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ANSI B16.1 Class 250 Flanges

Flange Size:

Flange Type:

Qty Needed:

Special Notes:

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ANSI B16.1 Class 250 Flanges Add Flanges

ANSI B16.1 250

* Bore - WN (B2): To be specified by purchaser

Nominal Size Outside Diameter
(OD) 		Thickness
(T) 		Raised Face Dia.
(R) 		Diameter at Base
(X) 		Bore - SO
(B) 		LTH - Weld Neck
(L2) 		LTH - SO
(L) 		Drilling - Bolt Circle
(BC) 		Drilling - Hole Diameter Drilling - No. of Holes Weight - Weld Neck
(lbs) 		Weight - Slip-on
(lbs) 		Weight - Blind
(lbs) 		* Bore - WN
(B2)
26 38.25 2.81 32.44 30.5 26.25 5.81 4.75 34.5 1.88 28 534 531 916 *
28 40.75 2.94 34.94 33 28.25 5.94 5 37 1.88 28 629 637 1095 *
30 43 3 37.19 35.25 30.25 6 5 39.25 1.88 28 702 707 1236 *
32 45.25 3.12 39.44 37.5 32.25 6.12 5.12 41.5 1.88 28 793 801 1424 *
34 47.5 3.25 41.44 39.5 34.25 6.25 5.25 43.5 1.88 28 882 889 1649 *
36 50 3.38 43.69 41.5 36.25 6.38 5.38 46 2.13 32 969 970 1884 *
38 52.25 3.44 45.69 43.5 38.25 6.44 5.5 48 2.13 32 1057 1062 2094 *
40 54.25 3.56 47.94 45.75 40.25 6.56 5.5 50.25 2.13 36 1158 1172 2336 *
42 57 3.69 50.44 47.75 42.25 6.94 5.62 52.75 2.125 36 1318 1288 2673 *
44 59.25 3.75 52.69 49.75 44.25 7 5.75 55 2.13 36 1423 1397 2935 *
46 61.5 3.88 54.94 51.75 46.25 7.12 5.88 57.25 2.13 40 1536 1510 3272 *
48 65 4 58.44 54 48.25 7.25 6 60.75 2.13 40 1824 1797 3768 *

Notes

Dimensions are in inches.
ANSI B16.1 is a gray iron pipe flange and fitting specification.
Steel flanges are occasionally produced to mate up with Class 125 and Class 250 valves.
These flange dimensions are provided for reference even though specification does not cover steel.
These flanges are typically supplied with a flat face.
The flanges are typically supplied with a flat face.