Forged Flanges | ASTM A105 | ASTM A182

PM Industries manufactures, supplies, and stocks Forged Flanges across all standard types, materials, pressure classes, and pipe sizes. Forging shapes metal under high compressive force at elevated temperature, which refines the grain structure in a way that casting cannot replicate. The result is a flange with better tensile strength, toughness, and fatigue resistance than a cast equivalent of the same material grade, with fewer internal voids and less material segregation throughout the cross-section.

That internal integrity matters for pressure-containing components. Flanges carry combined loads from internal pressure, pipe weight, thermal expansion, and mechanical forces from connected equipment. A cast component with internal porosity or segregation may perform adequately under steady-state conditions but fail under the combined dynamic loading that real piping systems experience. Forged flanges minimize those internal defect risks, which is why pressure equipment standards and major project specifications typically require or strongly prefer forged flanges for critical service.

Flange types stocked:

Weld neck flanges have a long tapered hub that transitions gradually from the flange body to the pipe wall, distributing stress at the joint and making them suitable for high-pressure, high-temperature, and cyclic service. The hub is butt-welded to the pipe, producing a full-penetration weld that can be radiographically examined. Standard specification for critical piping.

Slip-on flanges slide over the pipe and are fillet-welded inside and outside. Lower cost and easier to fit than weld neck, but with reduced strength and fatigue life. Used in moderate-pressure general service where cycling and vibration loads are limited.

Socket weld flanges accept small-diameter pipe into a socket and are fillet-welded at the outer edge. Good for small bore high-pressure piping up to DN50 (2 inches) where a full-penetration butt weld would be difficult to make and inspect.

Threaded flanges connect to threaded pipe without welding, used in low-pressure service and in systems where welding is not permitted due to fire or explosion risk.

Blind flanges close the end of a piping run, nozzle, or vessel opening. Subject to full system pressure load across their face, so mechanical integrity is critical. Forged blind flanges provide better reliability than cast in pressure service.

Lap joint flanges are used with stub end fittings, allowing the flange to rotate freely for bolt hole alignment and providing a removable connection without welding the flange directly to the pipe.

Materials available:

Carbon steel (A105, A350 LF2), alloy steel (A182 F11, F22, F91), stainless steel (304L, 316L, 321, 347), duplex stainless (2205, 2507), super austenitic (904L, 254 SMO), and nickel alloys (Inconel 625, Hastelloy C-276, Incoloy 825) across the full range of pressure classes from 150 to 2500 to ASME B16.5 and B16.47 Series A and B.

Forged flanges are available with full material certification to ASTM, ASME, EN, and applicable specifications including NACE MR0175 for sour service. Contact PM Industries for type selection, material recommendations, dimensions, and pricing.

Specification Forged Flanges Manufacturer in India

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 Forged Flanges	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 Forged Flanges	UNS S32205, UNS S31803 Flange
Super Duplex Steel Forged Flanges	UNS S32750, UNS S32760 Flanges
Carbon Steel Forged Flanges	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 Forged Flanges	Alloy 20, F1, F5, F9, F11, F22, F91 Flanges
Copper Forged Flanges	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 Forged Flanges	Nickel 200, 201
Inconel Forged Flanges	Inconel 600, 601, 625, 718, 800, 825, X-750
Monel Forged Flanges	Monel 400, k500
Hastelloy Forged Flanges	Hastelloy C-22, C-276, C-4, X
Titanium Forged Flanges	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 Forged Flanges	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 Forged Flanges Dimensions

