ASME B16.5 Class 900 Long Weld Neck Flanges are robust piping components designed for high-pressure and high-temperature applications where maximum strength and leak-proof performance are critical. Also known as LWNRF #900 (Long Weld Neck Raised Face), LWNFF #900 (Long Weld Neck Flat Face), and LWN Flanges #900, these flanges feature an extended neck that ensures smooth stress distribution at the weld joint, reducing fatigue and increasing the lifespan of the piping system. At Tesco Steel & Engineering, we manufacture these flanges with precision and high-quality materials, meeting all ASME B16.5 standards for durability and reliability.
Our Class 900 LWN flanges are widely used in industries such as oil & gas, petrochemicals, chemical processing, shipbuilding, and power generation, where dependable piping solutions are essential. We proudly export our flanges to countries including the USA, UK, Germany, Italy, Saudi Arabia, UAE, and Oman, serving Western and Middle Eastern markets with products that maintain consistent quality and performance even under extreme conditions. These flanges are particularly suitable for critical projects where long-term safety and operational efficiency are paramount.
Produced at our state-of-the-art Mumbai factory, our long weld neck flanges are manufactured using advanced CNC machinery, automated forging systems, and stringent quality control processes. Tesco Steel & Engineering is renowned for its superior quality manufacturing, delivering flanges that are corrosion-resistant, dimensionally precise, and capable of withstanding high pressures and temperatures. With a commitment to global standards, innovation, and customer satisfaction, we continue to be a trusted supplier of ASME B16.5 Class 900 LWN Flanges across multiple industries and international markets.
| Size in Inch | Size in mm | Outer Dia. | Flange Thick. | Hub OD | Weld Neck OD | RF Dia. | RF Height | PCD | Hub Length | No of Bolts | Bolt Size UNC | RF Stud Length | Hole Size | ISO Stud Size |
| A | B | C | D | E | F | G | H | |||||||
| 1/2 | 15 | 120 | 22.3 | 38 | 21.3 | 34.9 | 7 | 82.6 | As Required | 4 | 3/4 | 110 | 7/8 | M20 |
| 3/4 | 20 | 130 | 25.4 | 44 | 26.7 | 42.9 | 7 | 88.9 | As Required | 4 | 3/4 | 115 | 7/8 | M20 |
| 1 | 25 | 150 | 28.6 | 52 | 33.4 | 50.8 | 7 | 101.6 | As Required | 4 | 7/8 | 125 | 1 | M24 |
| 1 1/4 | 32 | 160 | 28.6 | 64 | 42.2 | 63.5 | 7 | 111.1 | As Required | 4 | 7/8 | 125 | 1 | M24 |
| 1 1/2 | 40 | 180 | 31.8 | 70 | 48.3 | 73 | 7 | 123.8 | As Required | 4 | 1 | 140 | 1 1/8 | M27 |
| 2 | 50 | 215 | 38.1 | 105 | 60.3 | 92.1 | 7 | 165.1 | As Required | 8 | 7/8 | 145 | 1 | M24 |
| 2 1/2 | 65 | 245 | 41.3 | 124 | 73 | 104.8 | 7 | 190.5 | As Required | 8 | 1 | 160 | 1 1/8 | M27 |
| 3 | 80 | 240 | 38.1 | 127 | 88.9 | 127 | 7 | 190.5 | As Required | 8 | 7/8 | 145 | 1 | M24 |
| 4 | 100 | 290 | 44.5 | 159 | 114.3 | 157.2 | 7 | 235 | As Required | 8 | 1 1/8 | 170 | 1 1/4 | M30 |
| 5 | 125 | 350 | 50.8 | 190 | 141.3 | 185.7 | 7 | 279.4 | As Required | 8 | 1 1/4 | 190 | 1 3/8 | M33 |
| 6 | 150 | 380 | 55.6 | 235 | 168.3 | 215.9 | 7 | 317.5 | As Required | 12 | 1 1/8 | 190 | 1 1/4 | M30 |
| 8 | 200 | 470 | 63.5 | 298 | 219.1 | 269.9 | 7 | 393.7 | As Required | 12 | 1 3/8 | 220 | 1 1/2 | M36 |
| 10 | 250 | 545 | 69.9 | 368 | 273 | 323.8 | 7 | 469.9 | As Required | 16 | 1 3/8 | 235 | 1 1/2 | M36 |
| 12 | 300 | 610 | 79.4 | 419 | 323.8 | 381 | 7 | 533.4 | As Required | 20 | 1 3/8 | 255 | 1 1/2 | M36 |
| 14 | 350 | 640 | 85.8 | 451 | 355.6 | 412.8 | 7 | 558.8 | As Required | 20 | 1 1/2 | 275 | 1 5/8 | M39 |
