Large Flanges: B16.47 Series A/B

Quick Reference

ASME B16.47 covers large-diameter flanges (NPS 26 to 60”) for Classes 150-900. Series A (MSS SP-44 origin) and Series B (API 605 origin) differ in dimensions and bolting for the same nominal size.

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Need a printable version? Download the ASME B16.47 Series A Chart or ASME B16.47 Series B Chart for large flange dimensions.

ASME B16.47 Series A Flange Dimensions

The tables below show ASME B16.47 Series A large flange dimensions including: outside diameter (OD), minimum thickness for weld neck and blind flanges, raised face OD, hub diameter, length through hub, weight, and bolt hole specifications.

Class 150

Dimensions of ASME B16.47-A flanges class 150 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	34.25	2.69	2.69	29.50	26.62	4.75	300	702	24	1.38	31.75
28	36.50	2.81	2.81	31.50	28.62	4.94	345	833	28	1.38	34
30	38.75	2.94	2.94	33.75	30.75	5.38	400	982	28	1.38	36
32	41.75	3.19	3.19	36	32.75	5.69	505	1238	28	1.62	38.50
34	43.75	3.25	3.25	38	34.75	5.88	540	1384	32	1.62	40.50
36	46	3.56	3.56	40.25	36.75	6.19	640	1676	32	1.62	42.75
38	48.75	3.44	3.44	42.25	39	6.19	720	1819	32	1.62	45.25
40	50.75	3.56	3.56	44.25	41	6.44	775	2040	36	1.62	47.25
42	53	3.81	3.81	47	43	6.75	890	2380	36	1.62	49.50
44	55.25	4	4	49	45	7	990	2715	40	1.62	51.75
46	57.25	4.06	4.06	51	47.12	7.31	1060	2961	40	1.62	53.75
48	59.50	4.25	4.25	53.50	49.12	7.56	1185	3350	44	1.62	56
50	61.75	4.38	4.38	55.50	51.25	8	127	3716	44	1.88	58.25
52	64	4.56	4.56	57.50	53.25	8.25	1410	4156	44	1.88	60.25
54	66.25	4.75	4.75	59.50	55.25	8.50	1585	4636	44	1.88	62.75
56	68.75	4.88	4.88	62	57.38	9	1760	5130	48	1.88	65
58	71	5.06	5.06	64	59.38	9.25	1915	5675	48	1.88	67.25
60	73	5.19	5.19	66	61.38	9.44	2353	6155	52	1.88	69.25

Class 300

Dimensions of ASME B16.47-A flanges class 300 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	38.25	3.12	3.31	29.50	28.38	7.25	605	1079	28	1.75	34.50
28	40.75	3.38	3.56	31.50	30.50	7.75	745	1315	28	1.75	37
30	43	3.62	3.75	33.75	32.56	8.25	870	1545	28	1.88	39.25
32	45.25	3.88	3.94	36	34.69	8.75	1005	1795	28	2	41.50
34	47.50	4	4.12	38	36.88	9.12	1145	2068	28	2	43.50
36	50	4.12	4.38	40.25	39	9.50	1275	2435	32	2.12	46
38	46	4.25	4.25	40.50	39.12	7.12	695	2001	32	1.62	43
40	48.75	4.50	4.50	42.75	41.12	7.62	840	2380	32	1.75	45.50
42	50.75	4.69	4.69	44.75	43.25	7.88	950	2689	32	1.75	47.50
44	53.25	4.88	4.88	47	45.25	8.12	1055	3079	32	1.88	49.75
46	55.75	5.06	5.06	49	47.38	8.50	1235	3500	28	2	52
48	57.75	5.25	5.25	51.25	49.38	8.81	1380	3896	32	2	54
50	60.25	5.50	5.50	53.50	51.38	9.12	1530	4442	32	2.12	56.25
52	62.25	5.69	5.69	55.50	53.38	9.38	1660	4906	32	2.12	56.25
54	65.25	6	6	57.75	55.50	9.94	2050	5684	28	2.38	61
56	67.25	6.06	6.06	59.75	57.62	10.25	2155	6099	28	2.38	63
58	69.25	6.25	6.25	62	59.62	10.50	2270	6669	32	2.38	65
60	71.25	6.44	6.44	64	61.62	10.75	2470	7274	32	2.38	67

