Threaded Flange

Threaded flanges look very similar to Slip-On flanges but the main difference is that the threaded flange has been was bored out to match a specific pipe inside diameter. The backside of this center opening is then threaded with the relevant-sized tapered pipe thread.

Threaded Flanges are used for special circumstances with their main advantage being that they can be attached to the pipe without welding. Sometimes a seal weld is also used in conjunction with the threaded connection.

Although still available in most sizes and pressure ratings, screwed fittings today are used almost exclusively in smaller pipe sizes.

A threaded flange or fitting is not suitable for a pipe system with thin wall thickness, because cutting thread on a pipe is not possible. Thus, thicker wall thickness must be chosen at least equal to schedule 80 of ASME B36.10

Flange Type	Slip-On; Welding Neck, 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	Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Flange Thickness min	Overall Length	Threaded length min	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
1/2	0.840 21.30	3.500 88.90	0.440 11.20	0.620 15.70	0.620 15.70	1.190 30.20	1.380 35.10	4	0.620 15.70	2.380 60.45	0.39
3/4	1.050 26.70	3.880 98.60	0.500 12.70	0.620 15.70	0.620 15.70	1.500 38.10	1.690 42.90	4	0.620 15.70	2.750 69.85	0.56
1	1.315 33.40	4.250 108.0	0.560 14.20	0.690 17.50	0.690 17.50	1.940 49.30	2.000 50.80	4	0.620 15.70	3.120 79.25	0.78
1 1/4	1.660 42.20	4.620 117.3	0.620 15.70	0.810 20.60	0.810 20.60	2.310 58.70	2.500 63.50	4	0.620 15.70	3.500 88.90	1.03
1 1/2	1.900 48.30	5.000 127.0	0.690 17.50	0.880 22.40	0.880 22.30	2.560 65.00	2.880 73.15	4	0.620 15.70	3.880 98.60	1.32
2	2.375 60.30	6.000 152.4	0.750 19.10	1.000 25.40	1.000 25.40	3.060 77.70	3.620 91.90	4	0.750 19.10	4.750 120.7	2.06
2 1/2	2.875 73.00	7.000 177.8	0.880 22.40	1.120 28.40	1.120 28.40	3.560 90.40	4.120 104.6	4	0.750 19.10	5.500 139.7	3.28
3	3.500 88.90	7.500 190.5	0.940 23.90	1.190 30.20	1.190 30.20	4.250 108.0	5.000 127.0	4	0.750 19.10	6.000 152.4	3.85
3 1/2	4.000 101.6	8.500 215.9	0.940 23.90	1.250 31.75	1.250 31.75	4.810 122.2	5.500 139.7	8	0.750 19.10	7.000 177.8	4.81
4	4.500 114.3	9.000 228.6	0.940 23.90	1.310 33.30	1.310 33.30	5.310 134.9	6.190 157.2	8	0.750 19.10	7.500 190.5	5.3
5	5.563 141.3	10.00 254.0	0.940 23.90	1.440 36.60	1.440 36.60	6.440 163.6	7.310 185.7	8	0.880 22.40	8.500 215.9	6.07
6	6.625 168.3	11.00 279.4	1.000 25.40	1.560 39.60	1.560 39.60	7.560 192.0	8.500 215.9	8	0.880 22.40	9.500 241.3	7.45
8	8.625 219.1	13.50 342.9	1.120 28.40	1.750 44.50	1.750 44.50	9.690 246.1	10.62 269.7	8	0.880 22.40	298.5 11.75	12.1
10	10.75 273.0	16.00 406.4	1.190 30.20	1.940 49.30	1.940 49.30	12.00 304.8	12.75 323.9	12	1.000 25.40	14.25 362.0	16.5
12	12.75 323.8	19.00 482.6	1.250 31.75	2.190 55.60	2.190 55.60	14.38 365.3	15.00 381.0	12	1.000 25.40	17.00 431.8	26.2
14	14.00 355.6	21.00 533.4	1.380 35.10	2.250 57.15	2.250 57.15	15.75 400.1	16.25 412.7	12	1.120 28.40	18.75 476.3	34.6
16	16.00 406.4	23.50 596.9	1.440 36.60	2.500 63.50	2.500 63.50	18.00 457.2	18.50 469.9	16	1.120 28.40	21.25 539.8	44.8
18	18.00 457.2	25.00 635.0	1.560 39.60	2.690 68.30	2.690 68.30	19.88 505.0	21.00 533.4	16	1.250 31.75	22.75 577.9	48.9
20	20.00 508.0	27.50 698.5	1.690 42.90	2.880 73.15	2.880 73.15	22.00 558.8	23.00 584.2	20	1.250 31.75	25.00 635.0	61.9
24	24.00 609.6	32.00 812.8	1.880 47.80	3.250 82.60	3.250 82.60	26.12 663.4	27.25 692.2	20	1.380 35.10	29.50 749.3	86.9

