API 6A Flange manufacturer in India

Refer API 6b Blind Flange and 6bx Weld Neck Flange dimensions and API Flange ratings

What is API 6A Flange?
API is the abbreviation for American Petroleum Institute, and the API 6A Flanges have many characteristics which are the same as that of the ASME flanges. They have similar dimensions, but their minimal design requirements for operating pressure start in class 2000#. All the API 6A Flanges come with a Ring Type Joint Face and they need proper gasket for obtaining the optimal quality and performance in the given application. They have a really high-pressure base requirement and this is because of their popular usage in various petrochemical and oilfield applications (volatile nature). Both the upstream and downstream sectors need API 6A Flanges for producing different products that are highly demanded throughout the world.
The API 6A Flanges of class 5000# and below are often made of carbon steel, and they come with a min yield strength of 45K. These flanges are commonly found in the oilfield equipment as they can easily deal with materials like unrefined crude oil, high energy gasses, etc.

Api 6a Flange Leakage Check
In order to do the Api 6a Flange Leakage Check, the following steps can be performed:

• The CNODE anchor should be placed at every flange pair for checking.
• The node name needs to be placed at these points including the size (for multiple sizes) and api pressure class (for multiple pressure classes).
• Next, from CAESAR a local restraint summary needs to be exported followed by flange isolation
• For each size and pressure class, the maximum Fx (axial load) needs to be selected from the local restraint summary.
• Careful construction of the CAESAR model is essential as it allows us to discern between compression and tension; here we have assumed compression = tension for conservatism.
• Next, the Fx value should be rounded up to the next tension level which is listed on the API 6A chart.
• Depending on the relevant design pressure rating, the correlating bending moment could easily be found out.
• The combination of tension and bending moment is the recommended combined limit.
• Calculate sqrt(My**2+Mz**2) for all flanges which equals the bending moment.

Api 6a Studded Tee Vs Api 6a Cross
The Api 6a Studded Tee is a T-shaped pipe fitting with three openings (one inlet and two outlets), used for both combining and dividing the flow of the pipe run. They can also help in changing the flow direction and controlling the flow rate. They are available in different sizes, finishes, etc., and can also be used for transporting mixtures consisting of two fluids.
The Api 6a Cross is a four-sided fittings that have an inlet and three outlets. They usually have a female threaded end, which connects with the male thread on the pipe. They help to create stable grip and also secure the connection.

What is Api 6a Double Studded Adapter Flanges
The Api 6a Double Studded Adapter Flanges are a combination of flanges in various sizes and pressure ratings. They are basically adapter flanges, which are mostly used for high-pressure well-headed as well as normal pressure piping systems.

• They are available in double and single types.
• Their materials can be easily customized.
• Their size and pressure ratings are also customizable very easily.
• There is an availability of matching bolts and nuts for all the materials used in the adapter.
• Also, there is availability of weld overlay.

What is the difference between API 6A Flange and API 6D Flange?
Both the API 6A and API 6D are the standards used in the oil and gas industry for valves. The 6A flanges are mainly used for wellhead and christmas tree equipment whereas the 6D flanges are used for valves in any pipelines. The 6D flanges are more popular and commonly used compared to the 6A flanges. Also, 6D flanges are more easily manufactured than the wellhead flanges.
The pressure ratings for 6A flanges are higher than the 6D flanges. The 6A flanges are rated for 2000 LB to 20000 LB, whereas the 6D flanges are rated from 150 LB to 2500 LB.

API 6A Flange manufacturer in India

AN ISO certified API Flange manufacturers in India offers widest range of Api 6a Double Studded Adapter Flanges, API 6a Forged Flange and API 6a Type 6bx Threaded Flanges in Mumbai

Table of Content

• API 6A Flange Specification List
• API 6a Flange Pressure Temperature Rating
• API 6a 10000 Psi Flange Dimensions
• API 6a 10000 Psi Flange Weight
• API 6A Flange Price List
• Api 6a Flange Sizes
• Api 6a Flange Bolt Torque
• Api 6a Flange Thickness
• Api 6a Rtj Flange Tolerance
• Api 6a Flange Torque Values

• Various Types of API 6a Flange
• Dimensions of API 6A Type 6BX 5000 psi Flange
• API 6A Type 6BX 3000 psi Flange Dimensions Table
• Dimensions Chart of API 6A Type 6BX 2000 psi Flange
• API 6A Type 6B 5000 psi Flange Dimensions
• API Flange Bolt Tightening Sequence
• Applications of API 6a Threaded Flange