Class 400

Dimensions of ASME B16.47-A flanges class 400 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	38.25	3.50	3.88	29.50	28.62	7.62	650	1263	28	1.88	34.50
28	40.75	3.75	4.12	31.50	30.81	8.12	785	1520	28	2	37
30	43	4	4.38	33.75	32.94	8.62	905	1802	28	2.62	39.25
32	45.25	4.25	4.56	36	35	9.12	1065	2075	28	2.62	41.25
34	47.50	4.38	4.81	38	37.81	9.50	1200	2415	28	2.62	43.50
36	50	4.50	5.06	40.25	39.38	9.88	1340	2815	32	2.62	46
38	47.50	4.88	4.88	40.75	39.50	8.12	935	2450	32	1.88	44
40	50	5.12	5.12	43	41.50	8.50	1090	2850	32	2	46.25
42	52	5.25	5.25	45	43.62	8.81	1190	3160	32	2	48.25
44	54.50	5.50	5.50	47.25	43.62	9.18	1375	3635	32	2.62	50.50
46	56.75	5.75	5.75	49.50	47.75	9.62	1525	4120	36	2.62	52.75
48	59.50	6	6.00	51.50	49.88	10.12	1790	4725	28	2.38	55.25
50	61.75	6.19	6.25	53.62	52	10.56	1950	5303	32	2.38	57.50
52	63.75	6.38	6.44	55.62	54	10.88	2125	5823	32	2.38	59.50
54	67	6.69	6.75	57.88	56.12	11.38	2565	6742	28	2.62	62.25
56	69	6.88	6.94	60.12	58.25	11.75	2710	7352	32	2.62	64.25
58	71	7	7.12	62.12	60.25	12.06	3230	7986	32	2.62	66.25
60	74.25	7.31	7.44	64.38	62.38	12.56	3820	9126	32	2.88	69

Class 600

Dimensions of ASME B16.47-A flanges class 600 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	40	4.25	4.94	29.50	29.44	8.75	940	1760	28	2	36
28	42.25	4.38	5.19	31.50	31.62	9.25	160	2061	28	2.12	38
30	44.50	4.50	5.50	33.75	33.94	9.75	1210	2423	28	2.12	40.25
32	47	4.63	5.81	36	36.15	10.25	1375	2858	28	2.38	42.50
34	49	4.75	6.06	38	38.31	10.62	1540	3237	28	2.38	44.50
36	51.75	4.88	6.38	40.25	40.62	11.12	1705	3800	28	2.62	47
38	50	6	6.12	41.50	40.25	10	1470	3405	28	2.38	45.75
40	52	6.25	6.38	43.75	42.25	10.38	1630	3838	32	2.38	47.75
42	55.25	6.63	6.75	46	44.38	11	2030	4585	28	2.62	50.50
44	57.25	6.81	7	48.25	46.50	11.38	2160	5105	32	2.62	52.50
46	59.50	7.06	7.31	50.25	48.62	11.81	2410	5758	32	2.62	54.75
48	62.75	7.44	7.69	52.50	50.75	12.44	2855	6737	32	2.88	57.50
50	65.75	7.75	8	54.50	52.88	12.94	3330	7695	28	3.12	60
52	67.75	8	8.25	56.50	54.88	13.25	3560	8425	32	3.12	62
54	70	8.25	8.56	58.75	57	13.75	3920	9333	32	3.12	64.25
56	73	8.56	8.88	60.75	59.12	14.25	4280	10530	32	3.38	66.75
58	75	8.75	9.12	63	61.12	14.56	4640	11414	32	3.38	68.75
60	78.50	9.19	9.56	65.25	63.38	15.31	5000	13108	28	3.62	71.75

Class 900

Dimensions of ASME B16.47-A flanges class 900 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	42.75	5.50	6.31	29.50	30.50	11.25	1525	2566	20	2.88	37.50
28	46	5.62	6.75	31.50	32.75	11.75	1810	3178	20	3.12	40.25
30	48.50	5.88	7.18	33.75	35	12.25	2120	3759	20	3.12	42.75
32	51.75	6.25	7.62	36	37.25	13	2545	4541	20	3.38	45.50
34	55	6.50	8.06	38	39.62	13.75	2970	5425	20	3.62	48.25
36	57.50	6.75	8.44	40.25	41.88	14.25	3395	6210	20	3.62	50.75
38	57.50	7.50	8.50	43.25	42.25	13.88	3385	6253	20	3.62	50.75
40	59.50	7.75	8.81	45.75	44.38	14.31	3620	6940	24	3.62	52.75
42	61.50	8.12	9.12	47.75	46.31	14.62	3960	7675	24	3.62	54.75
44	64.88	8.44	9.56	50	48.62	15.38	4300	8955	24	3.88	57.62
46	68.25	8.88	10.88	52.50	50.88	16.18	4640	10426	24	4.12	60.50
48	70.25	9.19	10.88	54.50	52.88	16.50	4980	11398	24	4.12	60.50

