FLANGE TOLERANCES
GENERAL NOTE: Dimensions are in inches.
*Outside Diameter of Flange (dimension O)
OD 12
OD 12, 24
OD 24
0.060
0.120
0.190
Thickness of Flange (dimension C)
Raised Face, Class 400 and above Flat Face, RTJ,
NPS 18 and smaller
0.120, zero
NPS 20 and larger
0.190, zero
Class 300 Flat Face Flanges
NPS 18 and smaller
0.120, 0.060
NPS 20 and larger
0.190, 0.060
Hub
*Diameter of hub at base (dimension X)
NPS 5 and smaller
0.030
NPS 6 and larger
0.060
Taper of hub
 7
Outside diameter of welding end of welding
neck flanges (dimension A)
NPS 5 and smaller
0.09, 0.03
NPS 6 and larger
0.16, 0.03
Wall thickness (welding neck flanges)
min. 87.5% of the nominal
Length Through Hub (dimension Y)
Welding Neck
NPS 4 and smaller 0.060
NPS 5 to 10, inclusive 0.060, 0.120
NPS 12 and larger
0.120, 0.180
*Slip-On, Threaded,
NPS 10 and smaller
0.060
NPS 12 and larger
0.120
Bore
Slip-On, Counter-bore Threaded
(dimension B and Q)
NPS 10 and smaller
0.030, zero
NPS 12 and larger
0.060, zero
Welding Neck (dimension B)
Is ±0.5% of nominal value
Facings
*Facing Height
0.010
Diameter of raised face (dimension R)
Class 150, 300 (0.06 in. raised face)
Class 400 + (0.25 in. raised face)
Ring Joint Facing
Depth (dimension E)
0.016, zero
Width (dimension F)
0.008
Pitch diameter (dimension P)
0.005
Radius at bottom (dimension R)
R  0.060
0.030, zero
R  0.060
0.030
23 degree angle
½ deg.
0.030
0.020
Drilling and Facing
Diameter of bolt circle
0.060
Center-to-center of adjacent bolt holes
0.030
Eccentricity between bolt circle and diameter and
machined facing diameters
NPS 2 ½ and smaller 0.030
NPS 3 and larger
0.060
*Diameter of bolt holes
0.020
Pressure Tap Location
Smaller than NPS 4
NPS 4 and larger
0.020
0.030
Note: Tolerances marked with an * are
Kerkau Tolerances
Visit www. Kerkau.com or call toll free 1-800-248-5060
BORE SCHEDULES
ASME B36.10M - 1996
NOMINAL WALL THICKNESS AND INSIDE DIAMETER
Nominal
Outside WALL
Pipe
Diameter
I.D.
Size
26
26.000
28
28.000
30
32
34
36
38
30.000
32.000
34.000
36.000
38.000
40
40.000
42
42.000
44
46
48
4
5
6
8
10
12
44.000
46.000
48.000
4.500
5.563
6.625
8.625
10.750
12.750
14
14.000
16
16.000
18
20
22
24
18.000
20.000
22.000
24.000
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
Wall
I.D.
5
10
20
30
STD.
40
60
XH
80
100
120
140
160
XXH
--------.250
29.500
------------------------------------.083
4.334
.109
5.345
.109
6.407
.109
8.407
.134
10.482
.156
12.438
.156
13.688
.165
15.670
.165
17.670
.188
19.624
.188
21.624
.218
23.564
.312
25.376
.312
27.376
.312
29.376
.312
31.376
.312
33.376
.312
35.376
------------------------.120
4.260
.134
5.295
.134
6.357
.148
8.329
.165
10.420
.180
12.390
.250
13.500
.250
15.500
.250
17.500
.250
19.500
.250
21.500
.250
23.500
----.500
27.000
.500
29.000
.500
31.000
.500
33.000
.500
35.000
------------------------------------.250
8.125
.250
10.250
.250
12.250
.312
13.376
.312
15.376
.312
17.376
.375
19.250
.375
21.250
.375
23.250
----.625
26.750
.625
28.750
.625
30.750
.625
32.750
.625
34.750
------------------------.188
4.124
--------.277
8.071
.307
10.136
.330
12.090
.375
13.250
.375
15.250
.438
17.124
.500
19.000
.500
21.000
.562
22.876
.375
25.250
.375
27.250
.375
29.250
.375
31.250
.375
33.250
.375
35.250
.375
37.250
.375
39.250
.375
41.250
.375
43.250
.375
45.250
.375
47.250
.237
4.026
.258
5.047
.280
6.065
.322
7.981
.365
10.020
.375
12.000
.375
13.250
.375
15.250
.375
17.250
.375
19.250
.375
21.250
.375
23.250
------------.688
30.624
.688
32.624
.688
34.624
------------------------.237
4.026
.258
5.047
.280
6.065
.322
7.981
.365
10.020
.406
11.938
.438
13.124
.500
15.000
.562
16.876
.594
18.812
----.688
22.624
------------------------------------------------------------.406
7.813
.500
9.750
.562
11.626
.594
12.812
.656
14.688
.750
16.500
.812
18.376
.875
20.250
.969
22.062
.500
25.000
.500
27.000
.500
29.000
.500
31.000
.500
33.000
.500
35.000
.500
37.000
.500
39.000
.500
41.000
.500
43.000
.500
45.000
.500
47.000
.337
3.826
.375
4.813
.432
5.761
.500
7.625
.500
9.750
.500
11.750
.500
13.000
.500
15.000
.500
17.000
.500
19.000
.500
21.000
.500
23.000
------------------------------------------------.337
3.826
.375
4.813
.432
5.761
.500
7.625
.594
9.562
.688
11.374
.750
12.500
.844
14.312
.938
16.124
1.031
17.938
1.125
19.750
1.219
21.562
------------------------------------------------------------.594
7.437
.719
9.312
.844
11.062
.938
12.124
1.031
13.938
1.156
15.688
1.281
17.438
1.375
19.250
1.531
20.938
------------------------------------------------.438
3.624
.500
4.563
.562
5.501
.719
7.187
.844
9.062
1.000
10.750
1.094
11.812
1.219
13.562
1.375
15.250
1.500
17.000
1.625
18.750
1.812
20.376
------------------------------------------------------------.812
7.001
1.000
8.750
1.125
10.500
1.250
11.500
1.438
13.124
1.562
14.876
1.750
16.500
1.875
18.250
2.062
19.876
------------------------------------------------.531
3.438
.625
4.313
.719
5.187
.906
6.813
1.125
8.500
1.312
10.126
1.406
11.188
1.594
12.812
1.781
14.438
1.969
16.062
2.125
17.750
2.344
19.312
------------------------------------------------.674
3.152
.750
4.063
.864
4.897
.875
6.875
1.000
8.750
1.000
10.750
-------------------------
Note: Dimensions are in inches.
Note: Bore schedules with wall thickness greater than .88 are in bold print, indicating different welding end contour.
visit www.Kerkau.com or call toll free 1-800-248-5060
SLIP-ON WELDING
ANSI B16.36 300# SLIP ON ORIFICE DIMENSIONS
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THREADED
ANSI B16.36 300# THREADED ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 300# WN ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 600# WN ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 900# WN ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 1500# WN ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 2500# WN ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 600# WN RTJ ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 900# WN RTJ ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 1500# WN RTJ ORIFICE DIMENSIONS
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WELDING NECK
ANSI B16.36 2500# WN RTJ ORIFICE DIMENSIONS