Weld Neck Flange

A weld neck flange (also known as a high-hub flange and tapered hub flange

) is a type of flange. Weld Neck Flange is easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.

There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant. A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.

Such flanges are suitable for use in hostile environments that have extremes of temperature, pressure or other sources of stress. The resilience of this type of flange is achieved by sharing the environmental stress with the pipe with which it is welded. This type of flange has been used successfully at pressures up to 5,000 psi.

These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radio-graphed for flaw detection.

Weld neck flange will be welded to a pipe or fitting with a single full penetration, V weld (Butt-weld).

Flange Type	Welding Neck flange, Slip-On; Socket Welding, Blind, Thread, Lap-joint; Long Welding Neck; Orifice; All flanges in Raised Face, Flat face and RTJ;
Material	ASTM A105; A350 LF2; A694 F42, F46, F52, F56, A182 F12/F22/F5/F9/ F91; A182 F304/F304L/F316/F316L, etc.
Size	1/2”~60”, as the clients’ requests;
Pressure	Class: 150 300 400 600 900 1500 2500; PN6,PN10,PN16,PN25,PN40;5K,10K,16K,20K,30K
Standard	ASME B16.5, ASME B16.47, MSS SP43, EN1092，DIN, JIS;

Class 150 lb

Pipe		Flange Data				Hub Data		Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Inside Diameter	Flange Thickness min	Overall Length	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	kg/ piece
	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		in mm	in mm
1/2	0.840 21.30	3.500 88.90	0.620 15.70	0.440 11.20	1.880 47.80	0.840 21.30	1.190 30.20	1.380 35.00	4	0.620 15.70	2.380 60.45	0.48
3/4	1.050 26.70	3.880 98.60	0.820 20.80	0.500 12.70	2.060 52.30	1.050 26.70	1.500 38.10	1.690 42.90	4	0.620 15.70	2.750 69.85	0.71
1	1.315 33.40	4.250 108.0	1.050 26.70	0.560 14.20	2.190 55.60	1.320 33.50	1.940 49.30	2.000 50.80	4	0.620 15.70	3.120 79.25	1.01
1 1/4	1.660 42.20	4.620 117.3	1.380 35.10	0.620 15.70	2.250 57.15	1.660 42.20	2.310 58.70	2.500 63.50	4	0.620 15.70	3.500 88.90	1.33
1 1/2	1.900 48.30	5.000 127.0	1.610 40.90	0.690 17.50	2.440 62.00	1.900 48.30	2.560 65.00	2.880 73.15	4	0.620 15.70	3.880 98.60	1.72
2	2.375 60.30	6.000 152.4	2.070 52.60	0.750 19.10	2.500 63.50	2.380 60.45	3.060 77.70	3.620 91.90	4	0.750 19.10	4.750 120.7	2.58
2 1/2	2.875 73.00	7.000 177.8	2.470 62.70	0.880 22.40	2.750 69.85	2.880 73.15	3.560 90.40	4.120 104.6	4	0.750 19.10	5.500 139.7	4.11
3	3.500 88.90	7.500 190.5	3.070 78.00	0.940 23.90	2.750 69.85	3.500 88.90	4.250 108.0	5.000 127.0	4	0.750 19.10	6.000 152.4	4.92
31/2	4.000 101.6	8.500 215.9	3.550 90.20	0.940 23.90	2.810 71.40	4.000 101.6	4.810 122.2	5.500 139.7	8	0.750 19.10	7.000 177.8	6.08
4	4.500 114.3	9.000 228.6	4.030 102.4	0.940 23.90	3.000 76.20	4.500 114.3	5.310 134.9	6.190 157.2	8	0.750 19.10	7.500 190.5	6.84
5	5.563 141.3	10.00 254.0	5.050 128.3	0.940 23.90	3.500 88.90	5.560 141.2	6.440 163.6	7.310 185.7	8	0.880 22.40	8.500 215.9	8.56
6	6.625 168.3	11.00 279.4	6.070 154.2	1.000 25.40	3.500 88.90	6.630 168.4	7.560 192.0	8.500 215.9	8	0.880 22.40	9.500 241.3	10.6
8	8.625 219.1	13.50 342.9	7.980 202.7	1.120 28.40	4.000 101.6	8.630 219.2	9.690 246.1	10.62 269.7	8	0.880 22.40	298.5 11.75	17.6
10	10.75 273.0	16.00 406.4	10.02 254.5	1.190 30.20	4.000 101.6	10.75 273.0	12.00 304.8	12.75 323.8	12	1.000 25.40	14.25 362.0	24
12	12.75 323.8	19.00 482.6	12.00 304.8	1.250 31.75	4.500 114.3	12.75 323.8	14.38 365.3	15.00 381.0	12	1.000 25.40	17.00 431.8	36.5
14	14.00 355.6	21.00 533.4	To be specified by Purchaser	1.380 35.10	5.000 127.0	14.00 355.6	15.75 400.1	16.25 412.7	12	1.120 28.40	18.75 476.3	48.4
16	16.00 406.4	23.50 596.9		1.440 36.60	5.000 127.0	16.00 406.4	18.00 475.2	18.50 469.9	16	1.120 28.40	21.25 539.8	60.6
18	18.00 457.2	25.00 635.0		1.560 39.60	5.500 139.7	18.00 457.2	19.88 505.0	21.00 533.4	16	1.250 31.75	22.75 577.9	68.3
20	20.00 508.0	27.50 698.5		1.690 42.90	5.690 144.5	20.00 508.0	22.00 558.8	23.00 584.2	20	1.250 31.75	25.00 635.0	84.5
24	24.00 609.6	32.00 812.8		1.880 47.80	6.000 152.4	24.00 609.6	26.12 663.4	27.25 692.1	20	1.380 35.10	29.50 749.3	115

