Khawla Flanges, a trusted manufacturer and supplier based in Muscat, Oman, specializes in delivering high-quality flange solutions that meet the demanding needs of modern industries. Among its reliable product range, Stainless Steel Flat Flanges are valued for their precision, durability, and versatility in a wide variety of piping systems. Produced with advanced fabrication techniques and strict quality control, these flanges offer dependable performance in both standard and corrosive environments. Khawla Flanges is committed to providing products that align with global standards, ensuring long-lasting reliability and supporting critical sectors such as water treatment, chemical processing, oil and gas, and construction.
Stainless Steel Flat Flanges typically contain 16–18% chromium, 8–10% nickel, and small additions of manganese, silicon, and carbon, depending on grade, providing excellent corrosion resistance and formability. Their mechanical properties include a tensile strength of approximately 520–620 MPa and a yield strength of about 210–260 MPa, ensuring dependable performance under moderate pressure conditions. The high chromium content enhances resistance to oxidation and chemical attack, while their structural stability offers good ductility and impact toughness. These characteristics make them suitable for general-purpose piping, fluid handling, and applications involving mild to moderately corrosive environments.
| Specification | ASTM A182 / ASME SA182 |
|---|---|
| Size Chart | 1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000 |
| Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092 |
| Pressure Rating ANSI | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| Pressure Calculation in DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 |
| UNI | 6Bar 10Bar 16Bar 25Bar 40Bar |
| EN | 6Bar 10Bar 16Bar 25Bar 40Bar |
| Coating | Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized |
| Test Certificates | EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc |
| Production Technique | Forged, Heat treated and machined |
| Connect Type/ Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove |
| Special design | As per your drawing AS, ANSI, BS, DIN and JIS 15 NB (1/2″) to 200 NB (8″) Equal and Reducing Configurations |
| Test | Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector |
| Equipment | Press machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc |
| Manufacturer of | ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc. BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange B.S: BS4504 , BS3293, BS1560, BS10 AS 2129: Table D; Table E; Table H ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings ANSI : ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48 ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 American standard (ANSI) German (DIN) British standard (BS) DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638 ASTM A182 F316 Stainless Steel Flanges The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276 |
| Grades | SS 304, 304L, 304H, 310, 310S, 316, 316L, 316H, 316Ti, 317, 317L, 321, 321H, 347, 347H, 446, 904L |
| Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175 | |
Khawla Flanges, a leading supplier in Muscat, OMAN, offers an extensive selection of Stainless Steel Flat Flanges, including weld neck flanges, slip-on flanges, blind flanges, threaded flanges, and lap joint flanges. Designed for diverse industrial applications, our high-quality inventory and commitment to exceptional service make us a trusted choice for flange products in the region.
