ASME/ANSI B16.47 Series B blind flanges

ASME B16.47 Series B blind flange is a standard for large diameter steel flanges sized from NPS 26 through NPS 60 and in pressure class ratings class75, class150, class300, class400, class600, and class900.

class 75
class 150
class 300
class 400
class 600
class 900

ASME B16.47 Class 75 Series B Blind Flanges

(a)All dimensions are in inches.

(b)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Minimum Thickness (T)	Approximate Weight (lbs)
26	30.00	28.50	27.75	36	0.75	1.31	255
28	32.00	30.50	29.75	40	0.75	1.31	290
30	34.00	32.50	31.75	44	0.75	1.31	330
32	36.00	34.50	33.75	48	0.75	1.44	390
34	38.00	36.50	35.75	52	0.75	1.50	430
36	40.69	39.06	38.00	40	0.88	1.67	520
38	42.69	41.06	40.00	40	0.88	1.75	595
40	44.69	43.06	42.00	44	0.88	1.75	760
42	46.69	45.06	44.00	48	0.88	1.88	895
44	49.25	47.38	46.25	36	1.00	1.94	1065
46	51.25	49.38	48.25	40	1.00	2.00	1185
48	53.25	51.38	50.25	44	1.00	2.12	1315
50	55.25	53.38	52.25	44	1.00	2.18	1505
52	57.38	55.50	54.25	48	1.00	2.25	1665
54	59.38	57.50	56.25	48	1.00	2.38	1840
56	62.00	59.88	58.50	40	1.12	2.44	2111
58	64.00	61.88	60.50	44	1.12	2.50	2300
60	66.00	63.88	62.50	44	1.12	2.62	2500

ASME B16.47 Class 150 Series B Blind Flanges

(a)All dimensions are in inches.

(b)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Minimum Thickness (T)	Approximate Weight (lbs)
26	30.94	29.31	28.00	36	0.88	1.75	375
28	32.94	31.31	30.00	40	0.88	1.88	455
30	34.94	33.31	32.00	44	0.88	2.00	545
32	37.06	35.44	34.00	48	0.88	2.12	648
34	39.56	37.69	36.25	40	1.00	2.25	782
36	41.62	39.75	38.25	44	1.00	2.31	890
38	44.25	42.12	40.25	40	1.12	2.50	1090
40	46.25	44.12	42.50	44	1.12	2.62	1247
42	48.25	46.12	44.50	48	1.12	2.69	1393
44	50.25	48.12	46.50	52	1.12	2.81	1579
46	52.81	50.56	48.62	40	1.25	2.94	1825
48	54.81	52.56	50.75	44	1.25	3.06	2045
50	56.81	54.56	52.75	48	1.25	3.18	2284
52	58.81	56.56	54.75	52	1.25	3.31	2547
54	61.00	58.75	56.75	56	1.25	3.44	2848
56	63.00	60.75	58.75	60	1.25	3.56	3145
58	65.94	63.44	60.75	48	1.38	3.68	3560
60	67.94	65.44	63.00	52	1.38	3.81	3913

ASME B16.47 Class 300 Series B Blind Flanges

(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Minimum Thickness (T)	Approximate Weight (lbs)
26	34.12	31.62	29.00	32	1.38	3.50	905
28	36.25	33.75	31.00	36	1.38	3.50	1023
30	39.00	36.25	33.25	36	1.50	3.69	1250
32	41.50	38.50	35.50	32	1.62	4.06	1556
34	43.62	40.62	37.50	36	1.62	4.06	1719
36	46.12	42.88	39.75	32	1.75	4.06	1920
38	48.12	44.88	41.75	36	1.75	4.38	2257
40	50.12	46.88	43.88	40	1.75	4.56	2550
42	52.50	49.00	46.00	36	1.88	4.69	2875
44	54.50	51.00	48.00	40	1.88	5.00	3305
46	57.50	53.75	50.00	36	2.00	5.12	3766
48	59.50	55.75	52.25	40	2.00	5.31	4183
50	61.50	57.75	54.25	44	2.00	5.50	4629
52	63.50	59.75	56.25	48	2.00	5.68	5096
54	65.88	62.12	58.25	48	2.00	5.88	5679
56	69.50	65.00	60.50	36	2.38	6.18	6642
58	71.94	67.44	62.75	40	2.38	6.38	7347
60	73.94	69.44	65.00	40	2.38	6.56	7980