Class 300 lb

Pipe		Flange Data				Hub Data		Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Inside Diameter	Flange Thickness min	Overall Length	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	kg/ piece
	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		in mm	in mm
1/2	0.840 21.30	3.750 95.20	0.620 15.70	0.560 14.20	2.060 52.30	0.840 21.30	1.500 38.10	1.380 35.00	4	0.620 15.70	2.620 66.55	0.75
3/4	1.050 26.70	4.620 117.3	0.820 20.80	0.620 15.70	2.250 57.15	1.050 26.70	1.880 47.70	1.690 42.90	4	0.750 19.00	3.250 82.50	1.26
1	1.315 33.40	4.880 123.9	1.050 26.70	0.690 17.50	2.440 62.00	1.320 33.50	2.120 53.80	2.000 50.80	4	0.750 19.00	3.500 88.90	1.52
1 1/4	1.660 42.20	5.250 133.3	1.380 35.10	0.750 19.00	2.560 65.00	1.660 42.20	2.500 63.50	2.500 63.50	4	0.750 19.00	3.880 98.50	2.03
1 1/2	1.900 48.30	6.120 155.4	1.610 40.90	0.810 20.60	2.690 68.30	1.900 48.30	2.750 69.85	2.880 73.15	4	0.880 22.30	4.500 114.3	2.89
2	2.375 60.30	6.500 165.1	2.070 52.60	0.880 22.30	2.750 69.85	2.380 60.45	3.310 84.00	3.620 91.90	8	0.750 19.00	5.000 127.0	3.4
2 1/2	2.875 73.00	7.500 190.5	2.470 62.70	1.000 25.40	3.000 76.20	2.880 73.15	3.940 100.0	4.120 104.6	8	0.880 22.30	5.880 149.3	5.17
3	3.500 88.90	8.250 209.5	3.070 78.00	1.120 28.40	3.120 79.25	3.500 88.90	4.620 117.3	5.000 127.0	8	0.880 22.30	6.620 168.1	6.93
31/2	4.000 101.6	9.000 228.6	3.550 90.20	1.190 30.20	3.190 81.00	4.000 101.6	5.250 133.3	5.500 139.7	8	0.880 22.30	7.250 184.1	8.67
4	4.500 114.3	10.00 254.0	4.030 102.4	1.250 31.70	3.380 85.80	4.500 114.3	5.750 146.0	6.190 157.2	8	0.880 22.30	7.880 200.1	11.2
5	5.563 141.3	11.00 279.4	5.050 128.3	1.380 35.00	3.880 98.50	5.560 141.2	7.000 177.8	7.310 185.7	8	0.880 22.30	9.250 234.9	15.1
6	6.625 168.3	12.50 317.5	6.070 154.2	1.440 36.50	3.880 98.50	6.630 168.4	8.120 206.2	8.500 215.9	12	0.880 22.30	10.62 269.7	19.1
8	8.625 219.1	15.00 381.0	7.980 202.7	1.620 41.10	4.380 111.2	8.630 219.2	10.25 260.3	10.62 269.7	12	1.000 25.40	13.00 330.2	29.9
10	10.75 273.0	17.50 444.5	10.02 254.5	1.880 47.70	4.620 117.3	10.75 273.0	12.62 320.5	12.75 323.8	16	1.120 28.40	15.25 387.3	42.7
12	12.75 323.8	20.50 520.7	12.00 304.8	2.000 50.80	5.120 130.0	12.75 323.8	14.75 374.6	15.00 381.0	16	1.250 31.70	17.75 450.8	61.8
14	14.00 355.6	23.00 584.2	To be specified by Purchaser	2.120 53.80	5.620 142.7	14.00 355.6	16.75 425.4	16.25 412.7	20	1.250 31.70	20.25 514.3	85.8
16	16.00 406.4	25.50 647.7		2.250 57.15	5.750 146.0	16.00 406.4	19.00 482.6	18.50 469.9	20	1.380 35.00	22.50 571.5	106
18	18.00 457.2	28.00 711.2		2.380 60.45	6.250 158.7	18.00 457.2	21.00 533.4	21.00 533.4	24	1.380 35.00	24.75 628.6	131
20	20.00 508.0	30.50 774.7		2.500 63.50	6.380 162.0	20.00 508.0	23.12 587.2	23.00 584.2	24	1.380 35.00	27.00 685.8	158
24	24.00 609.6	36.00 914.4		2.750 69.85	6.620 168.1	24.00 609.6	27.62 701.5	27.25 692.1	24	1.620 41.10	32.00 812.8	230

