ASME B16.5 Flange

PDO Approved ASME B16.5 Pipe Flanges Manufacturer In India And ASA B16.5 Flange Design Specifications.

Buttweld Fittings

ASME B16.5 Pipe Flange

ANSI b16 5 Standard Flange

What Does ASME B16 5 Mean?

ASME B16.5 are components that are used to fit together two pipes or a pipe with other components in a system. They could either be connected by bolt and nut or by welding together. ANSI B16.5 Flanges belong to the standard B16.5. industrial flange have a category that can hold the classes 150 through 2500 and their diameter ranges from ¼ inches to 24 inches. ASA B16.5 Class 600 Flanges belong in the same category but with a higher maximum pressure capacity. industrial pipe flange is a specification of forged flanges. ASME B16.5 pipe flange are preferred by our customers for their durability, corrosion resistance and excellent performance. Their applications and use cases vary. Class 600 Flanges have higher maximum pressure so that they can be applied in heavy duty systems.

Flange Manufacturer In India

ASME B16 5 Flange Dimensions Class 150

Flanges Used In Oil And Gas Industry

What Is ANSI Class 150 Flange?

ANSI B16.5 Class 150 Flange is a pressure class that can handle a maximum pressure of 285psi. Flange sizes from 26 inches and above are governed by ASME B16.5 standards. Class 150 Flanges are mutually the same except is heavier and costly with less bolt holes. 150 LB Flanges are commonly used in applications where the piping system is less than 14 inches in diameter.

Check ANSI B16.5 Class 150/ 300/ 400/ 600/ 900/ 1500/ 2500 Forged Flanges Dimensions In MM.

As the leading ANSI B16.5 Flanges manufacturer in India, we also supply ASME B16.5 Flange which has high corrosion resistance against most oxidizing and reducing media. flange material are used in steel pipe lines where strength is the primary concern. DIN86029 PN10 Flanges can withstand pressure levels up to 10 bars. It is a rating system with Pression Number (PN) which indicates in bars how much pressure the flange can withstand. We also supply Non Standard Flanges and flanges used in oil and gas industry and many other varieties of stainless steel flanges.

ASME B16.5 Material Specification

Material Specification Of:	ASME B16.5 Flange
ASME B16.5 Standard Cover :	pressure ratings & temperature ratings, materials, marking, dimensions, weight, tolerances, testing
Contact Faces For ANSI B16.5	RTJ (Ring Type Joint), FF (Flat Face), RF (Raised Face), T/G (Tongue And Groove ), M/F (Male And Female)
Size Chart	Normal Pipe Size 1/2 to NPS 24"
Materials	Stainless Steel (Grade 304/L, 316/L), Carbon Steel (ASTM A105 And ASTM A350), Alloy Steel (ASTM A182), Mild Steel, Duplex Steel, Pressure Vessel Steel, Titanium, Super Duplex Steel, Nickel Alloy, Monel, Inconel, Hastelloy, Copper Nickel, Cast Iron, Wrought Iron.
Thickness Of ASME B16.5	Normal Pipe Size ≤ 18
Bore Diameter Of ANSI B16.5	Normal Pipe ≤ 10
Flanges Standards	EN 1092-1, JIS, ASME B16.5, ASME B16.47 type A, UNI, DIN
ASME B16.5 Pressure Rating	Class 150 To Class 2500
High Temperature Of ASME B16.5	Above 200°C (400°F) For Class 150 Or Above 400°C (750°F)
Low Temperature Of ANSI B16.5	Above -29 Degree C (−20°F)
Common Types Of ASME B16.5	Slip On (SORF), Weld Neck (WNRF), Blind (BLRF), Lap Joint (Loose), Threaded (NPT), Socket-Weld (SWRF)
ASME B16.5 Marking Standard	Name of Manufacturer Schedule Type of Flange Facing Nominal Pipe Size Pressure Class ASME B16 Designation
ASME B16.5 Bolt Type	high strength bolts medium strength bolts low strength bolts
European Standard Flanges	JIS B2220 Flanges (5k to 30k) and KS1503 flanges
Russian-Standard Flanges	GOST 12820 / 12821-80, DIN, UNI, EN 1092-1
South African Standard Flanges	SANSflanges And SABS flanges
Surface Finish Of ASME B16.5	smooth, concentric serrated, stock
ANSI B16.5 Flanges Gaskets Types	Full Face Gasket Flat Ring Gasket Metallic Ring Gakset
Advantages Of Pipe Flange	Used to Connect Pipe System Easy Repair Pipe System Assembled Without Welding

