ASME B16.5 Class 150 Lap Joint Flange

Technical Drawing

Dimensions of 150# Lap Joint Flanges

NPS	D	B	X	K
1/2	90	22.9	30	60.3
3/4	100	28.2	38	69.9
1	110	34.9	49	79.4
1-1/4	115	43.7	59	88.9
1-1/2	125	50.0	65	98.4
2	150	62.5	78	120.7
2-1/2	180	75.4	90	139.7
3	190	91.4	108	152.4
3-1/2	215	104.1	122	177.8
4	230	116.8	135	190.5
5	255	144.4	164	215.9
6	280	171.4	192	241.3
8	345	222.2	246	298.5
10	405	277.4	305	362.0
12	485	328.2	365	431.8
14	535	360.2	400	476.3
16	595	411.2	457	539.8
18	635	462.3	505	577.9
20	700	514.4	559	635.0
22	750	565.2	610	692.2
24	815	616.0	663	749.3

*D: outside diameter of flange; K: diameter of bolt circle; B: minimum bore diameter; X: diameter of hub at base; All units are mm.

NPS	n	d	l	L
1/2	4	5/8	1/2	-
3/4	4	5/8	1/2	-
1	4	5/8	1/2	-
1-1/4	4	5/8	1/2	-
1-1/2	4	5/8	1/2	-
2	4	3/4	5/8	-
2-1/2	4	3/4	5/8	-
3	4	3/4	5/8	-
3-1/2	8	3/4	5/8	-
4	8	3/4	5/8	-
5	8	7/8	3/4	-
6	8	7/8	3/4	-
8	8	7/8	3/4	-
10	12	1	7/8	-
12	12	1	7/8	-
14	12	1-1/8	1	-
16	16	1-1/8	1	-
18	16	1-1/4	1-1/8	-
20	20	1-1/4	1-1/8	-
22	20	1-3/8	1-1/4	-
24	20	1-3/8	1-1/4	-

*n: number of bolts; d: diameter of bolt holes; l: diameter of bolts; L: length of machine bolt or stud bolt, calculated according to Non-mandatory Appendix C; All units are mm except that d and l are provided in inch.

NPS	r	Y	T	Weight
1/2	3	16	11.2	0.38
3/4	3	16	12.7	0.55
1	3	17	14.3	0.76
1-1/4	5	21	15.9	1.01
1-1/2	6	22	17.5	1.30
2	8	25	19.1	2.03
2-1/2	8	29	22.3	3.25
3	10	30	23.9	3.81
3-1/2	10	32	23.9	4.76
4	11	33	23.9	5.25
5	11	36	23.9	6.02
6	13	40	25.4	7.40
8	13	44	28.6	12.1
10	13	49	30.2	16.4
12	13	56	31.8	26.1
14	13	79	35.0	34.5
16	13	87	36.6	44.6
18	13	97	39.7	48.7
20	13	103	42.9	61.6
22	13	108	46.1	…
24	13	111	47.7	86.6

* Y: length through hub;  T: minimum thickness of 150LB lap joint flange; r: corner bore radius of lapped flange and pipe; Weight: approximate weights/masses of the flange; All units are in mm except that weights are in kg.

ASME B16.5 Lap Joint Flanges, Classes
150#	300#	400#	600#
900#	1500#	2500#	-

*Click to view the dimensions and weights of lap joint flanges of each pressure rating.