Notes
- Dimension B corresponds to the pipe inside diameter. Values quoted assume 40S/Standard wall thickness.
- Weights are based on manufacturer’s data and are approximate.
- Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard)

Class 400 lb

Pipe		Flange Data				Hub Data		Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Inside Diameter	Flange Thickness min	Overall Length	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	kg/ piece
	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		in mm	in mm
1/2	0.840 21.30	3.750 95.30	To be specified by Purchaser	0.560 14.20	2.060 52.30	0.840 21.30	1.500 38.10	1.380 35.00	4	0.620 15.70	2.620 66.55	0.87
3/4	1.050 26.70	4.620 117.3		0.620 15.70	2.250 57.15	1.050 26.70	1.880 47.80	1.690 42.90	4	0.750 19.10	3.250 82.60	1.45
1	1.315 33.40	4.880 124.0		0.690 17.50	2.440 62.00	1.320 33.50	2.120 53.80	2.000 50.80	4	0.750 19.10	3.500 88.90	1.76
1 1/4	1.660 42.20	5.250 133.4		0.810 20.60	2.620 66.55	1.660 42.20	2.500 63.50	2.500 63.50	4	0.750 19.10	3.880 98.60	2.49
1 1/2	1.900 48.30	6.120 155.4		0.880 22.40	2.750 69.85	1.900 48.30	2.750 69.85	2.880 73.15	4	0.880 22.40	4.500 114.3	3.49
2	2.375 60.30	6.500 165.1		1.000 25.40	2.880 73.15	2.380 60.45	3.310 84.10	3.620 91.90	8	0.750 19.10	5.000 127.0	4.36
2 1/2	2.875 73.00	7.500 190.5		1.120 28.40	3.120 79.25	2.880 73.15	3.940 100.1	4.120 104.6	8	0.880 22.40	5.880 149.4	6.43
3	3.500 88.90	8.250 209.6		1.250 31.75	3.250 82.60	3.500 88.90	4.620 117.3	5.000 127.0	8	0.880 22.40	6.620 168.1	8.53
31/2	4.000 101.6	9.000 228.6		1.380 35.10	3.380 85.90	4.000 101.6	5.250 133.4	5.500 139.7	8	1.000 25.40	7.250 184.2	10.7
4	4.500 114.3	10.00 254.0		1.380 35.10	3.500 88.90	4.500 114.3	5.750 146.1	6.190 157.2	8	1.000 25.40	7.880 200.2	12.8
5	5.563 141.3	11.00 279.4		1.500 38.10	4.000 101.6	5.560 141.2	7.000 177.8	7.310 185.7	8	1.000 25.40	9.250 235.0	16.9
6	6.625 168.3	12.50 317.5		1.620 41.10	4.060 103.1	6.630 168.4	8.120 206.2	8.500 215.9	12	1.000 25.40	10.62 269.7	22
8	8.625 219.1	15.00 381.0		1.880 47.80	4.620 117.3	8.630 219.2	10.25 260.4	10.62 269.7	12	1.120 28.40	13.00 330.2	34.7
10	10.75 273.0	17.50 444.5		2.120 53.80	4.880 124.0	10.75 273.0	12.62 320.5	12.75 323.8	16	1.250 31.75	15.25 387.4	48.5
12	12.75 323.8	20.50 520.7		2.250 57.15	5.380 136.7	12.75 323.8	14.75 374.7	15.00 381.0	16	1.380 35.10	17.75 450.9	69.6
14	14.00 355.6	23.00 584.2		2.380 60.45	5.880 149.4	14.00 355.6	16.75 425.5	16.25 412.7	20	1.380 35.10	20.25 514.4	95.5
16	16.00 406.4	25.50 647.7		2.500 63.50	6.000 152.4	16.00 406.4	19.00 482.6	18.50 469.9	20	1.500 38.10	22.50 571.5	118
18	18.00 457.2	28.00 711.2		2.620 66.55	6.500 165.1	18.00 457.2	21.00 533.4	21.00 533.4	24	1.500 38.10	24.75 628.7	145
20	20.00 508.0	30.50 774.7		2.750 69.85	6.620 168.1	20.00 508.0	23.12 587.2	23.00 584.2	24	1.620 41.10	27.00 685.8	173
24	24.00 609.6	36.00 914.4		3.000 76.20	6.880 174.8	24.00 609.6	27.62 701.5	27.25 692.1	24	1.880 47.80	32.00 812.8	249

