Large Diameter Flanges | ASME B16.47 | Up to 110 Inch

PM Industries manufactures, supplies, and stocks Large Diameter Flanges in pipe sizes from DN600 (NPS 24) through DN1500 (NPS 60) and larger, across a range of materials, pressure classes, and flange types. Large diameter flanges require different manufacturing considerations than standard-range flanges. The forging or plate-cutting processes used to produce them, the machining tolerances required to maintain flat sealing faces across wide diameters, and the flatness of the sealing surface all become more challenging as size increases. Getting those right is what determines whether a large-diameter flanged joint seals and holds under pressure in service.

Large diameter flanges are supplied to ASME B16.47 Series A (MSS SP-44) and Series B (API 605) standards, which cover sizes from NPS 26 through NPS 60. For sizes within the ASME B16.5 range through NPS 24, standard flange dimensions apply. Above NPS 24, B16.47 governs in most process and pipeline applications. Knowing which series applies to the project is important, since Series A and Series B flanges are not interchangeable in bolt pattern or dimensions at the same nominal size.

Sealing face quality is more critical at large diameters than at standard sizes. A flatness deviation that would have negligible effect on a DN50 flange joint can cause a significant leak path across a DN900 joint. PM Industries holds machined face flatness and surface finish to applicable ASME tolerances across the full diameter, which is the baseline requirement for reliable gasket compression and joint integrity on large-bore connections.

Material availability matters more at large diameters because not all material grades are readily available in the billet or plate sizes needed to produce large diameter flanges. Carbon steel and standard stainless grades are generally available in the sizes needed. Higher-alloy grades, including duplex stainless and nickel alloys in large diameters, are specialty items with longer lead times. PM Industries manages that supply chain for clients who need large-bore corrosion-resistant flanges for offshore, chemical, and industrial applications.

Large diameter flanges are available with full material certification to ASTM, ASME, and applicable specifications including NACE MR0175 for sour service. Contact PM Industries for size, standard series, material grade, pressure class, face type, and pricing.

Specification Large Diameter Flanges

Standards	ANSI/ASME B16.5, B16.48, GOST, DIN, EN-1092, B16.47 Series A & B, AWWA, BS Flanges
JIS Standard	5K, 10K, 16K, 20K, 30K, 40K, 63K
DIN Flanges	DIN 2527, 2627, 2631, 2656, 2576, 2673, 2629, 2628, 2566

Flanges are Available in Following Materials

Stainless Steel	SS 201, SS 202, SS 301, SS 304, SS 304L, SS 310, SS 310S, SS 316L, SS 316TI, SS 317, SS 317L, SS 321, SS 347, SS 409, SS 409M, SS 409L, SS 410, SS 410S, SS 420, SS 430, SS 431, SS 441, SS 444, SS 446, SS 17-4PH, SS 904L.
Duplex Steel	UNS S32205, UNS S31803 Flange
Super Duplex Steel	UNS S32750, UNS S32760 Flanges
Carbon Steel	Carbon steel A105 Flanges, A36 Flanges, IS 2062 Flanges, A350 LF2 Flanges, F42 Flanges, F52 Flanges, F56 Flanges, F60 Flanges, F65 Flanges, F70 Flanges, F80 Flanges, IBR flanges, A694 Flanges, SS400, SF440, ST37-2 Flanges, S235JrG2 Flanges, P250GH Flanges, C22.8 Flanges, etc.
Alloys Steel	Alloy 20, F1, F5, F9, F11, F22, F91 Flanges
Copper Alloys	Cu-Ni 70/30, Cu-Ni 90/10, C 24000, C 75700, C 51100, C 22000, C 27200, C 21000, C 26800, C 52100, C 77000, C 52000, C 11000, C 74500, C 23000, C 28000, C 12200, C 76400, C 51900, C 75400, C 26000, C 51000, C 10200, C 27000
Nickel Alloys	Nickel 200, 201
Inconel	Inconel 600, 601, 625, 718, 800, 825, X-750
Monel	Monel 400, k500
Hastelloy	Hastelloy C-22, C-276, C-4, X
Titanium	Grade 1, 4, 5(Ti 6Al-4V), 6(Ti 5Al-2.5Sn), 7, 11, 6Al-2Sn-4Zr-2Mo, Grade 12, 6Al-6V-25n, Grade 23(Ti 6AL-4V ELI), 8Ai-1Mo-1V, Grade 5 ELI, Grade 9(3Al-2.5V), 6Al-7Nb.
Aluminium	6063, 1100, 6082 A96082, 1050, 2017, 2024 A92024, 7050 A97050, 5083 A95083, 2014A A92014, 2011 A92011, 6061 A96061 A86061, 5754, 7085, 2050, 7071 7020, 7178, 5052 A95052, 7150, 7075 A97075 A87075, 7575, 2219, 7175
Pressure Rating	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Types	Threaded, Plate, Screwed, Forged.
Supporting material	Gasket, Ring Joint, Flange Bolts
Size range	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
High Temperature	Above 200°C (400°F) For Class 150 Or Above 400°C (750°F)
Low Temperature	Above -29 Degree C (−20°F)
Production technique	Forged, machined and Heat treated
Custom design	As per your drawing
Origin	Indian / USA / Korean / West Europe / Japan
Pressure Class	PN 6 TO PN 100
Coating/Surface Treatment:	Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized.
European/African/Russian Standard Flanges	Available
Test	Direct-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine.
Marking Standard	Name of Manufacturer
	Schedule
	Type of Flange Facing
	Pressure Class
	Nominal Pipe Size, etc
Test Certificates	EN 10204/3.1B, NACE MR0103, NACE MR0175
	Raw Materials Certificate
	100% Radiography Test Report
	Third Party Inspection Report, etc