API 6A Flange Specification List

Dimensions	ASME B16.5, ASME B16.47 Series A & B, MSS SP44
Size	1/2" to 48"
UNI	6Bar 16Bar 10Bar 25Bar 40Bar
Class	300 LBS, 150 LBS, 900 LBS, 600 LBS, 1500 LBS, 2500 LBS
EN	6Bar 25Bar 10Bar 40Bar 16Bar
BS	BS4504 , BS4504, BS1560, BS10
Flange Face Type Provided By Manufacturer	RF (Raised Face), RTJ (Ring Type Joint)
Value Added Services	CNC Machining, Customised Flanges
Outer diameters	1/2” to 24”
JIS	5K, 16 K 10 K, 20 K, 40 K, 30 K, 63 K
Making Methods Provided By Manufacturer	Casting And Forging Rolling And Cutting
Flanges Test	Hydrostatic testing machine/ UI trasonic flaw detector/ X-ray detector/ Direct-reading Spectrograph/ Magnetic particle detector
Coating/Surface Treatment By Manufacturer	Antirust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized
Flanges Equipment	Pushing Machine/ electric bevelling machine/ Press machine/ Bending machine/ Sand-blasting machine etc
Standards Provided By Manufacturer	EN-1092, DIN, API7S-43, API605, B16.48, ISO70051, MSS S44, ANSI/ASME B16.5, B16.47 Series A & B, BS4504, BS 10, API7S-15, JISB2220, BS1560-3.1, ASME/ANSI B16.5/16.36/16.47A/16.47B, EN1092

API 6b Blind Flange Distributors, dealers, wholesalers, suppliers, importers, stocks, exporters, stockists, and manufacturers in Mumbai.

API 6a Flange Pressure Temperature Rating

Max Working Pressure	2000 PSI	3000 PSI	5000 PSI
Test Pressure	3000 PSI	4500 PSI	7500 PSI
Product Spec Levels	1, 2, 3 and 4	1, 2, 3 and 4	1, 2, 3 and 4
API Temp Rating	K (-60 ° C) to Y (+345 ° C)	K (-60 ° C) to Y (+345 ° C)	K (-60 ° C) to Y (+345 ° C)
Integral, Blind, Target Blind and Test Flanges
Min. Yield	60 000 PSI	60 000 PSI	60 000 PSI
Min. Tensile	85 000 PSI	85 000 PSI	85 000 PSI
Material	American Petroleum Institute 60K	American Petroleum Institute 60K	American Petroleum Institute 60K
Weld Neck Flanges
Min. Yield	45 000 PSI	45 000 PSI	45 000 PSI
Min. Tensile	70 000 PSI	70 000 PSI	70 000 PSI
Material	American Petroleum Institute 45K	American Petroleum Institute 45K	American Petroleum Institute 45K

API 6a 10000 Psi Flange Dimensions

Size-(inches)	B	OD	C	E1	Q (max)	G	K	T	J1	J2	J3	J4	R	BC	N	H	Ring Number BX
1 13/16"	46.8	185	3	-	5.56	77.77	105	42.1	88.9	65.1	48.5	-	10	146.10	8	23	151
2 1/16"	53.2	200	3	-	5.95	86.23	1011	44.1	100.0	74.7	51.6	-	10	158.80	8	23	152
2 9/16"	65.9	230	3	-	6.75	102.77	132	51.2	120.7	92.1	57.2	-	10	184.20	8	26	153
3 1/16"	78.6	270	3	-	7.54	119.00	152	58.4	142.1	110.2	63.5	-	10	215.90	8	29	154
4 1/16"	104.0	315	3	-	8.33	150.62	185	70.3	182.6	146.1	73.1	-	10	258.80	8	32	155
5 1/8"	131.0	360	3	9.5	9.53	176.66	221	79.4	223.8	182.6	81.0	6.4	10	300	12	32	169
7 1/16"	180.2	480	6	11.1	11.11	241.83	302	103.2	301.6	254	95.3	9.7	16	403.20	12	42	156
9"	229.4	550	6	12.7	12.70	299.06	359	123.9	374.7	327.1	93.7	9.7	16	476.30	16	42	157
11"	280.2	655	6	14.3	14.29	357.23	429	141.3	450.9	400.1	103.2	14.2	16	565.20	16	48	158
13 5/8"	346.9	770	6	15.9	15.88	432.64	518	168.3	552.5	495.3	114.3	17.5	16	673.10	20	51	159
16 3/4"	426.2	870	6	8.3	8.33	478.33	576	168.3	655.6	601.7	76.2	30.2	19	776.30	24	51	162
18 3/4"	477.0	1040	6	18.3	18.26	577.90	697	223.1	752.5	674.7	155.6	25.4	16	925.50	24	61	164
21 1/4"	540.5	1145	6	19.1	19.05	647.88	781	241.3	847.7	762.0	165.1	31.8	21	1022.40	24	67	166