| 16 | 400 | 705 | 88.9 | 508 | 406.4 | 469.9 | 7 | 616 | As Required | 20 | 1 5/8 | 285 | 1 3/4 | M42 |
| 18 | 450 | 785 | 101.6 | 565 | 457 | 533.4 | 7 | 685.8 | As Required | 20 | 1 7/8 | 325 | 2 | M48 |
| 20 | 500 | 855 | 108 | 622 | 508 | 584.2 | 7 | 749.3 | As Required | 20 | 2 | 350 | 2 1/8 | M52 |
| 24 | 600 | 1040 | 139.7 | 749 | 610 | 692.2 | 7 | 901.7 | As Required | 20 | 2 1/2 | 440 | 2 5/8 | M64 |
Countries we export to: ASME B16.5 Class 900 Long Weld Neck Flanges Manufacturers / Suppliers / Stockist in Kuwait, in UAE, in Germany, Saudi Arabia, West Africa, Iraq, Congo, Mexico, Bahra, Canada, Philippes, Thailand, Kenya, Oman, Malaysia, Turkey, Qatar, Sudan, Netherlands, Oman, Nigeria, Lithuania, Gabon, Russia, Vietnam, Angola, Bolivia, Indonesia, UK, Yemen, Italy, United States, Venezuela, Spain, Iran, Estonia, Kazakhstan, Algeria, Jordan, Ecuador, Portugal, Colombia, Libya, Chile, Peru, Iran, South Africa, Bangkok, Namibia, Jeddah, Afghanistan, Israel, Zambia, Macau, Morocco, Denmark, Taiwan, Norway, Belarus, North Macedonia, Lebanon, Sri Lanka, Bhutan, Bulgaria, Albania, Ukrae, Belgium, Fland, Slovokia, Tibet, Romania, France, Brazil, Tridad & Tobago, Fiji, Tunisia, Gambia, Mexico, Hungary, Zimbabwe, Mongolia, Ghana, Egypt, Kazakhstan, Czech Republic, Azerbaijan, Poland, Greece, Costa Rica, Kosovo, New Zealand, Croatia, Puerto Rico, Tanzania, Somalia.
Major Exporting Areas: ANSI B16.5 #900 LWNRF Flanges Manufacturers / Suppliers / Stockist in Moscow, Port-Of-Spain, Seoul, Montreal, Dubai, Kuala Lumpur, Aberdeen, Tehran, Bogota, Petaling Jaya, Melbourne, Abu Dhabi, Courbevoie, Edmonton, Ho Chi Minh City, Bangkok, Toronto, Muscat, Milan, Busan, Mexico City, Perth, La Victoria, Santiago, Rio de Janeiro, London, Karachi, Los Angeles, Manama, Geoje-si, Atyrau, Sydney, Riyadh, New York, Jeddah, Houston, Granada, Jakarta, Brisbane, Algiers, Kuwait City, Dubai, Hanoi, Doha, Al Jubail, Chiyoda, Cairo, Gimhae-si, Caracas, Lagos, Al Khobar, Madrid, Singapore, Calgary, Colombo, Ulsan, Istanbul, Ahvaz, Dammam, Dallas, Texas, Ankara, Sharjah, Vung Tau, Angola, Benin, Burundi, Botswana, Burkina Faso, Cameroon, Douala, Central African Republic, Republic of Congo, Democratic Republic of Congo, Côte d'Ivoire, Djibouti, Eritrea, Ethiopia, Equatorial Guinea, Gabon, Guinea, Kenya, Liberia,Malawi, Mali, Mauritania, Mauritius, Casablanca-Settat, Tanger-Tetouan-Al Hoceima, Fès-Meknès, Marrakesh-Safi, Oriental, Béni Mellal-Khénifra, Souss-Massa, Laâyoune-Sakia El Hamra, Rabat-Salé-Kénitra region, Mozambique, Temara, Niger, Rwanda, Senegal, Sierra Leone, Sudan, Tanzania, Togo, Uganda, Bangkok, Bangchan, Khlong Sam Wa, Gemopolis, Lard Krabang, Pathumthani, Bangkadi, Navanakorn, Samut Prakarn, Bangplee, Bangpoo, Saraburi, Nongkhae, SIL I/Land, Chachoengsao, 304 I/P, Gateway City, Wellgrow, Rayong, Amata City, Eastern Seaboard, Hemaraj Eastern Seaboard, Rojana, Soam Eastern, Chonburi, Amata Nakorn, Hemaraj Chonburi, Pinthong, Ayutthaya, Bangpa-in, Saha Ratna Nakorn, Nakornratchasima, Kabinburi, Prachinburi, HCMC, Tan Thuan Export Processing Zone, Bien Hoa, Dong Nai Province, Amata City Bien Hoa Industrial Park, Long Binh Techno Park, Binh Duong Province, Vietnam Singapore Industrial Park, My Phuoc Industrial Park, Ho Nai Industrial Zone, Bau Xeo Industrial Park, Long Thanh Industrial Zone, Long Duc Industrial Park, Duc Hao I, Tan Huong, Long Jiang, Tra Noc I/II, Hung Phu I, Hiep Phuoc Industrial Park, Phuoc Dong Industrial Park, Dinh Vu – Cat Hai Economic Zone.