Sección	a		h
Sección	mm	pulg	mm	pulg
0	10	0,391	6	0,236
A	13	0,512	8	0,315
B	17	0,669	11	0,433
C	22	0,866	14	0,551
D	32	1,260	19	0,748
E	38	1,496	25	0,984

IRAM 113 113 y RMA

Length:
We call primitive length of a trapezoidal belt to the length measured in correspondence with its primitive diameter. The primitive diameter is that in which the speed of the belt and the speed of the striated pulley are theoretically equal.
The nominal primitive length of the belts is obtained from the table "nominal primitive length of the belts.
In order to obtain the external nominal length, the nominal primitive length must be added to the x value; and to obtain the internal nominal length, the value x1 must be subtracted to the nominal primitive length.

External development= nominal primitive length + x value
Internal development= nominal primitive length – x1 value.

	0	A	B	C	D	E
X mm	13	17	26	32	43	52
X1 mm	25	33	43	56	76	105

Longitud primitiva nominal de las Belts

Belt N°	"O"		"A"		"B"		"C"
Belt N°	pulg	mm	pulg	mm	pulg	mm	pulg	mm
15			16.3	414
16			17.3	439
17			18.3	465
18			19.3	490
19			20.3	516
20	19.5	495	21.3	541
21			22.3	566
22	21.5	546	23.3	592
23	22.5	571	24.3	617
24	23.5	596	25.3	643
25			26.3	668
26	25.5	647	27.3	693
27			28.3	719
28	27.5	698	29.3	744
29	28.5	724	30.3	770	30.8	782
30	29.5	749	31.3	795	31.8	808
31	30.5	774	32.3	820	32.8	833
32	31.5	800	33.3	846	33.8	859
33	32.5	825	34.3	871	34.8	884
34	33.5	851	35.3	887	35.8	909
35	34.5	876	36.3	922	36.8	935
36	35.5	901	37.3	947	37.8	960
37	36.5	927	38.3	973	38.8	986
38	37.5	953	39.3	998	39.8	1011
39	38.5	978	40.3	1024	40.8	1036
40	39.5	1003	41.3	1049	41.8	1062
41	40.5	1028	42.3	1074	42.8	1087
42	41.5	1054	43.3	1100	43.8	1113
43	42.5	1080	44.3	1125	44.8	1138
44	43.5	1104	45.3	1151	45.8	1163	46.9	1191
45			46.3	1176	46.8	1189	47.9	1217
46	45.5	1155	47.3	1201	47.8	1214	48.9	1242
47			48.3	1227	48.8	1240	49.9	1267
48	47.5	1206	49.3	1252	49.8	1265	50.9	1293
49			50.3	1278	50.8	1290	51.9	1318
50			51.3	1303	51.8	1316	52.9	1344

Belt N°	"O"		"A"		"B"		"C"
Belt N°	pulg	mm	pulg	mm	pulg	mm	pulg	mm
51			52.3	1328	52.8	1341	53.9	1369
52			53.3	1354	53.8	1367	54.9	1394
53			54.3	1379	54.8	1392	55.9	1420
54			55.3	1405	55.8	1417	56.9	1445
55			56.3	1430	56.8	1443	57.9	1471
56			57.3	1455	57.8	1468	58.9	1496
57			58.3	1481	58.8	1494	59.9	1521
58			59.3	1506	59.8	1519	60.9	1547
59			60.3	1532	60.8	1544	61.9	1572
60			61.3	1557	61.8	1570	62.9	1598
61			62.3	1582	62.8	1595	63.9	1623
62			63.3	1608	63.8	1621	64.9	1648
63			64.3	1633	64.8	1646	65.9	1674
64			65.3	1659	65.8	1671	66.9	1699
65			66.3	1684	66.8	1697	67.9	1725
66			67.3	1709	67.8	1722	68.9	1750
67			68.3	1735	68.8	1748	69.9	1775
68			69.3	1760	69.8	1773	70.9	1801
69			70.3	1786	70.8	1798	71.9	1826
70			71.3	1811	71.8	1824	72.9	1852
71			72.3	1836	72.8	1849	73.9	1877
72			73.3	1862	73.8	1875	74.9	1902
73			74.3	1887	74.8	1900	75.9	1928