Dimensions Lap Joint Flanges & Stud Bolts ASME B16.5



Lap Joint flange

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

NPS 12 - ID = 328.2 - r = 13

CLass 150 300 600 900 1500 2500
DIA
A
365 375 400 420 451 441
DIA
D
485 520 560 610 675 760
THK
B
31.8 50.8 66.7 79.4 123.9 184.2
DIA
K
431.8 450.8 489 533.4 571.5 619.1
H 56 102 117 143 219 254
NO.
L
12 16 20 20 16 12
DIA
L
25.4 31.8 34.9 38.1 54 73
Stud Bolts Diameter x Length
DIA
(in)
7/8 1.1/8 1.1/4 1.3/8 2 2.3/4
Lenght
(mm)
120 170 220 255 375 540

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 Lap Joint Flanges ASME B16.5

Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter
≤ 10 = ± 0.8 mm
≥ 12 = + 1.6 mm / - 0 mm
Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm
≥ 14 = ± 3.2 mm
Diameter of Counterbore
Same as for Inside Diameter
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