Blind flanges – EN 1092-1 Type 05 and ASME B16.5
Blind flanges close the end of a pipeline, valve or nozzle. We manufacture them to EN 1092-1 Type 05 (DIN 2527), ASME B16.5 / B16.47, JIS B2220 and AWWA C207, from PN 2.5 to PN 100 and Class 150 to 2500, in carbon and stainless steel.
Technical summary
- Standards
- EN 1092-1 Type 05 (DIN 2527), ASME B16.5 / B16.47, JIS B2220, AWWA C207
- Pressure class
- PN 2.5 – PN 100 · Class 150 – 2500
- Size range
- DN 10 – 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
- Closing pipeline ends
- Blanking during hydrostatic pressure tests
- Temporary closure of lines to be extended
- Closing tank, column and boiler nozzles
Selection notes
- Blind flanges are heavier than other flanges of the same size and class
- Can be supplied with a threaded or welded centre hole as a reducing blind flange
- For temporary line isolation a spectacle blind may be more practical
Dimensions and weights
PN16 blind flanges · EN 1092-1 Type 05
| Size | OD D (mm) | Bolt circle K (mm) | Holes | Thickness (mm) | Weight (kg) | Bolts |
|---|---|---|---|---|---|---|
| DN15 | 95 | 65 | 4 × Ø14 | 16 | 0.6 | M12 |
| DN20 | 105 | 75 | 4 × Ø14 | 18 | 0.9 | M12 |
| DN25 | 115 | 85 | 4 × Ø14 | 18 | 1.1 | M12 |
| DN32 | 140 | 100 | 4 × Ø18 | 18 | 1.8 | M16 |
| DN40 | 150 | 110 | 4 × Ø18 | 18 | 2.1 | M16 |
| DN50 | 165 | 125 | 4 × Ø18 | 18 | 2.9 | M16 |
| DN65 | 185 | 145 | 4 × Ø18 | 18 | 3.7 | M16 |
| DN80 | 200 | 160 | 8 × Ø18 | 20 | 4.6 | M16 |
| DN100 | 220 | 180 | 8 × Ø18 | 20 | 5.6 | M16 |
| DN125 | 250 | 210 | 8 × Ø18 | 22 | 8.1 | M16 |
| DN150 | 285 | 240 | 8 × Ø22 | 22 | 10.5 | M20 |
| DN200 | 340 | 295 | 12 × Ø22 | 24 | 16.2 | M20 |
| DN250 | 405 | 355 | 12 × Ø26 | 26 | 25.0 | M24 |
| DN300 | 460 | 410 | 12 × Ø26 | 28 | 35.1 | M24 |
Class 150 blind 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 | 0.42 | 1/2" |
| 3/4" | 98 | 69.8 | 4 × Ø15.9 | 12.7 | 0.61 | 1/2" |
| 1" | 108 | 79.4 | 4 × Ø15.9 | 14.3 | 0.86 | 1/2" |
| 1¼" | 117 | 88.9 | 4 × Ø15.9 | 15.9 | 1.16 | 1/2" |
| 1½" | 127 | 98.4 | 4 × Ø15.9 | 17.5 | 1.54 | 1/2" |
| 2" | 152 | 120.6 | 4 × Ø19 | 19.0 | 2.41 | 5/8" |
| 2½" | 178 | 139.7 | 4 × Ø19 | 22.2 | 3.95 | 5/8" |
| 3" | 190 | 152.4 | 4 × Ø19 | 23.8 | 4.91 | 5/8" |
| 4" | 229 | 190.5 | 8 × Ø19 | 23.8 | 7.03 | 5/8" |
| 5" | 254 | 215.9 | 8 × Ø22.2 | 23.8 | 8.64 | 3/4" |
| 6" | 279 | 241.3 | 8 × Ø22.2 | 25.4 | 11.3 | 3/4" |
| 8" | 343 | 298.4 | 8 × Ø22.2 | 28.6 | 19.7 | 3/4" |
| 10" | 406 | 362.0 | 12 × Ø25.4 | 30.2 | 28.8 | 7/8" |
| 12" | 483 | 431.8 | 12 × Ø25.4 | 31.8 | 43.8 | 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 blind flange used for?
A blind flange has no bore and closes the end of a pipeline, valve or vessel nozzle. It is used at line ends, for blanking during pressure tests and for lines that will be extended later.
Why is a blind flange heavier than other flanges?
It has no centre hole, so it contains more steel for the same diameter and thickness; in larger sizes it is also made thicker to withstand the pressure.
What is the difference between a blind flange, a cap and a plug?
A blind flange is a bolted closure that can be removed. A cap is welded permanently to the pipe end. A plug closes small threaded ends.
How much does a DN100 PN16 blind flange weigh?
About 5.6 kg (catalogue value). It has an outside diameter of 220 mm, a bolt circle of 180 mm and 8 holes for M16 bolts.