SW Flange Sizes & Weights (B16.5)

Quick Reference

ASME B16.5 socket weld flange dimensions for Classes 150-1500. Typically limited to NPS 4” or smaller. Single fillet weld on outside; 1.6mm gap per ASME B31.1.

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Need a printable version? Download the ASME B16.5 Flange Dimensions Chart for all flange types and pressure classes.

ASME Socket Weld Flange Dimensions and Weights

The tables below show ASME B16.5 socket weld flange dimensions including: inside diameter (ID), outside diameter (OD), bolt circle, raised face diameter, flange thickness, socket depth, and bolt hole specifications.

Socket Weld Flange Sizes in Inches

Socket Weld Class 150

Socket weld flange dimensions for Class 150 per ASME B16.5 (in inches). Includes OD, ID, bolt circle, raised face dimensions, and bolt hole specifications.

NPS	ID	OD	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	D	ID 2*	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.88″	3.50″	2.38″	1.38″	.063″	1.19″	.38″	0.62″	.62″	.38″	.56″	.62″	4
3/4″	1.09″	3.88″	2.75″	1.69″	.063″	1.50″	.44″	0.82″	.62″	.44″	.56″	.62″	4
1″	1.36″	4.25″	3.12″	2.00″	.063″	1.94″	.50″	1.05″	.69″	.50″	.63″	.62″	4
1-1/4″	1.70″	4.62″	3.50″	2.50″	.063″	2.31″	.56″	1.38″	.81″	.56″	.75″	.62″	4
1-1/2″	1.97″	5.00″	3.88″	2.88″	.063″	2.56″	.62″	1.61″	.88″	.62″	.82″	.62″	4
2″	2.44″	6.00″	4.75″	3.62″	.063″	3.06″	.69″	2.07″	1.00″	.69″	.94″	.75″	4
2-1/2″	2.94″	7.00″	5.50″	4.12″	.063″	3.56″	.75″	2.47″	1.12″	.82″	1.06″	.75″	4
3″	3.57″	7.50″	6.00″	5.00″	.063″	4.25″	.81″	3.07″	1.19″	.88″	1.13″	.75″	4
3-1/2″	4.07″	8.50″	7.00″	5.50″	.063″	4.81″	.88″	3.55″	1.25″	.88″	1.19″	.75″	8
4″	4.57″	9.00″	7.50″	6.19″	.063″	5.31″	.94″	4.03″	1.31″	.88″	1.25″	.75″	8
5″	5.66″	10.00″	8.50″	7.31″	.063″	6.44″	.94″	5.05″	1.44″	.88″	1.38″	.88″	8
6″	6.72″	11.00″	9.50″	8.50″	.063″	7.56″	1.06″	6.07″	1.56″	.94″	1.50″	.88″	8
8″	8.72″	13.50″	11.75″	10.62″	.063″	9.69″	1.25″	7.98″	1.75″	1.06″	1.69″	.88″	8
10″	10.88″	16.00″	14.25″	12.75″	.063″	12.00″	1.31″	10.02″	1.94″	1.13″	1.88″	1.00″	12
12″	12.88″	19.00″	17.00″	15.00″	.063″	14.38″	1.56″	12.00″	2.19″	1.19″	2.13″	1.00″	12
14″	14.14″	21.00″	18.75″	16.25″	.063″	15.75″	1.63″	13.25″	2.25″	1.32″	2.19″	1.12″	12
16″	16.16″	23.50″	21.25″	18.50″	.063″	18.00″	1.75″	15.25″	2.50″	1.38″	2.44″	1.12″	16
18″	18.18″	25.00″	22.75″	21.00″	.063″	19.88″	1.94″	17.25″	2.69″	1.50″	2.63″	1.25″	16
20″	20.20″	27.50″	25.00″	23.00″	.063″	22.00″	2.13″	19.25″	2.88″	1.63″	2.83″	1.25″	20
22″	22.22″	29.50″	27.25″	25.25″	.063″	24.25″	2.38″	21.25″	3.13″	1.75″	3.07″	1.38″	20
24″	24.25″	32.00″	29.50″	27.25″	.063″	26.12″	2.50″	23.25″	3.25″	1.82″	3.19″	1.38″	20