Class 150 Slip On Flange Dimensions In Mm

NPS	(OD)	Minimum Thickness WNF (tf)	Minimum Thickness Blind (tf)	Length Through Of Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Diameter Top (A)	RF Diameter (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	34.25	2.63	2.63	4.69	26.62	26.00	29.50	31.75	24	13\8	11\4	0.38
28	36.50	2.75	2.75	4.88	28.62	28.00	31.50	34.00	28	13⁄8	11⁄4	0.44
30	38.75	2.88	2.88	5.32	30.75	30.00	33.75	36.00	28	13⁄8	11⁄4	0.44
32	41.75	3.13	3.13	5.63	32.75	32.00	36.00	38.50	28	15⁄8	11⁄2	0.44
34	43.75	3.19	3.19	5.82	34.75	34.00	38.00	40.50	32	15⁄8	11⁄2	0.50
36	46.00	3.50	3.50	6.13	36.75	36.00	40.25	42.75	32	15⁄8	11⁄2	0.50
38	48.75	3.38	3.38	6.13	39.00	38.00	42.25	45.25	32	15⁄8	11⁄2	0.50
40	50.75	3.50	3.50	6.38	41.00	40.00	44.25	47.25	36	15⁄8	11⁄2	0.50
42	53.00	3.75	3.75	6.69	43.00	42.00	47.00	49.50	36	15⁄8	11⁄2	0.50
44	55.25	3.94	3.94	6.94	45.00	44.00	49.00	51.75	40	15⁄8	11⁄2	0.50
46	57.25	4.00	4.00	7.25	47.12	46.00	51.00	53.75	40	15⁄8	11⁄2	0.50
48	59.50	4.19	4.19	7.50	49.12	48.00	53.50	56.00	44	15⁄8	11⁄2	0.50
50	61.75	4.32	4.32	7.94	51.25	50.00	55.50	58.25	44	17⁄8	13⁄4	0.50
52	64.00	4.50	4.50	8.19	53.25	52.00	57.50	60.50	44	17⁄8	13⁄4	0.50
54	66.25	4.69	4.69	8.44	55.25	54.00	59.50	62.75	44	17⁄8	13⁄4	0.50
56	68.75	4.82	4.82	8.94	57.38	56.00	62.00	65.00	48	17⁄8	13⁄4	0.50
58	71.00	5.00	5.00	9.19	59.38	58.00	64.00	67.25	48	17⁄8	13⁄4	0.50
60	73.00	5.13	5.13	9.38	61.38	60.00	66.00	69.25	52	17⁄8	13⁄4	0.50

