270, rud a léiríonn an fad orlach, arna thiontú go fad méadrach ná 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");
- ciallaíonn 100 leithead an orlach, arna thiontú go leithead méadrach ná 1000.254=25.4mm;





