Lub sij hawm siv txoj siv sia 700 H 100 txhais li cas

270, qhia qhov ntev nti, hloov mus rau metric ntev yog 2702.54=685.8mm;

- H, is the model of the timing belt, indicating that the pitch is 12.7mm (the example of the opening of teeth and teeth is called "pitch");

- 100 txhais tau tias lub nti dav, hloov mus rau metric dav yog 1000.254=25.4mm;