ASME B16.47 Series A Class 300 Flange Dimensions

NPS	(OD)	Minimum Thickness [Note1] WNF (tf)	Minimum Thickness [Note1] Blind (tf)	Length Through Of Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Diameter Top (A)	RF Diameter (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	38.25	3.07	3.25	7.19	28.38	26.00	29.50	34.50	28	13⁄4	15⁄8	0.38
28	40.75	3.32	3.50	7.69	30.50	28.00	31.50	37.00	28	13⁄4	15⁄8	0.44
30	43.00	3.57	3.69	8.19	32.56	30.00	33.75	39.25	28	17⁄8	13⁄4	0.44
32	45.25	3.82	3.88	8.69	34.69	32.00	36.00	41.50	28	2	17⁄8	0.44
34	47.50	3.94	4.07	9.07	36.88	34.00	38.00	43.50	28	2	17⁄8	0.50
36	50.00	4.07	4.32	9.44	39.00	36.00	40.25	46.00	32	21⁄8	2	0.50
38	46.00	4.19	4.19	7.06	39.12	38.00	40.50	43.00	32	15⁄8	11⁄2	0.50
40	48.75	4.44	4.44	7.56	41.25	40.00	42.75	45.50	32	13⁄4	15⁄8	0.50
42	50.75	4.63	4.63	7.82	43.25	42.00	44.75	47.50	32	13⁄4	15⁄8	0.50
44	53.25	4.82	4.82	8.06	45.25	44.00	47.00	49.75	32	17⁄8	13⁄4	0.50
46	55.75	5.00	5.00	8.44	47.38	46.00	49.00	52.00	28	2	17⁄8	0.50
48	57.75	5.19	5.19	8.75	49.38	48.00	51.25	54.00	32	2	17⁄8	0.50
50	60.25	5.44	5.44	9.07	51.38	50.00	53.50	56.25	32	21⁄8	2	0.50
52	62.25	5.63	5.63	9.32	53.38	52.00	55.50	58.25	32	21⁄8	2	0.50
54	65.25	5.94	5.94	9.88	55.50	54.00	57.75	61.00	28	23⁄8	21⁄4	0.50
56	67.25	6.00	6.00	10.19	57.62	56.00	59.75	63.00	28	23⁄8	21⁄4	0.50
58	69.25	6.19	6.19	10.44	59.62	58.00	62.00	65.00	32	23⁄8	21⁄4	0.50
60	71.25	6.38	6.38	10.69	61.62	60.00	64.00	67.00	32	23⁄8	21⁄4	0.50

>

ASME B16.47 Series A Class 400 Flange Dimension

NPS	Outside Diameter (OD)	Minimum Thickness [Note1] – WNF (tf)	Minimum Thickness [Note1] – Blind (tf)	Length Through Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Dia. Top (A)	Raised Face Dia. (R)	Drilling – Bolt Circle Diameter	Drilling- Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	38.25	3.50	3.88	7.62	28.62	26.00	29.50	34.50	28	178	134	0.44
28	40.75	3.75	4.12	8.12	30.81	28.00	31.50	37.00	28	2	178	0.50
30	43.00	4.00	4.38	8.62	32.94	30.00	33.75	39.25	28	218	2	0.50
32	45.25	4.25	4.56	9.12	35.00	32.00	36.00	41.50	28	218	2	0.50
34	47.50	4.38	4.81	9.50	37.19	34.00	38.00	43.50	28	218	2	0.56
36	50.00	4.50	5.06	9.88	39.38	36.00	40.25	46.00	32	218	2	0.56
38	47.50	4.88	4.88	8.12	39.50	38.00	40.75	44.00	32	178	134	0.56
40	50.00	5.12	5.12	8.50	41.50	40.00	43.00	46.25	32	2	178	0.56
42	52.00	5.25	5.25	8.81	43.62	42.00	45.00	48.25	32	2	178	0.56
44	54.50	5.50	5.50	9.18	45.62	44.00	47.25	50.50	32	218	2	0.56
46	56.75	5.75	5.75	9.62	47.75	46.00	49.50	52.75	36	218	2	0.56
48	59.50	6.00	6.00	10.12	49.88	48.00	51.50	55.25	28	238	214	0.56
50	61.75	6.19	6.25	10.56	52.00	50.00	53.62	57.50	32	238	214	0.56
52	63.75	6.38	6.44	10.88	54.00	52.00	55.62	59.50	32	238	214	0.56
54	67.00	6.69	6.75	11.38	56.12	54.00	57.88	62.25	28	258	212	0.56
56	69.00	6.88	6.94	11.75	58.25	56.00	60.12	64.25	32	258	212	0.56
58	71.00	7.00	7.12	12.06	60.25	58.00	62.12	66.25	32	258	212	0.56
60	74.25	7.31	7.44	12.56	62.38	60.00	64.38	69.00	32	278	234	0.56

ASME B16.47 Series A Class 600 Flange Dimensions

Normal Pipe Size Of Flange	Outside Diameter	Min. Thickness Of		Outside Daimeter of Raised Face	Hub Daimeter	Length Thru Hub	Approx. Weight Table In (lbs)		Drilling
		WN Flange	BLRF Flange			WN Flange	WN Flange	BLRF Flange	Number Holes	Diameter Holes	Bolt Circle Diameter
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

