ASME B16.47 Series A FlangeS WN&BL

ASME B16.47 Series A Weld Neck Flanges & Blind Flange Manufacturer

ASME B16.47 Series A specifies large-diameter steel flanges from NPS 26 to NPS 60, designed for demanding pressure pipelines. Series A flanges are the heavier and stronger version of the ASME B16.47 standard, featuring thicker sections and larger bolt circle diameters. These flanges are commonly used in oil & gas, refineries, chemical plants, and power generation facilities where maximum safety and durability are required.

The B16.47 standard is divided into Series A and Series B, and covers blind flange and welding neck flange. Below is a comparison chart of the differences between Series A & Series B:

While ASME B16.47 Series A has the same dimension requirment with MSS SP 44 standard.ASME B16.47 Series B has the same dimension requirment with API 605.

MSS SP-44 covers similar Class 150, 300, 400, 600, and 900 flanges for use with high strength pipe made from
materials having yield strength greater than 276 MPa (40,000 psi)

Types of Flanges Covered

Type	Description	Notes
Series A	Formerly MSS SP-44 flanges	Thicker, heavier, and stronger; used in high-pressure, critical applications
Series B	Formerly API 605 flanges	Lighter and more compact; used in general piping and process industries

This Standard covers pressure–temperature ratings,materials, dimensions, tolerances, marking, and testing For pipe flanges in sizes NPS 26 through NPS 60. Included are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (Metric) and U.S. Customary units, with diameter

Matrial selection for ASME B16.47 Flanges

Material Group No.	Nominal Designation	Forgings	Castings	Plates [Note (1)]
1.1	C-Si	A105	A216 Gr. WCB	A515 Gr. 70
1.1	C-Mn-Si	A350 Gr. LF2	…	A516 Gr. 70
1.1	C-Mn-Si-V	A350 Gr. LF6 Cl. 1	…	…
1.1	3½Ni	A350 Gr. LF3	…	…
1.2	C-Mn-Si-V	A350 Gr. LF6 Cl. 2	…	…
1.3	C-Mn-Si	…	…	A516 Gr. 65
1.4	C-Si	A350 Gr. LF1 Cl. 1	…	A515 Gr. 60
1.4	C-Mn-Si	…	…	A516 Gr. 60
1.5	C-½Mo	A182 Gr. F1	…	A204 Gr. A
1.7	¼Cr-½Mo	A182 Gr. F2	…	…
1.9	1¼Cr-½Mn-Si	A182 Gr. F11 Cl. 2	…	A387 Gr. 11 Cl. 2
1.1	2¼Cr-1Mo	A182 Gr. F22 Cl. 3	A217 Gr. WC9	A387 Gr. 22 Cl. 2
1.11	3Cr-1Mo	A182 F21	…	A387 Gr. 21 Cl 2
1.13	5Cr-½Mo	A182 Gr. F5A	A217 Gr. C5	…
1.14	9Cr-1Mo	A182 Gr. F9	A217 Gr. C12	…
1.15	9Cr-1Mo-V	A182 Gr. F91 Type 1	A217 Gr. C12A	A387 Gr. 91 Cl. 2
1.17	1Cr-½Mo	A182 Gr. F12 Cl. 2	…	…
1.18	5Cr-½Mo	A182 Gr. F5	…	…
1.18	9Cr-2W-V	A182 Gr. F92	…	…
2.1	18Cr-8Ni	A182 Gr. F304	A351 Gr. CF3	A240 Gr. 304
2.1	18Cr-8Ni	A182 Gr. F304H	A351 Gr. CF8	A240 Gr. 304H
2.2	16Cr-12Ni-2Mo	A182 Gr. F316	A351 Gr. CF3M	A240 Gr. 316
2.2	16Cr-12Ni-2Mo	A182 Gr. F316H	A351 Gr. CF8M	A240 Gr. 316H
2.2	18Cr-13Ni-3Mo	A182 Gr. F317	…	A240 Gr. 317
2.3	18Cr-8Ni	A182 Gr. F304L	…	A240 Gr. 304L
2.3	16Cr-12Ni-2Mo	A182 Gr. F316L	…	A240 Gr. 316L
2.3	18Cr-13Ni-3Mo	A182 Gr. F317L	…	…
2.4	18Cr-10Ni-Ti	A182 Gr. F321	…	A240 Gr. 321
2.4	18Cr-10Ni-Ti	A182 Gr. F321H	…	A240 Gr. 321H
2.5	18Cr-10Ni-Cb	A182 Gr. F347	…	A240 Gr. 347
2.5	18Cr-10Ni-Cb	A182 Gr. F347H	…	A240 Gr. 347H
2.5	18Cr-10Ni-Cb	A182 Gr. F348	…	A240 Gr. 348
2.5	18Cr-10Ni-Cb	A182 Gr. F348H	…	A240 Gr. 348H
2.6	23Cr-12Ni	…	…	A240 Gr. 309H
2.7	25Cr-20Ni	A182 Gr. F310H	…	A240 Gr. 310H
2.8	20Cr-18Ni-6Mo	A182 Gr. F44	A351 Gr. CK3MCuN	A240 Gr. S31254
2.13	22Cr-5Ni-3Mo-N	A182 Gr. F51	A995 CD3MN (4A)	A240 Gr. S31803
2.13	22Cr-5Ni-3Mo-N	A182 Gr. F60	…	…
2.13	22Cr-5Ni-3Mo-N	…	…	A240 Gr. S32205
2.13	25Cr-5Ni-3Mo-2Cu	…	…	A240 Gr. S32550
2.13	25Cr-7Ni-4Mo-N	A182 Gr. F53	…	A240 Gr. S32750
2.13	25Cr-7Ni-3.5Mo-N-Cu-W	A182 Gr. F55	…	A240 Gr. S32760