Standard Pipe Flange Dimensions In Mm

ANSI B16.5 Class 150 Flange Dimensions

(NPS) Nominal Pipe Size	(OD)	Minimum Thickness (T)	RF Diameter (R)	Number of Bolt Holes	Holes Diameter	Circle Of Bolt (BC)	So Bore Inside Daimeter (SB)	Diameter Hub Base (HB)	Diameter Hub Top (HT)	SO LTH (SL)	WN LTH (WL)	* WN Bore Inside Daimeter (WB)
¹⁄₂	4.75	0.88	1.38	4	0.88	3.25	0.88	1.50	0.84	1.25	2.38	*
³⁄₄	5.12	1.00	1.69	4	0.88	3.50	1.09	1.75	1.05	1.38	2.75	*
1	5.88	1.12	2.00	4	1.00	4.00	1.36	2.06	1.32	1.62	2.88	*
1¹⁄₄	6.25	1.12	2.50	4	1.00	4.38	1.70	2.50	1.66	1.62	2.88	*
1¹⁄₂	7.00	1.25	2.88	4	1.12	4.88	1.95	2.75	1.90	1.75	3.25	*
2	8.50	1.50	3.63	8	1.00	6.50	2.44	4.12	2.38	2.25	4.00	*
2¹⁄₂	9.62	1.62	4.13	8	1.12	7.50	2.94	4.88	2.88	2.50	4.12	*
3	10.50	1.88	5.00	8	1.25	8.00	–	5.25	3.50	–	4.62	*
4	12.25	2.12	6.19	8	1.38	9.50	–	6.38	4.50	–	4.88	*
5	14.75	2.88	7.31	8	1.63	11.50	–	7.75	5.56	–	6.12	*
6	15.50	3.25	8.50	12	1.50	12.50	–	9.00	6.63	–	6.75	*
8	19.00	3.62	10.63	12	1.75	15.50	–	11.50	8.63	–	8.38	*
10	23.00	4.25	12.75	12	2.00	19.00	–	14.50	10.75	–	10.00	*
12	26.50	4.88	15.00	16	2.12	22.50	–	17.75	12.75	–	11.12	*
14	29.50	5.25	16.25	16	2.38	25.00	–	19.50	14.00	–	11.75	*
16	32.50	5.75	18.50	16	2.63	27.75	–	21.75	16.00	–	12.25	*
18	36.00	6.38	21.00	16	2.88	30.50	–	23.50	18.00	–	12.88	*
20	38.75	7.00	23.00	16	3.12	32.75	–	25.25	20.00	–	14.00	*
24	46.00	8.00	27.25	16	3.63	39.00	–	30.00	24.00	–	16.00	*

Class 300 Flange Dimensions

(NPS) Nominal Pipe Size	(OD)	Minimum Thickness (T)	RF Diameter (R)	Number of Bolt Holes	Holes Diameter	Circle Of Bolt (BC)	So Bore Inside Daimeter (SB)	Diameter Hub Base (HB)	Diameter Hub Top (HT)	SO LTH (SL)	WN LTH (WL)	* WN Bore Inside Daimeter (WB)
¹⁄₂	4.75	0.88	1.38	4	0.88	3.25	0.88	1.50	0.84	1.25	2.38	*
³⁄₄	5.12	1.00	1.69	4	0.88	3.50	1.09	1.75	1.05	1.38	2.75	*
1	5.88	1.12	2.00	4	1.00	4.00	1.36	2.06	1.32	1.62	2.88	*
1¹⁄₄	6.25	1.12	2.50	4	1.00	4.38	1.70	2.50	1.66	1.62	2.88	*
1¹⁄₂	7.00	1.25	2.88	4	1.12	4.88	1.95	2.75	1.90	1.75	3.25	*
2	8.50	1.50	3.63	8	1.00	6.50	2.44	4.12	2.38	2.25	4.00	*
2¹⁄₂	9.62	1.62	4.13	8	1.12	7.50	2.94	4.88	2.88	2.50	4.12	*
3	10.50	1.88	5.00	8	1.25	8.00	–	5.25	3.50	–	4.62	*
4	12.25	2.12	6.19	8	1.38	9.50	–	6.38	4.50	–	4.88	*
5	14.75	2.88	7.31	8	1.63	11.50	–	7.75	5.56	–	6.12	*
6	15.50	3.25	8.50	12	1.50	12.50	–	9.00	6.63	–	6.75	*
8	19.00	3.62	10.63	12	1.75	15.50	–	11.50	8.63	–	8.38	*
10	23.00	4.25	12.75	12	2.00	19.00	–	14.50	10.75	–	10.00	*
12	26.50	4.88	15.00	16	2.12	22.50	–	17.75	12.75	–	11.12	*
14	29.50	5.25	16.25	16	2.38	25.00	–	19.50	14.00	–	11.75	*
16	32.50	5.75	18.50	16	2.63	27.75	–	21.75	16.00	–	12.25	*
18	36.00	6.38	21.00	16	2.88	30.50	–	23.50	18.00	–	12.88	*
20	38.75	7.00	23.00	16	3.12	32.75	–	25.25	20.00	–	14.00	*
24	46.00	8.00	27.25	16	3.63	39.00	–	30.00	24.00	–	16.00	*