ASME B16.47 Series A Class 900 Flange Dimensions

NPS	Outside Diameter (OD)	Minimum Thickness [Note1] – WNF (tf)	Minimum Thickness [Note1] – Blind (tf)	Length Through Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Dia. Top (A)	Raised Face Dia. (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	42.75	5.50	6.31	11.25	30.50	26.00	29.50	37.50	20	278	234	0.44
28	46.00	5.62	6.75	11.75	32.75	28.00	31.50	40.25	20	318	3	0.50
30	48.50	5.88	7.18	12.25	35.00	30.00	33.75	42.75	20	318	3	0.50
32	51.75	6.25	7.62	13.00	37.25	32.00	36.00	45.50	20	338	314	0.50
34	55.00	6.50	8.06	13.75	39.62	34.00	38.00	48.25	20	358	312	0.56
36	57.50	6.75	8.44	14.25	41.88	36.00	40.25	50.75	20	358	312	0.56
38	57.50	7.50	8.50	13.88	42.25	38.00	43.25	50.75	20	358	312	0.75
40	59.50	7.75	8.81	14.31	44.38	40.00	45.75	52.75	24	358	312	0.81
42	61.50	8.12	9.12	14.62	46.31	42.00	47.75	54.75	24	358	312	0.81
44	64.88	8.44	9.56	15.38	48.62	44.00	50.00	57.62	24	378	334	0.88
46	68.25	8.88	10.06	16.18	50.88	46.00	52.50	60.50	24	418	4	0.88
48	70.25	9.19	10.38	16.50	52.88	48.00	54.50	62.50	24	41⁄8	4	0.94

ASME B16.47 Series B Class 150 Flange Dimenisons

NPS	(OD)	Minimum Thickness [Note1] WNF (tf)	Minimum Thickness [Note1] Blind (tf)	Length Through Of Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Diameter Top (A)	RF Diameter (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	30.94	1.57	1.69	3.44	26.94	26.06	28.00	29.31	36	7\8	3\4	0.38
28	32.94	1.69	1.82	3.69	28.94	28.06	30.00	31.31	40	7\8	3\4	0.38
30	34.94	1.69	1.94	3.88	31.00	30.06	32.00	33.31	44	7\8	3\4	0.38
32	37.06	1.75	2.07	4.19	33.06	32.06	34.00	35.44	48	7\8	3\4	0.38
34	39.56	1.88	2.19	4.28	35.12	34.06	36.25	37.69	40	1	7\8	0.38
36	41.62	2.00	2.25	4.57	37.19	36.06	38.25	39.75	44	1	7\8	0.38
38	44.25	2.07	2.44	4.82	39.25	38.12	40.25	42.12	40	11\8	1	0.38
40	46.25	2.13	2.57	5.00	41.31	40.12	42.50	44.12	44	11\8	1	0.38
42	48.25	2.25	2.63	5.19	43.38	42.12	44.50	46.12	48	11\8	1	0.44
44	50.25	2.32	2.75	5.32	45.38	44.12	46.50	48.12	52	11\8	1	0.44
46	52.81	2.38	2.88	5.63	47.44	46.12	48.62	50.56	40	11\4	11\8	0.44
48	54.81	2.50	3.00	5.82	48.50	48.12	50.75	52.56	44	11\4	11\8	0.44
50	56.81	2.63	3.13	6.00	51.50	50.12	52.75	54.56	48	11\4	11\8	0.44
52	58.81	2.69	3.25	6.13	53.56	52.12	54.75	56.56	52	11\4	11\8	0.44
54	61.00	2.75	3.38	6.32	55.62	54.12	56.75	58.75	56	11\4	11\8	0.44
56	63.00	2.82	3.50	6.50	57.69	56.12	58.75	60.75	60	11\4	11\8	0.56
58	65.94	2.88	3.62	6.82	59.69	58.12	60.75	63.44	48	13\8	11\4	0.56
60	67.94	2.94	3.75	7.00	61.81	60.12	63.00	65.44	52	13\8	11\4	0.56

ASME B16.47 Series B Class 300 Flange Dimenisons

NPS	(OD)	Minimum Thickness [Note1] WNF (tf)	Minimum Thickness [Note1] Blind (tf)	Length Through Of Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Diameter Top (A)	RF Diameter (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	34.12	3.44	3.44	5.63	27.62	26.19	29.00	31.62	32	13\8	11\4	0.56
28	36.25	3.44	3.44	5.81	29.75	28.19	31.00	33.75	36	13\8	11\4	0.56
30	39.00	3.63	3.63	6.16	32.00	30.25	33.25	36.25	36	11\2	13\8	0.56
32	41.50	4.00	4.00	6.56	34.00	32.35	35.50	38.50	32	15\8	11\2	0.62
34	43.62	4.00	4.00	6.75	36.12	34.25	37.50	40.62	36	15\8	11\2	0.62
36	46.12	4.00	4.00	7.06	38.00	36.25	39.75	42.88	32	13\4	15\8	0.62
38	48.12	4.31	4.31	7.50	40.00	38.25	41.75	44.88	36	13\4	15\8	0.62
40	50.12	4.50	4.50	7.75	42.00	40.25	43.88	46.88	40	13\4	15\8	0.62
42	52.50	4.63	4.63	8.00	44.00	42.31	46.00	49.00	36	17\8	13\4	0.62
44	54.50	4.94	4.94	8.38	46.19	44.31	48.00	51.00	40	17\8	13\4	0.62
46	57.50	5.00	5.06	8.69	48.38	46.31	50.00	53.75	36	2	17\8	0.62
48	59.50	5.00	5.25	8.75	50.31	48.31	52.25	55.75	40	2	17\8	0.62
50	61.50	5.38	5.44	9.19	52.38	50.31	54.25	57.75	44	2	17\8	0.62
52	63.50	5.56	5.61	9.50	54.44	52.31	56.25	59.75	48	2	17\8	0.62
54	65.88	5.32	5.81	9.38	56.50	54.31	58.25	62.12	48	2	17\8	0.62
56	69.50	6.00	6.12	10.50	58.81	56.31	60.50	65.00	36	23\8	21\4	0.69
58	71.94	6.00	6.31	10.75	60.94	58.31	62.75	67.44	40	23\8	21\4	0.69
60	73.94	5.88	6.50	10.63	62.94	60.31	65.00	69.44	40	23\8	21\4	0.69