Stainless Steel Flat Flanges are widely used in low-pressure piping systems where secure connections, easy assembly, and corrosion resistance are essential. They are ideal for water supply networks, food processing lines, pharmaceutical equipment, and HVAC systems due to their hygienic properties and clean surface finish. In chemical and petrochemical industries, these flanges are used for moderately corrosive fluid lines and equipment assemblies. Their flat, gasket-friendly design allows simple installation and maintenance, making them suitable for inspection points, pipe terminations, and system extensions. Their reliability and versatility make them a preferred choice across various industrial and commercial sectors.
| USA | France | Germany | Germany | Italy | Japan | Russia | Spain | Sweden | OMAN | European Union |
| AISI | AFNOR | DIN 17006 | W.N. 17007 | UNI | JIS | GOST | UNE | SIS | BSI | EURONORM |
| 304 | Z 6 CN 18-09 | X 5 CrNi 18 10 X 5 CrNi 18 12 | 1.4301 1.4303 | X 5 CrNi 1810 | SUS 304 | 08KH18N10 06KH18N11 | X 6 CrNi 19-10 | 23 32 | 304S15 304S16 | X 6 CrNi 18 10 |
| 304L | Z 2 CN 18-10 | X 2 CrNi 18 11 | 1.4306 | X 2 CrNi 1911 | SUS 304L | 03KH18N11 | X 2 CrNi 19-10 | 23 52 | 304S11 | X 3 CrNi 18 10 |
| 304H | – | – | 1.4948 | X 8 CrNi 1910 | SUS F 304H | – | X 6 CrNi 19-10 | – | – | – |
| 310 | – | X 12 CrNi 25 21 | 1.4841 | X 22 CrNi 2520 | SUH 310 | 10KH23N18 | – | – | 310S24 | – |
| 310S | Z 12 CN 25-20 | X 12 CrNi 25 20 | 1.4845 | X 5 CrNi 2520 | SUS 310S | 20KH25N20S2 | – | 23 61 | – | X 6 CrNi 25 20 |
| 316 | Z 6 CND 17-11 | X 5 CrNiMo 17 12 2 | 1.4401 | X 5 CrNiMo 1712 | SUS 316 | X 6 CrNiMo 17-12-03 | 23 47 | 316S31 | X 6 CrNiMo 17 12 2 | |
| 316 | Z 6 CND 17-12 | X 5 CrNiMo 17 13 3 | 1.4436 | X 5 CrNiMo 1713 | SUS 316 | X 6 CrNiMo 17-12-03 | 23 43 | 316S33 | X 6 CrNiMo 17 13 3 | |
| 316H | X 8 CrNiMo 1712 | SUS F 316H | X 5 CrNiMo 17-12 | |||||||
| 316H | X 8 CrNiMo 1713 | 03KH17N14M2 | X 6 CrNiMo 17-12-03 | |||||||
| 316L | Z 2 CND 17-12 | X 2 CrNiMo 17 13 2 | 1.4404 | X 2 CrNiMo 1712 | SUS 316L | X 2 CrNiMo 17-12-03 | 23 48 | 316S11 | X 3 CrNiMo 17 12 2 | |
| 316L | Z 2 CND 17-13 | X 2 CrNiMo 18 14 3 | 1.4435 | X 2 CrNiMo 1713 | X 2 CrNiMo 17-12-03 | 23 53 | 316S13 | X 3 CrNiMo 17 13 3 | ||
| Z 2 CND 17-13-Az | X 2 CrNiMoN 17 13 3 | 1.4429 | X 2 CrNiMoN 1713 | 08KH17N13M2T 10KH17N13M2T | 23 75 | |||||
| Z6 CNDT 17-12 | X 6 CrNiMoTi 17 12 2 | 1.4571 | X 6 CrNiMoTi 1712 | 08KH17N13M2T 10KH17N13M2T | X 6 CrNiMoTi 17-12-03 | 23 50 | 320S31 | X 6 CrNiMoTi 17 12 2 | ||
| X 10 CrNiMoTi 18 12 | 1.4573 | X 6 CrNiMoTi 1713 | 08KH16N13M2B | X 6 CrNiMoTi 17-12-03 | 320S33 | X 6 CrNiMoTI 17 13 3 | ||||
| Z 6 CNDNb 17-12 | X 6 CrNiMoNb 17 12 2 | 1.4580 | X 6 CrNiMoNb 1712 | 09KH16N15M3B | X 6 CrNiMoNb 17 12 2 | |||||
| X 10 CrNiMoNb 18 12 | 1.4583 | X 6 CrNiMoNb 1713 | X 6 CrNiMoNb 17 13 3 | |||||||
| 317 | X 5 CrNiMo 1815 | SUS 317 | 23 66 | 317S16 | ||||||
| 317L | Z 2 CND 19-15 | X 2 CrNiMo 18 16 4 | 1.4438 | X 2 CrNiMo 1815 | SUS 317L | 23 67 | 317S12 | X 3 CrNiMo 18 16 4 | ||
| 317L | Z 2 CND 19-15 | X 2 CrNiMo 18 16 4 | 1.4438 | X 2 CrNiMo 1816 | SUS 317L | 23 67 | 317S12 | |||
| 321 | Z 6 CNT 18-10 | X 6 CrNiTi 18 10 X 12 CrNiTi 18 9 | 1.4541 1.4878 | X 6 CrNiTi 1811 | SUS 321 | 12KH18N10T | X 6 CrNiTi 18-11 | 23 37 | 321S31 | X 6 CrNiTi 18 10 |
| 321H | X 8 CrNiTi 1811 | SUS 321H | X 7 CrNiTi 18-11 | 321S20 | ||||||
| 347 | Z 6 CNNb 18-10 | X 6 CrNiNb 18 10 | 1.4550 | X 6 CrNiNb 1811 | SUS 347 | X 6 CrNiNb 18-11 | 23 38 | 347S31 | X 6 CrNiNb 18 10 | |
| 347H | X 8 CrNiNb 1811 | SUS F 347H | X 7 CrNiNb 18-11 | |||||||
| 904L | Z 12 CNDV 12-02 | 1.4939 |