Socket Weld Class 300

Dimensions of socket weld flange class 300 (in inches)

FLANGENPS	InsideDiameter	OutsideDiameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	D	ID 2*	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.88″	3.75″	2.62″	1.38″	.063″	1.50″	.38″	0.62″	0.88″	0.50″	0.82″	0.62″	4
3/4″	1.09″	4.62″	3.25″	1.69″	.063″	1.88″	.44″	0.82″	1.00″	.056″	0.94″	0.75″	4
1″	1.36″	4.88″	3.50″	2.00″	.063″	2.12″	.50″	1.05″	1.06″	0.63″	1.00″	0.75″	4
1-1/4″	1.70″	5.25″	3.88″	2.50″	.063″	2.50″	.56″	1.38″	1.06″	0.69″	1.00″	0.75″	4
1-1/2″	1.97″	6.12″	4.50″	2.88″	.063″	2.75″	.62″	1.61″	1.19″	0.75″	1.13″	0.88″	4
2″	2.44″	6.50″	5.00″	3.62″	.063″	3.31″	.69″	2.07″	1.31″	0.82″	1.25″	0.75″	8
2-1/2″	2.94″	7.50″	5.88″	4.12″	.063″	3.94″	.75″	2.47″	1.50″	0.94″	1.44″	0.88″	8
3″	3.57″	8.25″	6.62″	5.00″	.063″	4.62″	.81″	3.07″	1.69″	1.06″	1.63″	0.88″	8

Socket Weld Class 600

Dimensions of socket weld flanges class 600 (in inches)

FLANGENPS	ID	OD	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	D	ID 2*	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.88″	3.75″	2.62″	1.38″	.250″	1.50″	.38″	0.55″	1.13″	0.56″	0.88″	0.62″	4
3/4″	1.09″	4.62″	3.25″	1.69″	.250″	1.88″	.44″	0.74″	1.25″	0.62″	1.00″	0.75″	4
1″	1.36″	4.88″	3.50″	2.00″	.250″	2.12″	.50″	0.96″	1.31″	0.69″	1.06″	0.75″	4
1-1/4″	1.70″	5.25″	3.88″	2.50″	.250″	2.50″	.56″	1.28″	1.37″	0.81″	1.12″	0.75″	4
1-1/2″	1.97″	6.12″	4.50″	2.88″	.250″	2.75″	.62″	1.50″	1.50″	0.88″	1.25″	0.88″	4
2″	2.44″	6.50″	5.00″	3.62″	.250″	3.31″	.69″	1.94″	1.69″	1.00″	1.44″	0.75″	8
2-1/2″	2.94″	7.50″	5.88″	4.12″	.250″	3.94″	.75″	2.32″	1.87″	1.12″	1.62″	0.88″	8
3″	3.57″	8.25″	6.62″	5.00″	.250″	4.62″	.81″	2.90″	2.06″	1.25″	1.81″	0.88″	8

Socket Weld Class 1500

Dimensions of socket weld flange class 1500 (in inches)

FLANGENPS	InsideDiameter	OutsideDiameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	D	ID 2*	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.88″	4.75″	3.25″	1.38″	.250″	1.50″	.38″	0.55″	1.50″	0.88″	1.25″	0.88″	4
3/4″	1.09″	5.13″	3.50″	1.69″	.250″	1.75″	.44″	0.74″	1.63″	1.00″	1.38″	0.88″	4
1″	1.36″	5.88″	4.00″	2.00″	.250″	2.06″	.50″	0.96″	1.88″	1.13″	1.63″	1.00″	4
1-1/4″	1.70″	6.25″	4.38″	2.50″	.250″	2.50″	.56″	1.28″	1.88″	1.13″	1.63″	1.00″	4
1-1/2″	1.97″	7.00″	4.88″	2.88″	.250″	2.75″	.62″	1.50″	2.00″	1.25″	1.75″	1.13″	4
2″	2.44″	8.50″	6.50″	3.63″	.250″	4.13″	.69″	1.94″	2.50″	1.50″	2.25″	1.00″	8
2-1/2″	2.94″	9.63″	7.50″	4.13″	.250″	4.88″	.75″	2.32″	2.75″	1.63″	2.50″	1.13″	8