Facing Finish Requirements of ASME B16.47

Raised Face (RF): 125–250 µin (3.2–6.3 µm) serrated finish
RTJ (Ring Type Joint): Groove dimensions per ASME B16.20
Flat Face (FF): Only for special applications

ASME B16.47 Series A Class 150 Flange Dimensions

Nominal Size	Outside Diameter(OD)	Min. Thickness [Note1] – WNF (tf)	Min. Thickness [Note1] – Blind (tf)	Length Through Hub (Y)	Hub Dia. Base [Note2] (X)	Hub Dia. Top (A	Raised Face Dia. (R)	Drilling – Bolt Circle Dia	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	Min. Fillet Radius（r1)
26	34.25	2.63	2.63	4.69	26.62	26	29.5	31.75	24	13⁄8	11⁄4	0.38
28	36.5	2.75	2.75	4.88	28.62	28	31.5	34	28	13⁄8	11⁄4	0.44
30	38.75	2.88	2.88	5.32	30.75	30	33.75	36	28	13⁄8	11⁄4	0.44
32	41.75	3.13	3.13	5.63	32.75	32	36	38.5	28	15⁄8	11⁄2	0.44
34	43.75	3.19	3.19	5.82	34.75	34	38	40.5	32	15⁄8	11⁄2	0.5
36	46	3.5	3.5	6.13	36.75	36	40.25	42.75	32	15⁄8	11⁄2	0.5
38	48.75	3.38	3.38	6.13	39	38	42.25	45.25	32	15⁄8	11⁄2	0.5
40	50.75	3.5	3.5	6.38	41	40	44.25	47.25	36	15⁄8	11⁄2	0.5
42	53	3.75	3.75	6.69	43	42	47	49.5	36	15⁄8	11⁄2	0.5
44	55.25	3.94	3.94	6.94	45	44	49	51.75	40	15⁄8	11⁄2	0.5
46	57.25	4	4	7.25	47.12	46	51	53.75	40	15⁄8	11⁄2	0.5
48	59.5	4.19	4.19	7.5	49.12	48	53.5	56	44	15⁄8	11⁄2	0.5
50	61.75	4.32	4.32	7.94	51.25	50	55.5	58.25	44	17⁄8	13⁄4	0.5
52	64	4.5	4.5	8.19	53.25	52	57.5	60.5	44	17⁄8	13⁄4	0.5
54	66.25	4.69	4.69	8.44	55.25	54	59.5	62.75	44	17⁄8	13⁄4	0.5
56	68.75	4.82	4.82	8.94	57.38	56	62	65	48	17⁄8	13⁄4	0.5
58	71	5	5	9.19	59.38	58	64	67.25	48	17⁄8	13⁄4	0.5
60	73	5.13	5.13	9.38	61.38	60	66	69.25	52	17⁄8	13⁄4	0.5

