Metric Dimensions of Weld Neck Flange Rating 600 as per ASME B16.5

NPS	O Flange OD	Ttf Thickness	X Hub Dia	A Hub Dia	Y Length	B Bore Dia
1/2	95	14.3	38	21.3	52	BY P
3/4	115	15.9	48	26.7	57	BY P
1	125	17.5	54	33.4	62	BY P
1-1/4	135	20.7	64	42.2	67	BY P
1-1/2	155	22.3	70	48.3	70	BY P
2	165	25.4	84	60.3	73	BY P
2-1/2	190	28.6	100	73	79	BY P
3	210	31.8	117	88.9	83	BY P
3-1/2	230	35	133	101.6	86	BY P
4	275	38.1	152	114.3	102	BY P
5	330	44.5	189	141.3	114	BY P
6	355	47.7	222	168.3	117	BY P
8	420	55.6	273	219.1	133	BY P
10	510	63.5	343	273	152	BY P
12	560	66.7	400	323.8	156	BY P
14	605	69.9	432	355.6	165	BY P
16	685	76.2	495	406.4	178	BY P
18	745	82.6	546	457	184	BY P
20	815	88.9	610	508	190	BY P
24	940	101.6	718	610	203	BY P

Templates for drilling of bolt holes

NPS	BCD	BHD	BOLTS	BD	SBL RFY	SBL RJ	MBL RF
1/2	66.7	5/8	4	1/2	75	70	75
3/4	82.6	3/4	4	5/8	90	85	90
1	88.9	3/4	4	5/8	90	85	90
1-1/4	98.4	3/4	4	5/8	95	90	95
1-1/2	114.3	7/8	4	3/4	110	100	110
2	127.0	3/4	8	5/8	110	100	110
2-1/2	149.2	7/8	8	3/4	120	115	120
3	168.3	7/8	8	3/4	125	120	125
3-1/2	184.2	1	8	7/8	140	135	140
4	215.9	1	8	7/8	145	140	145
5	266.7	1-1/8	8	1	165	160	165
6	292.1	1-1/8	12	1	170	165	170
8	349.2	1-1/4	12	1-1/8	190	185	195
10	431.8	1-3/8	16	1-1/4	215	210	215
12	489.0	1-3/8	20	1-1/4	220	215	220
14	527.0	1-1/2	20	1-3/8	235	230	235
16	603.2	1-5/8	20	1-1/2	255	250	255
18	654.0	1-3/4	20	1-5/8	275	265	275
20	723.9	1-3/4	24	1-5/8	285	280	290
24	838.2	2	24	1-7/8	330	325	335

Dimensions are in millimeters, except for diameters of bolts and bolt holes, which are in inch units.