API 605 Flanges | ASME B16.47 Series B | Large Diameter
API 605 flanges are large-diameter carbon and alloy steel flanges built for the structural and space challenges of high-volume, low-pressure fluid transmission. The American Petroleum Institute set the original API 605 specification, and it now sits fully inside the modern ASME B16.47 Series B standard. The flanges cover nominal pipe sizes from 26 inches up to 60 inches. The whole design idea behind them is weight and footprint. Next to their Series A counterparts (the former MSS SP-44), Series B flanges run a smaller bolt circle, use more bolts of a smaller diameter, and carry a thinner cross-section. That geometry cuts material mass and shrinks the clearance you need to install them, which makes them cost-effective and far easier to handle on big infrastructure. PM Industries manufactures, supplies, and stocks these flanges in a full range of sizes, classes, and materials.
The lighter profile does not cost you strength. API 605 flanges hold up structurally and retain pressure well inside their rated envelope, which usually spans Class 75, 150, and 300. We forge them from high-grade carbon steel, low-temperature steel, and corrosion-resistant stainless alloys, then heat treat them to raise fracture toughness and relieve internal stress. They give you a secure, leak-proof joint when tying large pipelines into valves, pumps, and storage tanks. The high count of smaller bolts spreads clamping force evenly across the gasket face, which lifts sealing efficiency and keeps the localized flange deformation that comes with thermal swings and pipe stress in check.
Because they seal reliably while cutting weight and material cost, API 605 flanges earn their place across high-volume transport and distribution work. You will find them on long-distance oil and gas transmission lines, large water treatment plants, and municipal pipelines. Their light build also suits low-pressure refining loops, marine intake systems, and industrial ductwork, where heavy thick-walled flanges would load down pipe racks and foundations for no good reason.
PM Industries holds API 605 flanges in stock, mainly in weld neck and blind styles with raised face (RF) and flat face (FF) options. Every flange ships with certification and test documentation to match your project spec. Tell us your size, class, style, and material, and we will quote it.
Specification API 6A Flanges
| Standards | ANSI/ASME B16.5, B16.48, ANSI Flanges, GOST Flanges, DIN Flanges, EN-1092, B16.47 Series A & B, ASME Flanges, EN Flanges, AWWA Flanges, BS Flanges. |
| JIS Standard | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K |
| DIN FLANGES | DIN 2527, 2627, 2631, 2656, 2576, 2673, 2629, 2628, 2566, 2641, 2637, 2655, 2634, 2636, 2632, 2633, 2638, 2642, 2573, 2635. |
| Pressure Rating | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| Types | Threaded, Plate, Screwed, Forged. |