Supplier of 100% radiographed API 3000/ 5000/ 10000 Plate Flange, Api 6a Studded Tee and Bx 152/ Bx 154 Pipe Flange in India

API 6a 10000 Psi Flange Weight

NPS In Inch.	DN In MM	Flange Outside Daimeter A In MM	Flange Thickness D In MM	SORF Flange Weight In KG	WN Flange Weight In KG	BLRF Flange Weight In KG
1/ 2	15	88.9	11.2	0.4	0.5	0.4
3/ 4	20	98.6	12.7	0.6	0.7	0.6
1	25	108	14.2	0.8	1	0.9
1 1/ 4	32	117.3	15.7	1	1.3	1.2
1 1/ 2	40	127	17.5	1.3	1.7	1.5
2	50	152.4	19.1	2.1	2.6	2.4
2 1/ 2	65	177.8	22.4	3.3	4.1	3.9
3	80	190.5	23.9	3.9	4.9	4.9
3 1/ 2	90	215.9	23.9	4.8	6.1	6.2
4	100	228.6	23.9	5.3	6.8	7.0
5	125	254	23.9	6.1	8.6	8.6
6	150	279.4	25.4	7.5	10.6	11.3
8	200	342.9	28.4	12.1	17.6	19.6
10	250	406.4	30.2	16.5	24	28.6
12	300	482.6	31.8	26.2	36.5	43.2
14	350	533.4	35.1	34.6	48.4	58.1
16	400	596.9	36.6	44.8	60.6	76.1
18	450	635	39.6	48.9	68.3	93.7
20	500	698.5	42.9	61.9	84.5	122.0
24	600	812.8	47.8	86.9	115	185.0

API 6A Flange Price List

API 6A Flange Price Per Piece in India	API 6b Flange Price in INR	API 6bx Flanges Price in UAE Dirham	API Flange Price in USD
FLANGES WNRTJ 1-13/16 AP10000#SCH12.7 A694 F60 MOC:ASTM A694 F60 API 6BX 10000 Per Unit	8,586	UAE Dirham 422.79	$115.11
FLANGE,BLIND 4 1/16-10000 PSI,API 6A,PSL-2,MAL CLASS DD TEMP CLASS P Per Unit	11,595	UAE Dirham 570.96	$155.45

Before purchasing, compare our pricing to that of other API Flange manufacturers in India. This is an estimate of the cost of API 10000 Flange. Please contact us for the most up-to-date stocklist of API 6a Threaded Flange in Mumbai. We are leading API 6A Flange manufacturer in India.

Api 6a Flange Sizes

Nominal Pipe Size (inch)	Dia. of Flange (inch)	No. of Bolts	Dia. of Bolts (inch)	Dia. of Bolt Holes (inch)	Bolt Circle (inch)
1/4	3-3/8	4	1/2	0.62	2-1/4
3/4	3-7/8	4	1/2	0.62	2-3/4
1	4-1/4	4	1/2	0.62	3-1/8
1/2	3-1/2	4	1/2	0.62	2-3/8
1-1/4	4-5/8	4	1/2	0.62	3-1/2
2	6	4	5/8	0.75	4-3/4
2-1/2	7	4	5/8	0.75	5-1/2
1-1/2	5	4	1/2	0.62	3-7/8
3	7-1/2	4	5/8	0.75	6
3-1/2	8-1/2	8	5/8	0.75	7
4	9	8	5/8	0.75	7-1/2
20	27-1/2	20	1-1/8	1.25	25
6	11	8	3/4	0.88	9-1/2
8	13-1/2	8	3/4	0.88	11-3/4
5	10	8	3/4	0.88	8-1/2
10	16	12	7/8	1	14-1/4
14	21	12	1	1.12	18-3/4
16	23-1/2	16	1	1.12	21-1/4
12	19	12	7/8	1	17
18	25	16	1-1/8	1.25	22-3/4
24	32	20	1-1/4	1.38	29-1/2

Buy flat/ raised face API 6a Type 6b Flange, Api 6a Studded Cross and API 650 Ring Joint Flanges at Unbeatable Prices in Maharashtra

