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 3/4 - O.D. 26.7

CLass	150	300	600	900	1500	2500
DIA A	38	48	48	44	44	51
DIA D	100	115	115	130	130	140
THK B	11.2	14.3	15.9	25.4	25.4	31.8
THK B	12.8	15.9	22.3	31.8	31.8	38.2
DIA G	42.9	42.9	42.9	42.9	42.9	42.9
DIA K	69.9	82.6	82.6	88.9	88.9	95
H	51	56	57	70	70	79
H	52.6	57.6	63.4	76.4	76.4	85.4
NO. L	4	4	4	4	4	4
DIA L	15.9	19.1	19.1	22.2	22.2	22.2
Stud Bolts Diameter x Length
DIA (in)	1/2	5/8	5/8	3/4	3/4	3/4
Lenght (mm)	65	75	90	115	115	125

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.

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)