Dimensions Threaded Flanges & Stud Bolts ASME B16.5

Threaded flange

NPS 1/2

CLass	150	300	600	900	1500	2500
DIA A	30	38	38	38	38	43
DIA D	90	95	95	120	120	135
THK B	9.6	12.7	14.3	22.3	22.3	30.2
THK B	11.2	14.3	20.7	28.7	28.7	36.6
DIA G	35.1	35.1	35.1	35.1	35.1	35.1
DIA K	60.3	66.7	66.7	82.6	82.6	88.9
H	14	21	22	32	32	40
H	15.6	22.6	28.4	38.4	38.4	46.4
NO. L	4	4	4	4	4	4
DIA L	15.9	15.9	15.9	22.2	22.2	22.2
Stud Bolts Diameter x Length
DIA (in)	1/2	1/2	1/2	3/4	3/4	3/4
Len mm	55	65	75	110	110	120

Other Diameters
NPS	1/2	3/4	1	1.1/4	1.1/2	2	2.1/2

Notes:

Dimensions are in millimeters unless otherwise indicated.
The length of the Stud Bolt does not include the height of the chamfers (points).

Measuring lengths of Stud Bolts and Hex Bolts

Menu Flanges

Definition & Details of Flanges

Special Flanges

Dims & Tolerances ASME B16.5

Dims Weld Neck Flanges Blind Flanges ASME B16.47

Dims Orifice Flanges RF

Class 300-2500

Dims Orifice Flanges RTJ

Class 600-2500

Dims Ring Joint Facings ASME B16.5 Class 150-2500

Class 150

Dims & Tolerances [Inches] ASME B16.5

Welding Neck Flanges

API Specification 6A

Dims 6B Flanges

BS 3293 Flange Dimensions

Weld Neck and Slip-On flanges

Dimensional Tolerances of Threaded Flanges ASME B16.5

Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤ 24 = 1.6 mm
> 24 = ± 3.2 mm

Inside Diameter
Within Limits on Boring Gauge

Drilling
Bolt Circle = 1.6 mm
Bolt Hole Spacing = ± 0.8 mm

Eccentricity of Bolt Circle
≤ 2.1/2 = 0.8 mm max.
≥ 3 = 1.6 mm max.

Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm
≥ 14 = ± 3.2 mm

Diameter of Counterbore
Same as forInside Diameter

Thickness
≤ 18 = + 3.2 mm / - 0
≥ 20 = + 4.8 mm / - 0

Length thru Hub
≤ 18 = + 3.2 mm / - 0.8 mm
≥ 20 = + 4.8 mm / - 1.6 mm

Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face, Tongue and Groove / Male-Female = ± 0.4 mm

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