Supplier of Expander Flange | ASME/ANSI B16.5, B16.47 Series A & B, B16.48
An Expander Flange is a type of flange used to connect pipes or other components of different diameters. It is designed with a tapered bore that gradually increases in size, allowing for the seamless connection of smaller diameter pipes to larger ones. Expander flanges are commonly used in piping systems where there is a need to transition between different pipe sizes, ensuring a secure and leak-proof joint. They can be customized to meet specific project requirements, including pressure ratings, materials, and dimensions, making them a versatile and reliable solution for many piping applications.
Ample Alloys is a leading manufacturer and supplier specializing in a wide range of high-quality industrial products, including expander flanges. With years of experience in the industry, we are committed to delivering reliable, durable, and cost-effective solutions to a diverse array of industries. we pride ourselves on our ability to provide customized products that meet the specific needs of our clients. Our offerings are available in various materials such as carbon steel, stainless steel, alloy steels, and duplex steels, all of which are sourced from the most trusted suppliers worldwide.
Carbon Steel Expander Flanges, Stainless Steel Expander Flanges, High-Pressure Expander Flanges, Weld Neck Expander Flanges, High-Temperature Expander Flanges, Durable Expander Flanges, Expander Flanges for Power Plants, Expander Flanges with Tapered Bore
Pipe Expander Flanges
Size Range
15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12
Flange Face Type
FF—Flat Face, RF—Raised Face, FM—Female Face, M—Male Face, T—Tongue Face, G—Groove Face, RJ—Ring Joint.
Stainless Steel
ASTM A182 F 304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.
Standards / Dimension
ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN
Carbon Steel
ASTM A105/A105N (SA105N), LTCS A350 LF2, A694
Alloy Steel
ASTM A182 / SA182 - F1 / F5 / F9 / F11 / F12 / F22 / F91
Pressure Class
150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64.
Duplex & Super Duplex
ASTM A182 / ASME SA182 - S31803, S32205, 2205, S32750, S32760, S32950, 2507.
MTC
EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103
| 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 |
| 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 |
| 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 |
Industrial Expander Flanges Standards
Expander Flange Standards are designed to ensure that expander flanges meet industry requirements for safety, durability, and performance in various piping systems. These standards specify the dimensions, material properties, and pressure ratings necessary for expander flanges to be used effectively in industrial applications.
- ASME/ANSI Standards (American):
- ASME B16.5 – Pipe Flanges and Flanged Fittings (NPS 1/2" to 24").
- ASME B16.47 – Large Diameter Steel Flanges (Series A & B, NPS 26" to 60").
- ASME B16.36 – Orifice Flanges.
- ASME B16.48 – Line Blanks (Spectacle, Spade, and Spacer Flanges).
- ANSI B16.1 – Cast Iron Flanges and Flanged Fittings.
- ANSI B16.42 – Ductile Iron Pipe Flanges and Flanged Fittings.
- ISO Standards (International)
- ISO 7005-1 – Steel Flanges for General Applications.
- ISO 7005-2 – Cast Iron Flanges.
- ISO 7005-3 – Copper Alloy Flanges.
- EN Standards (European)
- EN 1092-1 – Steel Flanges.
- EN 1092-2 – Cast Iron Flanges.
- EN 1092-3 – Copper Alloy Flanges.
- EN 1092-4 – Aluminium Alloy Flanges.
- DIN Standards (German)
- DIN 2527 – Blind Flanges.
- DIN 2576 – Slip-On Flanges (PN 10).
- DIN 2633 – Weld Neck Flanges (PN 16).
- DIN 2634 – Weld Neck Flanges (PN 25).
- DIN 2635 – Weld Neck Flanges (PN 40).
- JIS Standards (Japanese)
- JIS B2220 – Steel Pipe Flanges.
- GOST Standards (Russian)
- GOST 12820 – Flat Flanges for Steel Pipe Joints.
- GOST 12821 – Steel Welded Flanges for High-Pressure Applications.
- GOST 33259 – Flange Connections for Industrial Equipment and Pipelines.
- BS Standards (British)
- BS 4504 – Circular Flanges for Pipes, Valves, and Fittings.
- BS 10 – Specification for Flanges and Bolting.
- API Standards (Oil & Gas)
- API 6A – Wellhead and Christmas Tree Equipment Flanges.
- API 605 – Large-Diameter Carbon Steel Flanges (merged into ASME B16.47 Series B).
- AWWA Standards (Waterworks)
- AWWA C207 – Steel Ring Flanges for Waterworks Service.
- MSS Standards (Manufacturer's Standardization Society)
- MSS SP-44 – Steel Pipe Flanges (merged into ASME B16.47 Series A).
- MSS SP-51 – Flanges for Glass-Lined Equipment.
- Material-Specific Standards (ASTM)
- ASTM A105 – Carbon Steel Forged Flanges.
- ASTM A182 – Alloy and Stainless Steel Forged Flanges.
- ASTM A350 – Carbon and Low-Alloy Steel Flanges for Low-Temperature Service.
- ASTM A694 – High-Strength Carbon and Alloy Steel Flanges for High-Pressure Applications.
- Other Regional and Specialized Standards
- KS B1511 – Korean Standard Flanges.
- NF E29-206 – French Standard Flanges.
- SANS 1123 – South African Standard for Steel Flanges.
Why Ample Alloys For SS Expander Flanges!
Choose Ample Alloys for reliable, high-quality expander flanges.
Premium Materials
We use high-quality materials like carbon steel, stainless steel, and alloy steels, ensuring durability and corrosion resistance.
Industry Compliance
Our expander flanges meet global standards like ANSI/ASME B16.5, EN 1092-1, and JIS B2220 for precision and reliability.
Proven Experience
With years of industry experience, we deliver high-quality products across diverse sectors like oil & gas and power generation.
On-Time Delivery
Our efficient processes ensure timely delivery, keeping your projects on track.
Expander flanges are commonly used in industries such as oil & gas, chemical processing, power generation, and water treatment for connecting pipes of different sizes or transitioning between different pressure classes.
Expander flanges come in a variety of sizes, typically ranging from 1/2" to 48" or larger, with customization available to meet specific project requirements.
Expander flanges adhere to industry standards like ANSI/ASME B16.5, EN 1092-1, JIS B2220, and BS 4504, ensuring proper dimensions, material properties, and performance.