Dimensions are in inches.

1) The minimum flange thickness does not include the raised face thickness
2) This dimension is for the large end of hub, which may be straight or tapered.
3) Weldneck Bore/ID is to be specified by the purchaser
4) For other details and tolerances see specification.

ANSI/ASME B16.47 Series A Class 300 Flange Dimensions

Nominal Size	Outside Diameter(OD)	Min. Thickness [Note1] – WNF (tf)	Min. Thickness [Note1] – Blind (tf)	Length Through Hub (Y)	Hub Dia. Base [Note2] (X)	Hub Dia. Top (A	Raised Face Dia. (R)	Drilling – Bolt Circle Dia	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	Min. Fillet Radius（r1)
26	38.25	3.07	3.25	7.19	28.38	26	29.5	34.5	28	13/4	15/8	0.38
28	40.75	3.32	3.5	7.69	30.5	28	31.5	37	28	13/4	15/8	0.44
30	43	3.57	3.69	8.19	32.56	30	33.75	39.25	28	17/8	13/4	0.44
32	45.25	3.82	3.88	8.69	34.69	32	36	41.5	28	2	17/8	0.44
34	47.5	3.94	4.07	9.07	36.88	34	38	43.5	28	2	17/8	0.5
36	50	4.07	4.32	9.44	39	36	40.25	46	32	21/8	2	0.5
38	46	4.19	4.19	7.06	39.12	38	40.5	43	32	15/8	11/2	0.5
40	48.75	4.44	4.44	7.56	41.25	40	42.75	45.5	32	13/4	15/8	0.5
42	50.75	4.63	4.63	7.82	43.25	42	44.75	47.5	32	13/4	15/8	0.5
44	53.25	4.82	4.82	8.06	45.25	44	47	49.75	32	17/8	13/4	0.5
46	55.75	5	5	8.44	47.38	46	49	52	28	2	17/8	0.5
48	57.75	5.19	5.19	8.75	49.38	48	51.25	54	32	2	17/8	0.5
50	60.25	5.44	5.44	9.07	51.38	50	53.5	56.25	32	21/8	2	0.5
52	62.25	5.63	5.63	9.32	53.38	52	55.5	58.25	32	21/8	2	0.5
54	65.25	5.94	5.94	9.88	55.5	54	57.75	61	28	23/8	21/4	0.5
56	67.25	6	6	10.19	57.62	56	59.75	63	28	23/8	21/4	0.5
58	69.25	6.19	6.19	10.44	59.62	58	62	65	32	23/8	21/4	0.5
60	71.25	6.38	6.38	10.69	61.62	60	64	67	32	23/8	21/4	0.5