Api 6a Flange Bolt Torque

Size in Inch	Size in mm	No. of Bolt	Bolt Dia.	Thread Type	Bolt Stress lb/in2	Torque lbf.ft.	Torque Nm
1/2	15	4	½”	UNC	25,000	22	30
3/4	20	4	½”	UNC	30,000	26	36
1	35	4	½”	UNC	33,000	29	39
1 ½	40	4	½”	UNC	50,000	44	60
2	50	4	5/8”	UNC	50,000	86	117
3	80	4	5/8”	UNC	50,000	86	117
4	100	8	5/8”	UNC	40,000	69	93
6	150	8	¾”	UNC	45,000	137	185
8	200	8	¾”	UNC	45,000	137	185
10	250	12	7/8”	UNC	40,000	194	263
12	300	12	7/8”	UNC	40,000	194	263
14	350	12	1”	UN8	41,000	296	401
16	400	16	1”	UN8	40,000	289	392
18	450	16	1 1/8”	UN8	40,000	421	571
20	500	20	1 1/8”	UN8	40,000	421	571
24	600	20	1 ¼”	UN8	40,000	588	797

Api 6a Flange Thickness

NPS (Normal Pipe Size)	"A" (O.D.) Outside Daimeter	"B" (Thick.)	"C" (RF Daimeter)	"D" (B.C.D.)	# Bolt Holes	Diameter of Bolt Holes	Apprx. Weight In KG
1/2"	3-1/2	7/16	1-3/8	2-3/8	4	5/8	2
3/4"	3-7/8	1/2	1-11/16	2-3/4	4	5/8	2
1"	4-1/4	9/16	2	3-1/8	4	5/8	2
1-1/4"	4-5/8	5/8	2-1/2	3-1/2	4	5/8	3
1-1/2"	5	11/16	2-7/8	3-7/8	4	5/8	3
2"	6	3/4	3-5/8	4-3/4	4	3/4	4
2-1/2"	7	7/8	4-1/8	5-1/2	4	3/4	7
3"	7-1/2	15/16	5	6	4	3/4	9
3-1/2"	8-1/2	15/16	5-1/2	7	8	3/4	13
4"	9	15/16	6-3/16	7-1/2	8	3/4	17
5"	10	15/16	7-5/16	8-1/2	8	7/8	20
6"	11	1	8-1/2	9-1/2	8	7/8	27
8"	13-1/2	1-1/8	10-5/8	11-3/4	8	7/8	47
10"	16	1-3/16	12-3/4	14-1/4	12	1	67
12"	19	1-1/4	15	17	12	1	123
14"	21	1-3/8	16-1/4	18-3/4	12	1-1/8	139
16"	23-1/2	1-7/16	18-1/2	21-1/4	16	1-1/8	187
18"	25	1-9/16	21	22-3/4	16	1-1/4	217
20"	27-1/2	1-11/16	23	25	20	1-1/4	283
24"	32	1-7/8	27-1/4	29-1/2	20	1-3/8	415