Socket Weld Flange Sizes in Millimeters

Socket Weld Class 150

Socket weld flange dimensions class 150 in millimeters (ASME B16.5)

Sizeinch	Dmm	Xmm	Gmm	tmm	B1mm	B2mm	T2mm	Ymm
1/2	89	30.2	35.1	11.2	15.7	22.4	15.7	9.7
3/4	99	38.1	42.9	12.7	20.8	27.7	15.7	11.2
1	108	49.3	50.8	14.2	26.7	34.5	17.5	12.7
1¼	117	58.7	63.5	15.7	35.1	43.2	20.6	14.2
1½	127	65.0	73.2	17.5	40.9	49.5	22.4	15.7
2	152	77.7	91.9	19.1	52.6	62.0	25.4	17.5
2½	178	90.4	104.6	22.4	62.7	74.7	28.4	19.1
3	191	108.0	127.0	23.9	78.0	90.7	30.2	20.6
3½	216	122.2	139.7	23.9	90.2	103.4	31.8	22.4
4	229	134.9	157.2	23.9	102.4	116.1	33.3	23.9
5	254	163.6	185.7	23.9	128.3	143.8	36.6	23.9
6	279	192.0	215.9	25.4	154.2	170.7	39.6	26.9
8	343	246.1	269.7	28.4	202.7	221.5	44.5	31.8
10	406	304.8	323.9	30.2	254.5	276.4	49.3	33.3
12	483	365.3	381.0	31.8	304.8	327.2	55.6	39.6
14	533	400.1	412.8	35.1	336.6	359.2	57.2	41.4
16	597	457.2	469.9	36.6	387.4	410.5	63.5	44.5
18	635	505.0	533.4	39.6	438.2	461.8	68.3	49.3
20	699	558.8	584.2	42.9	489.0	513.1	73.2	54.1
24	813	663.4	692.2	47.8	590.6	616.0	82.6	63.5

| Size | Drilling | Bolting | | ---- | ---------------------- | ------- | ------------- | --------------- | --------------- | --------------- | ---------------- | | inch | Bolt circleDiameter mm | Holes # | Holes Dia. mm | Bolt Dia. inch. | LengthFF Flange | LengthRF Flange | LengthRTJ Flange | | 1/2 | 60.5 | 4 | 15.7 | 1/2 | 50.8 | 57.2 | - | | 3/4 | 69.9 | 4 | 15.7 | 1/2 | 50.8 | 63.5 | - | | 1 | 79.2 | 4 | 15.7 | 1/2 | 57.2 | 63.5 | 76.2 | | 1¼ | 88.9 | 4 | 15.7 | 1/2 | 57.2 | 69.9 | 82.6 | | 1½ | 98.6 | 4 | 15.7 | 1/2 | 63.5 | 69.9 | 82.6 | | 2 | 120.7 | 4 | 19.1 | 5/8 | 69.9 | 82.6 | 95.3 | | 2½ | 139.7 | 4 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 | | 3 | 152.4 | 4 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 | | 3½ | 177.8 | 8 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 | | 4 | 190.5 | 8 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 | | 5 | 215.9 | 8 | 22.4 | 3/4 | 82.6 | 95.3 | 108.0 | | 6 | 241.3 | 8 | 22.4 | 3/4 | 82.6 | 101.6 | 114.3 | | 8 | 298.5 | 8 | 22.4 | 3/4 | 88.9 | 108.0 | 120.7 | | 10 | 362.0 | 12 | 25.4 | 7/8 | 101.6 | 114.3 | 127.0 | | 12 | 431.8 | 12 | 25.4 | 7/8 | 101.6 | 120.7 | 133.4 | | 14 | 476.3 | 12 | 28.4 | 1 | 114.3 | 133.4 | 146.1 | | 16 | 539.8 | 16 | 28.4 | 1 | 114.3 | 133.4 | 146.1 | | 18 | 577.9 | 16 | 31.8 | 11/8 | 127.0 | 146.1 | 158.8 | | 20 | 635.0 | 20 | 31.8 | 11/8 | 139.7 | 158.8 | 171.5 | | 24 | 749.3 | 20 | 35.1 | 1¼ | 152.4 | 171.5 | 184.2 |

