DN	outside diameter D , in mm	diameter of bolt circle K , in mm	diameter of bolt hole L , in mm	number of bolts	bolts size	outside diameter of neck A , in mm	flange thickness C_4 , in mm	flange thickness C_2 , in mm	flange thickness C_3 , in mm	centre portion G_max , in mm	length H_2 , in mm	length H_3 , in mm	neck diameters N_1 , in mm	neck diameters N_3 , in mm	corner radius R_1 for flange type 11, in mm	corner radius R_1 for flange type 21, in mm
10	100	70	14	4	M12	17.2	20	20	20	-	45	6	32	40	4	4
15	105	75	14	4	M12	21.3	20	20	20	-	45	6	34	45	4	4
25	140	100	18	4	M16	33.7	24	24	24	-	58	8	52	61	4	4
40	170	125	22	4	M20	48.3	28	28	28	-	64	10	70	82	6	4
50	195	145	26	4	M24	60.3	30	30	30	-	75	10	90	96	6	4
65	220	170	26	8	M24	76.1	34	34	34	42	82	12	108	118	6	5
80	230	180	26	8	M24	88.9	36	36	36	55	86	12	120	128	8	5
100	265	210	30	8	M27	114.3	40	40	40	74	100	12	150	150	8	5
125	315	250	33	8	M30	139.7	44	44	44	98	115	14	180	184	8	6
150	355	290	33	12	M30	168.3	50	50	50	119	128	14	210	224	10	6
200	430	360	36	12	M33	219.1	62	60	60	168	140	16	278	288	10	8
250	515	430	42	12	M39	273	72	68	68	195	155	18	340	346	12	8
300	585	500	42	16	M39	323.9	84	78	78	235	175	18	400	414	12	10