| Supporting material | Gasket, Ring Joint, Flange Bolts |
| Size range | 1/2" (15 NB) to 48" (1200NB) DN10~DN5000 |
| Production technique | Forged, machined and Heat treated |
| Available Flange Type | Weld Neck Flanges, RTJ Flanges, Slip On Flanges, Spectacle Blind Flanges, Flanges Gaskets, Square Flanges, Standard Insert Flanges, High Hub Blinds Flanges, Flat Flanges, forged flanges, Weldo / Nipo Flanges, Jacket Insert Flanges, Tongue groove Flanges, Blind Flanges, Socket Weld Flanges, Large diameter Flanges, Long Weld Neck Flanges, Spacer Blinds, SWRF Flanges, SORF Flanges, Angle Face Rings Flanges, Spades Ring Spacers Flanges, WNRF Flanges, Screwed Flanges, Insert Flanges, flanges bolts, cf flange, Lap Joint Flanges, ASME B16.36 Orifice Flanges, Plate Flange, Expander Flanges, Ring Type Joint Flanges, Loose Flanges, Reducing Flanges, puddle flange, Threaded Flanges, blank flange, vacuum flange. |
| Connect Type/ Flange Face Type | Ring Type Joint (RTJ), Flat Face (FF), Tongue & Groove, Small Male-Female (SMF), Lap-Joint Face (LJF), Raised Face (RF), Large Male-Female (LMF), Small Tongue. |
| Custom design | As per your drawing |
| Test | Direct-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine. |
| Origin | Indian / USA / Korean / West Europe / Japan |
| Pressure Class | PN 6 TO PN 100 |
| Thickness | Normal Pipe Size ≤ 18 |
| Bore Diameter | Normal Pipe ≤ 10 |
| High Temperature | Above 200°C (400°F) For Class 150 Or Above 400°C (750°F) |
| Low Temperature | Above -29 Degree C (−20°F) |
| Coating/Surface Treatment: | Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized. |
| European/African/Russian Standard Flanges | Available |
| Gaskets Types | Full Face, Metallic Ring, Flat Ring Gasket |
Marking Standard | Name of Manufacturer |
| Schedule | |
| Type of Flange Facing | |
| Pressure Class | |
| Nominal Pipe Size, etc | |
Test Certificates | EN 10204/3.1B, NACE MR0103, NACE MR0175 |
| Raw Materials Certificate | |
| 100% Radiography Test Report | |
| Third Party Inspection Report, etc |
Flange Type Available
Api Flanges Pressure Ratings
Flange Size | Working Pressure (PSI) | Outside Diameter | Number of Bolt Holes | Diameter of Bolt Holes | Length of Bolts | API Ring Gasket |
|---|---|---|---|---|---|---|
1-13/16" | 10,000 | 7-3/8" | 8 | 3/4" | 5-1/4" | BX-151 |
1-13/16" | 15,000 | 8-3/16" | 8 | 7/8" | 6" | BX-151 |
1-13/16" | 20,000 | 10-1/8" | 8 | 1" | 7-3/4" | BX-151 |
2-1/16" | 2,000 | 6-1/2" | 8 | 5/8" | 5/8" | R-23 |
2-1/16" | 3,000/5,000 | 8-1/2" | 8 | 7/8" | 7/8" | R-24 |
2-1/16" | 10,000 | 7-7/8" | 8 | 3/4" | 3/4" | BX-152 |
2-1/16" | 15,000 | 8-3/4" | 8 | 7/8" | 7/8" | BX-152 |
2-1/16" | 20,000 | 11-5/16" | 8 | 1-1/8" | 1-1/8" | BX-152 |
2-9/16" | 2,000 | 7-1/2" | 8 | 3/4" | 5-1/4" | R-26 |
2-9/16" | 3,000/5,000 | 9-5/8" | 8 | 1" | 7" | R-27 |
2-9/16" | 10,000 | 9-1/8" | 8 | 7/8" | 6-1/4" | BX-153 |
2-9/16" | 15,000 | 10" | 8 | 1" | 7" | BX-153 |
