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Flanges

Welding Neck Flanges

Class	150	300	400	600	900	1500	2500
Diameter - A	30	38	38	38	38	38	43
Diameter - D	90	95	95	95	120	120	135
Thickness - B	9.6	12.7	14.3	14.3	22.3	22.3	30.2
	11.2	14.3	20.7	20.7	28.7	28.7	36.6
Diameter - G	35.1	35.1	35.1	35.1	35.1	35.1	35.1
Diameter - K	60.3	66.7	66.7	66.7	82.6	82.6	88.9
Height - H	46	51	52	52	60	60	73
	47.6	52.6	58.4	58.4	66.4	66.4	79.4
Bolt Holes	4	4	4	4	4	4	4
Diameter - L	15.9	15.9	15.9	15.9	22.2	22.2	22.2
Stud Bolts Diameter x Length
Diameter (in)	1/2	1/2	1/2	1/2	3/4	3/4	3/4
Length (mm)	55	65	75	75	110	110	120

Dimensional Tolerances of Welding Neck Flanges ASME B16.5

Outside Diameter = 24 = 1.6 mm | > 24 = ± 3.2 mm	Inside Diameter = 10 = ± 0.8 mm | 12 thru 18 = 1.6 mm | = 20 = + 3.2 mm / - 1.6 mm
Diameter of Contact Face 1.6 mm Raised Face = ± 0.8 mm 6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm	Diameter of Hub at Base = 24 = 1.6 mm | > 24 = ± 3.2 mm
Diameter of Hub at Point of Welding = 5 = + 2.4 mm / - 0.8 mm | = 6 = + 4.0 mm / - 0.8 mm	Drilling Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm Eccentricity of Bolt Circle with Respect to Facing = 2½ = 0.8 mm max. | = 3 = 1.6 mm max
Thickness = 18 = + 3.2 mm / - 0 | = 20 = + 4.8 mm / - 0	Length thru Hub = 10 = 1.6 mm | = 12 = ± 3.2 mm

 

Notes:

1. Dimensions are in millimeters unless otherwise indicated.
2. T = Nominal wall thickness of pipe. Bevel for Wall Thicknesses T from 5 mm to 22 mm inclusive.
3. The length of the stud bolt does not include the height of the chamfers (points).

OUR SUMMARY:

Reviewer

Ascent Engineering Company

Review Date

20-06-2018

Reviewed Product

Technical Info | Flanges

Author Rating

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