Api 6a Rtj Flange Tolerance

Nominal Size Of Bore	Bore (Maximam)	Outside Diameter (O.D.)	Dimensional Tolerance	Maximam Chamfer
	B	D	D	C
	2000 PSI
26¾	26.78	41	± 0.12	0.25
30	30.03	44.19	± 0.12	0.25
	3000 PSI
26¾	26.78	43.38	± 0.12	0.25
30	30.03	46.68	± 0.12	0.25
	5000 PSI
13.3/8	13.66	26.5	± 0.12	0.25
16¾	16.78	30.38	± 0.12	0.25
18¾	18.78	35.62	± 0.12	0.25
21¾	21.28	39	± 0.12	0.25
	10000 PSI
1.13/16	1.84	7.38	± 0.06	0.12
2.1/16	2.09	7.88	± 0.06	0.12
2.9/16	2.59	9.12	± 0.06	0.12
3.1/16	3.09	10.62	± 0.06	0.12
4.1/16	4.09	12.44	± 0.06	0.12
5.1/8	5.16	14.06	± 0.06	0.12
7.1/16	7.09	18.88	± 0.12	0.25
9	9.03	21.75	± 0.12	0.25
11	11.03	25.75	± 0.12	0.25
13.5/8	13.66	30.25	± 0.12	0.25
16¾	16.78	34.31	± 0.12	0.25
18¾	18.78	40.94	± 0.12	0.25
21¼	21.28	45	± 0.12	0.25
	15000 PSI
1.13/16	1.84	8.19	± 0.06	0.12
2.1/16	2.09	8.75	± 0.06	0.12
2.9/16	2.59	10	± 0.06	0.12
3.1/16	3.09	11.31	± 0.06	0.12
4.1/16	4.09	14.19	± 0.06	0.12
5.1/8	5.16	16.5	± 0.06	0.12
7.1/16	7.09	19.88	± 0.12	0.25
9	9.03	25.5	± 0.12	0.25
11	11.03	32	± 0.12	0.25
13.5/8	13.66	34.88	± 0.12	0.25
18¾	18.78	45.75	± 0.12	0.25
	20000 PSI
1.13/16	1.84	10.12	± 0.06	0.12
2.1/16	2.09	11.31	± 0.06	0.12
2.9/16	2.59	12.81	± 0.06	0.12
3.1/16	3.09	14.06	± 0.06	0.12
4.1/16	4.09	17.56	± 0.06	0.12
7.1/16	7.09	25.81	± 0.12	0.25
9	9.03	31.69	± 0.12	0.25
11	11.03	34.75	± 0.12	0.25
13.5/8	13.66	45.75	± 0.12	0.25
Nominal Size and Bore	Dia Raised Face	Total THK	Large Dia Hub	Small Dia Hub
	F	T	A	E
	2000 PSI
26¾	31.69	4.97	32.91	29.25
30	35.75	5.28	36.69	32.8
	3000 PSI
26¾	32.75	6.34	34.25	30.56
30	36.31	6.58	38.19	34.3
	5000 PSI
13.3/8	18	4.44	18.94	16.69
16¾	21.06	5.13	21.88	20.75
18¾	24.69	6.53	26.56	23.56
21¾	27.62	7.12	29.88	26.75
	10000 PSI
1.13/16	4.12	1.66	3.5	2.56
2.1/16	4.38	1.73	3.94	2.94
2.9/16	5.19	2.02	4.75	3.62
3.1/16	6	2.3	5.59	4.34
4.1/16	7.28	2.77	7.19	5.75
5.1/8	8.69	3.12	8.81	7.19
7.1/16	11.88	4.06	11.88	10
9	14.12	4.88	14.75	12.88
11	16.88	5.56	17.75	15.75
13.5/8	20.38	6.62	21.75	19.5
16¾	22.69	6.62	25.81	23.69
18¾	27.44	8.78	29.62	26.56
21¼	30.75	9.5	33.38	30
	15000 PSI
1.13/16	4.19	1.78	3.84	2.81
2.1/16	4.5	2	4.38	3.25
2.9/16	5.25	2.25	5.06	3.94
3.1/16	6.06	2.53	6.06	4.81
4.1/16	7.62	3.09	7.69	6.25
5.1/8	8.88	3.88	9.62	7.88
7.1/16	12	4.6	12.81	10.88
9	15	5.75	17	13.75
11	17.88	7.38	23	16.81
13.5/8	21.31	8.06	23.44	20.81
18¾	28.44	10.06	32	28.75
	20000 PSI
1.13/16	4.62	2.5	5.25	4.31
2.1/16	5.19	2.81	6.06	5
2.9/16	5.94	3.12	6.81	5.69
3.1/16	6.75	3.38	7.56	6.31
4.1/16	8.62	4.19	9.56	8.12
7.1/16	13.88	6.5	15.19	13.31
9	17.38	8.06	18.94	16.88
11	19.88	8.81	22.31	20
13.5/8	24.19	11.5	27.31	24.75

Api 6a Flange Torque Values

Check API 6BX/ 6B target flanges and API 605 Series A Test Flanges material torque specs, Dimensions, Pressure Class and Weight

