How Can I Identify The Correct V-Belt Type When The Belt Is Broken Or No Longer Labeled?
Identifying a replacement belt is something you can do quite easily and quickly. The information below details the process.
STEP 1 - Identify The Cross Section
V-belt cross sections can be identified by their top width and depth dimensions. For example, a v-belt with a top width of 21/32” and a depth of 7/16” is a “B” belt. You can also use our Browning Belt Rule that includes a gauge to help easily identify belt type.
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Identification Chart
| Belt Type |
Top Width |
Depth |
| 3L | 3/8” | 7/32” |
| 4L | 1/2” | 5/16” |
| 5L | 21/32” | 3/8” |
| A | 1/2” | 5/16” |
| B | 21/32” | 7/16” |
| C | 7/8” | 17/32” |
| 3V | 3/8” | 5/16” |
| 5V | 5/8” | 17/32” |
| 8V | 1” | 29/32” |
STEP 2 - Determine If The V-belt Is Wrapped Or Notched Style
If the belt you have is “notched” add an “X” to the type. Example. If you identified a B belt type from Step 1, then you simply add an “X” to the description. You now have a “BX”.
STEP 3 - Determine V-belt Length
Using the Browning Belt Rule is the easiest way to identify belt length. However, if you are without a rule or the length exceeds the Belt Rule capacity, simply follow the formula below.
Calculation L=2C+1.57(D + d)
L = Pitch Length of Belt
C = Center Distance
D = Diameter of Large Sheave
d = Diameter of Small Sheave
Center Distance (C) = 28”
Diameter of Large Sheave (D) = 12”
Diameter of Small Sheave (d) = 6”
L=2(28)+1.57(12+6
L= 56+1.57(18)
L= 56+28.26
L= 84.26
Solution = 84” belt
Using the information from Step 1 and 2 we determined that we had a “B” section in the notched style “X” or combined a “BX” belt. Simply add the length from Step 3 and you have the required size. Your belt has been identified as a BX84.
Note: The above manual length calculation is based on typical applications without idlers.
Special Note: Always Follow All Safety and Lock Out Tag Out Procedures
