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Class 300 Steel Pipe Flanges
DIMENSIONAL SPECIFICATIONS

Class 300 Slip-On Flange Diagram

Class 300 Weld-Neck Flange Diagram

 Class 300 Blind Flange Diagram

 Class 300 Threaded Flange Diagram
 
Pipe
Size		 O C X A Y Y Y T B1 B B2 r Q
Outside
Diameter
of Flange		 *
Thickness
of
Flange,
Minimum		 **
Diameter
of
Hub		 Diameter
of
Weld Neck		 Threaded
Slip-On		 Lap-Joint Weld Neck Thread
Length
Threaded
Flange,
Minimum		 Slip-On,
Minimum		 Lap-Joint,
Minimum		 Weld Neck / Socket
Weld		 Lap-Joint
Flange
Radius		 Counter-bore
Threaded
Flange,
Minimum
 
1/2 3.75 0.56 1.50 0.84 0.88 0.88 2.06 0.62 0.88 0.90 0.62 0.12 0.91
3/4 4.62 0.62 1.88 1.05 1.00 1.00 2.25 0.62 1.09 1.11 0.82 0.12 1.14
1 4.88 0.69 2.12 1.32 1.06 1.06 2.44 0.69 1.36 1.38 1.05 0.12 1.41
1 1/4 5.25 0.75 2.50 1.66 1.06 1.06 2.56 0.81 1.70 1.72 1.38 0.19 1.75
1 1/2 6.12 0.81 2.75 1.90 1.19 1.19 2.69 0.88 1.95 1.97 1.61 0.25 1.99
2 6.50 0.88 3.31 2.38 1.31 1.31 2.75 1.12 2.44 2.46 2.07 0.31 2.50
2 1/2 7.50 1.00 3.94 2.88 1.50 1.50 3.00 1.25 2.94 2.97 2.47 0.31 3.00
3 8.25 1.12 4.62 3.50 1.69 1.69 3.12 1.25 3.57 3.60 3.07 0.38 3.63
3 1/2 9.00 1.19 5.25 4.00 1.75 1.75 3.19 1.44 4.07 4.10 3.55 0.38 4.13
4 10.00 1.25 5.75 4.50 1.88 1.88 3.38 1.44 4.57 4.60 4.03 0.44 4.63
5 11.00 1.38 7.00 5.56 2.00 2.00 3.88 1.69 5.66 5.69 5.05 0.44 5.69
6 12.50 1.44 8.12 6.63 2.06 2.06 3.88 1.81 6.72 6.75 6.07 0.50 6.75
8 15.00 1.62 10.25 8.63 2.44 2.44 4.38 2.00 8.72 8.75 7.98 0.50 8.75
10 17.50 1.88 12.62 10.75 2.62 3.75 4.62 2.19 10.88 10.92 10.02 0.50 10.88
12 20.50 2.00 14.75 12.75 2.88 4.00 5.12 2.38 12.88 12.92 12.00 0.50 12.94
14 23.00 2.12 16.75 14.00 3.00 4.38 5.62 2.50 14.14 14.18 13.25 0.50 14.19
16 25.50 2.25 19.00 16.00 3.25 4.75 5.75 2.69 16.16 16.19 15.25 0.50 16.19
18 28.00 2.38 21.00 18.00 3.50 5.12 6.25 2.75 18.18 18.20 17.25 0.50 18.19
20 30.50 2.50 23.12 20.00 3.75 5.50 6.38 2.88 20.20 20.25 19.25 0.50 20.19
24 36.00 2.75 27.62 24.00 4.19 6.00 6.62 3.25 24.25 24.25 23.25 0.50 24.19

Class 300 Series A     The flanges below from 30" - 48" conform to ASTM B16.47
Nominal Pipe Size Outside Diameter of Flange Minimum Thickness Of Flange Length Through Hub Diameter of Hub Hub Diameter
Top		 Raised Face Diameter Minimum Fillet Radius
r1
Weld Neck Blind
 
30 43.00 3.62 3.75 8.25 32.56 30.00 33.75 0.44
36 50.00 4.12 4.38 9.50 39.00 36.00 40.25 0.50
42 50.75 4.69 4.69 7.88 43.25 42.00 44.75 0.50
48 57.75 5.25 5.25 8.81 49.38 48.00 51.25 0.50

Class 300 Bolt Patterns & Bolt Lengths >

* Should flanges be required with flat face, shipments may be either the full thickness, or a thickness with raised face removed. (Removal of the raised face produces a non-standard length through the hub.)
** A taper shall not exceed 7 degrees on threaded, slip-on, and lap-joint flanges.


WELDBEND NOTES:

  1. All dimensions are in inches.

  2. Calculated flange weights on page 47.

  3. Dimensional tolerances on page 70.

  4. Standard flange facings on pages 72 & 73.

  5. Welding end bevel information on pages 74 & 75.

  6. Thread standards on page 76 & 77.

  7. Blind flanges may be produced with or without hubs.
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