Class 600 lb

Pipe		Flange Data				Hub Data		Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Inside Diameter	Flange Thickness min	Overall Length	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	kg/ piece
	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		in mm	in mm
1/2	0.840 21.30	3.750 95.30	To be specified by Purchaser	0.560 14.20	2.060 52.30	0.840 21.30	1.500 38.10	1.380 35.00	4	0.620 15.70	2.620 66.55	0.87
3/4	1.050 26.70	4.620 117.3		0.620 15.70	2.250 57.15	1.050 26.70	1.880 47.80	1.690 42.90	4	0.750 19.10	3.250 82.60	1.45
1	1.315 33.40	4.880 124.0		0.690 17.50	2.440 62.00	1.320 33.50	2.120 53.80	2.000 50.80	4	0.750 19.10	3.500 88.90	1.76
1 1/4	1.660 42.20	5.250 133.4		0.810 20.60	2.620 66.55	1.660 42.20	2.500 63.50	2.500 63.50	4	0.750 19.10	3.880 98.60	2.49
1 1/2	1.900 48.30	6.120 155.4		0.880 22.40	2.750 69.85	1.900 48.30	2.750 69.85	2.880 73.15	4	0.880 22.40	4.500 114.3	3.49
2	2.375 60.30	6.500 165.1		1.000 25.40	2.880 73.15	2.380 60.45	3.310 84.10	3.620 91.90	8	0.750 19.10	5.000 127.0	4.36
2 1/2	2.875 73.00	7.500 190.5		1.120 28.40	3.120 79.25	2.880 73.15	3.940 100.1	4.120 104.6	8	0.880 22.40	5.880 149.4	6.43
3	3.500 88.90	8.250 209.6		1.250 31.75	3.250 82.60	3.500 88.90	4.620 117.3	5.000 127.0	8	0.880 22.40	6.620 168.1	8.53
31/2	4.000 101.6	9.000 228.6		1.380 35.10	3.380 85.90	4.000 101.6	5.250 133.4	5.500 139.7	8	1.000 25.40	7.250 184.2	10.7
4	4.500 114.3	10.75 273.1		1.500 38.10	4.000 101.6	4.500 114.3	6.000 152.4	6.190 157.2	8	1.000 25.40	8.500 215.9	17.4
5	5.563 141.3	13.00 330.2		1.750 44.50	4.500 114.3	5.560 141.2	7.440 189.0	7.310 185.7	8	1.120 28.40	10.50 266.7	29.2
6	6.625 168.3	14.00 355.6		1.880 47.80	4.620 117.3	6.630 168.4	8.750 222.3	8.500 215.9	12	1.120 28.40	292.1 11.50	34.9
8	8.625 219.1	16.50 419.1		2.190 55.60	5.250 133.4	8.630 219.2	10.75 273.1	10.62 269.7	12	1.250 31.75	13.75 349.3	53.9
10	10.75 273.0	20.00 508.0		2.500 63.50	6.000 152.4	10.75 273.0	13.50 342.9	12.75 323.8	16	1.380 35.10	17.00 431.8	86.5
12	12.75 323.8	22.00 558.8		2.620 66.55	6.120 155.4	12.75 323.8	15.75 400.1	15.00 381.0	20	1.380 35.10	19.25 489.0	103
14	14.00 355.6	23.75 603.3		2.750 69.85	6.500 165.1	14.00 355.6	17.00 431.8	16.25 412.7	20	1.500 38.10	20.75 527.1	122
16	16.00 406.4	27.00 685.8		3.000 76.20	7.000 177.8	16.00 406.4	19.50 495.3	18.50 469.9	20	1.620 41.10	23.75 603.3	170
18	18.00 457.2	29.25 743.0		3.250 82.60	7.250 184.2	18.00 457.2	21.50 546.1	21.00 533.4	20	1.750 44.50	25.75 654.1	204
20	20.00 508.0	32.00 812.8		3.500 88.90	7.500 190.5	20.00 508.0	24.00 609.6	23.00 584.2	24	1.750 44.50	28.50 723.9	254
24	24.00 609.6	37.00 939.8		4.000 101.6	8.000 203.2	24.00 609.6	28.25 717.6	27.25 692.1	24	2.000 50.80	33.00 838.2	358

