American Standard Flange Dimensions | ASME | ANSI

ASME – American Society of Mechanical Engineers

For the same size and pressure rating, Series A flanges are capable of handling more loading as typically they are heavier and more robust. Consequently, they are more expensive than Series B flanges. Series A flanges are mainly used for new pipelines and equipment applications.

ASME B 16.47 Series B

Series B flanges are typically used for replacement and refurbishment applications. Series B requires smaller fasteners than Series A as the bolt circle diameter is smaller, allowing less movement after flange installation.

ANSI – American National Standard Institute (B 16.5)

These are steel pipe flanges and flanged fitting covering sizes from 0.5-inch up to 24-inch. They are available in the below pressure classes:

150#

	OD	ID	Flange Thickness(T)		BC
Nominal Pipe Size	Outer Diameter	Inner Diameter	Slip On	Blind	Bolt Circel PCD	Hole Diameter	No Of Holes
100	254	116	28.6	28.7	200	22	8
125	279.4	144	30.7	30.7	235	22	8
150	317.5	171	33.2	33.2	270	22	12
200	381	222	33.2	33.2	330.2	25	12
250	44.5	276	38.1	38.1	387.3	28	16
300	520.7	327	41.4	41.4	450.8	32	16
350	584.2	361	49.2	49.3	514.3	32	20
400	647.7	411	54.3	54.4	571.5	35	20
450	711.2	462	57.1	57.2	628.6	35	24
500	774.7	513	59.1	59.2	685.8	35	24
550	838	565	63.5	63.5	743	35	24
600	914	615	68.3	68.3	813	42	24
650	971	665	76.2	76.2	876.3	48	28
700	1035	716	79.5	79.5	940	48	28
750	1092	766	80	80.5	997	48	28
800	1149	820	82.5	84.6	1054	48	28
850	1206	865	85.5	88.3	1105	48	28
900	1270	919	87.8	93.3	1168	54	32
950	1327	970	89	97	1219	54	32
1000	1377	1021	92.2	101	1276	54	36
1050	1448	1072	96.7	106	1340	54	36
1100	1504	1123	101.6	110	1397	54	36
1150	1562	1173	105	114.5	1454	54	40
1200	1651	1225	114.3	121.5	1543	54	40

AWWA – American Water Works Association

AWWA ratings are for a broader range of pipe sizes – 3-inch to 144-inch, and only cover ring, hub type, blind, and threaded iron flanges. Their pressure rating for the different flanges ranges from 86 PSI to 300 PSI.

AWWA C207 Table 2B

	OD	ID	Flange Thickness(T)		BC
Nominal Pipe Size	Outer Diameter	Inner Diameter	Slip On	Blind	Bolt Circel PCD	Hole Diameter	No Of Holes
100	228	116	15.8	15.8	190.5	16	8
123	254	144	15.8	15.8	216	19	8
150	280	171	17.4	17.5	241.3	19	8
200	342	222	17.5	17.5	298.5	19	8
250	406	276	17.4	17.5	362	22	12
300	482	327	17.4	18.3	431.8	22	12
350	533	361	17.4	20	476.2	25	12
400	597	413	17.4	22.7	539.7	25	16
450	635	462	17.4	24.2	578	28.5	16
500	698	513	19.1	26.5	635	28.5	20
550	749	565	19.2	28.7	692	32	20
600	813	615	19.2	30.8	749.3	32	20
650	870	665	20.6	33.2	806	32	24
700	927	716	22.2	35.5	863.6	32	28
750	984	766	22.2	36.7	914.4	38	28
800	1060	817	23.8	40	978	38	28
850	1111	864	23.8	42.2	1029	38	32
900	1168	920	25.4	44	1086	38	32
950	1238	970	25.4	47	1149	38	32
1000	1290	1020	25.4	49	1200	38	36
1050	1346	1071	28.5	51.4	1257	38	36
1100	1403	1122	28.5	53.7	1314	38	40
1150	1455	1173	28.5	55.7	1365	38	40
1200	1511	1225	28.6	58	1422	38	44

