Harsh Flanges, located in Mumbai, India, is a trusted manufacturer and supplier of top-notch Loose Flanges, often referred to as Lap Joint Flanges. These flanges are specifically designed to work with a stub end, making them perfect for piping systems that need to be taken apart frequently for inspection, cleaning, or replacement. We craft our loose flanges from a range of materials, including carbon steel, stainless steel, and alloy steel, all while adhering to international standards like ASME, ASTM, and DIN. At Harsh Flanges, we offer cost-effective and durable flange solutions that are widely utilized in industries such as chemical processing, petrochemicals, and water treatment.
Our Loose Flanges come in various material grades, including carbon steel (like A105), stainless steel (such as SS304/SS316), and alloy steel. The stainless steel options typically feature 18% Chromium and 8–10% Nickel, providing outstanding corrosion resistance. While the mechanical properties can vary based on the chosen material, they generally boast a tensile strength ranging from 400–700 MPa and a yield strength between 200–450 MPa. These flanges are known for their excellent ductility, good weldability, and the ability to handle moderate to high pressure. Their loose design minimizes flange stress and allows for easy rotational alignment, making them ideal for systems that require regular maintenance or reassembly.
| Size | 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, Class 300, Class 400, Class 600, Class 900, Class1500, Class 2500 |
| 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) |
| 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 |
| Material | Incoloy Loose Flange, Brass Loose Flange, SMO 254 Loose Flange, AISI 4130 Loose Flange, Alloy 20 Loose Flange, Stainless Steel Loose Flange, Duplex Steel Loose Flange, Copper Nickel Loose Flange, Titanium Loose Flange, Hastelloy Loose Flange, Inconel Loose Flange, Super Duplex Loose Flange, Monel Loose Flange, Nickel Alloy Loose Flange. |
| Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175 | |
Harsh Flanges, a leading supplier in Mumbai, India, offers an extensive selection of Loose 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.
Loose Flanges are commonly used in piping systems that need to be disassembled regularly for cleaning, inspection, or maintenance. You’ll find them in industries like water treatment, chemical processing, oil & gas, and food and beverage, where they excel in low-pressure applications that require easy access. When paired with stub ends, loose flanges provide flexibility in bolt alignment and help reduce installation stress. Their cost-effectiveness and reusability make them a great choice for non-critical piping systems that deal with corrosive or fluctuating flow conditions. Additionally, loose flanges are often favored in setups where the piping materials differ.
| Nominal Bore | Dia. (D) | Thick. (E) | Dia. (B) | Dia. (A) | Height (H) | Nbr | Holes | Dia. (C) |
|---|---|---|---|---|---|---|---|---|
| 1/2″ | 95 | 14.3 | 38 | 22.9 | 22 | 4 | 15.87 | 66.7 |
| 3/4″ | 115 | 15.9 | 48 | 28.2 | 25 | 4 | 19.05 | 82.6 |
| 1″ | 125 | 17.5 | 54 | 34.9 | 27 | 4 | 19.05 | 88.9 |
| 1 1/4″ | 135 | 19.1 | 64 | 43.7 | 27 | 4 | 19.05 | 98.4 |
| 1 1/2″ | 155 | 20.7 | 70 | 50.0 | 30 | 4 | 22.22 | 114.3 |
| 2″ | 165 | 22.3 | 84 | 62.5 | 33 | 8 | 19.05 | 127.0 |