Nom. Pipe Size	O	T	TJ	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	R	D	Thr
½	3.50	0.38	0.44	1.38	1.19	4-0.62	2.38	0.88	0.62	0.90	0.84	0.56	1.81	0.62	0.12	0.38	0.62
¾	3.88	0.44	0.50	1.69	1.50	4-0.62	2.75	1.09	0.82	1.11	1.05	0.56	2.00	0.62	0.12	0.44	0.62
1	4.25	0.50	0.56	2.00	1.94	4-0.62	3.12	1.36	1.05	1.38	1.32	0.62	2.12	0.69	0.12	0.50	0.69
1¼	4.62	0.56	0.62	2.50	2.31	4-0.62	3.50	1.70	1.38	1.72	1.66	0.75	2.19	0.81	0.19	0.56	0.81
1½	5.00	0.62	0.69	2.88	2.56	4-0.62	3.88	1.95	1.61	1.97	1.90	0.81	2.38	0.88	0.25	0.62	0.88
2	6.00	0.69	0.75	3.62	3.06	4-0.75	4.75	2.44	2.07	2.46	2.38	0.94	2.44	1.00	0.31	0.69	1.00
2½	7.00	0.81	0.88	4.12	3.56	4-0.75	5.50	2.94	2.47	2.97	2.88	1.06	2.69	1.12	0.31	0.75	1.12
3	7.50	0.88	0.94	5.00	4.25	4-0.75	6.00	3.57	3.07	3.60	3.50	1.12	2.69	1.19	0.38	0.81	1.19
3½	8.50	0.88	0.94	5.50	4.81	8-0.75	7.00	4.07	3.55	4.10	4.00	1.19	2.75	1.25	0.38	0.88	1.25
4	9.00	0.88	0.94	6.19	5.31	8-0.75	7.50	4.57	4.03	4.60	4.50	1.25	2.94	1.31	0.44	0.94	1.31
5	10.00	0.88	0.94	7.31	6.44	8-0.88	8.50	5.66	5.05	5.69	5.56	1.38	3.44	1.44	0.44	0.94	1.44
6	11.00	0.94	1.00	8.50	7.56	8-0.88	9.50	6.72	6.07	6.75	6.63	1.50	3.44	1.56	0.50	1.06	1.56
8	13.50	1.06	1.12	10.62	9.69	8-0.88	11.75	8.72	7.98	8.75	8.63	1.69	3.94	1.75	0.50	1.25	1.75
10	16.00	1.12	1.19	12.75	12.00	12-1.00	14.25	10.88	10.02	10.92	10.75	1.88	3.94	1.94	0.50	1.31	1.94
12	19.00	1.19	1.25	15.00	14.38	12-1.00	17.00	12.88	12.00	12.92	12.75	2.12	4.44	2.19	0.50	1.56	2.19
14	21.00	1.31	1.38	16.25	15.75	12-1.12	18.75	14.14	13.25	14.18	14.00	2.19	4.94	3.12	0.50	1.63	2.25
16	23.50	1.38	1.44	18.50	18.00	16-1.12	21.25	16.16	15.25	16.19	16.00	2.44	4.94	3.44	0.50	1.75	2.50
18	25.00	1.50	1.56	21.00	19.88	16-1.25	22.75	18.18	17.25	18.20	18.00	2.62	5.44	3.81	0.50	1.94	2.69
20	27.50	1.62	1.69	23.00	22.00	20-1.25	25.00	20.20	19.25	20.25	20.00	2.81	5.62	4.06	0.50	2.13	2.88
22	29.50	1.75	1.81	25.25	24.25	20-1.38	27.25	22.22	21.25	22.25	22.00	3.07	5.82	4.25	0.50	2.38	3.13
24	32.00	1.81	1.88	27.25	26.12	20-1.38	29.50	24.25	23.25	24.25	24.00	3.19	5.94	4.38	0.50	2.50	3.25