ANSI B16.47 Series A Class 400 Flange Dimensions

Nominal Size	Outside Diameter(OD)	Min. Thickness [Note1] – WNF (tf)	Min. Thickness [Note1] – Blind (tf)	Length Through Hub (Y)	Hub Dia. Base [Note2] (X)	Hub Dia. Top (A	Raised Face Dia. (R)	Drilling – Bolt Circle Dia	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	Min. Fillet Radius（r1)
26	38.25	3.5	3.88	7.62	28.62	26	29.5	34.5	28	17/8	13/4	0.44
28	40.75	3.75	4.12	8.12	30.81	28	31.5	37	28	2	17/8	0.5
30	43	4	4.38	8.62	32.94	30	33.75	39.25	28	21/8	2	0.5
32	45.25	4.25	4.56	9.12	35	32	36	41.5	28	21/8	2	0.5
34	47.5	4.38	4.81	9.5	37.19	34	38	43.5	28	21/8	2	0.56
36	50	4.5	5.06	9.88	39.38	36	40.25	46	32	21/8	2	0.56
38	47.5	4.88	4.88	8.12	39.5	38	40.75	44	32	17/8	13/4	0.56
40	50	5.12	5.12	8.5	41.5	40	43	46.25	32	2	17/8	0.56
42	52	5.25	5.25	8.81	43.62	42	45	48.25	32	2	17/8	0.56
44	54.5	5.5	5.5	9.18	45.62	44	47.25	50.5	32	21/8	2	0.56
46	56.75	5.75	5.75	9.62	47.75	46	49.5	52.75	36	21/8	2	0.56
48	59.5	6	6	10.12	49.88	48	51.5	55.25	28	23/8	21/4	0.56
50	61.75	6.19	6.25	10.56	52	50	53.62	57.5	32	23/8	21/4	0.56
52	63.75	6.38	6.44	10.88	54	52	55.62	59.5	32	23/8	21/4	0.56
54	67	6.69	6.75	11.38	56.12	54	57.88	62.25	28	25/8	21/2	0.56
56	69	6.88	6.94	11.75	58.25	56	60.12	64.25	32	25/8	21/2	0.56
58	71	7	7.12	12.06	60.25	58	62.12	66.25	32	25/8	21/2	0.56
60	74.25	7.31	7.44	12.56	62.38	60	64.38	69	32	27/8	23/4	0.56

ANSI B16.47 Series A Class 600 Flange Dimension

Nominal Size	Outside Diameter(OD)	Min. Thickness [Note1] – WNF (tf)	Min. Thickness [Note1] – Blind (tf)	Length Through Hub (Y)	Hub Dia. Base [Note2] (X)	Hub Dia. Top (A	Raised Face Dia. (R)	Drilling – Bolt Circle Dia	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	Min. Fillet Radius（r1)
26	40	4.25	4.94	8.75	29.44	26	29.5	36	28	2	17/8	0.5
28	42.25	4.38	5.19	9.25	31.62	28	31.5	38	28	21/8	2	0.5
30	44.5	4.5	5.5	9.75	33.94	30	33.75	40.25	28	21/8	2	0.5
32	47	4.62	5.81	10.25	36.12	32	36	42.5	28	23/8	21/4	0.5
34	49	4.75	6.06	10.62	38.31	34	38	44.5	28	23/8	21/4	0.56
36	51.75	4.88	6.38	11.12	40.62	36	40.25	47	28	25/8	21/2	0.56
38	50	6	6.12	10	40.25	38	41.5	45.75	28	23/8	21/4	0.56
40	52	6.25	6.38	10.38	42.25	40	43.75	47.75	32	23/8	21/4	0.56
42	55.25	6.62	6.75	11	44.38	42	46	50.5	28	25/8	21/2	0.56
44	57.25	6.81	7	11.38	46.5	44	48.25	52.5	32	25/8	21/2	0.56
46	59.5	7.06	7.31	11.81	48.62	46	50.25	54.75	32	25/8	21/2	0.56
48	62.75	7.44	7.69	12.44	50.75	48	52.5	57.5	32	27/8	23/4	0.56
50	65.75	7.75	8	12.94	52.88	50	54.5	60	28	31/8	3	0.56
52	67.75	8	8.25	13.25	54.88	52	56.5	62	32	31/8	3	0.56
54	70	8.25	8.56	13.75	57	54	58.75	64.25	32	31/8	3	0.56
56	73	8.56	8.88	14.25	59.12	56	60.75	66.75	32	33/8	31/4	0.62
58	75	8.75	9.12	14.56	61.12	58	63	68.75	32	33/8	31/4	0.62
60	78.5	9.19	9.56	15.31	63.38	60	65.25	71.75	28	35/8	31/2	0.69

