ASME B16.5 Class 150 Blind Flange

Technical Drawing

Dimensions of 150# Blind Flanges

NPS	D	G	K	T
1/2	90	34.9	60.3	9.6
3/4	100	42.9	69.9	11.2
1	110	50.8	79.4	12.7
1-1/4	115	63.5	88.9	14.3
1-1/2	125	73.0	98.4	15.9
2	150	92.1	120.7	17.5
2-1/2	180	104.8	139.7	20.7
3	190	127.0	152.4	22.3
3-1/2	215	139.7	177.8	22.3
4	230	157.2	190.5	22.3
5	255	185.7	215.9	22.3
6	280	215.9	241.3	23.9
8	345	269.9	298.5	27.0
10	405	323.8	362.0	28.6
12	485	381.0	431.8	30.2
14	535	412.8	476.3	33.4
16	595	469.9	539.8	35.0
18	635	533.4	577.9	38.1
20	700	584.2	635.0	41.3
22	750	641.4	692.2	44.5
24	815	692.2	749.3	46.1

*D: outside diameter of blind flange; K: diameter of bolt circle; G: outside diameter of raised face; T: minimum thickness of 150LB blind flange; All units are mm.

NPS	n	d	l	L	Mass
1/2	4	5/8	1/2	55	0.42
3/4	4	5/8	1/2	65	0.61
1	4	5/8	1/2	65	0.86
1-1/4	4	5/8	1/2	70	1.17
1-1/2	4	5/8	1/2	70	1.53
2	4	3/4	5/8	85	2.42
2-1/2	4	3/4	5/8	90	3.94
3	4	3/4	5/8	90	4.93
3-1/2	8	3/4	5/8	90	6.17
4	8	3/4	5/8	90	7.00
5	8	7/8	3/4	95	8.63
6	8	7/8	3/4	100	11.3
8	8	7/8	3/4	110	19.6
10	12	1	7/8	115	28.8
12	12	1	7/8	120	43.2
14	12	1-1/8	1	135	58.1
16	16	1-1/8	1	135	76.0
18	16	1-1/4	1-1/8	145	93.7
20	20	1-1/4	1-1/8	160	122
22	20	1-3/8	1-1/4	170	…
24	20	1-3/8	1-1/4	170	185

*n: number of bolts; d: diameter of bolt holes; l: diameter of bolts; L: length of machine bolt or stud bolt; Mass: approximate weights/masses of the flange; For all blind flanges of class 150, t (height of raused face)=2mm. All units are mm except that d and l are provided in inch and mass in kg.

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

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