Class 300 Forged Flanges Dimension

Nom. Pipe Size	O	T	TJ	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	R	C	D	Thr
½	3.75	0.50	0.56	1.38	1.50	4-0.63	2.62	0.88	0.62	0.90	0.84	0.81	2.00	0.88	0.12	0.93	0.38	0.62
¾	4.62	0.56	0.62	1.69	1.88	4-0.75	3.25	1.09	0.82	1.11	1.05	0.94	2.19	1.00	0.12	1.14	0.44	0.62
1	4.88	0.62	0.69	2.00	2.12	4-0.75	3.50	1.36	1.05	1.38	1.32	1.00	2.38	1.06	0.12	1.41	0.50	0.69
1¼	5.25	0.69	0.75	2.50	2.50	4-0.75	3.88	1.70	1.38	1.72	1.66	1.00	2.50	1.06	0.19	1.75	0.56	0.81
1½	6.12	0.75	0.81	2.88	2.75	4-0.88	4.50	1.95	1.61	1.97	1.90	1.13	2.63	1.19	0.25	1.98	0.62	0.88
2	6.50	0.81	0.88	3.62	3.31	8-0.75	5.00	2.44	2.07	2.46	2.38	1.25	2.69	1.31	0.31	2.50	0.69	1.12
2½	7.50	0.94	1.00	4.12	3.94	8-0.88	5.88	2.94	2.47	2.97	2.88	1.44	2.94	1.50	0.31	3.00	0.75	1.25
3	8.25	1.06	1.12	5.00	4.62	8-0.88	6.62	3.57	3.07	3.60	3.50	1.63	3.06	1.69	0.38	3.63	0.81	1.25
3½	9.00	1.12	1.19	5.50	5.25	8-0.88	7.25	4.07	3.55	4.10	4.00	1.69	3.13	1.75	0.38	4.13	1.44
4	10.00	1.19	1.25	6.19	5.75	8-0.88	7.88	4.57	4.03	4.60	4.50	1.82	3.32	1.88	0.44	4.63	1.44
5	11.00	1.31	1.38	7.31	7.00	8-0.88	9.25	5.66	5.05	5.69	5.56	1.94	3.82	2.00	0.44	5.69	1.69
6	12.50	1.38	1.44	8.50	8.12	12-0.88	10.62	6.72	6.07	6.75	6.63	2.00	3.82	2.06	0.50	6.75	1.81
8	15.00	1.56	1.62	10.62	10.25	12-1.00	13.00	8.72	7.98	8.75	8.63	2.38	4.32	2.44	0.50	8.75	2.00
10	17.50	1.81	1.88	12.75	12.62	16-1.12	15.25	10.88	10.02	10.92	10.75	2.56	4.56	3.75	0.50	10.88	2.19
12	20.50	1.94	2.00	15.00	14.75	16-1.25	17.75	12.88	12.00	12.92	12.75	2.82	5.06	4.00	0.50	12.94	2.38
14	23.00	2.06	2.12	16.25	16.75	20-1.25	20.25	14.14	13.25	14.18	14.00	2.94	5.56	4.38	0.50	14.19	2.50
16	25.50	2.19	2.25	18.50	19.00	20-1.38	22.50	16.16	15.25	16.19	16.00	3.19	5.69	4.75	0.50	16.19	2.69
18	28.00	2.31	2.38	21.00	21.00	24-1.38	24.75	18.18	17.25	18.20	18.00	3.44	6.19	5.12	0.50	18.19	2.75
20	30.50	2.44	2.50	23.00	23.12	24-1.38	27.00	20.20	19.25	20.25	20.00	3.69	6.32	5.50	0.50	20.19	2.88
22	33.00	2.57	2.63	25.25	25.25	24-1.63	29.25	22.22	21.25	22.25	22.00	3.93	6.43	5.75	0.50	22.19	3.13
24	36.00	2.69	2.75	27.25	27.62	24-1.63	32.00	24.25	23.25	24.25	24.00	4.13	6.56	6.00	0.50	24.19	3.25