ASME B16.47 Series A Class 900 Flange Dimensions

Nominal Size	Outside Diameter(OD)	Min. Thickness [Note1] – WNF (tf)	Min. Thickness [Note1] – Blind (tf)	Length Through Hub (Y)	Hub Dia. Base [Note2] (X)	Hub Dia. Top (A	Raised Face Dia. (R)	Drilling – Bolt Circle Dia	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	Min. Fillet Radius（r1)
26	42.75	5.5	6.31	11.25	30.5	26	29.5	37.5	20	27/8	23/4	0.44
28	46	5.62	6.75	11.75	32.75	28	31.5	40.25	20	31/8	3	0.5
30	48.5	5.88	7.18	12.25	35	30	33.75	42.75	20	31/8	3	0.5
32	51.75	6.25	7.62	13	37.25	32	36	45.5	20	33/8	31/4	0.5
34	55	6.5	8.06	13.75	39.62	34	38	48.25	20	35/8	31/2	0.56
36	57.5	6.75	8.44	14.25	41.88	36	40.25	50.75	20	35/8	31/2	0.56
38	57.5	7.5	8.5	13.88	42.25	38	43.25	50.75	20	35/8	31/2	0.75
40	59.5	7.75	8.81	14.31	44.38	40	45.75	52.75	24	35/8	31/2	0.81
42	61.5	8.12	9.12	14.62	46.31	42	47.75	54.75	24	35/8	31/2	0.81
44	64.88	8.44	9.56	15.38	48.62	44	50	57.62	24	37/8	33/4	0.88
46	68.25	8.88	10.06	16.18	50.88	46	52.5	60.5	24	41/8	4	0.88
48	70.25	9.19	10.38	16.5	52.88	48	54.5	62.5	24	41/8	4	0.94

Flanges ASME B16.47 – Weights

Flange ASME B16.47-A (MSS SP 44)
NPS SIZE	CLASS 150		CLASS 300		CLASS 600		CLASS 900
NPS SIZE	WELDING NECK	BLIND	WELDING NECK	BLIND	WELDING NECK	BLIND	WELDING NECK	BLIND
22	109	162	204	284	310	437
26	154	321	291	477	450	777	890	1100
28	175	380	352	584	506	909	1055	1350
30	204	450	405	685	575	1074	1230	1610
32	254	560	465	793	642	1253	1480	1940
34	273	625	523	919	705	1427	1750	2310
36	321	760	580	1072	800	1665	1997	2660
38	358	830	324	900	674	1509	2000	2690
40	386	925	391	1066	725	1695	2161	2950
42	442	1080	428	1206	895	2028	2379	3280
44	491	1230	485	1378	951	2246	3321	3810
46	525	1345	559	1570	1055	2543	3224	4430
48	580	1520	597	1745	1247	2951	3500	4860
50	624	1668	674	1983	1423	3381
52	689	1867	728	2194	1493	3682
54	760	2088	871	2538	1637	4091
56	845	2308	921	2728	1843	4585
58	923	2554	968	2975	1954	4986
60	971	2765	1032	3250	2353	5750

Weight in “Kg”

ASME B16.47 Series A Flange Dimension download

Welding Neck Flanges	Blind Flanges
ASME B16.47 Series A Class 150 Welding Neck Flanges	ASME B16.47 Series A Class 150 Blind Flanges
ASME B16.47 Series A Class 300	ASME B16.47 Series A Class 300 Blind Flanges
ASME B16.47 Series A Class 400	ASME B16.47 Series A Class 400 Blind Flanges
ASME B16.47 Series A Class 600	ASME B16.47 Series A Class 600 Blind Flanges
ASME B16.47 Series A Class 900	ASME B16.47 Series A Class 900 Blind Flanges

Example Product Designation

ASME B16.47 Series A Weld Neck Flange  
NPS 42" Class 600 RF  
Material: ASTM A182 F316L  
Qty: 6 pcs  
Certificate: EN 10204 3.1

Download ASME B16.47 2025 Standard latest edition