ASME B16.47 Class 400 Series B Blind Flanges

(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Minimum Thickness (T)	Approximate Weight (lbs)
26	33.50	30.75	28.00	28	1.50	3.50	875
28	36.00	33.00	30.00	24	1.62	3.75	1081
30	38.25	35.25	32.25	28	1.62	4.00	1302
32	40.75	37.50	34.38	28	1.75	4.25	1570
34	42.75	39.50	36.50	32	1.75	4.38	1780
36	45.50	42.00	38.62	28	1.88	4.69	2160
38	47.50	44.00	40.75	32	1.88	4.88	2450
40	50.00	46.25	43.00	32	2.00	5.12	2849
42	52.00	48.25	45.00	32	2.00	5.25	3160
44	54.50	50.50	47.25	32	2.12	5.50	3635
46	56.75	52.75	49.50	36	2.12	5.75	4120
48	59.50	55.25	51.50	28	2.38	6.00	4725
50	61.75	57.50	53.62	32	2.38	6.25	5303
52	63.75	59.50	55.62	32	2.38	6.44	5823
54	67.00	62.25	57.88	28	2.62	6.75	6742
56	69.00	64.25	60.12	32	2.62	6.94	7352
58	71.00	66.25	62.12	32	2.62	7.12	7986
60	74.25	69.00	64.38	32	2.88	7.44	9126

ASME B16.47 Class 600 Series B Blind Flanges

(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Minimum Thickness (T)	Approximate Weight (lbs)
26	35.00	31.75	28.62	28	1.75	4.38	1195
28	37.50	34.00	30.88	28	1.88	4.56	1427
30	40.25	36.50	33.12	28	2.00	5.00	1800
32	42.75	38.75	35.25	28	2.12	5.31	2160
34	45.75	41.50	37.50	24	2.38	5.68	2645
36	47.75	43.50	39.75	28	2.38	5.94	3013
38	50.00	45.75	41.50	28	2.38	6.12	3405
40	52.00	47.75	43.75	32	2.38	6.38	3838
42	55.25	50.50	46.00	28	2.62	6.75	4585
44	57.25	52.50	48.25	32	2.62	7.00	5105
46	59.50	54.75	50.25	32	2.62	7.31	5758
48	62.75	57.50	52.50	32	2.88	7.69	6737
50	65.75	60.00	54.50	28	3.12	8.00	7695
52	67.75	62.00	56.50	32	3.12	8.25	8425
54	70.00	64.25	58.75	32	3.12	8.56	9333
56	73.00	66.75	60.75	32	3.38	8.88	10,530
58	75.00	68.75	63.00	32	3.38	9.12	11,414
60	78.50	71.75	65.25	28	3.62	9.56	13,108

ASME B16.47 Class 900 Series B Blind Flanges

(a)All dimensions are in inches.

(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified.For more alternate flange facings, please click here!

Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Minimum Thickness (T)	Approximate Weight (lbs)
26	40.25	35.50	30.00	20	2.62	6.06	2185
28	43.50	38.25	32.25	20	2.88	6.56	2762
30	46.50	40.75	34.50	20	3.12	6.93	3334
32	48.75	43.00	36.50	20	3.12	7.31	3865
34	51.75	45.50	39.00	20	3.38	7.68	4575
36	53.00	47.25	40.50	24	3.12	7.94	4963
38	57.50	50.75	43.25	20	3.62	8.50	6253
40	59.50	52.75	45.75	24	3.62	8.81	6940
42	61.50	54.75	47.75	24	3.62	9.12	7675
44	64.88	57.62	50.00	24	3.88	9.56	8955
46	68.25	60.50	52.50	24	4.12	10.06	10,426
48	70.25	62.50	54.50	24	4.12	10.38	11,398

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