Dimensions in Inches Weld Neck Flanges and Stud Bolts ASME B16.5 Class 2500

OTHER PRESSURE CLASSES

150

300

400

600

900

1500

2500

NPS	Dia D	THK B	Dia A	Dia OD	Height H	Dia K	Dia L
1/2	5.25	1.19	1.69	0.84	2.88	3.5	7/8
3/4	5.5	1.25	2	1.05	3.12	3.75	7/8
1	6.25	1.38	2.25	1.32	3.5	4.25	1
1.1/4	7.25	1.5	2.88	1.66	3.75	5.12	1.1/8
1.1/2	8	1.75	3.12	1.9	4.38	5.75	1.1/4
2	9.25	2	3.75	2.38	5	6.75	1.1/8
2.1/2	10.5	2.25	4.5	2.88	5.62	7.75	1.1/4
3	12	2.62	5.25	3.5	6.62	9	1.3/8
4	14	3	6.5	4.5	7.5	10.75	1.5/8
5	16.5	3.62	8	5.56	9	12.75	1.7/8
6	19	4.25	9.25	6.63	10.75	14.5	2.1/8
8	21.75	5	12	8.63	12.5	17.25	2.1/8
10	26.5	6.5	14.75	10.75	16.5	21.25	2.5/8
12	30	7.25	17.38	12.75	18.25	24.38	2.7/8

Stud Bolts for the flanges above

NPS	No of Bolt Holes	Dia Stud Bolts	Length Stud Bolts
1/2	4	3/4	4.75
3/4	4	3/4	5
1	4	7/8	5.5
1.1/4	4	1	6
1.1/2	4	1.1/8	6.75
2	8	1	7
2.1/2	8	1.1/8	7.75
3	8	1.1/4	8.75
4	8	1.1/2	10
5	8	1.3/4	11.75
6	8	2	13.5
8	12	2	15
10	12	2.1/2	19.25
12	12	2.3/4	21.25

Notes..

Dimensions are in inches unless otherwise indicated.
The length of the Stud Bolt does not include the height of the chamfers (points).
The length of the Stud Bolts includes one Spiral Wound Gasket with a 4.5mm thick sealing element, which is compressed to 3mm while tightening the Raised Face flange connection.
ID - Depending on the wall thickness of the pipe, must be specified by the purchaser.

Dimensional Tolerances Weld Neck Flanges ASME B16.5

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

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

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

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

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

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

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

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

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

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

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