Khawla Flanges, a reputable manufacturer and supplier located in Muscat, Oman, has built a solid reputation for providing top-notch Mild Steel Flanges tailored to meet a variety of industrial needs. With a keen emphasis on precision engineering, durability, and cost-effectiveness, the company guarantees that each flange adheres to international standards, ensuring reliable connectivity in piping systems. Khawla Flanges prides itself on utilizing advanced manufacturing techniques, rigorous quality checks, and prompt delivery, making it a go-to choice for clients in the oil & gas, construction, water treatment, and general engineering sectors throughout Oman and the broader Gulf region.
Mild Steel Flanges are mainly made from low-carbon steel, which contains small amounts of carbon, manganese, sulfur, and phosphorus. This composition provides excellent weldability and good ductility. They offer moderate tensile strength, impact resistance, and structural stability, making them perfect for medium-pressure applications. Additionally, these flanges are easy to machine and can be adapted to various surface treatments like galvanizing or coating for improved corrosion resistance. Their mechanical properties enable them to thrive in diverse industrial settings while keeping costs in check.
| Specifications | MS |
|---|---|
| Size Ranges | From 1/2 inch (i.e. 15 NB) upto 48 inch (i.e. 1200NB) |
| JIS Standards | 5 K, 10K, 16K, 20 K, 30K, 40K, 63 K |
| Flange Face Type | FF, RF, LMF, SMF, RTJ, LJF. |
| Pressure Classes | Cl 150, Class 300, Cl. 400, 600, Class 900, Cl 1500 and 2500 |
| Standards | ASME | BS | DIN | ANSI | GOST | EN Flange |
| UNI/ DIN / EN Standard | 6Bar, 10 Bar, 16Bar, 25 Bar, 40Bar |
| Composition | Content |
|---|---|
| Sulfur, S | ≤ 0.050 % |
| Iron, Fe | 98.81 – 99.26 % (as remainder) |
| Carbon, C | 0.14 – 0.20 % |
| Manganese, Mn | 0.60 – 0.90 % |
| Phosphorous, P | ≤ 0.040 % |
| Mechanical Properties | Metric | Imperial |
|---|---|---|
| Hardness, Knoop (Converted from Brinell hardness) | 145 | 145 |
| Hardness, Brinell | 126 | 126 |
| Tensile Strength, Yield | 370 MPa | 53700 psi |
| Elongation at Break (In 50 mm) | 15.0 % | 15.0 % |
| Poissons Ratio | 0.290 | 0.290 |
| Reduction of Area | 40.0 % | 40.0 % |
| Machinability (Based on AISI 1212 steel. as 100% machinability) | 70 % | 70 % |
| Modulus of Elasticity | 205 GPa | 29700 ksi |
| Bulk Modulus | 140 GPa | 20300 ksi |
| Shear Modulus | 80.0 GPa | 11600 ksi |
| Hardness, Vickers (Converted from Brinell hardness) | 131 | 131 |
| Hardness, Rockwell B (Converted from Brinell hardness) | 71 | 71 |
| Tensile Strength, Ultimate | 440 MPa | 63800 psi |
| Size inches | Size (millimeter) | Flange Thk. | O.D. | RF Height | RF Diam. | PCD | Bolt Size UNC | No. of Bolts | Machine Bolt Length | Hole Size | RF Stud Length | ISO Stud Size | Wt in kilogram |
| B | A | D | C | E | |||||||||
| 1/2 | 15 | 9.6 | 90 | 2 | 34.9 | 60.3 | 1/2 | 4 | 50 | 5/8 | 55 | M14 | 0.9 |
