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Belt Fabrication Tolerances
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| convert to metric units | |||
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WIDTH
[in] |
FRACTIONS
[in] |
DECIMALS
[in] |
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£2 |
1/64 |
0.016 |
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>2
and £12 |
1/32 |
0.031 |
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>12
and £24 |
1/16 |
0.063 |
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>24
and £48 |
1/8 |
0.125 |
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>48 |
0.25% |
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| b | |||
LENGTHS [in] |
FRACTIONS
[in] |
DECIMALS
[in] |
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£12 |
1/16 |
0.063 |
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>12
and £48 |
1/8 |
0.125 |
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>48
and £100 |
3/16 |
0.188 |
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>100
and £240 |
5/16 |
0.313 |
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>240
and £600 |
1/2 |
0.50 |
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>600
and £1200 |
3/4 |
0.75 |
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>1200
and £2400 |
1
1/2 |
1.50 |
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>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. | |
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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. |
| 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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