ASME B16.47 Series B Flange Dimensions

Class 75

Dimensions of ASME B16.47-B flanges class 75 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	30	1.25	1.25	27.75	26.63	2.25	80	255	36	0.75	28.50
28	32	1.25	1.25	29.75	28.63	2.38	85	290	40	0.75	30.50
30	34	1.25	1.25	31.75	30.63	2.50	90	330	44	0.75	32.50
32	36	1.32	1.38	33.75	32.63	2.69	105	390	48	0.75	34.50
34	38	1.32	1.44	35.75	34.63	2.82	110	430	52	0.75	36.50
36	40.69	1.38	1.61	38	36.81	3.32	145	58	40	0.75	39.06
38	42.69	1.44	1.69	40	38.81	3.44	160	595	40	0.88	41.06
40	44.69	1.44	1.69	42	40.81	3.57	170	760	44	0.88	43.06
42	16.69	1.50	1.82	44	42.81	3.69	185	895	48	0.88	45.06
44	49.25	1.63	1.88	46.25	44.88	4.07	230	1065	36	1	47.38
46	51.25	1.69	1.94	48.25	46.88	4.19	245	1185	40	1	49.38
48	53.25	1.75	2.07	50.25	48.88	4.32	270	1315	44	1	51.38
50	55.25	1.82	2.13	52.25	50.94	4.50	290	1505	44	1	53.38
52	57.38	1.82	2.19	54.25	52.94	4.69	310	1665	48	1	55.50
54	59.38	1.88	2.31	56.25	55	4.88	340	1840	48	1	57.50
56	62	1.94	2.38	58.50	57.13	5.25	400	2110	40	1.12	59.88
58	64	2	2.44	60.50	59.13	5.38	430	2300	44	1.12	61.88
60	66	2.13	2.56	62.50	61.13	5.63	475	2500	44	1.12	63.88

Class 150

Dimensions of ASME B16.47-B flanges class 150 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	30.94	1.57	1.69	28	26.94	3.44	120	375	36	0.88	29.31
28	32.94	1.69	1.82	30	28.94	3.69	140	455	40	0.88	31.31
30	34.94	1.69	1.94	32	31	3.88	150	545	44	0.88	33.31
32	37.06	1.75	2.07	34	33.06	4.19	170	648	48	0.88	35.44
34	39.56	1.88	2.13	36.25	35.12	4.28	210	782	40	1	37.69
36	41.62	2	2.25	38.25	37.19	4.57	240	890	44	1	39.75
38	44.25	2.07	2.44	40.25	39.25	4.82	290	1090	40	1.12	42.12
40	46.25	2.13	2.57	42.50	41.31	5	310	1247	44	1.12	44.12
42	48.25	2.25	2.63	44.50	43.38	5.19	345	1393	48	1.12	46.12
44	50.25	2.32	2.75	46.50	45.38	5.32	310	1579	52	1.12	48.12
46	52.81	2.38	2.88	48.62	47.44	5.63	435	1825	40	1.25	50.56
48	54.81	2.50	3	50.75	48.50	5.82	480	2045	44	1.25	52.56
50	56.81	2.63	3.13	52.75	51.50	6	520	2284	48	1.25	54.56
52	58.81	2.69	3.25	54.75	53.56	6.13	520	2547	52	1.25	56.56
54	61	2.75	3.38	56.75	55.62	6.32	620	2848	56	1.25	58.75
56	63	2.82	3.50	58.75	57.69	6.50	650	3145	60	1.25	60.75
58	65.94	2.88	3.62	60.75	59.69	6.82	780	3560	48	1.38	63.44
60	67.94	2.94	3.75	63	61.81	7	850	3913	52	1.38	65.44

