Weld neck flanges (WN) – EN 1092-1 Type 11 and ASME B16.5
We manufacture weld neck flanges to EN 1092-1 Type 11 and ASME B16.5 / B16.47 in our own factory in Istanbul, Turkey, from DN 15 to DN 2000 (1/2" – 60") and PN 6 – PN 400 / Class 150 – 2500. The tapered hub is butt-welded to the pipe, making weld neck flanges the right choice for high pressure, high temperature and vibrating lines.
Technical summary
- Standards
- EN 1092-1 Type 11 (DIN 2631 – 2638), ASME B16.5, ASME B16.47
- Pressure class
- PN 6 – PN 400 · Class 150 – 2500
- Size range
- DN 15 – DN 2000 · 1/2" – 60"
- Materials
- Carbon steel S235JR, P245GH / P250GH, ASTM A105 / A105N; stainless 304, 304L, 316, 316L, 316Ti, 321
- Facing
- RF, FF or RTJ
- Coating
- Black (oiled), hot-dip galvanized or painted
- Certificate
- EN 10204 3.1 material certificate on request
Typical applications
- Steam, hot water and thermal oil lines
- Refineries, petrochemical and natural gas plants
- Power plants and high-pressure pump discharge
- Any line with temperature changes or vibration
Selection notes
- The bore is machined to the pipe wall thickness – state pipe OD and wall or schedule (e.g. 114.3 × 6.02 mm or SCH 40)
- Full-penetration butt weld, suitable for radiographic (RT) inspection
- Choose the pressure class for the operating temperature: allowable pressure falls as temperature rises
Dimensions and weights
PN16 weld neck flanges · EN 1092-1 Type 11
| Size | OD D (mm) | Bolt circle K (mm) | Holes | Thickness (mm) | Weight (kg) | Bolts |
|---|---|---|---|---|---|---|
| DN15 | 95 | 65 | 4 × Ø14 | 16 | 0.77 | M12 |
| DN20 | 105 | 75 | 4 × Ø14 | 18 | 1.09 | M12 |
| DN25 | 115 | 85 | 4 × Ø14 | 18 | 1.31 | M12 |
| DN32 | 140 | 100 | 4 × Ø18 | 18 | 1.89 | M16 |
| DN40 | 150 | 110 | 4 × Ø18 | 18 | 2.13 | M16 |
| DN50 | 165 | 125 | 4 × Ø18 | 18 | 2.53 | M16 |
| DN65 | 185 | 145 | 8 × Ø18 | 18 | 3.02 | M16 |
| DN80 | 200 | 160 | 8 × Ø18 | 20 | 3.93 | M16 |
| DN100 | 220 | 180 | 8 × Ø18 | 20 | 4.57 | M16 |
| DN125 | 250 | 210 | 8 × Ø18 | 22 | 6.25 | M16 |
| DN150 | 285 | 240 | 8 × Ø22 | 22 | 7.62 | M20 |
| DN200 | 340 | 295 | 12 × Ø22 | 24 | 11.3 | M20 |
| DN250 | 405 | 355 | 12 × Ø26 | 26 | 16.4 | M24 |
| DN300 | 460 | 410 | 12 × Ø26 | 28 | 21.9 | M24 |
Class 150 weld neck flanges · ASME B16.5
| Size | OD (mm) | Bolt circle (mm) | Holes | Thickness (mm) | Weight (kg) | Bolts |
|---|---|---|---|---|---|---|
| 1/2" | 89 | 60.3 | 4 × Ø15.9 | 11.1 | 0.5 | 1/2" |
| 3/4" | 98 | 69.8 | 4 × Ø15.9 | 12.7 | 0.7 | 1/2" |
| 1" | 108 | 79.4 | 4 × Ø15.9 | 14.3 | 1.1 | 1/2" |
| 1¼" | 117 | 88.9 | 4 × Ø15.9 | 15.9 | 1.5 | 1/2" |
| 1½" | 127 | 98.4 | 4 × Ø15.9 | 17.5 | 1.8 | 1/2" |
| 2" | 152 | 120.6 | 4 × Ø19 | 19.0 | 2.7 | 5/8" |
| 2½" | 178 | 139.7 | 4 × Ø19 | 22.2 | 4.4 | 5/8" |
| 3" | 190 | 152.4 | 4 × Ø19 | 23.8 | 5.2 | 5/8" |
| 4" | 229 | 190.5 | 8 × Ø19 | 23.8 | 7.5 | 5/8" |
| 5" | 254 | 215.9 | 8 × Ø22.2 | 23.8 | 9.2 | 3/4" |
| 6" | 279 | 241.3 | 8 × Ø22.2 | 25.4 | 11.0 | 3/4" |
| 8" | 343 | 298.4 | 8 × Ø22.2 | 28.6 | 18.3 | 3/4" |
| 10" | 406 | 362.0 | 12 × Ø25.4 | 30.2 | 25.0 | 7/8" |
| 12" | 483 | 431.8 | 12 × Ø25.4 | 31.8 | 39.0 | 7/8" |
All dimensions in mm; weights are catalogue values (±5%). Click a size for bolting data and stud lengths. Approximate USD prices are on the flange dimensions page. Larger sizes and other pressure classes are made to order.
Why Yazıcı Endüstri?
We have manufactured flanges and pipe fittings in our own factory in Esenyurt, Istanbul since 1998. Plasma cutting, CNC turning and drilling, welding and inspection are all done under one roof, so we control lead time and quality without middlemen.
Export and shipping
- Quotations in USD or EUR, usually within the working day
- Seaworthy packing on pallets or in wooden crates
- EN 10204 3.1 material certificates and marking on each flange
- Shipments by road, sea and air from Istanbul
What to include in your enquiry
- Standard (EN 1092-1 or ASME B16.5) and pressure class (PN or Class)
- Size (DN or inch) and quantity
- Material grade and face type (RF, FF, RTJ)
- Certificate and coating requirements, if any
Frequently asked questions
What is a weld neck flange?
A weld neck (WN) flange has a long tapered hub that is butt-welded to the pipe. The hub spreads stress from the flange into the pipe, which makes it the safest flange type for high pressure, high temperature and lines with vibration or thermal cycling.
What is the difference between a weld neck and a plate (slip-on) flange?
A weld neck flange is butt-welded through its tapered hub and suits high pressure and temperature. A plate or slip-on flange slides over the pipe and is fillet-welded inside and outside; it is cheaper and used on low to medium pressure lines.
How much does a DN100 PN16 weld neck flange weigh?
About 4.57 kg (catalogue value). It has an outside diameter of 220 mm, a bolt circle of 180 mm and 8 holes for M16 bolts.
What do I need to specify when ordering weld neck flanges?
Standard (EN 1092-1 or ASME B16.5), pressure class (PN or Class), size (DN or inch), face type (RF, FF or RTJ), material, pipe wall thickness or schedule for the bore, quantity and any certificate requirement such as EN 10204 3.1.