ANSI B16.5 Class 400 Flange Dimensions

(NPS) Nominal Pipe Size	(OD)	Minimum Thickness (T)	RF Diameter (R)	Number of Bolt Holes	Holes Diameter	Circle Of Bolt (BC)	SO Bore Inside Daimeter (SB)	Diameter Hub Base (HB)	Diameter Hub Top (HT)	SO LTH (SL)	WN LTH (WL)	* WN Bore Inside Daimeter (WB)
¹⁄₂	3.75	0.56	1.38	4	0.63	2.62	0.88	1.5	0.84	0.88	2.06	*
³⁄₄	4.62	0.62	1.69	4	0.75	3.25	1.09	1.88	1.05	1.00	2.25	*
1	4.88	0.69	2.00	4	0.75	3.50	1.36	2.12	1.32	1.06	2.44	*
1¹⁄₄	5.25	0.81	2.50	4	0.75	3.88	1.70	2.50	1.66	1.12	2.62	*
1¹⁄₂	6.12	0.88	2.88	4	0.88	4.50	1.95	2.75	1.90	1.25	2.75	*
2	6.50	1.00	3.62	8	0.75	5.00	2.44	3.31	2.38	1.44	2.88	*
2¹⁄₂	7.50	1.12	4.12	8	0.88	5.88	2.94	3.94	2.88	1.62	3.12	*
3	8.25	1.25	5.00	8	0.88	6.62	3.57	4.62	3.50	1.81	3.25	*
3¹⁄₂	9.00	1.38	5.50	8	1.00	7.25	4.07	5.25	4.00	1.94	3.38	*
4	10.00	1.38	6.19	8	1.00	7.88	4.57	5.75	4.50	2.00	3.50	*
5	11.00	1.50	7.31	8	1.00	9.25	5.66	7.00	5.56	2.12	4.00	*
6	12.50	1.62	8.50	12	1.00	10.62	6.72	8.12	6.63	2.25	4.06	*
8	15.00	1.88	10.62	12	1.12	13.00	8.72	10.25	8.63	2.69	4.62	*
10	17.50	2.12	12.75	16	1.25	15.25	10.88	12.62	10.75	2.88	4.88	*
12	20.50	2.25	15.00	16	1.38	17.75	12.88	14.75	12.75	3.12	5.38	*
14	23.00	2.38	16.25	20	1.38	20.25	14.14	16.75	14.00	3.31	5.88	*
16	25.50	2.50	18.50	20	1.50	22.50	16.16	19.00	16.00	3.69	6.00	*
18	28.00	2.62	21.00	24	1.50	24.75	18.18	21.00	18.00	3.88	6.50	*
20	30.50	2.75	23.12	24	1.62	27.00	20.20	23.12	20.00	4.00	6.62	*
22	33.00	2.88	25.25	24	1.75	29.25	22.22	25.25	22.00	4.25	6.75	*
24	36.00	3.00	27.25	24	1.88	32.00	24.25	27.62	24.00	4.50	6.88	*

ANSI 600 Flange Dimensions In MM

(NPS) Nominal Pipe Size	(OD)	Minimum Thickness (T)	RF Diameter (R)	Number of Bolt Holes	Holes Diameter	Circle Of Bolt (BC)	SO Bore Inside Daimeter (SB)	Diameter Hub Base (HB)	Diameter Hub Top (HT)	SO LTH (SL)	WN LTH (WL)	* WN Bore Inside Daimeter (WB)
¹⁄₂	3.75	0.56	1.38	4	0.63	2.62	0.88	1.50	0.84	0.88	2.06	*
³⁄₄	4.62	0.62	1.69	4	0.75	3.25	1.09	1.88	1.05	1.00	2.25	*
1	4.88	0.69	2.00	4	0.75	3.50	1.36	2.12	1.32	1.06	2.44	*
1¹⁄₄	5.25	0.81	2.50	4	0.75	3.88	1.70	2.50	1.66	1.12	2.62	*
1¹⁄₂	6.12	0.88	2.88	4	0.88	4.50	1.95	2.75	1.90	1.25	2.75	*
2	6.50	1.00	3.62	8	0.75	5.00	2.44	3.31	2.38	1.44	2.88	*
2¹⁄₂	7.50	1.12	4.12	8	0.88	5.88	2.94	3.94	2.88	1.62	3.12	*
3	8.25	1.25	5.00	8	0.88	6.62	3.57	4.62	3.50	1.81	3.25	*
3¹⁄₂	9.00	1.38	5.50	8	1.00	7.25	4.07	5.25	4.00	1.94	3.38	*
4	10.75	1.50	6.19	8	1.00	8.50	4.57	6.00	4.50	2.12	4.00	*
5	13.00	1.75	7.31	8	1.12	10.50	5.66	7.44	5.56	2.38	4.50	*
6	14.00	1.88	8.50	12	1.12	11.50	6.72	8.75	6.63	2.62	4.62	*
8	16.50	2.19	10.62	12	1.25	13.75	8.72	10.75	8.63	3.00	5.25	*
10	20.00	2.50	12.75	16	1.38	17.00	10.88	13.50	10.75	3.38	6.00	*
12	22.00	2.62	15.00	20	1.38	19.25	12.88	15.75	12.75	3.62	6.12	*
14	23.75	2.75	16.25	20	1.50	20.75	14.14	17.00	14.00	3.69	6.50	*
16	27.00	3.00	18.50	20	1.63	23.75	16.16	19.50	16.00	4.19	7.00	*
18	29.25	3.25	21.00	20	1.75	25.75	18.18	21.50	18.00	4.62	7.25	*
20	32.00	3.50	23.00	24	1.75	28.50	20.20	24.00	20.00	5.00	7.50	*
22	34.25	3.75	25.25	24	1.88	30.63	22.22	26.25	22.00	5.25	7.75	*
24	37.00	4.00	27.25	24	2.00	33.00	24.25	28.25	24.00	5.50	8.00	*

