.57" |
0.66" |
0.75" |
| Round |
0.103" |
2.6 mm |
0.7 |
1.1 |
0.63" |
0.72" |
0.82" |
| Round |
1/8" |
3 mm |
1.1 |
1.7 |
0.75" |
0.87" |
1.00" |
| Round |
5/32" |
4 mm |
1.7 |
2.6 |
0.83" |
1.09" |
1.25" |
| Round |
3/16" |
5 mm |
2.5 |
3.8 |
1.00" |
1.31" |
1.50" |
| Round |
0.210" |
5.3 mm |
2.9 |
4.7 |
1.25" |
1.45" |
1.67" |
| Round |
7/32" |
5.6 mm |
3.4 |
5.1 |
1.31" |
1.52" |
1.75" |
| Round |
0.236" |
6 mm |
3.9 |
5.9 |
1.41" |
1.64" |
1.88" |
| Round |
1/4" |
6.3 mm |
4.4 |
6.7 |
1.50" |
1.75" |
2.00" |
| Round |
5/16" |
8 mm |
6.9 |
10.4 |
1.87" |
2.19" |
2.50" |
| Round |
3/8" |
9.5 mm |
10.0 |
15.0 |
2.25" |
2.62" |
3.00" |
| Round |
7/16" |
11 mm |
13.6 |
20.4 |
2.63" |
3.06" |
3.50" |
| Round |
0.472" |
12 mm |
15.75 |
23.6 |
2.83" |
3.30" |
3.77" |
| Round |
1/2" |
12.5 mm |
17.8 |
26.7 |
3.00" |
3.50" |
4.00" |
| Round |
9/16" |
14 mm |
22.5 |
33.9 |
3.38" |
3.88" |
4.38" |
| Round |
5/8" |
16 mm |
31.2 |
48.6 |
4.00" |
4.50" |
5.00" |
| Round |
3/4" |
19 mm |
44.9 |
67.3 |
4.75" |
5.38" |
6.00" |
| V-Belt |
Y Sec. |
6 mm |
2.6 |
3.9 |
0.94" ** |
1.25" ** |
1.45" ** |
| V-Belt |
M Sec. |
8 mm |
4.3 |
6.5 |
1.35" ** |
1.56" ** |
1.88" ** |
| V-Belt |
3L Sec. |
10 mm |
6.1 |
9.1 |
1.62" ** |
1.87" ** |
2.25" ** |
| V-Belt |
3L Crown Top |
14 mm |
8.8 |
13.2 |
1.62" ** |
1.87" ** |
2.25" ** |
| V-Belt |
3L Twin |
24 mm |
12.5 |
18.8 |
1.62" ** |
1.87" ** |
2.25" ** |
| V-Belt |
A Sec. |
13 mm |
11.4 |
17.1 |
2.25" ** |
2.62" ** |
3.00" ** |
| V-Belt |
A Sec. Wide |
13 mm |
12.0 |
N/A |
2.50" ** |
2.88" ** |
3.25" ** |
| V-Belt |
A Twin |
30 mm |
23.4 |
35.1 |
2.25" ** |
2.62" ** |
3.00" ** |
| V-Belt |
B Sec. |
17 mm |
19.8 |
29.7 |
3.00" ** |
3.50" ** |
4.00" ** |
| V-Belt |
C Sec. |
22 mm |
33.5 |
50.2 |
3.75" ** |
4.25" ** |
4.75" ** |
| V-Belt |
D Sec. |
38 mm |
73.5 |
110.2 |
6.00" ** |
7.00" ** |
8.00" ** |
| Flat |
0.032" x 1" |
0.8 mm |
2.7 |
4.1 |
0.28" |
0.30" |
0.35" |
| Flat |
0.040" x 1" |
1 mm |
3.6 |
5.4 |
0.32" |
0.35" |
0.40" |
| Flat |
0.055" x 1" |
1.4 mm |
5.0 |
7.5 |
0.36" |
0.40" |
0.45" |
| Flat |
0.063" x 1" |
1.6 mm |
5.7 |
8.6 |
0.38" |
0.44" |
0.50" |
| Flat |
0.078" x 1" |
2 mm |
7.1 |
10.6 |
0.45" |
0.55" |
0.65" |
| Flat |
0.094" x 1" |
2.4 mm |
8.1 |
12.2 |
0.50" |
0.63" |
0.75" |
| Flat |
0.125" x 1" |
3.2 mm |
11.3 |
17.0 |
0.75" |
0.87" |
1.00" |
| Flat |
0.188" x 1" |
4.8 mm |
17.0 |
25.5 |
1.00" |
1.31" |
1.50" |
| Flat |
0.250" x 1" |
6.3 mm |
22.7 |
34.1 |
1.75" |
2.00" |
2.37" |
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WARNING Using a pulley substantially smaller than the Minimum Pulley Diameter will cause premature belt failure due to excessive internal heating and severe shear forces on the belt joint. Such abuse is called VMPD (Violation of Minimum Pulley Diameter).
*Pulley Pitch Diameter = The diameter as measured from the center of the belt's cross-section through the center of the pulley to the center of the belt's cross-section. This is equivalent to the root diameter of the pulley plus the belt thickness (for belts that sit on the bottom of the groove). V-Belts, which are wedged between pulley flanges, may not sit on the bottom of the groove.
**When back bending V-Belts, multiply minimum pulley diameters by 1.5
***The minimum pulley diameters in our chart are conservative for optimum belt life.
You can violate them by 10% (i.e. diameters 10% smaller), but not more than 20%.
For 95A durometer (hardness) belts, multiply minimum pulley diameters by 1.7
For 92A durometer (hardness) belts, multiply minimum pulley diameters by 1.6
For 90A durometer (hardness) belts, multiply minimum pulley diameters by 1.5
For 88A durometer (hardness) belts, multiply minimum pulley diameters by 1.4
For 70A durometer (hardness) belts, multiply minimum pulley diameters by 0.7
For 60A durometer (hardness) belts, multiply minimum pulley diameters by 0.6
Hollow cord max stretch with single barb is 8%; double barb is 14%.
IMPORTANT!
Before making a substantial purchase, users should test a number of prototype belts under the same conditions in which the belts will be expected to operate.
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