Class 300 lb

Pipe		Flange Data					Hub	Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Counterbore min	Flange Thickness min	Overall Length	Threaded length min	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	0.930 23.60	0.560 14.20	0.880 22.30	0.620 15.70	1.500 38.10	1.380 35.00	4	0.620 15.70	2.620 66.55	0.64
3/4	1.050 26.70	4.620 117.3	1.140 29.00	0.620 15.70	1.000 25.40	0.620 15.70	1.880 47.70	1.690 42.90	4	0.750 19.00	3.250 82.50	1.12
1	1.315 33.40	4.880 123.9	1.410 35.80	0.690 17.50	1.060 26.90	0.690 17.50	2.120 53.80	2.000 50.80	4	0.750 19.00	3.500 88.90	1.36
1 1/4	1.660 42.20	5.250 133.3	1.750 44.40	0.750 19.00	1.060 26.90	0.810 20.60	2.500 63.50	2.500 63.50	4	0.750 19.00	3.880 98.50	1.68
1 1/2	1.900 48.30	6.120 155.4	1.980 50.50	0.810 20.60	1.190 30.20	0.880 22.30	2.750 69.85	2.880 73.15	4	0.880 22.30	4.500 114.3	2.49
2	2.375 60.30	6.500 165.1	2.500 63.50	0.880 22.30	1.310 33.20	1.120 28.40	3.310 84.00	3.620 91.90	8	0.750 19.00	5.000 127.0	2.87
2 1/2	2.875 73.00	7.500 190.5	3.000 76.20	1.000 25.40	1.500 38.10	1.250 31.70	3.940 100.0	4.120 104.6	8	0.880 22.30	5.880 149.3	4.32
3	3.500 88.90	8.250 209.5	3.630 92.20	1.120 28.40	1.690 42.90	1.250 31.70	4.620 117.3	5.000 127.0	8	0.880 22.30	6.620 168.1	5.85
3 1/2	4.000 101.6	9.000 228.6	4.130 104.9	1.190 30.20	1.750 44.40	1.440 36.50	5.250 133.3	5.500 139.7	8	0.880 22.30	7.250 184.1	7.34
4	4.500 114.3	10.00 254.0	4.630 117.6	1.250 31.70	1.880 47.70	1.440 36.50	5.750 146.0	6.190 157.2	8	0.880 22.30	7.880 200.1	9.61
5	5.563 141.3	11.00 279.4	5.690 144.5	1.380 35.00	2.000 50.80	1.690 42.90	7.000 177.8	7.310 185.7	8	0.880 22.30	9.250 234.9	12.3
6	6.625 168.3	12.50 317.5	6.750 171.4	1.440 36.50	2.060 52.30	1.810 45.90	8.120 206.2	8.500 215.9	12	0.880 22.30	10.62 269.7	15.6
8	8.625 219.1	15.00 381.0	8.750 222.2	1.620 41.10	2.440 61.90	2.000 50.80	10.25 260.3	10.62 269.7	12	1.000 25.40	13.00 330.2	24.2
10	10.75 273.0	17.50 444.5	10.88 276.3	1.880 47.70	2.620 66.55	2.190 55.60	12.62 320.5	12.75 323.9	16	1.120 28.40	15.25 387.3	34.1
12	12.75 323.8	20.50 520.7	12.94 328.7	2.000 50.80	2.880 73.15	2.380 60.45	14.75 374.6	15.00 381.0	16	1.250 31.70	17.75 450.8	49.8
14	14.00 355.6	23.00 584.2	14.19 360.4	2.120 53.80	3.000 76.20	2.500 63.50	16.75 425.4	16.25 412.7	20	1.250 31.70	20.25 514.3	69.9
16	16.00 406.4	25.50 647.7	16.19 411.2	2.250 57.15	3.250 82.50	2.690 68.30	19.00 482.6	18.50 469.9	20	1.380 35.00	22.50 571.5	88.1
18	18.00 457.2	28.00 711.2	18.19 462.0	2.380 60.45	3.500 88.90	2.750 69.85	21.00 533.4	21.00 533.4	24	1.380 35.00	24.75 628.6	109
20	20.00 508.0	30.50 774.7	20.19 512.8	2.500 63.50	3.750 95.2	2.880 73.15	23.12 587.2	23.00 584.2	24	1.380 35.00	27.00 685.8	134
24	24.00 609.6	36.00 914.4	24.19 614.4	2.750 69.85	4.190 106.4	3.250 82.50	27.62 701.5	27.25 692.2	24	1.620 41.10	32.00 812.8	201

