Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5

OTHER DIA		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	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	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
lgth (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.
IMPORTANT! please read this short article

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)

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