Socket Weld Class 300

Socket weld flange dimensions class 300 in millimeters (ASME B16.5)

Sizeinch	Dmm	Xmm	Gmm	tmm	B1mm	B2mm	T2mm	Ymm
1/2	95	38.1	35.1	14.2	15.7	22.4	22.4	9.7
3/4	117	47.8	42.9	15.7	20.8	27.7	25.4	11.2
1	124	53.8	50.8	17.5	26.7	34.5	26.9	12.7
1¼	133	63.5	63.5	19.1	35.1	43.2	26.9	14.2
1½	155	69.9	73.2	20.6	40.9	49.5	30.2	15.7
2	165	84.1	91.9	22.4	52.6	62.0	33.3	17.5
2½	191	100.1	104.6	25.4	62.7	74.7	38.1	19.1
3	210	117.3	127.0	28.4	78.0	90.7	42.9	20.6
3½	229	133.4	139.7	30.2	90.2	103.4	44.5	22.4
4	254	146.1	157.2	31.8	102.4	116.1	47.8	23.9
5	279	177.8	185.7	35.1	128.3	143.8	50.8	23.9
6	318	206.2	215.9	36.6	154.2	170.7	52.3	26.9
8	381	260.4	269.7	41.1	202.7	221.5	62.0	31.8
10	445	320.5	323.9	47.8	254.5	276.4	66.5	33.3
12	521	374.7	381.0	50.8	304.8	327.2	73.2	39.6
14	584	425.5	412.8	63.8	336.6	359.2	76.2	41.4
16	648	482.6	469.9	57.2	387.4	410.5	82.6	44.5
18	711	533.4	533.4	60.5	438.2	461.8	88.9	49.3
20	775	587.2	584.2	63.5	489.0	513.1	95.3	54.1
24	914	701.5	692.2	69.9	590.6	616.0	106.4	63.5

| Size | Drilling | Bolting | | ---- | ---------------------- | ------- | ------------- | --------------- | --------------- | --------------- | ---------------- | | inch | Bolt circleDiameter mm | Holes # | Holes Dia. mm | Bolt Dia. inch. | LengthFF Flange | LengthRF Flange | LengthRTJ Flange | | 1/2 | 66.5 | 4 | 15.7 | 1/2 | 57.2 | 63.5 | 76.2 | | 3/4 | 82.6 | 4 | 19.1 | 5/8 | 63.5 | 76.2 | 88.9 | | 1 | 88.9 | 4 | 19.1 | 5/8 | 63.5 | 76.2 | 88.9 | | 1¼ | 98.6 | 4 | 19.1 | 5/8 | 69.9 | 82.6 | 95.3 | | 1½ | 114.3 | 4 | 22.4 | 3/4 | 76.2 | 88.9 | 101.6 | | 2 | 127.0 | 8 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 | | 2½ | 149.4 | 8 | 22.4 | 3/4 | 82.6 | 101.6 | 114.3 | | 3 | 168.1 | 8 | 22.4 | 3/4 | 88.9 | 108.0 | 120.7 | | 3½ | 184.2 | 8 | 22.4 | 3/4 | 95.3 | 108.0 | 127.0 | | 4 | 200.2 | 8 | 22.4 | 3/4 | 95.3 | 114.3 | 127.0 | | 5 | 235.0 | 8 | 22.4 | 3/4 | 108.0 | 120.7 | 133.4 | | 6 | 269.7 | 12 | 22.4 | 3/4 | 108.0 | 120.7 | 139.7 | | 8 | 330.2 | 12 | 25.4 | 7/8 | 120.7 | 139.7 | 152.4 | | 10 | 387.4 | 16 | 28.4 | 1 | 139.7 | 158.8 | 171.5 | | 12 | 450.9 | 16 | 31.8 | 11/8 | 146.1 | 171.5 | 184.2 | | 14 | 514.4 | 20 | 31.8 | 11/8 | 158.8 | 177.8 | 190.5 | | 16 | 571.5 | 20 | 35.1 | 1¼ | 165.1 | 190.5 | 203.2 | | 18 | 628.7 | 24 | 35.1 | 1¼ | 171.5 | 196.9 | 209.6 | | 20 | 685.8 | 24 | 35.1 | 1¼ | 184.2 | 203.2 | 222.3 | | 24 | 812.8 | 24 | 41.1 | 1½ | 203.2 | 228.6 | 254.0 |