Class 400 lb

Pipe		Flange Data					Hub	Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Counterbore min	Flange Thickness min	Overall Length	Threaded length min	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	0.930 23.60	0.560 14.20	0.880 22.40	0.620 15.70	1.500 38.10	1.380 35.10	4	0.620 15.70	2.620 66.55	0.74
3/4	1.050 26.70	4.620 117.3	1.140 29.00	0.620 15.70	1.000 25.40	0.620 15.70	1.880 47.80	1.690 42.90	4	0.750 19.10	3.250 82.60	1.27
1	1.315 33.40	4.880 124.0	1.410 35.80	0.690 17.50	1.060 26.90	0.690 17.50	2.120 53.80	2.000 50.80	4	0.750 19.10	3.500 88.90	1.52
1 1/4	1.660 42.20	5.250 133.4	1.750 44.50	0.810 20.60	1.120 28.40	0.810 20.60	2.500 63.50	2.500 63.50	4	0.750 19.10	3.880 98.60	2.03
1 1/2	1.900 48.30	6.120 155.4	1.990 50.50	0.880 22.40	1.250 31.75	0.880 22.40	2.750 69.85	2.880 73.15	4	0.880 22.40	4.500 114.3	2.96
2	2.375 60.30	6.500 165.1	2.500 63.50	1.000 25.40	1.440 36.60	1.120 28.40	3.310 84.10	3.620 91.90	8	0.750 19.10	5.000 127.0	3.62
2 1/2	2.875 73.00	7.500 190.5	3.000 76.20	1.120 28.40	1.620 41.10	1.250 31.75	3.940 100.1	4.120 104.6	8	0.880 22.40	5.880 149.4	5.28
3	3.500 88.90	8.250 209.6	3.630 92.20	1.250 31.75	1.810 46.00	1.380 35.10	4.620 117.3	5.000 127.0	8	0.880 22.40	6.620 168.1	7
3 1/2	4.000 101.6	9.000 228.6	413.0 104.9	1.380 35.10	1.940 49.30	1.560 39.60	5.250 133.4	5.500 139.7	8	1.000 25.40	7.250 184.2	8.84
4	4.500 114.3	10.00 254.0	4.630 117.6	1.380 35.10	2.000 50.80	1.440 36.60	5.750 146.1	6.190 157.2	8	1.000 25.40	7.880 200.2	11.1
5	5.563 141.3	11.00 279.4	5.690 144.5	1.500 38.10	2.120 53.80	1.690 42.90	7.000 177.8	7.310 185.7	8	1.000 25.40	9.250 235.0	13.9
6	6.625 168.3	12.50 317.5	6.750 171.5	1.620 41.10	2.250 57.15	1.810 46.00	8.120 206.2	8.500 215.9	12	1.000 25.40	10.62 269.7	18.3
8	8.625 219.1	15.00 381.0	8.750 222.3	1.880 47.80	2.690 68.30	2.000 50.80	10.25 260.4	10.62 269.7	12	1.120 28.40	13.00 330.2	28.6
10	10.75 273.0	17.50 444.5	10.88 276.4	2.120 53.80	2.880 73.15	2.190 55.60	12.62 320.5	12.75 323.9	16	1.250 31.75	15.25 387.4	39.2
12	12.75 323.8	20.50 520.7	12.94 328.7	2.250 57.15	3.120 79.25	2.380 60.45	14.75 374.7	15.00 381.0	16	1.380 35.10	17.75 450.9	57
14	14.00 355.6	23.00 584.2	14.19 360.4	2.380 60.45	3.310 84.10	2.500 63.50	16.75 425.5	16.25 412.8	20	1.380 35.10	20.25 514.4	79.1
16	16.00 406.4	25.50 647.7	16.19 411.2	2.500 63.50	3.690 93.70	2.690 68.30	19.00 482.6	18.50 469.9	20	1.500 38.10	22.50 571.5	101
18	18.00 457.2	28.00 711.2	18.19 462.0	2.620 66.55	3.880 98.60	2.750 69.85	21.00 533.4	21.00 533.4	24	1.500 38.10	24.75 628.7	123
20	20.00 508.0	30.50 774.7	20.19 512.8	2.750 69.85	4.000 101.6	2.880 73.15	23.12 587.2	23.00 584.2	24	1.620 41.10	27.00 685.8	146
24	24.00 609.6	36.00 914.4	24.19 614.4	3.000 76.20	4.500 114.3	3.250 82.60	27.62 701.5	27.25 692.2	24	1.880 47.80	32.00 812.8	219

