Blind Flange Dimensions (Cl. 150/300/900/1500/2500)

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The charts show the dimensions of blind flange class 150, 300, 400, 900, 1500, 2500 in inches and in millimeters.

BLIND FLANGE DIMENSIONS IN INCHES

Blind flange dimensions class 150 in inches

FLANGE NPS	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	Raised Face Thickness (T)	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	3.50″	2.38″	1.38″	.063″	.44″	.38″	.62″	4
3/4″	3.88″	2.75″	1.69″	.063″	.50″	.44″	.62″	4
1″	4.25″	3.12″	2.00″	.063″	.56″	.50″	.62″	4
1-1/4″	4.62″	3.50″	2.50″	.063″	.62″	.56″	.62″	4
1-1/2″	5.00″	3.88″	2.88″	.063″	.68″	.62″	.62″	4
2″	6.00″	4.75″	3.62″	.063″	.75″	.69″	.75″	4
2-1/2″	7.00″	5.50″	4.12″	.063″	.88″	.82″	.75″	4
3″	7.50″	6.00″	5.00″	.063″	.94″	.88″	.75″	4
3-1/2″	8.50″	7.00″	5.50″	.063″	.94″	.88″	.75″	8
4″	9.00″	7.50″	6.19″	.063″	.94″	.88″	.75″	8
5″	10.00″	8.50″	7.31″	.063″	.94″	.88″	.88″	8
6″	11.00″	9.50″	8.50″	.063″	1.00″	.94″	.88″	8
8″	13.50″	11.75″	10.62″	.063″	1.12″	1.06″	.88″	8
10″	16.00″	14.25″	12.75″	.063″	1.19″	1.13″	1.00″	12
12″	19.00″	17.00″	15.00″	.063″	1.25″	1.19″	1.00″	12
14″	21.00″	18.75″	16.25″	.063″	1.38″	1.32″	1.12″	12
16″	23.50″	21.25″	18.50″	.063″	1.44″	1.38″	1.12″	16
18″	25.00″	22.75″	21.00″	.063″	1.56″	1.50″	1.25″	16
20″	27.50″	25.00″	23.00″	.063″	1.69″	1.63″	1.25″	20
22″	29.50″	27.25″	25.25″	.063″	1.81″	1.75″	1.38″	20
24″	32.00″	29.50″	27.25″	.063″	1.88″	1.82″	1.38″	20

Blind flange dimensions class 300 in inches

FLANGE NPS	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	Raised Face Thickness (T)	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	3.75″	2.62″	1.38″	.063″	0.56″	0.50″	0.62″	4
3/4″	4.62″	3.25″	1.69″	.063″	0.62″	.056″	0.75″	4
1″	4.88″	3.50″	2.00″	.063″	0.69″	0.63″	0.75″	4
1-1/4″	5.25″	3.88″	2.50″	.063″	0.75″	0.69″	0.75″	4
1-1/2″	6.12″	4.50″	2.88″	.063″	0.81″	0.75″	0.88″	4
2″	6.50″	5.00″	3.62″	.063″	0.88″	0.82″	0.75″	8
2-1/2″	7.50″	5.88″	4.12″	.063″	1.00″	0.94″	0.88″	8
3″	8.25″	6.62″	5.00″	.063″	1.12″	1.06″	0.88″	8
3-1/2″	9.00″	7.25″	5.50″	.063″	1.19″	1.13″	0.88″	8
4″	10.00″	7.88″	6.19″	.063″	1.25″	1.19″	0.88″	8
5″	11.00″	9.25″	7.31″	.063″	1.38″	1.32″	0.88″	8
6″	12.50″	10.62″	8.50″	.063″	1.44″	1.38″	0.88″	12
8″	15.00″	13.00″	10.62″	.063″	1.62″	1.56″	1.00″	12
10″	17.50″	15.25″	12.75″	.063″	1.88″	1.82″	1.12″	16
12″	20.50″	17.75″	15.00″	.063″	2.00″	1.94″	1.25″	16
14″	23.00″	20.25″	16.25″	.063″	2.12″	2.06″	1.25″	20
16″	25.50″	22.50″	18.50″	.063″	2.25″	2.19″	1.38″	20
18″	28.00″	24.75″	21.00″	.063″	2.38″	2.32″	1.38″	24
20″	30.50″	27.00″	23.00″	.063″	2.50″	2.44″	1.38″	24
22″	33.00″	29.25″	25.25″	.063″	2.63″	2.57″	1.63″	24
24″	36.00″	32.00″	27.25″	.063″	2.75″	2.69″	1.62″	24

Blind flange dimensions class 400 in inches

FLANGE NPS	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	Raised Face Thickness (T)	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	3.75″	2.62″	0.12″	.250″	0.81″	0.56″	0.62″	4
3/4″	4.62″	3.25″	0.12″	.250″	0.87″	0.62″	0.75″	4
1″	4.88″	3.50″	0.12″	.250″	0.94″	0.69″	0.75″	4
1-1/4″	5.25″	3.88″	0.19″	.250″	1.06″	0.81″	0.75″	4
1-1/2″	6.12″	4.50″	0.25″	.250″	1.13″	0.88″	0.88″	4
2″	6.50″	5.00″	0.31″	.250″	1.25″	1.00″	0.75″	8
2-1/2″	7.50″	5.88″	0.31″	.250″	1.37″	1.12″	0.88″	8
3″