ANSI B16.5 Class 900 Flange Dimensions

(NPS) Nominal Pipe Size	(OD)	Minimum Thickness (T)	RF Diameter (R)	Number of Bolt Holes	Holes Diameter	Circle Of Bolt (BC)	SO Bore ID (SB)	* WN Bore ID (WB)	Diameter Hub Base (HB)	Diameter Hub Top (HT)	SO LTH (SL)	WN LTH (WL)
3	9.50	1.50	5.00	8	1.00	7.50	3.57	*	5.00	3.50	2.12	4.00
4	11.50	1.75	6.19	8	1.25	9.25	4.57	*	6.25	4.50	2.75	4.50
5	13.75	2.00	7.31	8	1.38	11.00	5.66	*	7.50	5.56	3.12	5.00
6	15.00	2.19	8.50	12	1.25	12.50	6.72	*	9.25	6.63	3.38	5.50
8	18.50	2.50	10.63	12	1.50	15.50	8.72	*	11.75	8.63	4.00	6.38
10	21.50	2.75	12.75	16	1.50	18.50	10.88	*	14.50	10.75	4.25	7.25
12	24.00	3.12	15.00	20	1.50	21.00	12.88	*	16.50	12.75	4.63	7.88
14	25.25	3.38	16.25	20	1.63	22.00	14.14	*	17.75	14.00	5.12	8.38
16	27.75	3.50	18.50	20	1.75	24.25	16.16	*	20.00	16.00	5.25	8.50
18	31.00	4.00	21.00	20	2.00	27.00	18.18	*	22.25	18.00	6.00	9.00
20	33.75	4.25	23.00	20	2.13	29.50	20.20	*	24.50	20.00	6.25	9.75
24	41.00	5.50	27.25	20	2.63	35.50	24.25	*	29.50	24.00	8.00	11.50

ASME B16.5 Class 1500 Flange Dimensions

(NPS) Nominal Pipe Size	(OD)	Minimum Thickness (T)	RF Diameter (R)	Number of Bolt Holes	Holes Diameter	Circle Of Bolt (BC)	So Bore Inside Daimeter (SB)	Diameter Hub Base (HB)	Diameter Hub Top (HT)	SO LTH (SL)	WN LTH (WL)	* WN Bore Inside Daimeter (WB)
¹⁄₂	4.75	0.88	1.38	4	0.88	3.25	0.88	1.50	0.84	1.25	2.38	*
³⁄₄	5.12	1.00	1.69	4	0.88	3.50	1.09	1.75	1.05	1.38	2.75	*
1	5.88	1.12	2.00	4	1.00	4.00	1.36	2.06	1.32	1.62	2.88	*
1¹⁄₄	6.25	1.12	2.50	4	1.00	4.38	1.70	2.50	1.66	1.62	2.88	*
1¹⁄₂	7.00	1.25	2.88	4	1.12	4.88	1.95	2.75	1.90	1.75	3.25	*
2	8.50	1.50	3.63	8	1.00	6.50	2.44	4.12	2.38	2.25	4.00	*
2¹⁄₂	9.62	1.62	4.13	8	1.12	7.50	2.94	4.88	2.88	2.50	4.12	*
3	10.50	1.88	5.00	8	1.25	8.00	–	5.25	3.50	–	4.62	*
4	12.25	2.12	6.19	8	1.38	9.50	–	6.38	4.50	–	4.88	*
5	14.75	2.88	7.31	8	1.63	11.50	–	7.75	5.56	–	6.12	*
6	15.50	3.25	8.50	12	1.50	12.50	–	9.00	6.63	–	6.75	*
8	19.00	3.62	10.63	12	1.75	15.50	–	11.50	8.63	–	8.38	*
10	23.00	4.25	12.75	12	2.00	19.00	–	14.50	10.75	–	10.00	*
12	26.50	4.88	15.00	16	2.12	22.50	–	17.75	12.75	–	11.12	*
14	29.50	5.25	16.25	16	2.38	25.00	–	19.50	14.00	–	11.75	*
16	32.50	5.75	18.50	16	2.63	27.75	–	21.75	16.00	–	12.25	*
18	36.00	6.38	21.00	16	2.88	30.50	–	23.50	18.00	–	12.88	*
20	38.75	7.00	23.00	16	3.12	32.75	–	25.25	20.00	–	14.00	*
24	46.00	8.00	27.25	16	3.63	39.00	–	30.00	24.00	–	16.00	*

ASME B16.5 Class 2500 Flange Dimensions

(NPS) Nominal Pipe Size	(OD)	Minimum Thickness (T)	RF Diameter (R)	Number of Bolt Holes	Holes Diameter	Circle Of Bolt (BC)	Diameter Hub Base (HB)	Diameter Hub Top (HT)	SO LTH (SL)	WN LTH (WL)	* WN Bore ID (WB)
¹⁄₂	5.25	1.19	1.38	4	0.88	3.50	1.69	0.84	1.56	2.88	*
³⁄₄	5.50	1.25	1.69	4	0.88	3.75	2.00	1.05	1.69	3.12	*
1	6.25	1.38	2.00	4	1.00	4.25	2.25	1.32	1.88	3.50	*
1¹⁄₄	7.25	1.50	2.50	4	1.12	5.13	2.88	1.66	2.06	3.75	*
1¹⁄₂	8.00	1.75	2.88	4	1.25	5.75	3.12	1.90	2.38	4.38	*
2	9.25	2.00	3.63	8	1.12	6.75	3.75	2.38	2.75	5.00	*
2¹⁄₂	10.50	2.25	4.13	8	1.25	7.75	4.50	2.88	3.12	5.62	*
3	12.00	2.62	5.00	8	1.38	9.00	5.25	3.50	–	6.62	*
4	14.00	3.00	6.19	8	1.63	10.75	6.50	4.50	–	7.50	*
5	16.50	3.62	7.31	8	1.88	12.75	8.00	5.56	–	9.00	*
6	19.00	4.25	8.50	8	2.12	14.50	9.25	6.63	–	10.75	*
8	21.75	5.00	10.63	12	2.12	17.25	12.00	8.63	–	12.50	*
10	26.50	6.50	12.75	12	2.63	21.25	14.75	10.75	–	16.50	*
12	30.00	7.25	15.00	12	2.88	24.38	17.38	12.75	–	18.25	*

Refer Industrial Pipe Flanges Weight Chart According to ASME B16.5 And 150# Flange Bolt Chart.

