The transition nipple also has three units of measurement: e.g. 50/63 mm x 1½".

It fits a 50 mm pipe or a 63 mm fitting.
On the other side, we have the external thread, which fits into an internal thread.

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Internal dimension/external dimension x thread

(d) Inner diameter left	(d1) Outer diameter left	(G) Thread diameter	L	(L1) Length of adhesive socket	(L2) Thread length	(H) Total length	(CH) Diameter (largest)	Weight
25 mm	32	1/2	19 mm	22 mm	15 mm	49 mm	36 mm	25 g
25 mm	32 mm	3/4"	19 mm	22 mm	16.3 mm	50 mm	36 mm	26 g
25 mm	32 mm	1"	19 mm	22 mm	19.1 mm	53 mm	36	27 g
32 mm	40 mm	1/2"	22 mm	26 mm	15 mm	53 mm	46 mm	35 g
32 mm	40 mm	3/4"	22 mm	26 mm	16.3 mm	54 mm	46 mm	43 g
32 mm	40 mm	1"	22 mm	26 mm	19.1 mm	57 mm	46	42 g
32 mm	40 mm	1 1/4"	22 mm	26 mm	21.4 mm	60 mm	46 mm	47 g
40 mm	50 mm	1"	26 mm	31 mm	19.1 mm	64 mm	55	70 g
40 mm	50 mm	1 1/4"	26 mm	31 mm	21.4 mm	67 mm	55	74 g
40 mm	50 mm	1 1/2"	26 mm	31 mm	21.4 mm	67 mm	55 mm	70 g
50 mm	63 mm	1 1/4"	32 mm	38 mm	21.4 mm	74 mm	65	116 g
50 mm	63 mm	1 1/2"	32 mm	38 mm	21.4 mm	74 mm	65 mm	113 g
50 mm	63 mm	2	32 mm	38 mm	25.7 mm	78 mm	65	119 g
63 mm	75 mm	1 1/2"	38 mm	44 mm	21.4 mm	84 mm	80 mm	182 g
63 mm	75 mm	2	38 mm	44 mm	25.7 mm	88 mm	80 mm	185 g
63 mm	75 mm	2 1/2"	38 mm	44 mm	30.2 mm	93 mm	80 mm	189 g
75 mm	90 mm	2	44 mm	51 mm	25.7 mm	95 mm	95 mm	279 g
75 mm	90 mm	2	44 mm	51 mm	33.5 mm	103 mm	95 mm	298 g
90 mm	110 mm	2 1/2"	51 mm	61 mm	30.5 mm	110 mm	115 mm	476 g
90 mm	110 mm	3	51 mm	61 mm	33.5 mm	113 mm	115 mm	483 g
90 mm	110 mm	4"	51 mm	61 mm	39.3 mm	118 mm	115	485 g