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Belt Cross Section |
Maximum
Belt Loading Tension (lbs) |
Minimum
Pulley Pitch Diameter for 83A Cord (inches) |
| Profile |
inch |
mm |
83A
or 85A |
92A
or 95A |
M
< 250 |
M
=250 to 499 |
M
=500 to 1000 |
| Round |
1/16" |
1.5
mm |
.3 |
.4 |
.38" |
.44" |
.50" |
| Round |
.079" |
2
mm |
.4 |
.7 |
.44" |
.56" |
.63" |
| Round |
3/32" |
2.4
mm |
.6 |
.9 |
.57" |
.66" |
.75" |
| Round |
1/8" |
3
mm |
1.1 |
1.7 |
.75" |
.87" |
1.00" |
| Round |
5/32" |
4
mm |
1.7 |
2.6 |
.83" |
1.09" |
1.25" |
| Round |
3/16" |
5
mm |
2.5 |
3.8 |
1.00" |
1.31" |
1.50" |
| 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 |
1/2" |
12.5
mm |
17.8 |
26.7 |
3.00" |
3.50" |
4.00" |
| 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 |
17.7 |
26.5 |
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
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 |
.032"
x 1" |
|
2.7 |
4.1 |
.28" |
.30" |
.35" |
| Flat |
.040"
x 1" |
1
mm |
3.6 |
5.4 |
.32" |
.35" |
.40" |
| Flat |
.055"
x 1" |
|
5.0 |
7.5 |
.36" |
.40" |
.45" |
| Flat |
.063"
x 1" |
1.5
mm |
5.7 |
8.6 |
.38" |
.44" |
.50" |
| Flat |
.078"
x 1" |
2
mm |
7.1 |
10.6 |
.45" |
.55" |
.65" |
| Flat |
.094"
x 1" |
2.5
mm |
8.1 |
12.2 |
.50" |
.63" |
.75" |
| Flat |
.125"
x 1" |
3
mm |
11.3 |
17.0 |
.75" |
.87" |
1.00" |
| Flat |
.188"
x 1" |
5
mm |
17.0 |
25.5 |
1.00" |
1.31" |
1.50" |
| Flat |
.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).
For
92A durometer (hardness) belts, multiply minimum pulley diameters
by 1.3
*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.
Hollow
cord max stretch with single barb is 8%, double barb is 14%.
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| 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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