| 2 1/2″ | 190 | 25.4 | 100 | 75.4 | 38 | 8 | 22.22 | 149.2 |
| 3″ | 210 | 28.6 | 117 | 91.4 | 43 | 8 | 22.22 | 168.3 |
| 3 1/2″ | 230 | 30.2 | 133 | 104.1 | 44 | 8 | 22.22 | 184.2 |
| 4″ | 255 | 31.8 | 146 | 116.8 | 48 | 8 | 22.22 | 200.0 |
| 5″ | 280 | 35.0 | 178 | 144.4 | 51 | 8 | 22.22 | 235.0 |
| 6″ | 320 | 36.6 | 206 | 171.4 | 52 | 12 | 22.22 | 269.9 |
| 8″ | 380 | 41.3 | 260 | 222.2 | 62 | 12 | 25.40 | 330.2 |
| 10″ | 445 | 47.7 | 321 | 277.4 | 95 | 16 | 28.57 | 387.4 |
| 12″ | 520 | 50.8 | 375 | 328.2 | 102 | 16 | 31.75 | 450.8 |
| 14″ | 585 | 54.0 | 425 | 360.2 | 111 | 20 | 31.75 | 514.4 |
| 16″ | 650 | 57.2 | 483 | 411.2 | 121 | 20 | 34.29 | 571.5 |
| 18″ | 710 | 60.4 | 533 | 462.3 | 130 | 24 | 34.29 | 628.6 |
| 20″ | 775 | 63.5 | 587 | 514.4 | 140 | 24 | 34.29 | 685.8 |
| 24″ | 915 | 69.9 | 702 | 616.0 | 152 | 24 | 41.27 | 812.8 |
| Pipe Size | 150 # | 300 # | 600 # | 900 # | 1500 # | 2500 # | ||||||||||||
| WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | |
| 1/2″ | 2 | 1 | 1 | 2 | 1 | 1 | 2 | 2 | 2 | SEE 1500 # WEIGHTS | 5 | 4 | 4 | 7 | 7 | 7 | ||
| 3/4″ | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 3 | 3 | SEE 1500 # WEIGHTS | 6 | 5 | 6 | 8 | 8 | 8 | ||
| 1″ | 3 | 2 | 2 | 4 | 3 | 3 | 4 | 4 | 4 | SEE 1500 # WEIGHTS | 9 | 8 | 8 | 12 | 11 | 11 | ||
| 1 1/2″ | 4 | 3 | 3 | 7 | 6 | 6 | 8 | 7 | 8 | SEE 1500 # WEIGHTS | 13 | 12 | 13 | 25 | 22 | 23 | ||
| 2″ | 6 | 5 | 5 | 9 | 7 | 8 | 12 | 9 | 10 | SEE 1500 # WEIGHTS | 25 | 25 | 25 | 42 | 37 | 39 | ||
| 2 1/2″ | 8 | 7 | 7 | 12 | 10 | 12 | 18 | 13 | 15 | SEE 1500 # WEIGHTS | 36 | 36 | 35 | 52 | 55 | 56 | ||
| 3″ | 10 | 8 | 9 | 15 | 13 | 16 | 23 | 16 | 20 | 31 | 26 | 29 | 48 | 48 | 48 | 94 | 83 | 86 |
| 4″ | 15 | 13 | 17 | 25 | 22 | 27 | 42 | 37 | 41 | 53 | 53 | 54 | 73 | 73 | 73 | 145 | 125 | 130 |
| 5″ | 19 | 15 | 20 | 32 | 28 | 35 | 68 | 63 | 68 | 86 | 83 | 87 | 130 | 130 | 140 | 245 | 210 | 225 |
| 6″ | 24 | 19 | 26 | 42 | 39 | 50 | 81 | 80 | 86 | 110 | 110 | 115 | 165 | 165 | 160 | 380 | 325 | 345 |
| 8″ | 39 | 30 | 45 | 67 | 58 | 81 | 120 | 115 | 140 | 175 | 170 | 200 | 275 | 260 | 300 | 580 | 485 | 530 |
| 10″ | 52 | 43 | 70 | 91 | 81 | 124 | 190 | 170 | 230 | 260 | 245 | 290 | 455 | 435 | 510 | 1075 | 930 | 1025 |
| 12″ | 80 | 64 | 110 | 140 | 115 | 185 | 225 | 200 | 295 | 325 | 325 | 415 | 690 | 580 | 690 | 1525 | 1100 | 1300 |
| 14″ | 110 | 90 | 140 | 180 | 165 | 250 | 280 | 230 | 355 | 400 | 400 | 520 | 940 | NA | 975 | NA | NA | NA |
| 16″ | 140 | 98 | 180 | 250 | 190 | 295 | 390 | 330 | 495 | 495 | 425 | 600 | 1250 | NA | 1300 | NA | NA | NA |
| 18″ | 150 | 130 | 220 | 320 | 250 | 395 | 475 | 400 | 630 | 680 | 600 | 850 | 1625 | NA | 1750 | NA | NA | NA |
| 20″ | 180 | 165 | 285 | 400 | 315 | 505 | 590 | 510 | 810 | 830 | 730 | 1075 | 2050 | NA | 2225 | NA | NA | NA |
| 22″ | 225 | 185 | 355 | 465 | 370 | 640 | 720 | 590 | 1000 | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 24″ | 260 | 220 | 430 | 580 | 475 | 790 | 830 | 730 | 1250 | 1500 | 1400 | 2025 | 3325 | NA | 3625 | NA | NA | NA |
Yes, we offer custom sizes for Loose Flanges to meet specific project needs. Our team at Harsh Flanges is committed to providing tailored solutions for all your requirements. For more details, contact us at sales@harshflanges.co.in.
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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