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ASTM A335 Chrome Moly Pipe

Flange Tolerance

Sunny Steel is one of the oldest manufacturers, dealer, distributor, stockist & suppliers of Blind Flanges, Reducing Threaded Flanges, Lap Joint Flanges, Flange Gaskets, Threaded Flanges, Socketweld Flanges, Flanges Bolts, Ring Flange, Spectacle Blind Flanges, Weld Neck Flanges, Orifice Flange, Slip-On-Flanges, High Hub Blinds Flanges, which are manufactured using superior grade of steel like SS Flanges / Stainless Steel Flange, 310 Flanges, 321 Flanges, 202 Flanges, 347 Flanges, 304 Flange, 316 Flanges, 316L Flanges., These Flanges are most durable and manufactures to fit in different size of Pipes.

Our company offers a wide range of flanges like PL, SW, BL, WN,SO,LJ, ASME/ANSI B16.5 etc., which is precisely engineered in

Tolerance of Welding Neck Flanges
Outside Diameter When O.D. is 24" or less  ±1.6mm﹡
Inside Diameter 10" and smaller  ±0.8mm
12" thru 18"  ±1.6mm
20" and larger  +3.2mm, -1.6mm
Outside Diameter of hub 5" and smaller  +2.4mm, -0.8mm﹡
6" and larger  +4.0mm, -0.8mm
Diameter of contact face 1/16" rasied face tongue and groove male, female  ±0.8mm
1/4" rasied face tongue and groove male, female  ±0.4mm
Diameter of hub at base when hub base is 24" or smaller  ±1.6mm﹡
Diameter of hub at point of welding 5" and smaller  +2.4mm, -0.8mm
6" and larger  +4.0mm, -0.8mm
Drilling Bolt circle  ±1.6mm
Bolt hole spacing  ±0.8mm
Eccentricity of bolt circle with respect to facing 2 1/2" and smaller: 0.8mm, max﹡
Eccentricity of bolt circle with respect to bore 3" and larger: 1.6mm, max﹡
Thickness 18" and smaller  +3.2mm, -0mm
20" and larger  +4.8mm, -0mm
Length of thru hub 10" and smaller  ±1.6mm
12" and larger  ±3.2mm
Tolerance of Threaded Flanges, Socket Welding Flanges, Slip-On Flanges
Lap Joint Flanges and Blind Flanges
Outside Diameter When O.D. is 24" or less  ±1.6mm﹡
Inside Diameter Threaded Within limits on boring gauge
Socket welding, Slip-on and Lap joint, 10" and smaller  +0.8mm, -0mm
Socket welding, Slip-on and Lap joint, 12" and larger  +1.6mm, -0mm
Outside Diameter of hub 5" and smaller  +2.4mm, -0.8mm﹡
6" and larger  +4.0mm, -0.8mm
Diameter of contact face 1/16" rasied face tongue and groove male, female  ±0.8mm
1/4" rasied face tongue and groove male, female  ±0.4mm
Diameter of counterbore same as for inside diameter
Drilling Bolt circle ±1.6mm
Bolt hole spacing ±0.8mm
Eccentricity of bolt circle with respect to facing 2 1/2" and smaller: 0.8mm, max﹡
Eccentricity of bolt circle with respect to bore 3" and larger: 1.6mm, max﹡
Thickness 18" and smaller  +3.2mm, -0mm
20" and larger  +4.8mm, -0mm
Length of thru hub 10" and smaller  ±1.6mm
12" and larger  ±3.2mm
Dimensional tolerances for AWWA pipe flanges
Listed below are the Dimensional Tolerances to which flanges are manufactured. 
Ring type Slip-on and Blind flanges HUB type slip-on
O.D. <=24" +/- 0.6"(1.6mm) O.D. <=24" +/- 0.6"(1.6mm)
>24" +/- .12"(3.2mm) >24" +/- .12"(3.2mm)
I.D. Socket-Welding 10" and Samller
+.03"(0.8mm),-0"
I.D. 10" and Samller +.03"(0.8mm)
Slip-on and
Lap Joint
12" and Larger
+.06"(1.6mm),-0"
12"-18" +/-.06"(1.6mm)
20"-42" +.12"(3.2mm)
+.06"(1.6mm)
O.D. of Hub <=12" +.09"(2.4mm),
-.06"(1.6mm)
Diameter of
Contact Face
0.06" Raised Face +/-.03"(0.8mm)
14"-42" +/-.12"(3.2mm)
Diameter of Contact face 0.06" Raised Face +/- .03"(0.8mm) Diameter of Hub at base X<=24" +/-.06"(1.6mm)
X>24" +/-.12"(3.2mm)
Deameter of Contact face <=10" +.03"(0.8mm),
-0"
Diameter of Hub at point of Welding <=5" +.09"(2.4mm),
-.03"(0.8mm)
12"-42" +.06"(1.6mm),
-0"
>=6" +.16"(4.0mm),
-.03"(0.8mm)
Drilling Bolt Circle 1/2"-24"
/26"-42"
Drilling Bolt Circle 1/2"-24"
/26"-42"
+/-.06"(1.6mm)
+/-.06"
+/-.06"(1.6mm)
+/-.06"
Bolt hole
spacing
+/-.03"(0.8mm)
Bolt hole
spacing
+/-.03"(0.8mm)
Eccentricity of Bolt circle with respect to bore .03" Max.
(0.8mm)
Eccentricity of Bolt circle with respect to bore .03" Max.
(0.8mm)
Thickness 18"& Small +.12"(3.2mm),-0" Thickness 18"& Small +.12"(3.2mm),-0"
20"-42" +.19"(1.6mm) 20"-42" +.19"(1.6mm)
Length Thru Hub <=10" +/-.06"(1.6mm) Length Thru Hub <=10" +/-.06"(1.6mm)
12"-42" +/1.12"(3.2mm) 12"-42" +/1.12"(3.2mm)
These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.  The limits given are maximum.  Rigid inspection procedure assures the maintenance of high standards of accuracy in regular day to day production.
Standard we supply
ANSI
AWWA
ASME
DIN


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