Class 900 lb

Pipe		Flange Data				Hub Data		Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Inside Diameter	Flange Thickness min	Overall Length	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	kg/ piece
	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		in mm	in mm
1/2	0.840 21.30	4.750 120.6	To be specified by Purchaser	0.880 22.30	2.380 60.45	0.840 21.30	1.500 38.10	1.380 35.00	4	0.880 22.30	3.250 82.50	1.87
3/4	1.050 26.70	5.120 130.0		1.000 25.40	2.750 69.85	1.050 26.70	1.750 44.00	1.690 42.90	4	0.880 22.30	3.500 88.90	2.56
1	1.315 33.40	5.880 149.3		1.120 28.40	2.880 73.15	1.320 33.50	2.060 52.30	2.000 50.80	4	1.000 25.40	4.000 101.6	3.74
1 1/4	1.660 42.20	6.250 158.7		1.120 28.40	2.880 73.15	1.660 42.20	2.500 63.50	2.500 63.50	4	1.000 25.40	4.380 111.2	4.33
1 1/2	1.900 48.30	7.000 177.8		1.250 31.70	3.250 82.50	1.900 48.30	2.750 69.85	2.880 73.15	4	1.120 28.40	4.880 123.9	5.94
2	2.375 60.30	8.500 215.9		1.500 38.10	4.000 101.6	2.380 60.45	4.120 104.6	3.620 91.90	8	1.000 25.40	6.500 165.1	10.8
2 1/2	2.875 73.00	9.620 244.3		1.620 41.10	4.120 104.6	2.880 73.15	4.880 123.9	4.120 104.6	8	1.120 28.40	7.500 190.5	15
3	3.500 88.90	9.500 241.3		1.500 38.10	4.000 101.6	3.500 88.90	5.000 127.0	5.000 127.0	8	1.000 25.40	7.500 190.5	13.7
4	4.500 114.3	11.50 292.1		1.750 44.40	4.500 114.3	4.500 114.3	6.250 158.7	6.190 157.2	8	1.250 31.70	9.250 234.9	22.5
5	5.563 141.3	13.75 349.2		2.000 50.80	5.000 127.0	5.560 141.2	7.500 190.5	7.310 185.7	8	1.380 35.00	279.4 11.00	37.4
6	6.625 168.3	15.00 381.0		2.190 55.60	5.500 139.7	6.630 168.4	9.250 234.9	8.500 215.9	12	1.250 31.70	12.50 317.5	47.7
8	8.625 219.1	18.50 469.9		2.500 63.50	6.380 162.0	8.630 219.2	11.75 298.4	10.62 269.7	12	1.500 38.10	15.50 393.7	81.3
10	10.75 273.0	21.50 546.1		2.750 69.85	7.250 184.1	10.75 273.0	14.50 368.3	12.75 323.8	16	1.500 38.10	18.50 469.9	119
12	12.75 323.8	24.00 609.6		3.120 79.25	7.880 200.1	12.75 323.8	16.50 419.1	15.00 381.0	20	1.500 38.10	21.00 533.4	157
14	14.00 355.6	25.25 641.3		3.380 85.80	8.380 212.8	14.00 355.6	17.75 450.8	16.25 412.7	20	1.620 41.10	22.00 558.8	180
16	16.00 406.4	27.75 704.8		3.500 88.90	8.500 215.9	16.00 406.4	20.00 508.0	18.50 469.9	20	1.750 44.40	24.25 615.9	217
18	18.00 457.2	31.00 787.4		4.000 101.6	9.000 228.6	18.00 457.2	22.25 565.1	21.00 533.4	20	2.000 50.80	27.00 685.8	292
20	20.00 508.0	33.75 857.2		4.250 107.9	9.750 247.6	20.00 508.0	24.50 622.3	23.00 584.2	20	2.120 53.80	29.50 749.3	362
24	24.00 609.6	41.00 1041.4		5.500 139.7	11.50 292.1	24.00 609.6	29.50 749.3	27.25 692.1	20	2.620 66.55	35.50 901.7	665

