Expander Flange is a Welding Neck pipe flange where the nominal size of the non-flanged end is larger than the nominal size of the flanged end. They can be used to change the size of a pipe run. These are usually used to increase the line size to the first or second larger size. This is an alternative to using a separate reducer and weld neck flange combination. The expander flange can be used to connect pipe to pumps, compressors and Valves.

Expander flanges are also known as a cost effective alternative to using a separate reducer-welding neck flange combination. The expander flange is available in a range of sizes and materials.

It’s compact size saves space when compared to a reducer-welding neck flange

Only one butt-weld is needed to install the Expander Flange Very cost effective and competitively priced.
Full range of sizes available

Dimensions Expander Flanges, ANSI CLASS 150, ASME B16.5, 1/16″ RAISED FACE (IN) DATASHEET

  • Dimensions per ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.

data expander b16.5 150300 16ADesign Type Adata expander b16.5 150300 16CDesign Type Cdata expander b16.5 150300 16DDesign Type D

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of

Bore


D2

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of

Hub


K

Compound

Taper

 


CT

Slope

at

Bevel


SB

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

(lb)

Design

Type

2 x 3 6 3 5/8 3/4 2.067 3.068 3.500 3 1/16 2 1/2 16° 4 3/4 4 3/4 6 A
2 x 4 6 3 5/8 3/4 2.067 4.026 4.500 3 1/16 3 5/8 1/2 29° * 4 3/4 4 3/4 6 C
3 x 4 7 1/2 5 15/16 3.068 4.026 4.500 4 1/4 2 3/4 15° 4 3/4 6 11 A
4 x 6 9 6 3/16 15/16 4.026 6.065 6.625 5 5/16 3 1/4 1/2 30° * 8 3/4 7 1/2 15 C
6 x 8 11 8 1/2 1 6.065 7.981 8.625 7 9/16 4 1/2 28° * 8 7/8 9 1/2 24 C
8 x 10 13 1/2 10 5/8 1 1/8 7.981 10.020 10.750 9 11/16 4 1/2 29° * 8 7/8 11 3/4 39 C
8 x 12 13 1/2 10 5/8 1 1/8 7.981 12.000 12.750 9 11/16 6 1/2 29° * 8 7/8 11 3/4 39 C
10 x 12 16 12 3/4 1 3/16 10.020 12.000 12.750 12 3 15/16 1/2 39° * 12 1 14 1/4 52 C
10 x 14 16 12 3/4 1 3/16 10.020 13.250 14.000 12 5 7/16 5/8 30° * 12 1 14 1/4 52 C
12 x 14 19 15 1 1/4 12.000 13.250 14.000 14 3/8 4 1/2 11° 12 1 17 80 D
12 x 16 19 15 1 1/4 12.000 15.250 16.000 14 3/8 4 13/16 5/8 30° * 12 1 17 80 C
14 x 16 21 16 1/4 1 3/8 13.250 15.250 16.000 15 3/4 5 15° 12 1 1/8 18 3/4 120 A
14 x 18 21 16 1/4 1 3/8 13.250 17.250 18.000 15 3/4 5 11/16 5/8 30° * 12 1 1/8 18 3/4 120 C
18 x 20 25 21 1 9/16 17.250 19.250 20.000 19 7/8 5 1/2 14° 16 1 1/4 22 3/4 140 A
18 x 24 25 21 1 9/16 17.250 23.250 24.000 19 7/8 8 13/16 5/8 28° * 16 1 1/4 22 3/4 140 C
20 x 24 27 1/2 23 1 11/16 19.250 23.250 24.000 22 6 7/16 5/8 30° * 20 1 1/4 25 170 C
24 x 30 32 27 1/4 1 7/8 23.250 29.250 30.000 26 1/8 8 11/16 3/4 30° * 20 1 3/8 29 1/2 260 C
  • * The slope at the welding bevel approximates 1:3 maximum size. The flange bore has a compound angle of 18° through dimension “CT” and the remaining taper as indicated.

