ASME B16.5 Class 900 Lap Joint Flange

Technical Drawing

Dimensions of 900# Lap Joint Flanges

NPS	D	B	X	K
1/2	120	22.9	38	82.6
3/4	130	28.2	44	88.9
1	150	34.9	52	101.6
1-1/4	160	43.7	64	111.1
1-1/2	180	50.0	70	123.8
2	215	62.5	105	165.1
2-1/2	245	75.4	124	190.5
3	240	91.4	127	190.5
4	290	116.8	159	235.0
5	350	144.4	190	279.4
6	380	171.4	235	317.5
8	470	222.2	298	393.7
10	545	277.4	368	469.9
12	610	328.2	419	533.4
14	640	360.2	451	558.8
16	705	411.2	508	616.0
18	785	462.3	565	685.8
20	855	512.8	622	749.3
24	1040	614.4	749	901.7

*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	7/8	3/4	-
3/4	4	7/8	3/4	-
1	4	1	7/8	-
1-1/4	4	1	7/8	-
1-1/2	4	1-1/8	1	-
2	8	1	7/8	-
2-1/2	8	1-1/8	1	-
3	8	1	7/8	-
4	8	1-1/4	1-1/8	-
5	8	1-3/8	1-1/4	-
6	12	1-1/4	1-1/8	-
8	12	1-1/2	1-3/8	-
10	16	1-1/2	1-3/8	-
12	20	1-1/2	1-3/8	-
14	20	1-5/8	1-1/2	-
16	20	1-3/4	1-5/8	-
18	20	2	1-7/8	-
20	20	2-1/8	2	-
24	20	2-5/8	2-1/2	-

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

NPS	Y	T	r	Weight
1/2	32	22.3	3	1.71
3/4	35	25.4	3	2.30
1	41	28.6	3	3.40
1-1/4	41	28.6	5	3.85
1-1/2	44	31.8	6	5.28
2	57	38.1	8	9.78
2-1/2	64	41.3	8	13.6
3	54	38.1	10	11.3
4	70	44.5	11	19.2
5	79	50.8	11	31.2
6	86	55.6	13	40.5
8	114	63.5	13	71.5
10	127	69.9	13	104
12	143	79.4	13	139
14	156	85.8	13	161
16	165	88.9	13	194
18	190	101.6	13	267
20	210	108.0	13	334
24	267	139.7	13	618

* Y: length through hub;  T: minimum thickness of 900LB 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.