ASME B16.47 Series B Class 400 Flange Dimenisons

NPS	(OD)	Minimum Thickness [Note1] WNF (tf)	Minimum Thickness [Note1] Blind (tf)	Length Through Of Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Diameter Top (A)	RF Diameter (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	33.50	3.50	3.50	5.88	27.12	26.00	28.00	30.75	28	11\2	13\8	0.44
28	36.00	3.75	3.75	6.25	29.12	28.00	30.00	33.00	24	15\8	11\2	0.50
30	38.25	4.00	4.00	6.69	31.25	30.00	32.25	35.25	28	15\8	11\2	0.50
32	40.75	4.25	4.25	7.06	33.25	32.00	34.38	37.50	28	13\4	15\8	0.50
34	42.75	4.38	4.38	7.38	35.38	34.00	36.50	39.50	32	13\4	15\8	0.56
36	45.50	4.69	4.69	7.88	37.50	36.00	38.62	42.00	28	17\8	13\4	0.56
38	47.50	4.88	4.88	8.12	39.50	38.00	40.75	44.00	32	17\8	13\4	0.56
40	50.00	5.12	5.12	8.50	41.50	40.00	43.00	46.25	32	2	17\8	0.56
42	52.00	5.25	5.25	8.81	43.62	42.00	45.00	48.25	32	2	17\8	0.56
44	54.50	5.50	5.50	9.18	45.62	44.00	47.25	50.50	32	21\8	2	0.56
46	56.75	5.75	5.75	9.62	47.75	46.00	49.50	52.75	36	21\8	2	0.56
48	59.50	6.00	6.00	10.12	49.88	48.00	51.50	55.25	28	23\8	21\4	0.56
50	61.75	6.19	6.25	10.56	52.00	50.00	53.62	57.50	32	23\8	21\4	0.56
52	63.75	6.38	6.44	10.88	54.00	52.00	55.62	59.50	32	23\8	21\4	0.56
54	67.00	6.69	6.75	11.38	56.12	54.00	57.88	62.25	28	25\8	21\2	0.56
56	69.00	6.88	6.94	11.75	58.25	56.00	60.12	64.25	32	25\8	21\2	0.56
58	71.00	7.00	7.12	12.06	60.25	58.00	62.12	66.25	32	25\8	21\2	0.56
60	74.25	7.31	7.44	12.56	62.38	60.00	64.38	69.00	32	27\8	23\4	0.56

