ASME B16.11 Cap | SW & Threaded

December 7, 2021

Technical Drawing & Function

The drawing of ASME B16.11 socket welding (SW) cap. B: socket bore diameter; C: socket wall thickness; K: end wall thickness; J: socket depth.

The drawing of ASME B16.11 forged cap with threaded ends. B: minimum length of perfect thread; L₂: effective length of external thread; P: End-to-End caps; G: minimum end wall thickness.

The ASME B16.11 cap, either socket welding or threaded, is used to seal an open end of pipe. SW caps are available in pressure ratings Class 3000, 6000, 9000; threaded caps are available in pressure ratings 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 Cap

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	K 3000# min. mm	K 6000# min. mm	K 9000# min. mm	Mass 3000# kg	Mass 6000# kg
1/8"	4.8	6.4	-	0.03	-
1/4"	4.8	6.4	-	0.06	0.09
3/8"	4.8	6.4	-	0.08	0.16
1/2"	6.4	7.9	11.2	0.12	0.19
3/4"	6.4	7.9	12.7	0.16	0.28
1"	9.6	11.2	14.2	0.25	0.59
1-1/4"	9.6	11.2	14.2	0.43	0.77
1-1/2"	11.2	12.7	15.7	0.55	1.09
2"	12.7	15.7	19.0	0.93	1.55
2-1/2"	15.7	19.0	-	1.43	2.57
3"	19.0	22.4	-	2.31	3.53
4"	22.4	28.4	-	4.20	6.30

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

Dimensions & Masses of ASME B16.11 Threaded Cap

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#
1/8"	16	22
1/4"	19	25
3/8"	22	32
1/2"	28	38
3/4"	35	44
1"	44	57
1-1/4"	57	64
1-1/2"	64	76
2"	76	92
2-1/2"	92	108
3"	108	127
4"	140	159

*D: all dimensions are in mm.

NPS	P 3000#	P 6000#	G 3000#	G 6000#
1/8"	19	22	4.8	6.4
1/4"	25	27	4.8	6.4
3/8"	32	27	4.8	6.4
1/2"	32	33	6.4	7.9
3/4"	37	38	6.4	7.9
1"	41	43	9.7	11.2
1-1/4"	44	46	9.7	11.2
1-1/2"	44	48	11.2	12.7
2"	48	51	12.7	15.7
2-1/2"	60	64	15.7	19.0
3"	65	68	19.0	22.4
4"	68	75	22.4	28.4

*P & G: all dimensions are in mm.

NPS	Mass 3000# kg	Mass 6000# kg
1/8"	0.03	0.05
1/4"	0.04	0.06
3/8"	0.06	0.08
1/2"	0.12	0.15
3/4"	0.16	0.23
1"	0.28	0.49
1-1/4"	0.51	0.68
1-1/2"	0.73	1.02
2"	1.30	1.75
2-1/2"	2.25	2.60
3"	3.33	4.00
4"	6.42	9.00

*Masses of threaded cap Class 3000 & Class 6000.

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