Class 1500 lb

Pipe		Flange Data				Hub Data		Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Inside Diameter	Flange Thickness min	Overall Length	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	kg/ piece
	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		in mm	in mm
1/2	0.840 21.30	4.750 120.6	To be specified by Purchaser	0.880 22.30	2.380 60.45	0.840 21.30	1.500 38.10	1.380 35.00	4	0.880 22.30	3.250 82.50	1.87
3/4	1.050 26.70	5.120 130.0		1.000 25.40	2.750 69.85	1.050 26.70	1.750 44.00	1.690 42.90	4	0.880 22.30	3.500 88.90	2.56
1	1.315 33.40	5.880 149.3		1.120 28.40	2.880 73.15	1.320 33.50	2.060 52.30	2.000 50.80	4	1.000 25.40	4.000 101.6	3.74
1 1/4	1.660 42.20	6.250 158.7		1.120 28.40	2.880 73.15	1.660 42.20	2.500 63.50	2.500 63.50	4	1.000 25.40	4.380 111.2	4.33
1 1/2	1.900 48.30	7.000 177.8		1.250 31.70	3.250 82.50	1.900 48.30	2.750 69.85	2.880 73.15	4	1.120 28.40	4.880 123.9	5.94
2	2.375 60.30	8.500 215.9		1.500 38.10	4.000 101.6	2.380 60.45	4.120 104.6	3.620 91.90	8	1.000 25.40	6.500 165.1	10.8
2 1/2	2.875 73.00	9.620 244.3		1.620 41.10	4.120 104.6	2.880 73.15	4.880 123.9	4.120 104.6	8	1.120 28.40	7.500 190.5	15
3	3.500 88.90	10.50 266.7		1.880 47.70	4.620 177.3	3.500 88.90	5.250 133.3	5.000 127.0	8	1.250 31.70	8.000 203.2	19.9
4	4.500 114.3	12.25 311.1		2.120 53.80	4.880 123.9	4.500 114.3	6.380 162.0	6.190 157.2	8	1.380 35.00	9.500 241.3	29.9
5	5.563 141.3	14.75 374.6		2.880 73.15	6.120 155.4	5.560 141.2	7.750 196.8	7.310 185.7	8	1.620 41.10	292.1 11.50	55.4
6	6.625 168.3	15.50 393.7		3.250 82.50	6.750 171.4	6.630 168.4	9.000 228.6	8.500 215.9	12	1.500 38.10	12.50 317.5	68.4
8	8.625 219.1	19.00 482.6		3.620 91.90	8.380 212.8	8.630 219.2	11.50 292.1	10.62 269.7	12	1.750 44.40	15.50 393.7	117
10	10.75 273.0	23.00 584.2		4.250 107.9	10.00 254.0	10.75 273.0	14.50 368.3	12.75 323.8	12	2.000 50.80	19.00 482.6	194
12	12.75 323.8	26.50 673.1		4.880 123.9	11.12 282.4	12.75 323.8	17.75 450.8	15.00 381.0	16	2.120 53.80	22.50 571.5	288
14	14.00 355.6	29.50 749.3		5.250 133.3	11.75 298.4	14.00 355.6	19.50 495.3	16.25 412.7	16	2.380 60.45	25.00 635.0	380
16	16.00 406.4	32.50 825.5		5.750 146.0	12.25 311.1	16.00 406.4	21.75 552.4	18.50 469.9	16	2.620 66.55	27.75 704.8	485
18	18.00 457.2	36.00 914.4		6.380 162.0	12.88 327.1	18.00 457.2	23.50 596.9	21.00 533.4	16	2.880 73.15	30.50 774.7	644
20	20.00 508.0	38.75 984.2		7.000 177.8	14.00 355.6	20.00 508.0	25.25 641.3	23.00 584.2	16	3.120 79.25	32.75 831.8	775
24	24.00 609.6	46.00 1168.4		8.000 203.2	16.00 406.4	24.00 609.6	30.00 762.0	27.25 692.1	16	3.620 91.90	39.00 990.6	1232