Class 400 Forged Flanges Dimension

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B3	H	L	L2	L3c	r	C	D	Thr
½	3.75	0.56	1.38	1.5	4-0.63	2.62	0.88	0.9	0.84	0.88	2.06	0.88	0.12	0.93	0.38	0.62
¾	4.62	0.62	1.69	1.88	4-0.75	3.25	1.09	1.11	1.05	1	2.25	1	0.12	1.14	0.44	0.62
1	4.88	0.69	2	2.12	4-.075	3.5	1.36	1.38	1.32	1.06	2.44	1.06	0.12	1.41	0.5	0.69
1¼	5.25	0.81	2.5	2.5	4-0.75	3.88	1.7	1.72	1.66	1.12	2.62	1.12	0.19	1.75	0.56	0.81
1½	6.12	0.88	2.88	2.75	4-0.88	4.5	1.95	1.97	1.9	1.25	2.75	1.25	0.25	1.99	0.62	0.88
2	6.5	1	3.62	3.31	8-0.75	5	2.44	2.46	2.38	1.44	2.88	1.44	0.31	2.5	0.69	1.12
2½	7.5	1.12	4.12	3.94	8-0.88	5.88	2.94	2.97	2.88	1.62	3.12	1.62	0.31	3	0.75	1.25
3	8.25	1.25	5	4.62	8-0.88	6.62	3.57	3.6	3.5	1.81	3.25	1.81	0.38	3.63	0.81	1.38
3½	9	1.38	5.5	5.25	8-1.00	7.25	4.07	4.1	4	1.94	3.38	1.94	0.38	4.13	1.56
4	10	1.38	6.19	5.75	8-1.00	7.88	4.57	4.6	4.5	2	3.5	2	0.44	4.63	1.44
5	11	1.5	7.31	7	8-1.00	9.25	5.66	5.69	5.56	2.12	4	2.12	0.44	5.69	1.69
6	12.5	1.62	8.5	8.12	12-1.00	10.62	6.72	6.75	6.63	2.25	4.06	2.25	0.5	6.75	1.81
8	15	1.88	10.62	10.25	12-1.12	13	8.72	8.75	8.63	2.69	4.62	2.69	0.5	8.75	2
10	17.5	2.12	12.75	12.62	16-1.25	15.25	10.88	10.92	10.75	2.88	4.88	4	0.5	10.88	2.19
12	20.5	2.25	15	14.75	16-1.38	17.75	12.88	12.92	12.75	3.12	5.38	4.25	0.5	12.94	2.38
14	23	2.38	16.25	16.75	20-1.38	20.25	14.14	14.18	14	3.31	5.88	4.62	0.5	14.19	2.5
16	25.5	2.5	18.5	19	20-1.50	22.5	16.16	16.19	16	3.69	6	5	0.5	16.19	2.69
18	28	2.62	21	21	24-1.50	24.75	18.18	18.2	18	3.88	6.5	5.38	0.5	18.19	2.75
20	30.5	2.75	23	23.12	24-1.62	27	20.2	20.25	20	4	6.62	5.75	0.5	20.19	2.88
22	33	2.88	25.25	25.25	24-1.75	29.25	22.22	22.25	22	4.25	6.75	6	0.5	--
24	36	3	27.25	27.62	24-1.88	32	24.25	24.25	24	4.5	6.88	6.25	0.5	24.19	3.25

Class 600 Forged Flanges Dimension

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B3	H	L	L2	L3c	r	C	D	Thr
½	3.75	0.56	1.38	1.5	4-0.63	2.62	0.88	0.9	0.84	0.88	2.06	0.88	0.12	0.93	0.38	0.62
¾	4.62	0.62	1.69	1.88	4-0.75	3.25	1.09	1.11	1.05	1	2.25	1	0.12	1.14	0.44	0.62
1	4.88	0.69	2	2.12	4-0.75	3.5	1.36	1.38	1.32	1.06	2.44	1.06	0.12	1.41	0.5	0.69
1¼	5.25	0.81	2.5	2.5	4-0.75	3.88	1.7	1.72	1.66	1.12	2.62	1.12	0.19	1.75	0.56	0.81
1½	6.12	0.88	2.88	2.75	4-0.88	4.5	1.95	1.97	1.9	1.25	2.75	1.25	0.25	1.99	0.62	0.88
2	6.5	1	3.62	3.31	8-0.75	5	2.44	2.46	2.38	1.44	2.88	1.44	0.31	2.5	0.69	1.12
2½	7.5	1.12	4.12	3.94	8-0.88	5.88	2.94	2.97	2.88	1.62	3.12	1.62	0.31	3	0.75	1.25
3	8.25	1.25	5	4.62	8-0.88	6.62	3.57	3.6	3.5	1.81	3.25	1.81	0.38	3.63	0.81	1.38
3½	9	1.38	5.5	5.25	8-1.00	7.25	4.07	4.1	4	1.94	3.38	1.94	0.38	4.13	1.56
4	10.75	1.5	6.19	6	8-1.00	8.5	4.57	4.6	4.5	2.12	4	2.12	0.44	4.63	1.62
5	13	1.75	7.31	7.44	8-1.12	10.5	5.66	5.69	5.56	2.38	4.5	2.38	0.44	5.69	1.88
6	14	1.88	8.5	8.75	12-1.12	11.5	6.72	6.75	6.63	2.62	4.62	2.62	0.5	6.75	2
8	16.5	2.19	10.62	10.75	12-1.25	13.75	8.72	8.75	8.63	3	5.25	3	0.5	8.75	2.25
10	20	2.5	12.75	13.5	16-1.38	17	10.88	10.92	10.75	3.38	6	4.38	0.5	10.88	2.56
12	22	2.62	15	15.75	20-1.38	19.25	12.88	12.92	12.75	3.62	6.12	4.62	0.5	12.94	2.75
14	23.75	2.75	16.25	17	20-1.50	20.75	14.14	14.18	14	3.69	6.5	5	0.5	14.19	2.88
16	27	3	18.5	19.5	20-1.63	23.75	16.16	16.19	16	4.19	7	5.5	0.5	16.19	3.06
18	29.25	3.25	21	21.5	20-1.75	25.75	18.18	18.2	18	4.62	7.25	6	0.5	18.19	3.12
20	32	3.5	23	24	24-1.75	28.5	20.2	20.25	20	5	7.5	6.5	0.5	20.19	3.25
22	34.25	3.75	25.25	26.25	24-1.75	30.63	22.22	22.25	22	5.25	7.75	6.88	0.5	--
24	37	4	27.25	28.25	24-2.00	33	24.25	24.25	24	5.5	8	7.25	0.5	24.19	3.62