Pipe Flange Size Chart

DN In inches	Dimension	ASME B16.5 Dimensional Sizes 1/2 inches to 2 1/2 inches
		125# 150#		300#		400#		600#		900#		1500#		2500#
		inches	millimeter	inches	millimeter	inches	millimeter	inches	millimeter	inches	millimeter	inches	millimeter	inches		millimeter
1/2	A	3 1/2	88.9	3 3/4	95.2	3 3/4	95.2	3 3/4	95.2	4 3/4	121	4 3/4	121	5 1/4	133.4
	b	7/16	11.1	9/16	14.3	9/16	14.3	9/16	14.3	7/8	22.2	7/8	22.2	1 3/16	30.2
	D2	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9
	D1	2 3/8	60.3	2 5/8	66.7	2 5/8	66.7	2 5/8	66.7	3 1/4	82.6	3 1/4	82.6	3 1/2	88.9
	n	4	4	4	4	4	4	4	4	4	4	4	-	4	44
	d	5/8	15.9	5/8	15.9	5/8	15.9	5/8	15.9	7/8	22.2	7/8	22.2	7/8	22.2
3/4	A	3 7/8	98.4	4 5/8	117.5	4 5/8	117.5	4 5/8	117.5	5 1/8	130	5 1/8	130	5 1/2	139.7
	b	1/2	12.7	5/8	15.9	5/8	15.9	5/8	15.9	1	25.4	1	25.4	1 1/4	31.8
	D2	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9
	D1	2 3/4	69.8	3 1/4	82.5	3 1/4	82.5	3 1/4	82.5	3 1/2	88.9	3 1/2	88.9	3 3/4	95.2
	n	4	4	4	4	4	4	4	4	4	4	4	-	4	44
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	7/8	22.2	7/8	22.2	7/8	22.2
1	A	4 1/4	108	4 7/8	123.8	4 7/8	123.8	4 7/8	123.8	5 7/8	149.2	5 7/8	149.2	6 1/4	159
	b	9/16	14.3	11/16	17.5	11/16	17.5	11/16	17.5	1 1/8	28.6	1 1/8	28.6	1 3/8	34.9
	D2	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8
	D1	3 1/8	79.4	3 1/2	88.9	3 1/2	88.9	3 1/2	88.9	4	102	4	102	4 1/4	108
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1	25.4
1 1/4	A	4 5/8	117.5	5 1/4	133.4	5 1/4	133.4	5 1/4	133.4	6 1/4	159	6 1/4	159	7 1/4	184.2
	b	5/8	15.9	3/4	19	13/16	20.6	13/16	20.6	1 1/8	28.6	1 1/8	28.6	1 1/2	38.1
	D2	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5
	D1	3 1/2	88.9	3 7/8	98.4	3 7/8	98.4	3 7/8	98.4	4 3/8	111	4 3/8	111	5 1/8	130
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1 1/8	28.6
1 1/2	A	5	127	6 1/8	155.6	6 1/8	155.6	6 1/8	155.6	7	177.8	7	177.8	8	203
	b	11/16	17.5	13/16	20.6	7/8	22.2	7/8	22.2	1 1/4	31.8	1 1/4	31.8	1 3/4	44.5
	D2	2 7/8	73 98	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73
	D1	3 7/8	4	4 1/2	114	4 1/2	114	4 1/2	114	4 7/8	124	4 7/8	124	5 3/4	146
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	. 15.9	7/8	22.2	7/8	22.2	7/8	22.2	1 1/8	28.6	1 1/8	28.6	1 1/4	31.8
2	A	6	152.4	6 1/2	165.1	6 1/2	165.1	6 1/2	165.1	8 1/2	215.9	8 1/2	215.9	9 1/4	234.9
	b	3/4	19	7/8	22.2	1	25.4	1	25.4	1 1/2	38.1	1 1/2	38.1	2	50.8
	D2	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1
	D1	4 3/4	121	5	127	5	127	5	127	6 1/2	165.1	6 1/2	165.1	6 3/4	171
	n	4	4	8	8	8	8	8	8	8	8	8	8	8	8
	d	3/4	19	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1 1/8	28.6
2 1/2	A	7	177.8	7 1/2	190.5	7 1/2	190.5	7 1/2	190.5	9 5/8	244	9 5/8	244	10 1/2	266.7
	b	7/8	22.2	1	25.4	1 1/8	28.6	1 1/8	28.6	1 5/8	41.3	1 5/8	41.3	2 1/4	57.2
	D2	4 1/8	104.8	4 1/8	104.8	4 1/8	104.8	4 1/8	104.8	4 1/8	105	4 1/8	105	4 1/8	105
	D1	5 1/2	139.7	5 7/8	149.2	5 7/8	149.2	5 7/8	149.2	7 1/2	190.5	7 1/2	190.5	7 3/4	197
	n	4	4	8	8	8	8	8	8	8	8	8	8	8	8
	d	3/4	19	7/8	22.2	7/8	22.2	7/8	22.2	1 1/8	28.6	1 1/8	28.6	1 1/4	31.8

View ASME B16.5 Flange Pressure Rating And Grooved Flange Thickness Calculation For Pressure Vessel.

