Have you ever asked yourselves what is Li, La, Ld…? You would find in this article a clear visualization of the different length standard for trapezoidal belts.

First of all please reminder that all length should measure under tension. Below are the descriptions of each length code standards where :

La is belt outside circle,

Lp is pitch line,

Li is inside circle,

Le is effective length,

Ld is datum length.

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