ASME B16.47 Series B Class 600 Flange Dimenisons

NPS	(OD)	Minimum Thickness [Note1] WNF (tf)	Minimum Thickness [Note1] Blind (tf)	Length Through Of Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Diameter Top (A)	RF Diameter (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	35.00	4.38	4.38	7.12	27.50	26.00	28.62	31.75	28	13\4	15\8	0.50
28	37.50	4.56	4.56	7.50	29.62	28.00	30.88	34.00	28	17\8	13\4	0.50
30	40.25	4.94	5.00	8.06	31.75	30.00	33.12	36.50	28	2	17\8	0.50
32	42.75	5.12	5.31	8.50	33.88	32.00	35.25	38.75	28	21\8	2	0.50
34	45.75	5.56	5.68	9.19	36.00	34.00	37.50	41.50	24	23\8	21\4	0.56
36	47.75	5.75	5.94	9.56	38.12	36.00	39.75	43.50	28	23\8	21\4	0.56
38	50.00	6.00	6.12	10.00	40.25	38.00	41.50	45.75	28	23\8	21\4	0.56
40	52.00	6.25	6.38	10.38	42.25	40.00	43.75	47.75	32	23\8	21\4	0.56
42	55.25	6.62	6.75	11.00	44.38	42.00	46.00	50.50	28	25\8	21\2	0.56
44	57.25	6.81	7.00	11.38	46.50	44.00	48.25	52.50	32	25\8	21\2	0.56
46	59.50	7.06	7.31	11.81	48.62	46.00	50.25	54.75	32	25\8	21\2	0.56
48	62.75	7.44	7.69	12.44	50.75	48.00	52.25	57.50	32	27\8	23\4	0.56
50	65.75	7.75	8.00	12.94	52.88	50.00	54.50	60.00	28	31\8	3	0.56
52	67.75	8.00	8.25	13.25	54.88	52.00	56.50	62.00	32	31\8	3	0.56
54	70.00	8.25	8.56	13.75	57.00	54.00	58.75	64.25	32	31\8	3	0.56
56	73.00	8.56	8.88	14.25	59.12	56.00	60.75	66.75	32	33\8	31\4	0.62
58	75.00	8.75	9.12	14.56	61.12	58.00	63.00	68.75	32	33\8	31\4	0.62
60	78.50	9.19	9.56	15.31	63.38	60.00	65.25	71.75	28	35\8	31\2	0.69

ASME B16.47 Series B Class 900 Flange Dimenisons

NPS	(OD)	Minimum Thickness [Note1] WNF (tf)	Minimum Thickness [Note1] Blind (tf)	Length Through Of Hub (Y)	Hub Diameter Base [Note2] (X)	Hub Diameter Top (A)	RF Diameter (R)	Drilling – Bolt Circle Diameter	Drilling – Number of Bolt Holes	Drilling – Diameter of Bolt Hole	Diameter of Bolt	Minimum Fillet Radius (r1)
26	40.25	5.31	6.06	10.19	29.25	26.00	30.00	35.50	20	25\8	21\2	0.44
28	43.50	5.81	6.56	10.88	31.38	28.00	32.25	38.25	20	27\8	23\4	0.50
30	46.50	6.12	6.93	11.38	33.50	30.00	34.50	40.75	20	31\8	3	0.50
32	48.75	6.31	7.31	11.94	35.75	32.00	36.50	43.00	20	31\8	3	0.50
34	51.75	6.75	7.68	12.56	37.88	34.00	39.00	45.50	20	33\8	31\4	0.56
36	53.00	6.81	7.94	12.81	40.00	36.00	40.50	47.25	24	31\8	3	0.56
38	57.50	7.50	8.50	13.88	42.25	38.00	43.25	50.75	20	35\8	31\2	0.75
40	59.50	7.75	8.81	14.31	44.38	40.00	45.75	52.75	24	35\8	31\2	0.81
42	61.50	8.12	9.12	14.62	46.31	42.00	47.75	54.75	24	35\8	31\2	0.81
44	64.88	8.44	9.56	15.38	48.62	44.00	50.00	57.62	24	37\8	33\4	0.88
46	68.25	8.88	10.06	16.18	50.88	46.00	52.50	60.50	24	41\8	4	0.88
48	70.25	9.19	10.38	16.50	52.88	48.00	54.50	62.50	24	41\8	4	0.94

ASME B16.47 Tolerances

Outside Daimeter	±0.12″	±3.2millimeter
The dia. of Flange Face	0.06″ (1.66millimeter) rf	±0.08″	±2.0millimeter
0.25″ (6.44millimeter) rf	±0.04″
er of The dia. of the Hub at the Point of Welding	±0.21″, -0.06″	±5.5millimeter, -1.6millimeter
Inside Daimeter	±0.12″, -0.06″	±3.2millimeter, -1.6millimeter
Thickness	Up to 1.0″ Thickness	±0.12″, -0.00″	±3.2millimeter, -0.00millimeter
1.0″ to 2.0″	±0.19″, -0.00″	±4.8millimeter, -0.00millimeter
2.0″ to 3.0″	±0.31″, -0.00″	±7.9millimeter, -0.00millimeter
Over 3.0′ Thickness	±0.38″, -0.00″	±9.6millimeter, -0.00millimeter
Bolts Drilling	Bolt Circle Dia.	±0.06″	±1.6millimeter
Bolt Hole Spacing	±0.03″	±0.8millimeter
The eccentricity of the Circle Of Bolt and Facing vs. Bore	±0.06″	±1.6millimeter
Length Through Hub for Weld Neck Flanges	±0.19″	±4.8millimeter

