Inch Dimensions of Weld Neck Flange Rating 1500 as per ASME B16.5

NPS	O Flange OD	Ttf Thickness	X Hub Dia	A Hub Dia	Y Length	B Bore Dia
1/2	4.75	0.88	1.50	0.84	2.38	BY P
3/4	5.12	1.00	1.75	1.05	2.75	BY P
1	5.88	1.12	2.06	1.32	2.88	BY P
1-1/4	6.25	1.12	2.50	1.66	2.88	BY P
1-1/2	7.00	1.25	2.75	1.90	3.25	BY P
2	8.50	1.50	4.12	2.38	4.00	BY P
2-1/2	9.62	1.62	4.88	2.88	4.12	BY P
3	10.50	1.88	5.25	3.50	4.62	BY P
4	12.25	2.12	6.38	4.50	4.88	BY P
5	14.75	2.88	7.75	5.56	6.12	BY P
6	15.50	3.25	9.00	6.63	6.75	BY P
8	19.00	3.62	11.50	8.63	8.38	BY P
10	23.00	4.25	14.50	10.75	10.00	BY P
12	26.50	4.88	17.75	12.75	11.12	BY P
14	29.50	5.25	19.50	14.00	11.75	BY P
16	32.50	5.75	21.75	16.00	12.25	BY P
18	36.00	6.38	23.50	18.00	12.88	BY P
20	38.75	7.00	25.25	20.00	14.00	BY P
24	46.00	8.00	30.00	24.00	16.00	BY P

Templates for drilling of bolt holes

NPS	BCD	BHD	BOLTS	BD	SBL RFY	SBL RJ	MBL RF
1/2	3.25	7/8	4	3/4	4.25	4.00	4.25
3/4	3.50	7/8	4	3/4	4.50	4.25	4.50
1	4.00	1	4	7/8	5.00	4.75	5.00
1-1/4	4.38	1	4	7/8	5.00	4.75	5.00
1-1/2	4.88	1-1/8	4	1	5.50	5.25	5.50
2	6.50	1	8	7/8	5.75	5.50	5.75
2-1/2	7.50	1-1/8	8	1	6.25	6.00	6.25
3	8.00	1-1/4	8	1-1/8	7.00	6.75	7.00
4	9.50	1	8	1-1/4	7.75	7.50	7.75
5	11.50	1-3/8	8	1-1/2	9.75	9.50	9.75
6	12.50	1-1/2	12	1-3/8	10.25	10.00	10.50
8	15.50	1-3/4	12	1-3/8	11.50	11.25	12.75
10	19.00	2	12	1-7/8	13.25	13.00	13.50
12	22.50	2-1/8	16	2	14.75	14.50	15.25
14	25.00	2-3/8	16	2-1/4	16.00	15.75	16.75
16	27.75	2-5/8	16	2-1/2	17.50	17.25	18.50
18	30.50	2-7/8	16	2-3/4	19.50	19.25	20.75
20	32.75	3-1/8	16	3	21.25	21.00	22.25
24	39.00	3-5/8	16	3-1/2	24.25	24.00	25.50

Dimensions are in inches.