DN In inches	Dimension	ASME B16.5 Dimensional Sizes 1/2 inches to 2 1/2 inches
		125# 150#		300#		400#		600#		900#		1500#		2500#
		inches	millimeter	inches	millimeter	inches	millimeter	inches	millimeter	inches	millimeter	inches	millimeter	inches		millimeter
1/2	A	3 1/2	88.9	3 3/4	95.2	3 3/4	95.2	3 3/4	95.2	4 3/4	121	4 3/4	121	5 1/4	133.4
	b	7/16	11.1	9/16	14.3	9/16	14.3	9/16	14.3	7/8	22.2	7/8	22.2	1 3/16	30.2
	D2	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9
	D1	2 3/8	60.3	2 5/8	66.7	2 5/8	66.7	2 5/8	66.7	3 1/4	82.6	3 1/4	82.6	3 1/2	88.9
	n	4	4	4	4	4	4	4	4	4	4	4	-	4	44
	d	5/8	15.9	5/8	15.9	5/8	15.9	5/8	15.9	7/8	22.2	7/8	22.2	7/8	22.2
3/4	A	3 7/8	98.4	4 5/8	117.5	4 5/8	117.5	4 5/8	117.5	5 1/8	130	5 1/8	130	5 1/2	139.7
	b	1/2	12.7	5/8	15.9	5/8	15.9	5/8	15.9	1	25.4	1	25.4	1 1/4	31.8
	D2	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9
	D1	2 3/4	69.8	3 1/4	82.5	3 1/4	82.5	3 1/4	82.5	3 1/2	88.9	3 1/2	88.9	3 3/4	95.2
	n	4	4	4	4	4	4	4	4	4	4	4	-	4	44
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	7/8	22.2	7/8	22.2	7/8	22.2
1	A	4 1/4	108	4 7/8	123.8	4 7/8	123.8	4 7/8	123.8	5 7/8	149.2	5 7/8	149.2	6 1/4	159
	b	9/16	14.3	11/16	17.5	11/16	17.5	11/16	17.5	1 1/8	28.6	1 1/8	28.6	1 3/8	34.9
	D2	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8
	D1	3 1/8	79.4	3 1/2	88.9	3 1/2	88.9	3 1/2	88.9	4	102	4	102	4 1/4	108
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1	25.4
1 1/4	A	4 5/8	117.5	5 1/4	133.4	5 1/4	133.4	5 1/4	133.4	6 1/4	159	6 1/4	159	7 1/4	184.2
	b	5/8	15.9	3/4	19	13/16	20.6	13/16	20.6	1 1/8	28.6	1 1/8	28.6	1 1/2	38.1
	D2	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5
	D1	3 1/2	88.9	3 7/8	98.4	3 7/8	98.4	3 7/8	98.4	4 3/8	111	4 3/8	111	5 1/8	130
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1 1/8	28.6
1 1/2	A	5	127	6 1/8	155.6	6 1/8	155.6	6 1/8	155.6	7	177.8	7	177.8	8	203
	b	11/16	17.5	13/16	20.6	7/8	22.2	7/8	22.2	1 1/4	31.8	1 1/4	31.8	1 3/4	44.5
	D2	2 7/8	73 98	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73
	D1	3 7/8	4	4 1/2	114	4 1/2	114	4 1/2	114	4 7/8	124	4 7/8	124	5 3/4	146
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	. 15.9	7/8	22.2	7/8	22.2	7/8	22.2	1 1/8	28.6	1 1/8	28.6	1 1/4	31.8
2	A	6	152.4	6 1/2	165.1	6 1/2	165.1	6 1/2	165.1	8 1/2	215.9	8 1/2	215.9	9 1/4	234.9
	b	3/4	19	7/8	22.2	1	25.4	1	25.4	1 1/2	38.1	1 1/2	38.1	2	50.8
	D2	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1
	D1	4 3/4	121	5	127	5	127	5	127	6 1/2	165.1	6 1/2	165.1	6 3/4	171
	n	4	4	8	8	8	8	8	8	8	8	8	8	8	8
	d	3/4	19	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1 1/8	28.6
2 1/2	A	7	177.8	7 1/2	190.5	7 1/2	190.5	7 1/2	190.5	9 5/8	244	9 5/8	244	10 1/2	266.7
	b	7/8	22.2	1	25.4	1 1/8	28.6	1 1/8	28.6	1 5/8	41.3	1 5/8	41.3	2 1/4	57.2
	D2	4 1/8	104.8	4 1/8	104.8	4 1/8	104.8	4 1/8	104.8	4 1/8	105	4 1/8	105	4 1/8	105
	D1	5 1/2	139.7	5 7/8	149.2	5 7/8	149.2	5 7/8	149.2	7 1/2	190.5	7 1/2	190.5	7 3/4	197
	n	4	4	8	8	8	8	8	8	8	8	8	8	8	8
	d	3/4	19	7/8	22.2	7/8	22.2	7/8	22.2	1 1/8	28.6	1 1/8	28.6	1 1/4	31.8

ASME B16.5 Pressure Temperature Ratings

ASME B16.5 Pressure Pressure
Temperature (°C)	Class
Temperature (°C)	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