ANSI B16.47 Pressure Ratings

ASME B16.47 Pressure Pressure
Temperature (°C)	Class
	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-29 - 38	19.8	51.7	68.9	103.4	155	259	431
50	19.5	51.7	68.9	103.4	155	259	431
100	17.7	51.5	68.7	103.0	155	258	429
150	15.8	50.2	66.8	100.3	151	251	418
200	13.8	48.6	64.8	97.2	146	243	405
250	12.1	46.3	61.7	92.7	139	232	386
300	10.2	42.9	57.0	85.7	129	214	357
325	9.3	41.4	55.0	82.6	124	207	344
350	8.4	40.0	53.4	80.0	120	200	334
375	7.4	37.8	50.4	75.7	114	189	315
400	6.5	34.7	46.3	69.4	104	174	290
425	5.5	28.8	38.4	57.5	86.3	144	240
450	4.6	23.0	30.7	46.0	69.0	115	192
475	3.7	17.1	22.8	34.2	51.3	85.4	142
500	2.8	11.6	15.4	23.2	34.7	57.9	96.5
538	1.4	5.9	7.9	11.8	17.7	29.5	49.2

ASME B16 47 Series A Flange Weight

Nominal Pipe Sizes (NPS)	Slip On (SORF)	Threaded (NPT)	Socket Weld (SWRF)	Lap Joint (Loose)	Blind (BLRF)	Weld Neck (WRNR)
½	1	1	2	1	2	2
¾	2	2	2	2	2	2
1	2	2	2	2	2	3
1¼	3	3	3	3	3	3
1½	3	3	3	3	4	4
2	5	5	5	5	5	6
2½	8	8	8	8	7	10
3	9	9	9	9	9	11.5
3½	11	12	11	11	13	12
4	13	13	13	13	17	16.5
5	15	15	15	15	20	21
6	19	19	19	19	27	26
8	30	30	30	30	47	42
10	43	43	43	43	70	54
12	64	64	64	64	123	88
14	90	90	90	105	140	114
16	106	98	98	140	180	140
18	130	130	130	160	220	165
20	165	165	165	195	285	197
22	185	185	185	245	355	225
24	220	220	220	275	430	268

Large Diameter Pipe Flanges Thickness Calculation

ANSI B16.5 Flanges Wall Thickness
NPS (Normal Pipe Sizes)	Outside Daimeter (O.D.)	Schedule 10	Schedule 20	Schedule 30	STD Wall	Schedule 40	Schedule 60	EXT Hvy	Schedule 80	Schedule 100	Schedule 120	Schedule 140	Schedule 160	XX Hvy
½	0.84	0.083	...	...	0.109	0.109	...	0.147	0.147	...	...	...	0.188	0.294
¾	1.05	0.083	...	...	0.113	0.113	...	0.154	0.154	...	...	...	0.219	0.308
1	1.315	0.109	...	...	0.133	0.133	...	0.179	0.179	...	...	...	0.25	0.358
1 ¼	1.66	0.109	...	...	0.14	0.14	...	0.191	0.191	...	...	...	0.25	0.382
1 ½	1.9	0.109	...	...	0.145	0.145	...	0.2	0.2	...	...	...	0.281	0.4
2	2.375	0.109	...	...	0.154	0.154	...	0.218	0.218	...	...	...	0.344	0.436
2 ½	2.875	0.12	...	...	0.203	0.203	...	0.276	0.276	...	...	...	0.375	0.552
3	3.5	0.12	...	...	0.216	0.216	...	0.3	0.3	...	...	...	0.438	0.6
3 ½	4	0.12	...	...	0.226	0.226	...	0.318	0.318	...	...	...	...	0.636
4	4.5	0.12	...	...	0.237	0.237	...	0.337	0.337	...	0.438	...	0.531	0.674
5	5.563	0.134	...	...	0.258	0.258	...	0.375	0.375	...	0.5	...	0.625	0.75
6	6.625	0.134	...	...	0.28	0.28	...	0.432	0.432	...	0.562	...	0.719	0.864
8	8.625	0.148	0.25	0.277	0.322	0.322	0.406	0.5	0.5	0.594	0.719	0.812	0.906	0.875
10	10.75	0.165	0.25	0.307	0.365	0.365	0.5	0.5	0.594	0.719	0.844	1	1.125	1
12	12.75	0.18	0.25	0.33	0.375	0.406	0.562	0.5	0.688	0.844	1	1.125	1.312	1
14	14	0.25	0.312	0.375	0.375	0.438	0.594	0.5	0.75	0.938	1.094	1.25	1.406	...
16	16	0.25	0.312	0.375	0.375	0.5	0.656	0.5	0.844	1.031	1.219	1.438	1.594	...
18	18	0.25	0.312	0.438	0.375	0.562	0.75	0.5	0.938	1.156	1.375	1.562	1.781	...
20	20	0.25	0.375	0.5	0.375	0.594	0.812	0.5	1.031	1.281	1.5	1.75	1.969	...
22	22	0.25	...	...	0.375	...	...	0.5	...	...	....	....	....	....
24	24	0.25	0.375	0.562	0.375	0.688	0.969	0.5	1.219	1.531	1.812	2.062	2.344	....
26	26	....	....	....	0.375	....	....	0.5	....	....	....	....	....	....
30	30	0.312	0.5	0.625	0.375	....	....	0.5	....	....	....	....	....	....
36	36	0.312	0.5	0.625	0.375	0.75	....	0.5	....	....	....	....	....	....
40	40	....	....	....	0.375	....	....	0.5	....	....	....	....	....	....
42	42	……..	……..	……..	0.375	……..	……..	0.5	……..	……..	……..	……..	……..	……..
48	48	……..	……..	……..	0.375	……..	……..	0.5	……..	……..	……..	……..	……..	……..