| NPS | Pipe Diameter | Flange Inside Daimeter | Number of holes | Flange Daimeter | Thickness of Flange | Daimeter of Bolt Circle | Daimeter of Bolt Holes | Approx.Weight in kg | |
| DN | ISO | DIN | D5 | BN | D | b | K | d2 | KG/PCS |
| 10 | – | 14 | 14.5 | 4 | 90 | 16 | 60 | 14 | 0.7 |
| 17.2 | – | 17.7 | 4 | 90 | 16 | 60 | 14 | 0.69 | |
| 15 | – | 20 | 21 | 4 | 95 | 16 | 65 | 14 | 0.77 |
| 21.3 | – | 22 | 4 | 95 | 16 | 65 | 14 | 0.77 | |
| 20 | – | 25 | 26 | 4 | 105 | 18 | 75 | 14 | 1.06 |
| 26.9 | – | 27.6 | 4 | 105 | 18 | 75 | 14 | 1.05 | |
| 25 | – | 30 | 31 | 4 | 115 | 18 | 85 | 14 | 1.27 |
| 33.7 | – | 34.4 | 4 | 115 | 18 | 85 | 14 | 1.25 | |
| 32 | – | 38 | 39 | 4 | 140 | 18 | 100 | 18 | 1.86 |
| 42.4 | – | 43.1 | 4 | 140 | 18 | 100 | 18 | 1.83 | |
| 40 | – | 44.5 | 45.5 | 4 | 150 | 18 | 110 | 18 | 2.12 |
| 48.3 | – | 49 | 4 | 150 | 18 | 110 | 18 | 2.09 | |
| 50 | – | 57 | 58.1 | 4 | 165 | 20 | 125 | 18 | 2.78 |
| 60.3 | – | 61.1 | 4 | 165 | 20 | 125 | 18 | 2.74 | |
| 65 | 76.1 | – | 77.1 | 8 | 185 | 22 | 145 | 18 | 3.48 |
| 80 | 88.9 | – | 90.3 | 8 | 200 | 24 | 160 | 18 | 4.33 |
| 100 | – | 108 | 109.6 | 8 | 235 | 24 | 190 | 22 | 5.82 |
| 114.3 | – | 115.9 | 8 | 235 | 24 | 190 | 22 | 5.61 | |
| 125 | – | 133 | 134.8 | 8 | 270 | 26 | 220 | 26 | 7.91 |
| 139.7 | – | 141.6 | 8 | 270 | 26 | 220 | 26 | 7.6 | |
| 150 | – | 159 | 161.1 | 8 | 300 | 28 | 250 | 26 | 10.12 |
| 168.3 | – | 170.5 | 8 | 300 | 28 | 250 | 26 | 9.58 | |
| 175 | 193.7 | – | 196.1 | 12 | 350 | 32 | 295 | 30 | 14.45 |
| 200 | 219.1 | – | 221.8 | 12 | 375 | 34 | 320 | 30 | 16.9 |
| 250 | – | 267 | 270.2 | 12 | 450 | 38 | 385 | 33 | 27.28 |
| 273 | – | 276.2 | 12 | 450 | 38 | 385 | 33 | 26.51 | |
| 300 | 323.9 | – | 327.6 | 16 | 515 | 42 | 450 | 33 | 36.38 |
| 350 | 355.6 | – | 359.7 | 16 | 580 | 46 | 510 | 36 | 52.83 |
| – | 368 | 372.2 | 16 | 580 | 46 | 510 | 36 | 50.24 | |
| 400 | 406.4 | – | 411 | 16 | 660 | 50 | 585 | 39 | 74.71 |
| – | 419 | 423.7 | 16 | 660 | 50 | 585 | 39 | 71.44 | |
| 500 | 508 | – | 513.6 | 20 | 755 | 52 | 670 | 42 | 86.87 |
| 600 | 610 | – | 616.5 | 20 | 890 | 54 | 795 | 48 | 121.84 |
| 700 | 711 | – | 716 | 24 | 995 | 58 | 900 | 48 | 150.93 |
| 800 | 813 | – | 818 | 24 | 1140 | 64 | 1030 | 56 | 219.08 |
| 900 | 914 | – | 920 | 28 | 1250 | 70 | 1140 | 56 | 271.16 |
| 1000 | 1016 | – | 1022 | 28 | 1360 | 78 | 1250 | 56 | 344.95 |
| ASME/ANSI B 16.5 | Flat Face Flange |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| ASME/ANSI B 16.47 | Blind Flange [Series A & B],Flat Face Flange |
| PRESSURE CLASS | 75, 150, 300, 400, 600, 900 |
| ASME/ANSI B 16.36 | Flat Face Flange |
| PRESSURE CLASS | 300, 400, 600, 900, 1500, 2500 |
| PRESSURE CLASS | PN 2.5 TO PN 40 |
| BS 4504[PART 1] | Hubbed Slip-On |
| PRESSURE CLASS | PN 2.5 TO PN 400 |
| BS 1560 BOSS | Hubbed Slip-On Hubbed Flat Face |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| BS10 | Plate Slip-On Flange, Slip-On Boss Flange |
| TABLE | D, E, F, H |
| DIN FLANGES | DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673 |
| PRESSURE CLASS | PN 6 TO PN 100 |
Yes, we offer custom sizes for Stainless Steel Flat Flanges to meet specific project needs. Our team at Khawla Flanges is committed to providing tailored solutions for all your requirements. For more details, contact us at sales@khawlaflanges.com.
We are renowned for delivering products with precise, accurate dimensions. Each product undergoes thorough testing, both destructive and non-destructive, to ensure quality before being shipped to our customers.
Our team is ready to assist you. Contact us for any queries or personalized solutions.
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