Dimensions Blind Flanges & Stud Bolts ASME B16.5



Blind flange

OTHER DIAMETERS
1/2
3/4
1
2
3
4
6
8
10
12
14
16
18
20
24

NPS 4

CLass 150 300 600 900 1500 2500
DIA
D
230 255 275 290 310 355
B 22.3 30.2 38.1 44.5 54 76.2
23.9 31.8 44.5 50.9 60.4 82.6
DIA
G
157.2 157.2 157.2 157.2 157.2 157.2
DIA
K
190.5 200 215.9 235 240 273
NO.
L
8 8 8 8 8 8
DIA
L
19.1 22.2 25.4 31.8 34.9 41.3
Stud Bolts Diameter x Length
DIA
(in)
5/8 3/4 7/8 1.1/8 1.1/4 1.1/2
Lenght
(mm)
90 115 145 170 195 255

Important Information

Notes..



Studs are measured parallel to the axis (L) from the first to the thread without the chamfers (points). S = free threads equals 1/3 time bolt dia

Measuring lengths of Stud Bolts


Hex bolts are measured from under the head to the top of de bolt


Measuring lengths of Hex bolts

Dimensional Tolerances of Blind Flanges ASME B16.5

Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter
not applicable
Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm
≥ 14 = ± 3.2 mm
Drilling
Bolt Circle = 1.6 mm
Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle
≤ 2.1/2 = 0.8 mm max.
≥ 3 = 1.6 mm max.
Thickness
≤ 18 = + 3.2 mm / - 0
≥ 20 = + 4.8 mm / - 0
Length thru Hub
≤ 18 = + 3.2 mm / - 0.8 mm
≥ 20 = + 4.8 mm / - 1.6 mm
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face, Tongue and Groove / Male-Female = ± 0.4 mm