Class 600 lb

Pipe		Flange Data					Hub	Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Counterbore min	Flange Thickness min	Overall Length	Threaded length min	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	0.930 23.60	0.560 14.20	0.880 22.40	0.620 15.70	1.500 38.10	1.380 35.10	4	0.620 15.70	2.620 66.55	0.74
3/4	1.050 26.70	4.620 117.3	1.140 29.00	0.620 15.70	1.000 25.40	0.620 15.70	1.880 47.80	1.690 42.90	4	0.750 19.10	3.250 82.60	1.27
1	1.315 33.40	4.880 124.0	1.410 35.80	0.690 17.50	1.060 26.90	0.690 17.50	2.120 53.80	2.000 50.80	4	0.750 19.10	3.500 88.90	1.52
1 1/4	1.660 42.20	5.250 133.4	1.750 44.50	0.810 20.60	1.120 28.40	0.810 20.60	2.500 63.50	2.500 63.50	4	0.750 19.10	3.880 98.60	2.03
1 1/2	1.900 48.30	6.120 155.4	1.990 50.50	0.880 22.40	1.250 31.75	0.880 22.40	2.750 69.85	2.880 73.15	4	0.880 22.40	4.500 114.3	2.96
2	2.375 60.30	6.500 165.1	2.500 63.50	1.000 25.40	1.440 36.60	1.120 28.40	3.310 84.10	3.620 91.90	8	0.750 19.10	5.000 127.0	3.62
2 1/2	2.875 73.00	7.500 190.5	3.000 76.20	1.120 28.40	1.620 41.10	1.250 31.75	3.940 100.1	4.120 104.6	8	0.880 22.40	5.880 149.4	5.28
3	3.500 88.90	8.250 209.6	3.630 92.20	1.250 31.75	1.810 46.00	1.380 35.10	4.620 117.3	5.000 127.0	8	0.880 22.40	6.620 168.1	7
3 1/2	4.000 101.6	9.000 228.6	4.130 104.9	1.380 35.10	1.940 49.30	1.560 39.60	5.250 133.4	5.500 139.7	8	1.000 25.40	7.250 184.2	8.84
4	4.500 114.3	10.75 273.1	4.630 117.6	1.500 38.10	2.120 53.80	1.620 41.10	6.000 152.4	6.190 157.2	8	1.000 25.40	8.500 215.9	14.5
5	5.563 141.3	13.00 330.2	5.690 144.5	1.750 44.50	2.380 60.45	1.880 47.80	7.440 189.0	7.310 185.7	8	1.120 28.40	10.50 266.7	24.4
6	6.625 168.3	14.00 355.6	6.750 171.5	1.880 47.80	2.620 66.55	2.000 50.80	8.750 222.3	8.500 215.9	12	1.120 28.40	292.1 11.50	28.7
8	8.625 219.1	16.50 419.1	8.750 222.3	2.190 55.60	3.000 76.20	2.250 57.15	10.75 273.1	10.62 269.7	12	1.250 31.75	13.75 349.3	43.4
10	10.75 273.0	20.00 508.0	10.88 276.4	2.500 63.50	3.380 85.90	2.560 65.00	13.50 342.9	12.75 323.9	16	1.380 35.10	17.00 431.8	70.3
12	12.75 323.8	22.00 558.8	12.94 328.7	2.620 66.55	3.620 91.90	2.750 69.85	15.75 400.1	15.00 381.0	20	1.380 35.10	19.25 489.0	84.2
14	14.00 355.6	23.75 603.3	14.19 360.4	2.750 69.85	3.690 93.70	2.880 73.15	17.00 431.8	16.25 412.8	20	1.500 38.10	20.75 527.1	98.7
16	16.00 406.4	27.00 685.8	16.19 411.2	3.000 76.20	4.190 106.4	3.060 77.70	19.50 495.3	18.50 469.9	20	1.620 41.10	23.75 603.3	142
18	18.00 457.2	29.25 743.0	18.19 462.0	3.250 82.60	4.620 117.3	3.120 79.25	21.50 546.1	21.00 533.4	20	1.750 44.50	25.75 654.1	173
20	20.00 508.0	32.00 812.8	20.19 512.8	3.500 88.90	5.000 127.0	3.250 82.60	24.00 609.6	23.00 584.2	24	1.750 44.50	28.50 723.9	220
24	24.00 609.6	37.00 939.8	24.19 614.4	4.000 101.6	5.500 139.7	3.620 91.90	28.25 717.6	27.25 692.2	24	2.000 50.80	33.00 838.2	312

