ASME B16.11 Coupling | SW & Threaded

December 1, 2021

Technical Drawing & Pressure Ratings

The drawing of ASME B16.11 forged coupling with two socket welding (SW) ends. B: socket bore diameter; C: socket wall thickness; D: bore diameter of SW coupling; J: socket depth; E: laying length of SW coupling.

The drawing of ASME B16.11 forged coupling with two threaded ends. B: minimum length of perfect thread; L₂: effective length of external thread; D: outside diameter; W: end to end length of threaded coupling.

ASME B16.11 forged coupling, also known as full coupling, is a length of small-bore sleeve with reinforced wall thickness to connect two pipes. The coupling may be furnished with two internally threaded (THD) ends, two socket welding (SW) ends, or a combination of SW and threaded ends. ASME B16.11 SW couplings are available in pressure rating Class 3000, 6000, and 9000; ASME B16.11 threaded couplings are available in pressure rating Class 3000 and 6000.

ASME B16.11 Forged Fittings (SW & THD)
90° Elbow	45° Elbow	Cross
Tee	Coupling	Half Coupling
Boss	Cap	Couplet
Street Elbow*	Plug*	Bushing*

*Click to view dimensions and masses of other ASME B16.11 fittings.

Dimensions & Masses of ASME B16.11 SW Couplings

NPS	B max.	B min.	J min.
1/8"	11.2	10.8	9.5
1/4"	14.6	14.2	9.5
3/8"	18.0	17.6	9.5
1/2"	22.2	21.8	9.5
3/4"	27.6	27.2	12.5
1"	34.3	33.9	12.5
1-1/4"	43.1	42.7	12.5
1-1/2"	49.2	48.8	12.5
2"	61.7	61.2	16.0
2-1/2"	74.4	73.9	16.0
3"	90.3	89.8	16.0
4"	115.7	115.2	19.0

*B & J: all dimensions are in mm.

NPS	3000#		6000#		9000#
NPS	C max.	C min.	C max.	C min.	C max.	C min.
1/8"	3.18	3.18	3.96	3.43	-	-
1/4"	3.78	3.30	4.60	4.01	-	-
3/8"	4.01	3.50	5.03	4.37	-	-
1/2"	4.67	4.09	5.97	5.18	9.35	8.18
3/4"	4.90	4.27	6.96	6.04	9.78	8.56
1"	5.69	4.98	7.92	6.93	11.38	9.96
1-1/4"	6.07	5.28	7.92	6.93	12.14	10.62
1-1/2"	6.35	5.54	8.92	7.80	12.70	11.12
2"	6.93	6.04	10.92	9.50	13.84	12.12
2-1/2"	8.76	7.67	-	-	-	-
3"	9.52	8.30	-	-	-	-
4"	10.69	9.53	-	-	-	-

*C: all dimensions are in mm.

NPS	3000#		6000#		9000#
NPS	D max.	D min.	D max.	D min.	D max.	D min.
1/8"	7.6	6.1	4.8	3.2	-	-
1/4"	10.0	8.5	7.1	5.6	-	-
3/8"	13.3	11.8	9.9	8.4	-	-
1/2"	16.6	15.0	12.5	11.0	7.2	5.6
3/4"	21.7	20.2	16.3	14.8	11.8	10.3
1"	27.4	25.9	21.5	19.9	16.0	14.4
1-1/4"	35.8	34.3	30.2	28.7	23.5	22.2
1-1/2"	41.6	40.1	34.7	33.2	28.7	27.2
2"	53.3	51.7	43.6	42.1	38.9	37.4
2-1/2"	64.2	61.2	-	-	-	-
3"	79.4	76.4	-	-	-	-
4"	103.8	100.7	-	-	-	-

*D: all dimensions are in mm.

NPS	E mm	Mass 3000# kg	Mass 6000# kg
1/8"	6.5	0.06	0.10
1/4"	6.5	0.07	0.11
3/8"	6.5	0.09	0.21
1/2"	9.5	0.14	0.29
3/4"	9.5	0.20	0.40
1"	12.5	0.34	0.72
1-1/4"	12.5	0.49	0.95
1-1/2"	12.5	0.66	1.35
2"	19.0	1.04	2.24
2-1/2"	19.0	1.70	3.13
3"	19.0	2.15	4.20
4"	19.0	3.61	7.50

*E: in mm; Mass (for Class 3000 and 6000): in kg.

Dimensions & Masses of ASME B16.11 Threaded Couplings

NPS	B	L₂
1/8"	6.4	6.7
1/4"	8.1	10.2
3/8"	9.1	10.4
1/2"	10.9	13.6
3/4"	12.7	13.9
1"	14.7	17.3
1-1/4"	17.0	18.0
1-1/2"	17.8	18.4
2"	19.0	19.2
2-1/2"	23.6	28.9
3"	25.9	30.5
4"	27.7	33.0

*B & L₂: all dimensions are in mm.

NPS	D 3000#	D 6000#	W
1/8"	16	22	32
1/4"	19	25	35
3/8"	22	32	48
1/2"	28	38	48
3/4"	35	44	51
1"	44	57	60
1-1/4"	57	64	67
1-1/2"	64	76	79
2"	76	92	86
2-1/2"	92	108	92
3"	108	127	108
4"	140	159	121

*D & W: all dimensions are in mm. Values for W are applicable to both Class 3000 and 6000.

NPS	Mass 3000# kg	Mass 6000# kg
1/8"	0.06	0.10
1/4"	0.07	0.11
3/8"	0.09	0.14
1/2"	0.15	0.29
3/4"	0.22	0.45
1"	0.43	0.96
1-1/4"	0.85	1.30
1-1/2"	1.08	2.00
2"	1.64	3.40
2-1/2"	2.32	5.00
3"	3.60	6.70
4"	6.40	12.50

*Masses of Coupling Class 3000 & Class 6000.

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