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 18

CLass 150 300 600 900 1500 2500
DIA
D
635 710 745 785 915 ...
B 38.1 58.8 82.6 101.6 162 ...
39.7 60.4 89 108 168.4 ...
DIA
G
533.4 533.4 533.4 533.4 533.4 ...
DIA
K
577.9 628.6 654 685.8 775 ...
NO.
L
16 24 20 20 16 ...
DIA
L
31.8 34.9 44.5 50.8 73 ...
Stud Bolts Diameter x Length
DIA
(in)
1.1/8 1.1/4 1.5/8 1.7/8 2.3/4 ...
Lenght
(mm)
145 195 275 325 495 ...

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