2-9/16" | 20,000 | 12-13/16" | 8 | 1-1/4" | 9-1/2" | BX-153 |
3-1/8" | 2,000 | 8-1/4" | 8 | 3/4" | 5-1/2" | R-31 |
3-1/8" | 3,000 | 9-1/2" | 8 | 7/8" | 6-1/4" | R-31 |
3-1/8" | 5,000 | 10-1/2" | 8 | 1-1/8" | 7-3/4" | R-35 |
3-1/16" | 10,000 | 10-5/8" | 8 | 1" | 7-1/4" | BX-154 |
3-1/16" | 15,000 | 11-5/16" | 8 | 1-1/8" | 8" | BX-154 |
3-1/16" | 20,000 | 14-1/16" | 8 | 1-3/8" | 10-3/4" | BX-154 |
4-1/16" | 2,000 | 10-3/4" | 8 | 7/8" | 6-1/4" | R-37 |
4-1/16" | 3,000 | 11-1/2" | 8 | 1-1/8" | 7-1/2" | R-37 |
4-1/16" | 5,000 | 12-1/4" | 8 | 1-1/8" | 8-3/8" | BX-155 |
4-1/16" | 20,000 | 17-9/16" | 8 | 1-3/4" | 12-3/4" | BX-155 |
5-1/8" | 5,000 | 14-3/4" | 8 | 1-1/2" | 10-3/4" | R-44 |
7-1/16" | 2,000 | 14" | 12 | 1" | 7-1/2" | R-45 |
7-1/16" | 3,000 | 15" | 12 | 1-1/8" | 8-1/2" | R-45 |
7-1/16" | 5,000 | 15-1/2" | 12 | 1-3/8" | 11-1/4" | R-46 |
7-1/16" | 10,000 | 18-7/8" | 12 | 1-1/2" | 11-3/4" | BX-156 |
7-1/16" | 15,000 | 19-7/8" | 16 | 1-1/2" | 13" | BX-156 |
7-1/16" | 20,000 | 24-13/16" | 16 | 2" | 17-3/4" | BX-156 |
9" | 2,000 | 16-1/2" | 12 | 1-1/8" | 8-1/2" | R-49 |
9" | 3,000 | 18-1/2" | 12 | 1-3/8" | 9-1/2" | R-49 |
9" | 5,000" | 19" | 12 | 1-5/8" | 12-1/2" | R-50 |
9" | 10,000 | 21-3/4" | 16 | 1-1/2" | 13-1/4" | BX-157 |
9" | 15,000 | 25-1/2" | 16 | 1-7/8" | 16" | BX-157 |
11" | 2,000 | 20" | 16 | 1-1/4" | 9-1/4" | R-53 |
11" | 3,000 | 21-1/2" | 16 | 1-3/8" | 10" | R-53 |
11" | 5,000 | 23" | 12 | 1-7/8" | 14-1/4" | R-54 |
11" | 10,000 | 25-3/4" | 16 | 1-3/4" | 15-3/8" | BX-158 |
11" | 15,000 | 32" | 20 | 2" | 19-1/2" | BX-158 |
13-5/8" | 2,000 | 22" | 20 | 1-1/4" | 9-1/2" | R-57 |
13-5/8" | 3,000 | 24" | 20 | 1-3/8" | 10-3/4" | R-57 |
13-5/8" | 5,000 | 26-1/2" | 16 | 1-5/8" | 12-3/4" | BX-160 |
13-5/8" | 10,000 | 30-1/4" | 20 | 1-7/8" | 17-3/4" | BX-159 |
13-5/8" | 15,000 | 34-7/8" | 20 | 2-1/4" | 21" | BX-159 |
16-3/4" | 2,000 | 27" | 20 | 1-1/2" | 10-3/4" | R-65 |
16-3/4" | 3,000 | 27-3/4" | 20 | 1-5/8" | 12-1/4" | R-66 |
16-3/4" | 5,000 | 30-3/8" | 16 | 1-78" | 14-3/4" | BX-162 |
16-3/4" | 10,000 | 34-5/16" | 24 | 1-7/8" | 17-3/4" | BX-162 |
18-3/4" | 5,000 | 35-5/8" | 20 | 2" | 18" | BX-163 |
16-3/4" | 10,000 | 40-15/16" | 24 | 2-1/4" | 23" | BX-164 |
20-3/4" | 3,000 | 33-3/4" | 20 | 2" | 15-1/4" | R-74 |
21-1/4" | 2,000 | 32" | 24 | 1-5/8" | 12-1/2" | R-73 |
21-1/4" | 5,000 | 39" | 24 | 2" | 19" | BX-165 |
21-1/4" | 10,000 | 45" | 24 | 2-1/2" | 24-3/4" | BX-166 |
26-3/4" | 2,000 | 41" | 20 | 1-3/4" | 14-1/4" | BX-167 |
21-1/4" | 3,000 | 43-3/8" | 24 | 2" | 17-1/2" | BX-168 |
Application
- Food & Beverage
- Paper Industry
- Pharmaceutical
- Hospital Equipment
- Textiles
- Dairy
- Aircraft
- Chemicals
- Others Parts in Machinery
Testing
- Hydrostatic Test
- Macro Test
- Ultra Sonic Test (UT)
- Micro Test
- Hardness Test
- Radiography Test
- Pitting Resistance Test
- PMI Testing
- Mechanical Testing
- X-ray detector
Packing
- Wooden Boxes
- Shrink-Wrappedt
- Carton Boxes
- Wooden Crates
- Wooden Pallets