Soft Gaskets for ASME B16.47 – Series A

Normal Pipe Size	d1 (Inside Daimeter)	d2 (Outside Diameter Of Gasket)
		Class 150	Class 300	Class 400	Class 600
26	660	775	835	832	867
28	711	832	899	892	914
30	762	883	953	946	972
32	813	940	1006	1003	1022
34	864	991	1057	1054	1073
36	914	1048	1118	1118	1130
38	965	1111	1054	1073	1105
40	1016	1162	1114	1127	1156
42	1067	1219	1165	1178	1219
44	1118	1276	1219	1232	1270
46	1168	1327	1273	1289	1327
48	1219	1384	1324	1346	1391
50	1270	1435	1378	1403	1448
52	1321	1492	1429	1454	1499
54	1372	1549	1492	1518	1556
56	1422	1607	1543	1568	1613
58	1473	1664	1594	1619	1664
60	1524	1715	1645	1683	1721

Large Diameter Stainless Steel Flanges Bolt Chart

	Class 150 Flanges				Class 300 Flanges				Class 600 Flanges
NPS	# Bolts And Studs	Diameter of Bolts And Studs	Stud Length		# Bolts And Studs	Diameter of Bolts And Studs	Stud Length		# Bolts And Studs	Diameter of Bolts And Studs	Stud Length
			1/16 RF	RTJ			1/16 RF	RTJ			1/4 RF	RTJ
1/2	4	0.50	2-1/4	–	4	0.50	2-1/2	3	4	0.50	3	3
3/4	4	0.50	2-1/2	–	4	0.63	3	3-1/2	4	0.63	3-1/2	3-1/2
1	4	0.50	2-1/2	3	4	0.63	3	3-1/2	4	0.63	3-1/2	3-1/2
1-1/4	4	0.50	2-3/4	3-1/4	4	0.63	3-1/4	3-3/4	4	0.63	3-3/4	3-3/4
1-1/2	4	0.50	2-3/4	3-1/4	4	0.75	3-1/2	4	4	0.75	4-1/4	4-1/4
2	4	0.63	3-1/4	3-3/4	8	0.63	3-1/2	4	8	0.63	4-1/4	4-1/4
2-1/2	4	0.63	3-1/2	4	8	0.75	4	4-1/2	8	0.75	4-3/4	4-3/4
3	4	0.63	3-1/2	4	8	0.75	4-1/4	4-3/4	8	0.75	5	5
3-1/2	8	0.63	3-1/2	4	8	0.75	4-1/4	5	8	0.88	5-1/2	5-1/2
4	8	0.63	3-1/2	4	8	0.75	4-1/2	5	8	0.88	5-3/4	5-3/4
5	8	0.75	3-3/4	4-1/4	8	0.75	4-3/4	5-1/4	8	1.00	6-1/2	6-1/2
6	8	0.75	4	4-1/2	12	0.75	4-3/4	5-1/2	12	1.00	6-3/4	6-3/4
8	8	0.75	4-1/4	4-3/4	12	0.88	5-1/2	6	12	1.13	7-1/2	7-3/4
10	12	0.88	4-1/2	5	16	1.00	6-1/4	6-3/4	16	1.25	8-1/2	8-1/2
12	12	0.88	4-3/4	5-1/4	16	1.13	6-3/4	7-1/4	20	1.25	8-3/4	8-3/4
14	12	1.00	5-1/4	5-3/4	20	1.13	7	7-1/2	20	1.38	9-1/4	9-1/4
16	16	1.00	5-1/4	5-3/4	20	1.25	7-1/2	8	20	1.50	10	10
18	16	1.13	5-3/4	6-1/4	24	1.25	7-3/4	8-1/4	20	1.63	10-3/4	10-3/4
20	20	1.13	6-1/4	6-3/4	24	1.25	8	8-3/4	24	1.63	11-1/4	11-1/2
24	20	1.25	6-3/4	7-1/4	24	1.50	9	10	24	1.88	13	13-1/4