Class 900 Forged Flanges Dimension

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B3	H	L	L2	L3c	r	C	Thr
Sizes 1/2" through 2 1/2" are identical to class 1500.
3	9.5	1.5	5	5	8-1.00	7.5	3.57	3.6	3.5	2.12	4	2.12	0.38	3.63	1.62
4	11.5	1.75	6.19	6.25	8-1.25	9.25	4.57	4.6	4.5	2.75	4.5	2.75	0.44	4.63	1.88
5	13.75	2	7.31	7.5	8-1.38	11	5.66	5.69	5.56	3.12	5	3.12	0.44	5.69	2.12
6	15	2.19	8.5	9.25	12-1.25	12.5	6.72	6.75	6.63	3.38	5.5	3.38	0.5	6.75	2.25
8	18.5	2.5	10.63	11.75	12-1.50	15.5	8.72	8.75	8.63	4	6.38	4.5	0.5	8.75	2.5
10	21.5	2.75	12.75	14.5	16-1.50	18.5	10.88	10.92	10.75	4.25	7.25	5	0.5	10.88	2.81
12	24	3.12	15	16.5	20-1.50	21	12.88	12.92	12.75	4.63	7.88	5.62	0.5	12.94	3
14	25.25	3.38	16.25	17.75	20-1.63	22	14.14	14.18	14	5.12	8.38	6.12	0.5	14.19	3.25
16	27.75	3.5	18.5	20	20-1.75	24.25	16.16	16.19	16	5.25	8.5	6.5	0.5	16.19	3.38
18	31	4	21	22.25	20-2.00	27	18.18	18.2	18	6	9	7.5	0.5	18.19	3.5
20	33.75	4.25	23	24.5	20-2.13	29.5	20.2	20.25	20	6.25	9.75	8.25	0.5	20.19	3.62
24	41	5.5	27.25	29.5	20-2.63	35.5	24.25	24.25	24	8	11.5	10.5	0.5	24.19	4