Various Types of API 6a Flange

API 6A Flange

Api 6a Double Studded Adapter Flanges

Api 6a Studded Tee

Api 6a Studded Cross

Api 6a Studded Flange

API 6a Weld Neck Flange

API 6a Threaded Flange

API 6a Type 6bx

API 6a Type 6b

API Blind Flange

API 6b Flange

API 6bx Flange

API 5000 Flange

API 10000 Flange

API 650 Flange

Bx 152 Flange

Bx 154 Flange

API 10k Flange

API 5k Flange

API 3000 Flange

API Flange

API 605 Flange

API 605 Series B

API 605 Class 150

API 605 Series A

API 6b Blind Flange

API 6bx Weld Neck Flange

Dimensions of API 6A Type 6BX 5000 psi Flange

Size	B	OD	C	E1	Q (max)	G	K	T	J1	J2	J3	J4	R	BC	N	H	Ring Number BX
13 5/8"	346.9	675	6	14.3	14.29	408.00	457	112.8	481.0	423.9	114.3	23.9	16	590.60	16	45	160
16 3/4"	426.2	770	6	8.3	8.33	478.33	535	130.2	555.6	527.1	76.2	17.5	19	676.30	16	51	162
18 3/4"	477.0	905	6	18.3	18.26	563.50	627	165.9	674.7	598.5	152.4	19.1	16	803.30	20	54	163
21 1/4"	540.5	990	6	19.1	19.05	632.56	702	181.0	758.8	679.5	165.1	22.4	18	885.80	24	54	165

API 6A Type 6BX 3000 psi Flange Dimensions Table

Size-(inches)	B	OD	C	E1	Q (max)	G	K	T	J1	J2	J3	J4	R	BC	N	H	Ring Number BX
26 3/4"	680.2	1100	6	21.4	21.43	774.22	832	161.2	870	776.3	185.7	0	16	1000.10	24	54	168
30"	762.8	1185	6	23	22.62	862.30	922	167.1	970	871.1	196.9	12.7	16	1090.60	32	51	303

Dimensions Chart of API 6A Type 6BX 2000 psi Flange

Size-(inches)	B	OD	C	E1	Q (max)	G	K	T	J1	J2	J3	J4	R	BC	N	H	Ring Number BX
26 3/4"	680.2	1040	6	21.4	21.43	768.33	805	126.3	835.8	743	185.7	9.7	16	952.5	20	48	167
30"	762.8	1120	6	23	22.62	862.30	908	134.2	931.9	833	196.9	17.5	16	1039.80	32	45	303

API 6A Type 6B 5000 psi Flange Dimensions

Size	B1	O	C	K	P	E	X	BC	N	H	Y	A	B2	Ring Number R or RX
2 1/16"	53.2	215	46.1	124	95.25	7.9	104.8	165.1	8	26	109.6	60.3	43.7	24
2 9/16"	65.9	245	49.3	137	107.95	7.9	123.8	190.5	8	29	112.7	73.0	54.9	27
3 1/8"	81.8	265	55.6	168	136.53	7.9	133.3	203.2	8	32	125.4	88.9	67.5	35
4 1/16"	108.7	310	62.0	194	161.93	7.9	161.9	241.3	8	35	131.8	114.3	88.1	39
5 1/8"	131.0	375	81.0	229	193.68	7.9	196.8	292.1	8	42	163.5	141.3	110.3	44
7 1/16"	181.0	395	92.1	248	211.15	9.7	228.6	317.5	12	39	181	168.3	132.6	46
9"	229.4	485	103.2	318	269.88	11.2	292.1	393.7	12	45	223.8	219.1	173.8	50
11"	280.2	585	119.1	371	323.85	11.2	368.3	482.6	12	51	265.1	273	216.7	54

API Flange Bolt Tightening Sequence

Number of Bolt / Stud	Bolt Tightening Sequence to Follow
4 bolt Flange	1, 3, 2, 4
8 bolt Flange	1, 5, 3, 7, 2, 6, 4, 8
12 bolt Flange	1, 7, 4, 10, 2, 8, 5, 11, 3, 9, 6, 12
16 bolt Flange	1, 9, 5, 13, 3, 11, 7, 15, 2, 10, 6, 14, 4, 12, 8, 16
20 bolt Flange	1, 11, 6, 16, 3, 13, 8, 18, 5, 15, 10, 20, 2, 12, 7, 17, 4, 14, 9, 19
24 bolt Flange	1, 13, 7, 19, 4, 16, 10, 22, 2, 14, 8, 20, 5, 17, 11, 23, 6, 18, 12, 24, 3, 15, 9, 21
28 bolt Flange	1, 15, 8, 22, 4, 18, 11, 25, 6, 20, 13, 27, 2, 16, 9, 23, 5, 19, 12, 26, 3, 17, 10, 24, 7, 21, 14, 28
32 bolt Flange	1, 17, 9, 25, 5, 21, 13, 29, 3, 19, 11, 27, 7, 23, 15, 31, 2, 18, 10, 26, 6, 22, 14, 30, 8, 24, 16, 32, 4, 20, 12, 28

Applications of API 6a Threaded Flange

• Fossil Fuel Power Plants
• Marine Applications
• Ship Building
• Oil And Gas Industry
• Refineries
• Paper & Pulp
• Nuclear Power
• Power Plants