Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5

OTHER DIAMETERS

1/2

3/4

1.1/4

1.1/2

2.1/2

3.1/2

NPS 3 - O.D. 88.9

CLass	150	300	600	900	1500	2500
DIA A	108	115	115	127	125	125
DIA D	190	210	210	240	265	305
THK B	22.3	27	31.8	38.1	47.7	66.7
THK B	23.9	28.6	38.2	44.5	54.1	73.1
DIA G	127	127	127	127	127	127
DIA K	152.4	168.3	168.3	190.5	205	230
H	68	78	83	102	117	168
H	69.6	79.6	89.4	108.4	123.4	174.4
NO. L	4	8	8	8	8	8
DIA L	19.1	22.2	22.2	25.4	31.8	34.9
Stud Bolts Diameter x Length
DIA (in)	5/8	3/4	3/4	7/8	1.1/8	1.1/4
Lenght (mm)	90	110	125	145	180	220

Notes..

Dimensions are in millimeters unless otherwise indicated.
The length of the Stud Bolt does not include the height of the chamfers (points).
ID = Depending on the wall thickness of the pipe, must be specified by the purchaser.

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

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

Dimensional Tolerances of Weld Neck Flanges ASME B16.5

Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤24
1.6 mm (0.06 in)
>24
±3.2 mm (±0.12 in)

Diameter Hub at Base
≤24
1.6 mm (0.06 in)
>24
±3.2 mm (±0.12 in)

Inside Diameter
≤10
±0.8 mm (±0.03 in)
12 thru 18
1.6 mm (0.06 in)
≥20
+3.2 mm / -1.6 mm
(±0.12 in / -0.06 in)

Diameter Hub at Point of Welding
≤5
+2.4 mm / -0.8 mm
(±0.09 in / -0.03 in)
≥6
+4.0 mm / -0.8 mm
(+0.15 in / -0.03 in)

Drilling
Bolt Circle
1.6 mm (0.06 in)
Bolt Hole Spacing
±0.8 mm (±0.03 in)

Eccentricity Bolt Circle
≤2.1/2
0.8 mm max (0.03 in max)
≥3
1.6 mm max (0.06 in max)

Thickness
≤18
+3.2 mm / -0 (+0.12 in / -0)
≥20
+4.8 mm / -0 (+0.18 in / -0)

Length thru Hub
≤10
1.6 mm (0.06 in)
≥12
±3.2 mm (±0.12 in)

Diameter Contact Face
1.6 mm RF (0.06 in)
±0.8 mm (±0.03 in)
6.35 mm RF (0.25 in)
±0.4 mm (±0.01 in)

Tongue and Groove
±0.4 mm (±0.01 in)
Male-Female
±0.4 mm (±0.01 in)

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Created on June 2, 2014

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