Class 2500 lb

Pipe		Flange Data				Hub Data		Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Inside Diameter	Flange Thickness min	Overall Length	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	kg/ piece
	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		in mm	in mm
1/2	0.840 21.30	5.250 133.4	To be specified by Purchaser	1.190 30.20	2.880 73.15	0.840 21.30	1.690 42.90	1.380 35.00	4	0.880 22.40	3.500 88.90	3.12
3/4	1.050 26.70	5.500 139.7		1.250 31.75	3.120 79.25	1.050 26.70	2.000 50.80	1.690 42.90	4	0.880 22.40	3.750 95.30	3.7
1	1.315 33.40	6.250 158.8		1.380 35.10	3.500 88.90	1.320 33.50	2.250 57.15	2.000 50.80	4	1.000 25.40	4.250 108.0	5.24
1 1/4	1.660 42.20	7.250 184.2		1.500 38.10	3.750 95.30	1.660 42.20	2.880 73.15	2.500 63.50	4	1.120 28.40	5.120 130.0	7.74
1 1/2	1.900 48.30	8.000 203.2		1.750 44.50	4.380 111.3	1.900 48.30	3.120 79.25	2.880 73.15	4	1.250 31.75	5.750 146.1	10.9
2	2.375 60.30	9.250 235.0		2.000 50.80	5.000 127.0	2.380 60.45	3.750 95.30	3.620 91.90	8	1.120 28.40	6.750 171.5	16.2
2 1/2	2.875 73.00	10.50 266.7		2.250 57.15	5.620 142.7	2.880 73.15	4.500 114.3	4.120 104.6	8	1.250 31.75	7.750 196.9	23.7
3	3.500 88.90	12.00 304.8		2.620 66.55	6.620 168.1	3.500 88.90	5.250 133.4	5.000 127.0	8	1.380 35.10	9.000 228.6	36.2
4	4.500 114.3	14.00 355.6		3.000 76.20	7.500 190.5	4.500 114.3	6.500 165.1	6.190 157.2	8	1.620 41.10	10.75 273.1	55.3
5	5.563 141.3	16.50 419.1		3.620 91.90	9.000 228.6	5.560 141.2	8.000 203.2	7.310 185.7	8	1.880 47.80	12.75 323.9	92.5
6	6.625 168.3	19.00 482.6		4.250 108.0	10.75 273.1	6.630 168.4	9.250 235.0	8.500 215.9	8	2.120 53.80	14.50 368.3	143
8	8.625 219.1	21.75 552.5		5.000 127.0	12.50 317.5	8.630 219.2	12.00 304.8	10.62 269.7	12	2.120 53.80	17.25 438.2	215
10	10.75 273.0	26.50 673.1		6.500 165.1	16.50 419.1	10.75 273.0	14.75 374.7	12.75 323.8	12	2.620 66.55	21.25 539.8	406
12	12.75 323.8	30.00 762.0		7.250 184.2	18.25 463.6	12.75 323.8	17.38 441.5	15.00 381.0	12	2.880 73.15	24.38 619.3	572

Notes
- Dimension B corresponds to the pipe inside diameter. Values quoted assume 40S/Standard wall thickness.
- Weights are based on manufacturer’s data and are approximate. Previous:Lap joint flange
Next:Weld Neck Flange

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