Class 300

Dimensions of ASME B16.47-B flanges class 300 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	34.12	3.44	3.44	29	26.19	5.63	400	905	32	1.38	31.62
28	36.25	3.44	3.44	31	28.19	5.81	450	1023	36	1.38	33.75
30	39	3.63	3.63	33.25	30.25	6.16	550	1250	36	1.50	36.25
32	41.50	4	4	35.50	32.25	6.56	685	1556	32	1.62	38.50
34	43.62	4	4	37.50	34.25	6.75	750	1719	36	1.62	40.62
36	46.12	4	4	39.75	36.25	7.06	840	1920	32	1.75	42.88
38	48.12	4.31	4.31	41.75	38.25	7.50	915	2257	36	1.75	44.88
40	50.12	4.50	4.50	43.88	40.25	7.75	990	2550	40	1.75	46.88
42	52.50	4.63	4.63	46	42.31	8	1135	2875	36	1.88	49
44	54.50	4.94	4.94	48	44.31	8.38	1235	3305	40	1.88	51
46	57.50	5	5.06	50	46.31	8.69	1470	3766	36	2	53.75
48	59.50	5	5.25	52.25	48.31	8.75	1575	4183	40	2	55.75
50	61.50	5.38	5.44	54.25	50.31	9.19	1710	4629	44	2	57.75
52	63.50	5.56	5.61	56.25	52.31	9.50	1840	5096	48	2	59.75
54	65.88	5.32	5.81	58.25	54.31	9.38	1980	5679	48	2	62.12
56	69.50	6	6.12	60.50	56.31	10.50	2295	6642	36	2.38	65
58	71.94	6	6.31	62.75	58.31	10.75	2770	7347	40	2.38	67.44
60	73.94	5.88	6.50	65	60.31	10.63	2870	7980	40	2.38	69.44

Class 400

Dimensions of ASME B16.47-B flanges class 400 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	33.50	3.50	3.50	28	27.12	5.88	360	875	28	1.50	30.75
28	36	3.75	3.75	30	29.12	6.25	450	1081	24	1.62	33
30	38.25	4	4	32.25	31.25	6.69	530	1302	28	1.62	35.25
32	40.75	4.25	4.25	34.38	33.25	7.06	635	1570	28	1.75	37.50
34	42.75	4.38	4.38	36.50	35.38	7.38	690	1780	32	1.75	39.50
36	45.50	4.69	4.69	38.62	37.50	7.88	855	2160	28	1.88	42

Class 600

Dimensions of ASME B16.47-B flanges class 600 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	35	4.38	4.38	28.62	27.50	7.12	550	1195	28	1.75	31.75
28	37.50	4.56	4.56	30.88	29.62	7.50	650	1427	28	1.88	34
30	40.25	4.94	5	33.12	31.75	8.062	810	1800	28	2	36.50
32	42.75	5.12	5.31	35.25	33.88	8.50	950	2160	28	2.12	38.75
34	45.75	5.56	5.68	37.50	36	9.19	1205	2645	24	2.38	41.50
36	47.75	5.75	5.94	39.75	38.12	9.56	1340	3013	28	2.38	43.50

Class 900

Dimensions of ASME B16.47-B flanges class 900 All ASME B16.47 flanges dimensions are in inches

NPS	O.D.	Min Thk (WN)	Min Thk (Blind)	Raised Face O.D.	Hub Dia.	Length Thru Hub	Weight WN (lbs)	Weight Blind (lbs)	No. Holes	Hole Dia.	Bolt Circle Dia.
26	40.25	5.31	6.06	30	29.25	10.19	1050	2185	20	2.63	35.50
28	43.50	5.81	6.56	32.25	31.38	10.88	1520	2762	20	2.88	38.25
30	46.50	6.12	6.93	34.50	33.50	11.38	1820	3334	20	3.13	40.75
32	48.75	6.31	7.31	36.50	35.75	11.94	2065	3865	20	3.13	43
34	51.75	6.75	7.68	39	37.88	12.56	2450	4575	20	3.38	45.50
36	53	6.81	7.94	40.50	40	12.81	2520	4963	24	3.13	47.25

Tolerances of ASME B16.47 Flanges

±1.2mmDiamet

OD		±0.12″	±3.2mm
The diameter of Flange Face	0.06″ (1.66mm) raised face	±0.08″	±2.0mm
	0.25″ (6.44mm) raised face	±0.04″
er ofThe diameter of the Hub at the Point of Welding		±0.21″, -0.06″	±5.5mm, -1.6mm
ID		±0.12″, -0.06″	±3.2mm, -1.6mm
Thk.	Up to 1.0″ Thickness	±0.12″, -0.00″	±3.2mm, -0.00mm
	1.0″ to 2.0″	±0.19″, -0.00″	±4.8mm, -0.00mm
	2.0″ to 3.0″	±0.31″, -0.00″	±7.9mm, -0.00mm
	Over 3.0′ Thickness	±0.38″, -0.00″	±9.6mm, -0.00mm
Bolts Drilling	Bolt Circle Diameter	±0.06″	±1.6mm
	Bolt Hole Spacing	±0.03″	±0.8mm
The eccentricity of the Bolt Circle and Facing vs. Bore		±0.06″	±1.6mm
Length Through Hub for Welding Neck Flanges		±0.19″	±4.8mm