Class 900 lb

Pipe		Flange Data					Hub	Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Counterbore min	Flange Thickness min	Overall Length	Threaded length min	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	0.930 23.60	0.880 22.30	1.250 31.70	0.880 22.30	1.500 38.10	1.380 35.10	4	0.880 22.30	3.250 82.50	1.74
3/4	1.050 26.70	5.120 130.0	1.140 29.00	1.000 25.40	1.380 35.00	1.000 25.40	1.750 44.40	1.690 42.90	4	0.880 22.30	3.500 88.90	2.34
1	1.315 33.40	5.880 149.3	1.410 35.80	1.120 28.40	1.620 41.10	1.120 28.40	2.060 52.30	2.000 50.80	4	1.000 25.40	4.000 101.6	3.44
1 1/4	1.660 42.20	6.250 158.7	1.750 44.40	1.120 28.40	1.620 41.10	1.190 30.20	2.500 63.50	2.500 63.50	4	1.000 25.40	4.380 111.2	3.91
1 1/2	1.900 48.30	7.000 177.8	1.990 50.50	1.250 31.70	1.750 44.50	1.250 31.70	2.750 69.85	2.880 73.15	4	1.120 28.40	4.880 123.9	5.36
2	2.375 60.30	8.500 215.9	2.500 63.50	1.500 38.10	2.250 57.15	1.500 38.10	4.120 104.6	3.620 91.90	8	1.000 25.40	6.500 165.1	9.85
2 1/2	2.875 73.00	9.620 244.3	3.000 76.20	1.620 41.10	2.500 63.50	1.880 47.70	4.880 123.9	4.120 104.6	8	1.120 28.40	7.500 190.5	13.7
3	3.500 88.90	9.500 241.3	3.630 92.20	1.500 38.10	2.120 53.80	1.620 41.10	5.000 127.0	5.000 127.0	8	1.000 25.40	7.500 190.5	11.6
4	4.500 114.3	11.50 292.1	4.630 117.6	1.750 44.40	2.750 69.85	1.880 47.80	6.250 158.7	6.190 157.2	8	1.250 31.70	9.250 234.9	19.7
5	5.563 141.3	13.75 349.2	5.690 144.5	2.000 50.80	3.120 79.25	2.120 53.80	7.500 190.5	7.310 185.7	8	1.380 35.00	279.4 11.00	31.9
6	6.625 168.3	15.00 381.0	6.750 171.4	2.190 55.60	3.380 85.80	2.250 57.15	9.250 234.9	8.500 215.9	12	1.250 31.70	12.50 317.5	41.1
8	8.625 219.1	18.50 469.9	8.750 222.2	2.500 63.50	4.000 101.6	2.500 63.50	11.75 298.4	10.62 269.7	12	1.500 38.10	15.50 393.7	70.7
10	10.75 273.0	21.50 546.1	10.88 276.3	2.750 69.85	4.250 107.9	2.810 71.40	14.50 368.3	12.75 323.9	16	1.500 38.10	18.50 469.9	101
12	12.75 323.8	24.00 609.6	12.94 328.7	3.120 79.40	4.620 117.3	3.000 76.20	16.50 419.1	15.00 381.0	20	1.500 38.10	21.00 533.4	133
14	14.00 355.6	25.25 641.3	14.19 360.4	3.380 85.70	5.120 130.0	3.250 82.50	17.75 450.8	16.25 412.7	20	1.620 41.10	22.00 558.8	153
16	16.00 406.4	27.75 704.8	16.19 411.2	3.500 88.90	5.250 133.3	3.380 85.90	20.00 508.0	18.50 469.9	20	1.750 44.40	24.25 618.9	185
18	18.00 457.2	31.00 787.4	18.19 462.0	4.000 101.6	6.000 152.4	3.500 88.90	22.25 565.1	21.00 533.4	20	2.000 50.80	27.00 685.8	258
20	20.00 508.0	33.75 857.2	20.19 512.8	4.250 107.9	6.250 158.7	3.620 91.90	24.50 622.3	23.00 584.2	20	2.120 53.80	29.50 749.3	317
24	24.00 609.6	41.00 1041.4	24.19 614.4	5.500 139.7	8.000 203.2	4.000 101.6	29.50 749.3	27.25 692.2	20	2.620 66.55	35.50 901.7	606