ASTM Material Grades As Per ANSI B16.5

Material	Pipes	Fittings	Flanges	Valves	Bolt & Nut
Carbon Steel	A106 gr A	A234 gr WPA	A105	A216 gr WCB	A193 Grades B7 A194 Grades 2H
	A106 Grades B	A234 gr WPB	A105	A216 Grades WCB
	A106 gr C	A234 Grades WPC	A105	A216 Grades WCB

Carbon Steel Alloy High-Temp	A335 gr P1	A234 gr WP1	A182 gr F1	A217 gr WC1	A193 Grades B7 A194 Grades 2H
	A335 gr P11	A234 Grades WP11	A182 gr F11	A217 Grades WC6
	A335 Grades P12	A234 gr WP12	A182 Grades F12	A217 gr WC6
	A335 gr P22	A234 Grades WP22	A182 Grades F22	A217 gr WC9
	A335 gr P5	A234 Grades WP5	A182 Grades F5	A217 gr C5
	A335 gr P9	A234 Grades WP9	A182 gr F9	A217 Grades C12

Carbon Steel Alloy Low-Temp	A333 gr 6	A420 gr WPL6	A350 gr LF2	A352 Grades LCB	A320 gr L7 A194 Grades 7
Carbon Steel Alloy Low-Temp	A333 gr 3	A420 Grade WPL3	A350 Grade LF3	A352 gr LC3	A320 gr L7 A194 Grades 7

Austenitic Stainless Steel	A312 gr TP304	A403 Grade WP304	A182 gr F304	A182 Grade F304	A193 Grade B8 A194 Grade 8
	A312 Grade TP316	A403 Grade WP316	A182 Grade F316	A182 Gr F316
	A312 Gr TP321	A403 Gr WP321	A182 Gr F321	A182 Gr F321
	A312 Gr TP347	A403 Gr WP347	A182 Gr F347	A182 Gr F347

ASME B16.5 Flange Weight Chart

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

Calculation Flange Hole Marking Formula

Industrial Flange Chemical Composition

C	Mn	P	S	Si	Cu	Ni	Cr	Mo	V
0.35	0.60-1.05	0.035	0.04	0.10-0.35	0.4	0.4	0.3	0.12	0.08
maxi.	–	maxi.	maxi.	–	maximum (1)	maximum (1)	maximum (1-2)	maximum (1-2)	maximum

ASME Flange Bolt Length Chart

ANSI Flange Bore Diameter

Lap Joint and SORF Flange Bores

Size	Tolerance
Normal Pipe Size ≤ 10	+1.0, -0.0 millimeter (+0.03,-0.0 in.)
Normal Pipe Size ≥ 12	+1.5, -0.0 millimeter (+0.06,-0.0 in.)

Counter Bores, NPT Flanges

Normal Pipe Size	Tolerance
Normal Pipe Size (NPS) ≤ 10	+1.0, -0.0 millimeter (+0.03,-0.0 inches)
Normal Pipe Size (NPS) ≥ 12	+1.5, -0.0 millimeter (+0.06,-0.0 inches)

Counter Bores, Welding Flanges

Size	Tolerance
1/2 ≤ Normal Pipe Size (NPS) ≤ 3	±0.25 millimeter (±0.010 inches)

Check NPT Flange Size Chart And Tolerance Chart Of PN16 Flanges, Gasket Flange Supplier In Mumbai, India.

ASME B16.5 Tolerances

ASME B16.5	Tolerance
A	Outside Diameter (O.D.)	When Outside Diameter (O.D.) is 24" or less: ±1/16" (1.6 mm) When Outside Diameter (O.D.) is over 24": ±1/8" (3.2 mm)
D	Inside Diameter	10" and smaller: ±1/32" (0.8 millimeter) 12" thru 18": +1/8" (3.2 millimeter) 20" and larger: -1/16" (1.6 millimeter)
B	Diameter of contact face	1/16" raised face: ±1/32" (0.8 millimeter) 1/4" Raised Face (RF), Tongue & Groove (T/G), (male & female), (m/f): ±1/64" (0.4 mm)
J	Diameter of hub at base	When hub base is 24" or smaller: ±1/16" (1.6 millimeter) When hub base is over 24": ±1/8" (3.2 millimeter)
H	Diameter of hub at point of welding	5" and smaller: +3/32" (2.4 millimeter), -1/32" (0.8 millimeter) 6" and larger: +5/32" (4.0 millimeter), -1/32 (0.8 millimeter)
P	Drilling	Bolt circle: ±1/16" (1.6 millimeter) Bolt hole spacing: ±1/32" (0.8 millimeter)
	Eccentricity of bolt circle with respect to facing	2 1/2" and smaller ±1/32" (0.8 millimeter) max. 3" and larger ±1/16" (1.6 millimeter) max.
C	Thickness	18" and smaller: ±1/8" (3.2 millimeter), -0" 20" and larger: ±3/16" (4.8 millimeter), -0"
K	Length of hub	10" and smaller: ±1/16" (1.6 millimeter) 12" and larger: ±1/8" (3.2 millimeter)

