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.

 

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.

Special Note: Always Follow All Safety and Lock Out Tag Out Procedures

FINAL NOTE The above manual length calculation is based on typical applications without idlers.

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