Socket Weld Class 600

Socket weld flange dimensions class 600 in millimeters (ASME B16.5)

Sizeinch	Dmm	Xmm	Gmm	tmm	B1mm	B2mm	T2mm	Ymm
1/2	95	38.1	35.1	14.2	B36.10/.19	22.4	22.4	9.7
3/4	117	47.8	42.9	15.7	B36.10/.19	27.7	25.4	11.2
1	124	53.8	50.8	17.5	B36.10/.19	34.5	26.9	12.7
1¼	133	63.5	63.5	20.6	B36.10/.19	43.2	28.4	14.2
1½	155	69.9	73.2	22.4	B36.10/.19	49.5	31.8	15.7
2	165	84.1	91.9	25.4	B36.10/.19	62.0	36.6	17.5
2½	191	100.1	104.6	28.4	B36.10/.19	74.7	41.1	19.1
3	210	117.3	127.0	31.8	B36.10/.19	90.7	46.0	20.6
3½	229	133.4	139.7	35.1	B36.10/.19	103.4	49.3	22.4
4	273	152.4	157.2	38.1	B36.10/.19	116.1	53.8	23.9
5	330	189.0	185.7	44.5	B36.10/.19	143.8	60.5	23.9
6	356	222.3	215.9	47.8	B36.10/.19	170.7	66.5	26.9
8	419	273.1	269.7	55.6	B36.10/.19	221.5	76.2	31.8
10	508	342.9	323.9	63.5	B36.10/.19	276.4	85.9	33.3
12	559	400.1	381.0	66.5	B36.10/.19	327.2	91.9	39.6
14	603	431.8	412.8	69.9	B36.10/.19	359.2	93.7	41.4
16	686	495.3	469.9	76.2	B36.10/.19	410.5	106.4	44.5
18	743	546.1	533.4	82.6	B36.10/.19	461.8	117.3	49.3
20	813	609.6	584.2	88.9	B36.10/.19	513.1	127.0	54.1
24	940	717.6	692.2	101.6	B36.10/.19	616.0	139.7	63.5

