ASME B16.11 Boss | SW & Threaded

December 2, 2021

Technical Drawing & Function

The drawing of ASME B16.11 socket welding (SW) boss. B: socket bore diameter; C: socket wall thickness; D: bore diameter of SW boss; J: socket depth; F: laying length of SW boss.

The drawing of ASME B16.11 forged boss with threaded ends. B: minimum length of perfect thread; L₂: effective length of external thread; D: outside diameter; W/2: end to end length of threaded boss.

The ASME B16.11 welding boss, either with socket welding end (Class 3000, 6000, 9000) or threaded end (Class 3000, 6000), is used as a branch connection on pipe header or a nozzle connection on equipment. It resembles the function of a weld outlet. A branch pipe is joined by socket welding or threaded connection of the boss. The boss is then welded onto the external surface of pipe header. Compared to a half coupling, the other end is bevelled at an angle of 45°±2.5° with a root face of 1.6mm±0.76mm. The bevelled end will facilitate the welding process.

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 Boss

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	F mm	Mass 3000# kg	Mass 6000# kg
1/8"	16.0	-	-
1/4"	16.0	0.07	0.14
3/8"	17.5	0.08	0.23
1/2"	22.5	0.17	0.30
3/4"	24.0	0.22	0.52
1"	28.5	0.37	0.92
1-1/4"	30.0	0.53	1.10
1-1/2"	32.0	0.68	1.30
2"	41.0	0.82	2.00
2-1/2"	43.0	-	-
3"	44.5	-	-
4"	48.0	-	-

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

Dimensions & Masses of ASME B16.11 Threaded Boss

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/2
1/8"	16	22	16
1/4"	19	25	17.5
3/8"	22	32	24
1/2"	28	38	24
3/4"	35	44	25.5
1"	44	57	30
1-1/4"	57	64	33.5
1-1/2"	64	76	39.5
2"	76	92	43
2-1/2"	92	108	46
3"	108	127	54
4"	140	159	60.5

*D & W/2: all dimensions are in mm. Values for W/2 are applicable to both Class 3000 and 6000.

NPS	Mass 3000# kg	Mass 6000# kg
1/8"	0.06	-
1/4"	0.07	0.14
3/8"	0.08	0.23
1/2"	0.14	0.33
3/4"	0.20	0.42
1"	0.34	0.61
1-1/4"	0.55	1.10
1-1/2"	0.60	1.20
2"	0.77	1.85
2-1/2"	-	-
3"	-	-
4"	-	-

*Masses of threaded boss Class 3000 & Class 6000.

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