Dimensions Expander Flanges, ANSI CLASS 300, ASME B16.5, 1/16″ RAISED FACE (IN) DATASHEET

  • Dimensions per ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.

data expander b16.5 150300 16ADesign Type Adata expander b16.5 150300 16BDesign Type B
data expander b16.5 150300 16CDesign Type Cdata expander b16.5 150300 16CDesign Type D

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of

Bore


D2

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of

Hub


K

Compound

Taper

 


CT

Slope

at

Bevel


SB

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

(lb)

Design

Type

2 x 3 6 1/2 3 5/8 7/8 2.067 3.068 2.375 3 5/16 2 3/4 15° 8 3/4 5 9 A
2 x 4 6 1/2 3 5/8 7/8 2.067 4.026 2.375 3 5/16 2 3/4 1/2 29° * 8 3/4 5 9 C
3 x 4 8 1/4 5 1 1/8 3.068 4.026 3.500 4 5/8 3 1/8 13° 8 7/8 6 5/8 15 D
4 x 6 10 6 3/16 1 1/4 4.026 6.065 4.500 5 3/4 3 3/8 1/2 30° * 8 7/8 7 7/8 25 C
6 x 8 12 1/2 8 1/2 1 7/16 6.065 7.981 6.625 8 1/8 3 7/8 1/2 22° * 12 7/8 10 5/8 42 B
8 x 10 15 10 5/8 1 5/8 7.981 10.020 8.625 10 1/4 4 3/8 20° 12 1 13 67 A
10 x 12 17 1/2 12 3/4 1 7/8 10.020 12.000 10.750 12 5/8 4 5/8 20° 16 1 1/8 15 1/4 91 A
12 x 14 20 1/2 15 2 12.000 13.250 12.750 14 3/4 5 1/8 11° 16 1 1/4 17 3/4 138 D
14 x 16 23 16 1/4 2 1/8 13.250 15.250 14.000 16 3/4 5 5/8 16° 20 1 1/4 20 1/4 186 D
16 x 18 25 1/2 18 1/2 2 1/4 15.250 17.250 16.000 19 5 3/4 16° 20 1 3/8 22 1/2 246 D
18 x 20 28 21 2 3/8 17.250 19.250 18.000 21 6 1/4 14° 24 1 3/8 24 3/4 305 D
20 x 24 30 1/2 23 2 1/2 19.250 23.250 20.000 23 1/8 6 3/8 5/8 29° * 24 1 3/8 27 378 B
24 x 30 36 27 1/4 2 3/4 23.250 29.250 24.000 27 5/8 6 5/8 3/4 30° * 24 1 5/8 32 545 B

Dimensions Expander Flanges, ANSI CLASS 600, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions per ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter

data expander b16.5 150300 16ADesign Type Adata expander b16.5 150300 16BDesign Type B
data expander b16.5 150300 16CDesign Type Cdata expander b16.5 150300 16CDesign Type D

 
Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of

Bore


D2

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of

Hub


K

Compound

Taper

 


CT

Slope

at

Bevel


SB

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

(lb)

Design

Type

2 x 3 6 1/2 3 5/8 1 * * 2.375 3 5/16 2 7/8 14° 8 3/4 5 12 A
2 x 4 6 1/2 3 5/8 1 * * 2.375 3 5/16 2 7/8 1/2 29° ** 8 3/4 5 12 C
3 x 4 8 1/4 5 1 1/4 * * 3.500 4 5/8 3 1/4 13° 8 7/8 6 5/8 23 D
4 x 6 10 3/4 6 3/16 1 1/2 * * 4.500 6 4 21° 8 1 8 1/2 42 A
6 x 8 14 8 1/2 1 7/8 * * 6.625 8 3/4 4 5/8 21° 12 1 1/8 11 1/2 81 D
8 x 10 16 1/2 10 5/8 2 3/16 * * 8.625 10 3/4 5 1/4 19° 12 1 1/4 13 3/4 117 D
10 x 12 20 12 3/4 2 1/2 * * 10.750 13 1/2 6 16° 16 1 3/8 17 189 D
12 x 14 22 15 2 5/8 * * 12.750 15 3/4 6 1/8 10° 20 1 3/8 19 1/4 226 D
14 x 16 23 3/4 16 1/4 2 3/4 * * 14.000 17 6 1/2 15° 20 1 1/2 20 3/4 347 D
16 x 18 27 18 1/2 3 * * 16.000 19 1/2 7 14° 20 1 5/8 23 3/4 481 D
18 x 20 29 1/4 21 3 1/4 * * 18.000 21 1/2 7 1/4 14° 20 1 3/4 25 3/4 555 D
20 x 24 32 23 3 1/2 * * 20.00 24 7 1/2 5/8 28° ** 24 1 3/4 28 1/2 690 E
24 x 30 37 27 1/4 4 * * 24.00 28 1/4 8 3/4 28° ** 24 2 33 977 C
  • * To be specified by purchaser.
  • ** The slope at the welding bevel approximates 1:3 maximum size. The flange bore has a compound angle of 18° through dimension “CT” and the remaining taper as indicated.

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