Dimensional tolerances for AWWA Standard flanges

These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.

Listed below are the Dimensional Tolerances to which flanges are manufactured.    The limits given are maximum. 

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)

Rigid inspection procedure assures the maintenance of high standards of accuracy in regular day to day production.



AWWA Flange Charts and Drawings

These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.
AWWA Ring Flanges


SUNNY STEEL

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

Link exchange

Copyright © 2011 Sunny Steel Enterprise Ltd.  All Rights Reserved ICP No.:08010763