Class 1500 Forged Flanges Dimension

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B3	H	L	L2	L3c	r	C	D	Thr
½	4.75	0.88	1.38	1.5	4-0.88	3.25	0.88	0.9	0.84	1.25	2.38	1.25	0.12	0.93	0.38	0.88
¾	5.12	1	1.69	1.75	4-0.88	3.5	1.09	1.11	1.05	1.38	2.75	1.38	0.12	1.14	0.44	1
1	5.88	1.12	2	2.06	4-1.00	4	1.36	1.38	1.32	1.62	2.88	1.62	0.12	1.41	0.5	1.12
1¼	6.25	1.12	2.5	2.5	4-1.00	4.38	1.7	1.72	1.66	1.62	2.88	1.62	0.19	1.75	0.56	1.19
1½	7	1.25	2.88	2.75	4-1.12	4.88	1.95	1.97	1.9	1.75	3.25	1.75	0.25	1.99	0.62	1.25
2	8.5	1.5	3.63	4.12	8-1.00	6.5	2.44	2.46	2.38	2.25	4	2.25	0.31	2.5	0.69	1.5
2½	9.62	1.62	4.13	4.88	8-1.12	7.5	2.94	2.97	2.88	2.5	4.12	2.5	0.31	3	0.75	1.88
3	10.5	1.88	5	5.25	8-1.25	8	3.6	3.5	4.62	2.88	0.38
4	12.25	2.12	6.19	6.38	8-1.38	9.5	4.6	4.5	4.88	3.56	0.44
5	14.75	2.88	7.31	7.75	8-1.63	11.5	5.69	5.56	6.12	4.12	0.44
6	15.5	3.25	8.5	9	12-1.50	12.5	6.75	6.63	6.75	4.69	0.5
8	19	3.62	10.63	11.5	12-1.75	15.5	8.75	8.63	8.38	5.62	0.5
10	23	4.25	12.75	14.5	12-2.00	19	10.92	10.75	10	7	0.5
12	26.5	4.88	15	17.75	16-2.12	22.5	12.92	12.75	11.12	8.62	0.5
14	29.5	5.25	16.25	19.5	16-2.38	25	14.18	14	11.75	9.5	0.5
16	32.5	5.75	18.5	21.75	16-2.63	27.75	16.19	16	12.25	10.25	0.5
18	36	6.38	21	23.5	16-2.88	30.5	18.2	18	12.88	10.88	0.5
20	38.75	7	23	25.25	16-3.12	32.75	20.25	20	14	11.5	0.5
24	46	8	27.25	30	16-3.63	39	24.25	24	16	13	0.5

Class 2500 Forged Flanges Dimension

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B3	H	L	L2	L3	r	C	Thr
½	5.25	1.19	1.38	1.69	4-0.88	3.5	0.9	0.84	1.56	2.88	1.56	0.12	0.93	1.12
¾	5.5	1.25	1.69	2	4-0.88	3.75	1.11	1.05	1.69	3.12	1.69	0.12	1.14	1.25
1	6.25	1.38	2	2.25	4-1.00	4.25	1.38	1.32	1.88	3.5	1.88	0.12	1.41	1.38
1¼	7.25	1.5	2.5	2.88	4-1.12	5.13	1.72	1.66	2.06	3.75	2.06	0.19	1.75	1.5
1½	8	1.75	2.88	3.12	4-1.25	5.75	1.97	1.9	2.38	4.38	2.38	0.25	1.99	1.75
2	9.25	2	3.63	3.75	8-1.12	6.75	2.46	2.38	2.75	5	2.75	0.31	2.5	2
2½	10.5	2.25	4.13	4.5	8-1.25	7.75	2.97	2.88	3.12	5.62	3.12	0.31	3	2.25
3	12	2.62	5	5.25	8-1.38	9	3.6	3.5	6.62	3.62	0.38
4	14	3	6.19	6.5	8-1.63	10.75	4.6	4.5	7.5	4.25	0.44
5	16.5	3.62	7.31	8	8-1.88	12.75	5.69	5.56	9	5.12	0.44
6	19	4.25	8.5	9.25	8-2.12	14.5	6.75	6.63	10.75	6	0.5
8	21.75	5	10.63	12	12-2.12	17.25	8.75	8.63	12.5	7	0.5
10	26.5	6.5	12.75	14.75	12-2.63	21.25	10.92	10.75	16.5	9	0.5
12	30	7.25	15	17.38	12-2.88	24.38	12.92	12.75	18.25	10	0.5

Forged Flange Pressure Ratings

Flanges pressure rating in psig for Forged Flange ASME
Temperature (F°)	150#	300#	400#	600#	900#	1500#	2500#
-20 to 100	285	740	985	1480	2220	3705	6170
200	260	680	905	1360	2035	3395	5655
300	230	655	870	1310	1965	3270	5450
400	200	635	845	1265	1900	3170	5280
500	170	605	805	1205	1810	3015	5025
600	140	570	755	1135	1705	2840	4730
650	125	550	730	1100	1650	2745	4575
700	110	530	710	1060	1590	2655	4425
750	95	505	675	1015	1520	2535	4230
800	80	410	550	825	1235	2055	3430
850	65	320	425	640	955	1595	2655
900	50	230	305	460	690	1150	1915
950	35	135	185	275	410	685	1145
1000	20	85	115	170	255	430	715