ASME B16.5 Class 400 Blind Flange

Technical Drawing

Dimensions of 400# Blind Flanges

NPS	D	G	K	T
1/2	95	34.9	66.7	14.3
3/4	115	42.9	82.6	15.9
1	125	50.8	88.9	17.5
1-1/4	135	63.5	98.4	20.7
1-1/2	155	73.0	114.3	22.3
2	165	92.1	127.0	25.4
2-1/2	190	104.8	149.2	28.6
3	210	127.0	168.3	31.8
3-1/2	230	139.7	184.2	35.0
4	255	157.2	200.0	35.0
5	280	185.7	235.0	38.1
6	320	215.9	269.9	41.3
8	380	269.9	330.0	47.7
10	445	323.8	387.4	54.0
12	520	381.0	450.8	57.2
14	585	412.8	514.4	60.4
16	650	469.9	571.5	63.5
18	710	533.4	628.6	66.7
20	775	584.2	685.8	69.9
22	840	641.4	743.0	73.1
24	915	692.2	812.8	76.2

*D: outside diameter of blind flange; K: diameter of bolt circle; G: outside diameter of raised face; T: minimum thickness of 400LB blind flange; All units are mm.

NPS	n	d	l	L	Mass
1/2	4	5/8	1/2	75	0.76
3/4	4	3/4	5/8	90	1.28
1	4	3/4	5/8	90	1.60
1-1/4	4	3/4	5/8	95	2.23
1-1/2	4	7/8	3/4	110	3.25
2	8	3/4	5/8	110	4.15
2-1/2	8	7/8	3/4	120	6.13
3	8	7/8	3/4	125	8.44
3-1/2	8	1	7/8	140	11.0
4	8	1	7/8	140	13.7
5	8	1	7/8	145	18.5
6	12	1	7/8	150	25.5
8	12	1-1/8	1	170	42.6
10	16	1-1/4	1-1/8	190	64.5
12	16	1-3/8	1-1/4	205	94.3
14	20	1-3/8	1-1/4	210	124
16	20	1-1/2	1-3/8	220	162
18	24	1-1/2	1-3/8	230	205
20	24	1-5/8	1-1/2	240	254
22	24	1-3/4	1-5/8	255	…
24	24	1-7/8	1-3/4	265	386

*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 400, t (height of raused face)=7mm. 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.