Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5

OTHER DIA		NPS 10 - O.D. 273.0
CLass	150	300	600	900	1500	2500
DIA A	305	321	345	368	368	375
DIA D	405	445	510	545	585	675
THK B	30.2	47.7	69.9	76.3	114.4	171.5
DIA G	323.9	323.9	323.9	323.9	323.9	323.9
DIA K	362	387.4	431.8	469.9	485	539.7
H	101.6	117.6	158.4	190.4	260.4	425.4
NO. L	12	16	16	16	12	12
DIA L	25.4	28.6	34.9	38.1	50.8	66.7
Stud Bolts Diameter x Length
DIA (in)	7/8	1	1.1/4	1.3/8	1.7/8	2.1/2
lgth (mm)	115	160	215	235	335	490

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

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