| 3/4 | 20 | 11.2 | 100 | 2 | 42.9 | 69.9 | 1/2 | 4 | 50 | 5/8 | 65 | M14 | 0.9 |
| 1 | 25 | 12.7 | 110 | 2 | 50.8 | 79.4 | 1/2 | 4 | 55 | 5/8 | 65 | M14 | 0.9 |
| 1 1/4 | 32 | 14.3 | 115 | 2 | 63.5 | 88.9 | 1/2 | 4 | 55 | 5/8 | 70 | M14 | 1.4 |
| 1 1/2 | 40 | 15.9 | 125 | 2 | 73 | 98.4 | 1/2 | 4 | 65 | 5/8 | 70 | M14 | 1.8 |
| 2 | 50 | 17.5 | 150 | 2 | 92.1 | 120.7 | 5/8 | 4 | 70 | 3/4 | 85 | M16 | 2.3 |
| 2 1/2 | 65 | 20.7 | 180 | 2 | 104.8 | 139.7 | 5/8 | 4 | 75 | 3/4 | 90 | M16 | 3.2 |
| 3 | 80 | 22.3 | 190 | 2 | 127 | 152.4 | 5/8 | 4 | 75 | 3/4 | 90 | M16 | 4.1 |
| 3 1/2 | 90 | 22.3 | 215 | 2 | 139.7 | 177.8 | 5/8 | 8 | 75 | 3/4 | 90 | M16 | 5.9 |
| 4 | 100 | 22.3 | 230 | 2 | 157.2 | 190.5 | 5/8 | 8 | 75 | 3/4 | 90 | M16 | 7.7 |
| 5 | 125 | 22.3 | 255 | 2 | 185.7 | 215.9 | 3/4 | 8 | 85 | 7/8 | 95 | M20 | 9.1 |
| 6 | 150 | 23.9 | 280 | 2 | 215.9 | 241.3 | 3/4 | 8 | 85 | 7/8 | 100 | M20 | 11.8 |
| 8 | 200 | 27 | 345 | 2 | 269.9 | 298.5 | 3/4 | 8 | 90 | 7/8 | 110 | M20 | 20.5 |
| 10 | 250 | 28.6 | 405 | 2 | 323.8 | 362 | 7/8 | 12 | 100 | 1 | 115 | M24 | 32 |
| 12 | 300 | 30.2 | 485 | 2 | 381 | 431.8 | 7/8 | 12 | 100 | 1 | 120 | M24 | 50 |
| 14 | 350 | 33.4 | 535 | 2 | 412.8 | 476.3 | 1 | 12 | 115 | 1 1/8 | 135 | M27 | 64 |
| 16 | 400 | 35 | 595 | 2 | 469.9 | 539.8 | 1 | 16 | 115 | 1 1/8 | 135 | M27 | 82 |
| 18 | 450 | 38.1 | 635 | 2 | 533.4 | 577.9 | 1 1/8 | 16 | 125 | 1 1/4 | 145 | M30 | 100 |
| 20 | 500 | 41.3 | 700 | 2 | 584.2 | 635 | 1 1/8 | 20 | 140 | 1 1/4 | 160 | M30 | 130 |
| 24 | 600 | 46.1 | 815 | 2 | 692.2 | 749.3 | 1 1/4 | 20 | 150 | 1 3/8 | 170 | M33 | 196 |
Khawla Flanges, a leading supplier in Muscat, OMAN, offers an extensive selection of Mild Steel 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.
These Mild Steel Flanges are commonly found in piping systems across the oil & gas, petrochemical, construction, water supply, and HVAC industries, thanks to their ease of fabrication and robust structural integrity. They are particularly well-suited for connecting pipes, valves, pumps, and equipment in low- to medium-pressure scenarios. Moreover, these flanges are favored in fire-fighting systems, irrigation setups, and general engineering projects where reliable performance and affordability are essential. Their versatility, strength, and compatibility with various piping materials make them ideal for both industrial and commercial applications.
| NPS | O.D. of Flange | Flanges Thickness | Diameter of RF | Diameter of Hub at Base | Lengtd Tdru Hub | Bore or Diameter | Dia. of Hub at Bevel | Radius of Fillet | Deptd of Socket | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Welding (WN) Neck | Slip-On (SORF) Threaded (NPT) Socket (SWRF) | Lap Joint (Loose) | Slip-on (SORF) Socket (SWRF) | Lap Joint (Loose) | ||||||||
| O | Q | R | X | Y | Y | Y | W | B | H | r | Z | |
| 1/2 | 3-1/2 | 7/16 | 1-3/8 | 1-3/16 | 1-7/8 | 5/8 | 5/8 | .88 | .90 | .84 | 1/8 | 3/8 |