Type Of ANSI B16.5 According To ASME-ANSI-DIN-2627-EN-1092

Types	EN standard	DIN standard	Pressure	Gr.
Weld-on Collars	EN1092-1/32	DIN 2641 \| 2642 \| 2655 \| 2656	PN6, Pn10, 16, 25, 40, 63, 100, 160, 250, 320, Pn400	S235JR, P250GH / C 22.8, P245GH, P265GH, P280GH, P355NH, 16Mo3, 13CrMo4-5, P355QH1 / W/TStE 355, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)
Flat (FF) Flange	EN1092-1/01	DIN 2573 \| 2576	PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400	S235JR, P250GH / C 22.8, P245GH, P265GH, P280GH, P355NH, 16Mo3, 13CrMo4-5, P355QH1 / W/TStE 355, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)
Weld Neck (WN) Flange	EN1092-1/11	DIN 2627-2638	PN6, 10, 16, 25, 40, 63, 100, 160, 250, 320, 400	S235JR, P250GH / C 22.8, P245GH, 13CrMo4-5, P355QH1 / W/TStE 355, P265GH, P280GH, P355NH, 16Mo3, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)
Weld Neck Collars	EN1092-1/34	DIN 2673 – 2676	PN6, PN10, PN16, PN25, PN40, 63, PN100, PN160, PN250, 320, PN400	S235JR, P250GH / C 22.8, P245GH, P265GH, P280GH, P355NH, 16Mo3, 13CrMo4-5, P355QH1 / W/TStE 355, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)
Loose (Lap Joint) Flange	EN1092-1/04	DIN 2673 – 2676	PN6, PN10, 16, 25, 40, 63, 100, 160, 250, 320, 400	S235JR, P250GH / C 22.8, P245GH, 13CrMo4-5, P355QH1 / W/TStE 355, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, P265GH, P280GH, P355NH, 16Mo3, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)
Blind (BLRF) Flange	EN1092-1/05	DIN 2527	PN6, 10, 16, 25, 40, 63, 100, 160, 250, 320, 400	S235JR, P250GH / C 22.8, P245GH, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, P265GH, P280GH, P355NH, 16Mo3, 13CrMo4-5, P355QH1 / W/TStE 355, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)
Lap Joint (Loose) Flange	EN1092-1/02	DIN 2641 \| 2642 \| 2655 \| 2656	Pn6, 10, Pn16, 25, 40, 63, 100, 160, 250, 320, 400	S235JR, P250GH / C 22.8, P245GH, 13CrMo4-5, P355QH1 / W/TStE 355, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, P265GH, P280GH, P355NH, 16Mo3, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)
Threaded (NPT) Flange	EN1092-1/13	DIN 2558 \| 2565 – 2569	PN6, 10, Pn16, 25, 40, 63, 100, 160, 250, 320, PN400	S235JR, P250GH / C 22.8, P245GH, 13CrMo4-5, P355QH1 / W/TStE 355, P265GH, P280GH, P355NH, 16Mo3, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4410 (Superduplex), 1.4462 (Duplex)

Different Types Contact Faces For B16.5 Flanges

Types of Contact Faces	DIN EN 1092-1
Without Raised Face (RF)	Form A
Raised Face (RF)	Form B1
Raised Face (RF)	Form B1
Raised Fac (RF)	Form B2
Tongue According to DIN2512	Form C
Groove According to DIN 2512	Form D
Male According to DIN 2513	Form E
Female According to DIN 2513	Form F

Flange Thickness Calculation For Pressure Vessel

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	……..	……..	……..	……..	……..	……..

Industrial Pipe Flange Bolt Chart

Normal Pipe Size in Inch	Normal Pipe Size in Millimeter	Nunber of Bolts	Bolt Size UNC	Stud Length Of RF	ISO Stud Size	Length Of Machine Bolt
1/2	15	4	1/2	55	M14	50
3/4	20	4	1/2	65	M14	50
1	25	4	1/2	65	M14	55
1 1/4	32	4	1/2	70	M14	55
1 1/2	40	4	1/2	70	M14	65
2	50	4	5/8	85	M16	70
2 1/2	65	4	5/8	90	M16	75
3	80	4	5/8	90	M16	75
3 1/2	90	8	5/8	90	M16	75
4	100	8	5/8	90	M16	75
5	125	8	3/4	95	M20	85
6	150	8	3/4	100	M20	85
8	200	8	3/4	110	M20	90
10	250	12	7/8	115	M24	100
12	300	12	7/8	120	M24	100
14	350	12	1	135	M27	115
16	400	16	1	135	M27	115
18	450	16	1 1/8	145	M30	125
20	500	20	1 1/8	160	M30	140
24	600	20	1 1/4	170	M33	150

ASME B16.5 Flange Gasket Dimensions

NPS	Gasket I.D.	Gasket O.D.
NPS	Gasket I.D.	Class 150	Class 300	Class 400	Class 600	Class 900
1/2	0.84	1.875	2.125	2.125	2.125	2.50
3/4	1.06	2.25	2.625	2.625	2.625	2.75
1	1.31	2.625	2.875	2.875	2.875	3.125
1 1/4	1.66	3	3.25	3.25	3.25	3.50
1 1/2	1.91	3.375	3.75	3.75	3.75	3.875
2	2.38	4.125	4.375	4.375	4.375	5.625
2 1/2	2.88	4.875	5.125	5.125	5.125	6.50
3	3.50	5.375	5.875	5.875	5.875	6.625
4	4.50	6.875	7.125	7.00	7.625	8.125
5	5.56	7.75	8.50	8.375	9.50	9.75
6	6.62	8.75	9.875	9.75	10.50	11.375
8	8.62	11	12.125	12.00	12.625	14.125
10	10.75	13.375	14.25	14.125	15.75	17.125
12	12.75	16.125	16.625	16.50	18.00	19.625