AWWA C207 Table 2D

Nominal Pipe Size	Outer Diameter	Inner Diameter	Thickness		Bolt Circle PCD	Hole Dia	No of Holes
			Slip On	Blind
50	152	62	15.8	15.8	120.6	19	4
65	178	74.5	15.8	15.8	139.7	19	4
75	190	91	15.8	15.8	152.7	19	4
100	228	116	15.8	15.8	190.5	19	8
125	254	144	15.8	16.5	216	22	8
150	279	171	17.4	17.6	241.3	22	8
200	434	222	17.4	20.6	298.5	22	8
250	406	276	17.4	24.3	362	25	12
300	483	327	20.6	28.4	431.8	25	12
350	533	361	23.8	28.8	476.2	28	12
400	597	413	25.4	32.2	539.7	28	16
450	635	462	26.9	33.8	578	32	16
500	699	513	28.5	36.8	635	32	20
550	749	563	30	40	692	35	20
600	813	614	31.8	42.2	749	35	20
650	869	666	33.4	45.4	806	35	24
700	927	717	33.4	48.5	863.6	35	28
750	984	768	35	51	914.4	35	28
800	1060	819	38	54.6	978	42	28
850	1111	869	38	57.3	1028.7	42	32
900	1168	921	41.2	60.2	1086	42	32
950	1238	971	41.2	63.7	1149	42	32
1000	1290	1023	41.2	66.3	1200	42	36
1050	1346	1074	44.4	69.4	1257	42	36
1100	1403	1124	44.4	72.3	1314	42	40
1200	1511	1226	47.6	78	1422	42	44
1350	1683	1378	54	87.3	1594	48	44
1500	1854	1531	57.2	96	1759	48	52
1650	2032	1683	63.5	105	1930	48	52
1800	2197	1836	66.7	114	2095	48	60

AWWA C207 Table 2E

	OD	ID	Flange Thickness(T)		BC
Nominal Pipe Size	Outer Diameter	Inner Diameter	Slip On	Blind	Bolt Circel PCD	Hole Diameter	No Of Holes
100	228.6	116	28.7	28.7	190.5	19	8
125	254	143	30.2	30.2	216	22	8
150	279	171	33.4	33.4	241.3	22	8
200	343	222	38.1	38.1	298.4	22	8
250	406	276	39.7	39.7	361.8	25	12
300	483	327	44.4	44.4	431.8	25	12
350	533	361	47.6	47.6	476.25	28	12
400	597	411	50.8	50.8	539.7	28	16
450	635	462	54	54	577.8	32	16
500	698	513	60.3	60.3	635	32	20
600	813	616	66.7	66.7	749.3	35	20
650	870	665	69.8	69.8	806.4	35	24
700	927	716	69.8	69.8	863.6	35	28
750	984	766	73	73	914.4	35	28
900	1168	919	79.4	81.5	1085.8	42	32
950	1238	970	79.4	86.2	1149.3	42	32
1000	1289	1021	82.6	90	1200	42	36
1050	1346	1072	85.7	94	1257.3	42	36
1100	1403	1123	85.7	98	1314.4	42	40
1200	1511	1224	88.9	105.6	1422.4	42	44
1350	1683	1376	95.2	118	1593.8	48	44
1500	1854	1528	98.4	130	1759	48	52
1650	2032	1682	107.9	142	1930.4	48	52
1800	2197	1833	111	154	2095.5	48	60

AWWA C207 Table 2F

	OD	ID	Flange Thickness(T)		BC
Nominal Pipe Size	Outer Diameter	Inner Diameter	Slip On	Blind	Bolt Circel PCD	Hole Diameter	No Of Holes
100	254	116	28.6	28.7	200	22	8
125	279.4	144	30.7	30.7	235	22	8
150	317.5	171	33.2	33.2	270	22	12
200	381	222	33.2	33.2	330.2	25	12
250	44.5	276	38.1	38.1	387.3	28	16
300	520.7	327	41.4	41.4	450.8	32	16
350	584.2	361	49.2	49.3	514.3	32	20
400	647.7	411	54.3	54.4	571.5	35	20
450	711.2	462	57.1	57.2	628.6	35	24
500	774.7	513	59.1	59.2	685.8	35	24
550	838	565	63.5	63.5	743	35	24
600	914	615	68.3	68.3	813	42	24
650	971	665	76.2	76.2	876.3	48	28
700	1035	716	79.5	79.5	940	48	28
750	1092	766	80	80.5	997	48	28
800	1149	820	82.5	84.6	1054	48	28
850	1206	865	85.5	88.3	1105	48	28
900	1270	919	87.8	93.3	1168	54	32
950	1327	970	89	97	1219	54	32
1000	1377	1021	92.2	101	1276	54	36
1050	1448	1072	96.7	106	1340	54	36
1100	1504	1123	101.6	110	1397	54	36
1150	1562	1173	105	114.5	1454	54	40
1200	1651	1225	114.3	121.5	1543	54	40

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ASME – American Society of Mechanical Engineers

ANSI – American National Standard Institute (B 16.5)

AWWA – American Water Works Association

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