Belt No. (inch)
code	Internal length(mm)	code	Internal length(mm)	code	Internal length(mm)	code	Internal length(mm)	code	Internal length(mm)	code	Internal length(mm)	code	Internal length(mm)
Z 16	410	Z 22 1/4	565	Z 27	685	Z 32	815	Z 36 3/4	935	Z 42	1070	Z 50	1270
Z 17 1/4	440	Z 22 1/2	575	Z 27 1/2	700	Z 32 1/2	825	Z 37	945	Z 42 1/2	1080	Z 50 1/2	1285
Z 18	460	Z 23	585	Z 28	710	Z 33	840	Z 37 1/2	950	Z 43	1090	Z 51	1300
Z 19	480	Z 23 1/2	600	Z 28 1/2	725	Z 33 1/2	850	Z 38	965	Z 43 1/4	1100	Z 52	1320
Z 19 1/2	500	Z 23 3/4	605	Z 29	735	Z 34	865	Z 38 1/4	975	Z 44	1120	Z 53	1345
Z 20	508	Z 24	610	Z 29 1/2	750	Z 34 1/4	870	Z 39	1000	Z 45	1145	Z 54	1371
Z 20 1/2	520	Z 24 3/4	630	Z 30	765	Z 34 1/2	875	Z 40	1016	Z 46	1180	Z 55	1400
Z 21 1/4	540	Z 25	635	Z 30 1/2	775	Z 35	890	Z 40 1/2	1030	Z 47	1194	Z 56	1422
Z 21 1/2	545	Z 25 1/2	650	Z 30 3/4	785	Z 35 1/2	900	Z 41	1040	Z 47 3/4	1215	Z 57	1450
Z 21 3/4	555	Z 26	660	Z 31	787	Z 36	915	Z 41 1/2	1050	Z 48	1225	Z 59	1500
Z 22	560	Z 26 1/2	670	Z 31 1/2	800	Z 36 1/2	925	Z 41 3/4	1060	Z 49	1245