Class 1500 lb

Pipe		Flange Data					Hub	Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Counterbore min	Flange Thickness min	Overall Length	Threaded length min	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	0.930 23.60	0.880 22.30	1.250 31.70	0.880 22.30	1.500 38.10	1.380 35.00	4	0.880 22.30	3.250 82.50	1.74
3/4	1.050 26.70	5.120 130.0	1.140 29.00	1.000 25.40	1.380 35.00	1.000 25.40	1.750 44.40	1.690 42.90	4	0.880 22.30	3.500 88.90	2.34
1	1.315 33.40	5.880 149.3	1.410 35.80	1.120 28.40	1.620 41.10	1.120 28.40	2.060 52.30	2.000 50.80	4	1.000 25.40	4.000 101.6	3.44
1 1/4	1.660 42.20	6.250 158.7	1.750 44.40	1.120 28.40	1.620 41.10	1.190 30.20	2.500 63.50	2.500 63.50	4	1.000 25.40	4.380 111.2	3.91
1 1/2	1.900 48.30	7.000 177.8	1.990 50.50	1.250 31.70	1.750 44.50	1.250 31.70	2.750 69.85	2.880 73.15	4	1.120 28.40	4.880 123.9	5.36
2	2.375 60.30	8.500 215.9	2.500 63.50	1.500 38.10	2.250 57.15	1.500 38.10	4.120 104.6	3.620 91.90	8	1.000 25.40	6.500 165.1	9.85
2 1/2	2.875 73.00	9.620 244.3	3.000 76.20	1.620 41.10	2.500 63.50	1.880 47.70	4.880 123.9	4.120 104.6	8	1.120 28.40	7.500 190.5	13.7

Class 2500 lb

Pipe		Flange Data					Hub	Raised Face	Drilling Data			Unit Weight
Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
	Outside Diameter	Overall Diameter	Counterbore min	Flange Thickness min	Overall Length	Threaded length min	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	0.930 23.60	1.190 30.20	1.560 39.60	1.120 28.40	1.690 42.90	1.380 35.10	4	0.880 22.40	3.500 88.90	2.95
3/4	1.050 26.70	5.500 139.7	1.140 29.00	1.250 31.75	1.690 42.90	1.250 31.75	2.000 50.80	1.690 42.90	4	0.880 22.40	3.750 95.30	3.44
1	1.315 33.40	6.250 158.8	1.410 35.80	1.380 35.10	1.880 47.80	1.380 35.10	2.250 57.15	2.000 50.80	4	1.000 25.40	4.250 108.0	4.82
1 1/4	1.660 42.20	7.250 1.842	1.750 44.50	1.500 38.10	2.060 52.30	1.500 38.10	2.880 73.15	2.500 63.50	4	1.120 28.40	5.120 130.0	7.14
1 1/2	1.900 48.30	8.000 203.2	1.990 50.50	1.750 44.50	2.380 60.45	1.750 44.50	3.120 79.25	2.880 73.15	4	1.250 31.75	5.750 146.1	10
2	2.375 60.30	9.250 235.0	2.500 63.50	2.000 50.80	2.750 69.85	2.000 50.80	3.750 95.30	3.620 91.90	8	1.120 28.40	6.750 171.5	14.8
2 1/2	2.875 73.00	10.50 266.7	3.000 76.20	2.250 57.15	3.120 79.25	2.250 57.15	4.500 114.3	4.120 104.6	8	1.250 31.75	7.750 196.9	21.5

Notes
- The thread conforms to ASME B1.20.1 NTP threads as described in Section 10. (The only exceptions are small male and female plain face threaded flanges which use NPSL recount threads.)
- Class 150 threaded flanges are made without a counterbore. Threads are chamfered to the major diameter (approx.) at an angle of 45° (approx.) at the back of the flange.
- Weights are based on manufacturer’s data and are approximate. Previous:Threaded Flange
Next:Plate Flange

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