ASME B16.5 Class 900 Blind Flange

Technical Drawing

Dimensions of 900# Blind Flanges

NPS	D	G	K	T
1/2	120	34.9	82.6	22.3
3/4	130	42.9	88.9	25.4
1	150	50.8	101.6	28.6
1-1/4	160	63.5	111.1	28.6
1-1/2	180	73.0	123.8	31.8
2	215	92.1	165.1	38.1
2-1/2	245	104.8	190.5	41.3
3	240	127.0	190.5	38.1
4	290	157.2	235.0	44.5
5	350	185.7	279.4	50.8
6	380	215.9	317.5	55.6
8	470	269.9	393.7	63.5
10	545	323.8	469.9	69.9
12	610	381.0	533.4	79.4
14	640	412.8	558.8	85.8
16	705	469.9	616.0	88.9
18	785	533.4	685.8	101.6
20	855	584.2	749.3	108.0
24	1040	692.2	901.7	139.7

*D: outside diameter of blind flange; K: diameter of bolt circle; G: outside diameter of raised face; T: minimum thickness of 900LB blind flange; All units are mm.

NPS	n	d	l	L	Mass
1/2	4	7/8	3/4	110	1.77
3/4	4	7/8	3/4	115	2.42
1	4	1	7/8	125	3.57
1-1/4	4	1	7/8	125	4.14
1-1/2	4	1-1/8	1	140	5.75
2	8	1	7/8	145	10.1
2-1/2	8	1-1/8	1	160	14.0
3	8	1	7/8	145	13.1
4	8	1-1/4	1-1/8	170	26.9
5	8	1-3/8	1-1/4	190	36.5
6	12	1-1/4	1-1/8	190	47.4
8	12	1-1/2	1-3/8	220	82.5
10	16	1-1/2	1-3/8	235	122
12	20	1-1/2	1-3/8	255	173
14	20	1-5/8	1-1/2	275	206
16	20	1-3/4	1-5/8	285	259
18	20	2	1-7/8	325	367
20	20	2-1/8	2	350	463
24	20	2-5/8	2-1/2	440	876

*n: number of bolts; d: diameter of bolt holes; l: diameter of bolts; L: length of stud bolt; Mass: approximate weights/masses of the flange; For all blind flanges of class 900, t (height of raised face) = 7 mm. 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.