| Size | Drilling | Bolting | | ---- | ---------------------- | ------- | ------------- | --------------- | --------------- | --------------- | ---------------- | | inch | Bolt circleDiameter mm | Holes # | Holes Dia. mm | Bolt Dia. inch. | LengthFF Flange | LengthRF Flange | LengthRTJ Flange | | 1/2 | 66.5 | 4 | 15.7 | 1/2 | 76.2 | 69.9 | 76.2 | | 3/4 | 82.6 | 4 | 19.1 | 5/8 | 88.9 | 82.6 | 88.9 | | 1 | 88.9 | 4 | 19.1 | 5/8 | 88.9 | 82.6 | 88.9 | | 1¼ | 98.6 | 4 | 19.1 | 5/8 | 95.3 | 88.9 | 95.3 | | 1½ | 114.3 | 4 | 22.4 | 3/4 | 108.0 | 101.6 | 108.0 | | 2 | 127.0 | 8 | 19.1 | 5/8 | 108.0 | 101.6 | 108.0 | | 2½ | 149.4 | 8 | 22.4 | 3/4 | 120.7 | 114.3 | 120.7 | | 3 | 168.1 | 8 | 22.4 | 3/4 | 127.0 | 120.7 | 127.0 | | 3½ | 184.2 | 8 | 25.4 | 7/8 | 139.7 | 133.4 | 139.7 | | 4 | 215.9 | 8 | 25.4 | 7/8 | 146.1 | 139.7 | 146.1 | | 5 | 266.7 | 8 | 28.4 | 1 | 165.1 | 158.8 | 165.1 | | 6 | 292.1 | 12 | 28.4 | 1 | 171.5 | 165.1 | 171.5 | | 8 | 349.3 | 12 | 31.8 | 11/8 | 190.5 | 184.2 | 196.9 | | 10 | 431.8 | 16 | 35.1 | 1¼ | 215.9 | 209.6 | 215.9 | | 12 | 489.0 | 20 | 35.1 | 1¼ | 222.3 | 215.9 | 222.3 | | 14 | 527.1 | 20 | 38.1 | 13/8 | 235.0 | 228.6 | 235.0 | | 16 | 603.3 | 20 | 41.1 | 1½ | 254.0 | 247.7 | 254.0 | | 18 | 654.1 | 20 | 44.5 | 15/8 | 273.1 | 266.7 | 273.1 | | 20 | 723.9 | 24 | 44.5 | 15/8 | 285.8 | 279.4 | 292.1 | | 24 | 838.2 | 24 | 50.8 | 17/8 | 330.2 | 323.9 | 336.6 |

Tolerance of Socket Weld Flanges

ASME B16.5 defines tolerances for socket-weld flanges used in small-size, high-pressure piping. Socket-weld flanges have a recessed area where the pipe is inserted before being fillet-welded around the outer diameter. Below is a summary of general tolerance values per ASME B16.5. For precise values by size and class, refer directly to the standard.

Diameter of Bolt Circle (P):

Tolerance: ±1.6 mm (±1/16 inch) for flanges up to and including NPS 24. This ensures even distribution of bolt loads and proper alignment.

Diameter of Bolt Holes (Q):

Tolerance: Bolt holes are typically oversized by +3 mm (1/8 inch) relative to the bolt diameter, allowing for alignment during assembly.

Flange Thickness (T):

Tolerance: General guideline for flanges up to NPS 24 is ±3 mm (±1/8 inch). This tolerance balances pressure containment strength against weight.

Outside Diameter of Flange (O):

Tolerance: ±1.6 mm (±1/16 inch) for sizes up to NPS 24, ensuring compatibility with mating components and equipment.

Socket Depth (D):

Tolerance: Socket depth tolerances control how far the pipe is inserted before welding, so the pipe reaches the correct depth for a sound fillet weld.

Bore Diameter (B):

Tolerance: The bore diameter tolerance provides slight clearance over the pipe OD, preventing flow restriction while maintaining a gap suitable for welding without excessive clearance or interference.

Counterbore Diameter (G) and Depth:

Tolerance: Specific tolerances apply to the counterbore diameter and depth so that the pipe seats correctly within the flange socket before welding.

Facing Finish:

Tolerance: The flange face surface finish is specified in Ra (Roughness Average) and varies based on facing type and gasket material. The finish must be compatible with the selected gasket to achieve a reliable seal.

Meeting these tolerances is required for proper alignment, weld quality, and sealing performance of socket-weld flange connections. For detailed tolerance values by size and class, refer to the latest edition of ASME B16.5.

SW Flange Weights

SW Flange Weight in Kgs.