| 3/4 | 3-7/8 | 1/2 | 1-11/16 | 1-1/2 | 2-1/16 | 5/8 | 5/8 | 1.09 | 1.11 | 1.05 | 1/8 | 7/16 |
| 1 | 4-1/4 | 9/16 | 2 | 1-15/16 | 2-3/16 | 11/16 | 11/16 | 1.36 | 1.38 | 1.32 | 1/8 | 1/2 |
| 1-1/4 | 4-5/8 | 5/8 | 2-1/2 | 2-5/16 | 2-1/4 | 13/16 | 13/16 | 1.70 | 1.72 | 1.66 | 3/16 | 9/16 |
| 1-1/2 | 5 | 11/16 | 2-7/8 | 2-9/16 | 2-7/16 | 7/8 | 7/8 | 1.95 | 1.97 | 1.90 | 1/4 | 5/8 |
| 2 | 6 | 3/4 | 3-5/8 | 3-1/16 | 2-1/2 | 1 | 1 | 2.44 | 2.46 | 2.38 | 5/16 | 11/16 |
| 2-1/2 | 7 | 7/8 | 4-1/8 | 3-9/16 | 2-3/4 | 1-1/8 | 1-1/8 | 2.94 | 2.97 | 2.88 | 5/16 | 3/4 |
| 3 | 7-1/2 | 15/16 | 5 | 4-1/4 | 2-3/4 | 1-3/16 | 1-3/16 | 3.57 | 3.60 | 3.50 | 3/8 | 13/16 |
| 3-1/2 | 8-1/2 | 15/16 | 5-1/2 | 4-13/16 | 2-13/16 | 1-1/4 | 1-1/4 | 4.07 | 4.10 | 4.00 | 3/8 | 7/8 |
| 4 | 9 | 15/16 | 6-3/16 | 5-5/16 | 3 | 1-5/16 | 1-5/16 | 4.57 | 4.60 | 4.50 | 7/16 | 15/16 |
| 5 | 10 | 15/16 | 7.5/16 | 6-7/16 | 3-1/2 | 1-7/16 | 1-7/16 | 5.66 | 5.69 | 5.56 | 7/16 | 15/16 |
| 6 | 11 | 1 | 8-1/2 | 7-9/16 | 3-1/2 | 1-9/16 | 1-9/16 | 6.72 | 6.75 | 6.63 | 1/2 | 1-1/16 |
| 8 | 13-1/2 | 1-1/8 | 10-5/8 | 9-11/16 | 4 | 1-3/4 | 1-3/4 | 8.72 | 8.75 | 8.63 | 1/2 | 1-1/4 |
| 10 | 16 | 1-3/16 | 12-3/4 | 12 | 4 | 1-15/16 | 1-15/16 | 10.88 | 10.92 | 10.75 | 1/2 | 1-5/16 |
| 12 | 19 | 1-1/4 | 15 | 14-3/8 | 4-1/2 | 2-3/16 | 2-3/16 | 12.88 | 12.92 | 12.75 | 1/2 | 1-9/16 |
| 14 | 21 | 1-3/8 | 16-1/4 | 15-3/4 | 5 | 2-1/4 | 3-1/8 | 14.14 | 14.18 | 14.00 | 1/2 | 1-5/8 |
| 16 | 23-1/2 | 1-7/16 | 18-1/2 | 18 | 5 | 2-1/2 | 3-7/16 | 16.16 | 16.19 | 16.00 | 1/2 | 1-3/4 |
| 18 | 25 | 1-9/16 | 21 | 19-7/8 | 5-1/2 | 2-11/16 | 3-13/16 | 18.18 | 18.20 | 18.00 | 1/2 | 1-15/16 |
| 20 | 27-1/2 | 1-11/16 | 23 | 22 | 5-11/16 | 2-7/8 | 4-1/16 | 20.20 | 20.25 | 20.00 | 1/2 | 2-1/8 |
| 24 | 32 | 1-7/8 | 27-1/4 | 26-1/8 | 6 | 3-1/4 | 4-3/8 | 24.25 | 24.25 | 24.00 | 1/2 | 2-1/2 |
| Nominal Pipe Sizes (NPS) | Slip On (SORF) | Threaded (NPT) | Socket Weld (SWRF) | Lap Joint (Loose) | Blind (BLRF) | Weld Neck (WRNR) |
|---|---|---|---|---|---|---|
| ½ | 1 | 1 | 2 | 1 | 2 | 2 |
| ¾ | 2 | 2 | 2 | 2 | 2 | 2 |
| 1 | 2 | 2 | 2 | 2 | 2 | 3 |
| 1¼ | 3 | 3 | 3 | 3 | 3 | 3 |
| 1½ | 3 | 3 | 3 | 3 | 4 | 4 |
| 2 | 5 | 5 | 5 | 5 | 5 | 6 |
| 2½ | 8 | 8 | 8 | 8 | 7 | 10 |
| 3 | 9 | 9 | 9 | 9 | 9 | 11.5 |
| 3½ | 11 | 12 | 11 | 11 | 13 | 12 |
| 4 | 13 | 13 | 13 | 13 | 17 | 16.5 |
| 5 | 15 | 15 | 15 | 15 | 20 | 21 |
| 6 | 19 | 19 | 19 | 19 | 27 | 26 |
| 8 | 30 | 30 | 30 | 30 | 47 | 42 |
| 10 | 43 | 43 | 43 | 43 | 70 | 54 |
| 12 | 64 | 64 | 64 | 64 | 123 | 88 |
| 14 | 90 | 90 | 90 | 105 | 140 | 114 |
| 16 | 106 | 98 | 98 | 140 | 180 | 140 |
| 18 | 130 | 130 | 130 | 160 | 220 | 165 |
| 20 | 165 | 165 | 165 | 195 | 285 | 197 |
| 22 | 185 | 185 | 185 | 245 | 355 | 225 |
| 24 | 220 | 220 | 220 | 275 | 430 | 268 |
Yes, we offer custom sizes for Mild Steel 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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