ASME/ANSI B16.5 Class 900 Flange Dimensions & Standards

CLASS 900			FLANGE THICKNESS			LTB				DRILLING DATA
NOMINAL PIPE SIZE		FLANGE OUTSIDE DIAMETER	THICKNESS OF FLANGE MIN	BOSSED LENGTH	WELD NECK LENGTH	LAP JOINT LENGTH	LONG WELD NECK LENGTH	PITCH CIRCLE DIAMETER	BOLT HOLE DIAMETER	NUMBER OF BOLT HOLES	NOMINAL PIPE SIZE
MM	INCH	OD	T & T1	L	L1	L2	L3	PCD	H	#	MM	INCH
15	1/2	121	22.5	39.0	67	32	229	82.6	22	4	15	1/2
20	3/4	130	25.5	42.0	77	35	229	88.9	22	4	20	3/4
25	1	149	29	48.0	80	41	229	101.6	26	4	25	1
32	1 1/4	159	29	48.0	80	41	229	111.1	26	4	32	1 1/4
40	1 1/2	178	32	51.0	90	44	229	123.8	29	4	40	1 1/2
50	2	216	38.5	64.0	109	57	229	165.1	25	8	50	2
65	2 1/2	244	41.5	71.0	112	64	229	190.5	29	8	65	2 1/2
80	3	240	38	61.0	109	54	229	190.5	26	8	80	3
100	4	290	45	77.0	121	70	229	235.0	32	8	100	4
125	5	350	50.8	86.0	134	79	305	279.4	35	8	125	5
150	6	380	56	93.0	147	86	305	317.5	32	12	150	6
200	8	470	64	109.0	169	114	305	393.7	38	12	200	8
250	10	545	70	115.0	191	127	305	469.9	38	16	250	10
300	12	610	79	124.0	207	143	305	533.4	38	20	300	12
350	14	640	85.8	137.0	220	156	305	558.8	42	20	350	14
400	16	705	88.9	140.0	223	165	305	616.0	45	20	400	16
450	18	785	102	159.0	236	190	305	685.8	51	20	450	18
500	20	855	108	166.0	255	210	305	749.3	54	20	500	20
600	24	1040	139.7	210.0	299	267	305	901.7	67	20	600	24

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ASME/ANSI B16.5 Class 900