The table shows the ASME B16.5 socket-weld (SW) flange weights in Kgs. by Flange NPS and Class (carbon/alloy steel materials; for higher grades, consider adjusting weight using the delta-specific weight carbon/other grades)

NPS	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500
1/2	0.9	1.4	0.9	0.9	2.7	2.7
3/4	0.9	1.4	1.4	1.4	2.7	2.7
1	0.9	1.4	1.6	1.8	3.4	3.6
1¼	1.4	1.8	2	2.3	4.5	4.5
1½	1.4	2.7	2.9	3.2	6.3	6.3
2	2.3	3.2	3.6	4.1	9.9	11.3
2½	3.6	4.5	5.4	5.9	13.9	16.2
3	4.1	5.9	6.8	7.2	16.2	21.6
3½	4	7.7	9.5	9.5
4	5.9	9.9	11.7	16.7	23.9	32.9
5	6.8	12.6	13.9	28.4	37.4	59.4
6	8.6	17.6	19.8	36	49.5	74.3
8	13.5	26.1	30.2	51.8	77.4	117
10	19.4	36.5	40	79.7	110.3	196.2
12	28.8	51.8	58.5	96.8	146.7	300.2
14	40.5	74.3	85	116.6	180	423
16	44.1	85.5	113.9	164.7	206.6	562.5
18	58.5	112.5	139.5	214.2	291.2	731.3
20	74.3	141.8	170.1	275.4	356.4	922.5
22	83.3	166.5	182.3	265.5
24	99	213.8	242.6	394.2	666	1271

SW Flange Weight in Lbs.

The table shows the ASME B16.5 socket-weld (SW) flange weights in Lbs. by Flange NPS and Class (carbon/alloy steel materials; for higher grades, consider adjusting weight using the delta-specific weight carbon/other grades)

CLASS 150	Nominal Pipe Size	Socket Weld Weight in Lbs./unit
	½	2
	¾	2
	1	2
	1¼	3
	1½	3
	2	5
	2½	8
	3	9
	3½	11
	4	13
	5	15
	6	19
	8	30
	10	43
	12	64
	14	90
	16	98
	18	130
	20	165
	22	185
	24	220
CLASS 300	Nominal Pipe Size	Socket Weld Weight in Lbs./unit
	½	3
	¾	3
	1	3
	1¼	4
	1½	6
	2	7
	2½	10
	3	13
	3½	17
	4	22
	5	28
	6	39
	8	58
	10	81
	12	115
	14	165
	16	190
	18	250
	20	315
	22	370
	24	475
CLASS 400	Nominal Pipe Size	Socket Weld Weight in Lbs./unit
	½	2
	¾	3
	1	3.5
	1¼	4.5
	1½	6.5
	2	8
	2½	12
	3	15
	3½	21
	4	26
	5	31
	6	44
	8	67
	10	91
	12	130
	14	191
	16	253
	18	310
	20	378
	22	405
	24	539
CLASS 600	Nominal Pipe Size	Socket Weld Weight in Lbs./unit
	½	2
	¾	3
	1	4
	1¼	5
	1½	7
	2	9
	2½	13
	3	16
	3½	21
	4	37
	5	63
	6	80
	8	115
	10	177
	12	215
	14	259
	16	366
	18	476
	20	612
	22	590
	24	876
CLASS 900	Nominal Pipe Size	Socket Weld Weight in Lbs./unit
	½	6
	¾	6
	1	7.5
	1¼	10
	1½	14
	2	22
	2½	31
	3	36
	4	53
	5	83
	6	110
	8	172
	10	245
	12	326
	14	400
	16	459
	18	647
	20	792
	24	1480
CLASS 1500	Nominal Pipe Size	Socket Weld Weight in Lbs./unit
	½	6
	¾	6
	1	8
	1¼	10
	1½	14
	2	25
	2½	36
	3	48
	4	73
	5	132
	6	165
	8	260
	10	436
	12	667
	14	940
	16	1250
	18	1625
	20	2050
	24	2825