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Your choices within the 'Services/Fabrication' section are:

   

nylon core
adhesive
 
methods

nylon core
splicing table

inch / mm

conveyor belt
joining data

inch
/ mm

belt
tolerances

inch / mm

order
  processing

terminology

 

Belt Fabrication Tolerances

VIS USA strives to hold tight tolerances for fabricated belts, particularly for small belts where accuracy is many times a decisive factor for the proper performance of a belt.  The following tables provide you with the guidelines we have in place in our workshop when fabricating belts for you.  

Please contact us if you need even closer tolerances. 

   


VIS STANDARD WIDTH TOLERANCES

convert to metric units

WIDTH [in]

FRACTIONS [in]

DECIMALS [in]

2

1/64

0.016

>2 and 12

1/32

0.031

>12 and 24

1/16

0.063

>24 and 48

1/8

0.125

>48

0.25%

  n/a


VIS STANDARD LENGTH TOLERANCES

b

LENGTHS [in]

FRACTIONS [in]

DECIMALS [in]

12

1/16

0.063

>12 and 48

1/8

0.125

>48 and 100

3/16

0.188

>100 and 240

5/16

0.313

>240 and 600

1/2

0.50

>600 and 1200

3/4

0.75

>1200 and 2400

1 1/2

1.50

>2400

0.07%

n/a 

b B
Note: Due to the humidity factor, an additional correction factor of 0.5% of the measured dimension is required for belts  constructed of polyamide materials.

For belts made with cleats and guides, an additional 0.15% of the belt length must be allowed on the negative side of the overall tolerance.


A Word about Thickness Tolerances

Although the thickness tolerance for different products varies depending on the overall thickness, material composition and surface structure of a belt, tolerances for rubber covered nylon core belts can be held considerably tighter than leather covered products.  Since leather is a natural product, it is more difficult to control the outcome of the end product's nominal thickness.  Usually, leather covered flat power transmission belts vary in thickness no more than 0.01in. for single sided leather belts, and 0.015in. for double sided leather products.  However, it does happen on rare occasion, that a leather covered product falls just outside this range and is not considered to be faulty.

 

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