Specification support from Hyupshin
Use the dimensions and RFQ notes below to check the required standard, size range, pressure rating, material grade and certificate needs before sending an inquiry.
UNI detail
UNI 2283 PN25 Weld Neck Flanges
UNI 2283 PN25 weld neck flange dimensions.
EN 1092-1 focused
ASME B16.5 supported
PN-rated supply
Traceable documents
EN 1092-1Main product range
ANSI B16.5Class-rated American standard
PED / AD 2000 / UKCACertificate references
Importers & stockistsRepeat supply cooperation
European shipment markets
Flange supply support for European importers and distributors.
Hyupshin supports EN 1092-1, DIN, BS 4504, UNI and project-standard flange inquiries for buyers in United Kingdom, Germany, Hungary, Poland, Czech Republic, Croatia, Italy, Serbia, Slovakia, France, Norway, Portugal, Spain, Netherlands, Austria, Ireland, Albania, Bulgaria, Belgium, Greece.
RFQ preparation
Information that makes European standard flange quotation faster.
Standard
EN 1092-1, ANSI / ASME B16.5, DIN, BS 4504, UNI or project drawing.
Flange details
Type, DN size, PN rating, facing, bore and drawing notes.
Material
Carbon steel, low-temperature steel, stainless steel or project grade.
Documents
EN 10204 3.1, inspection, marking, packing and certificate needs.
Supply notes
UNI 2283 PN25 Weld Neck Flanges for European buyers
RFQ confirmation points
Please confirm standard number, flange type, nominal size, pressure rating, material grade, facing, quantity, certificate requirement and any project drawing before quotation.
Product scope
UNI 2283 PN25 weld neck flange can be quoted in carbon steel, stainless steel or project material grades when the order specification, dimensions and certificate requirements are confirmed.
European buyer focus
Order details to confirm before production
Weld Neck flange inquiries are reviewed against piping service, installation position and required facing.
State PN rating clearly, especially PN10, PN16, PN25 or PN40 for regular European distributor orders.
Common RFQs include carbon steel, low-temperature steel and stainless steel grades. Attach the project grade when it differs from regular stock items.
Confirm RF, FF, RTJ, galvanized finish, black paint, anti-rust oil or project-specific surface protection before quotation.
Mention EN 10204 3.1, PED, AD 2000, UKCA, PMI, NDT or third-party inspection requirements in the RFQ.
For European shipment, state pallet, wooden case, label, marking and mixed-size packing requirements early.
Procurement guidance
UNI 2283 PN25 Weld Neck Flanges quotation notes
UNI 2283 PN25 Weld Neck Flanges buying notes
UNI flange pages support Italian standard references used in distributor stock, maintenance work and regional European projects. Plate flanges under UNI 2276, 2277 and 2278 and weld neck flanges under UNI 2280-2284 should be quoted with the exact UNI number rather than only a general description.
Italian and nearby European buyers often care about dimensional matching, material certificate, finish and repeat availability. The RFQ should include the UNI series, DN size, PN rating, material and whether the flanges are for stock or a named project.
Weld Neck flange details
For weld neck flanges, the bore, pipe schedule, welding neck dimensions and pressure service should be stated clearly. These details affect machining and inspection, especially when the buyer needs WNRF, WNFF or RTJ execution.
For European buyers, the quotation is stronger when documentation requirements are stated at the beginning: EN 10204 3.1 certificate, PED or AD 2000 references, UKCA notes, third-party inspection, PMI, NDT, marking photos or packing photos. This avoids revising the price after the technical review.
How to prepare the RFQ
Hyupshin recommends sending the RFQ as a table when several sizes are involved. Separate each standard, type, pressure rating and material grade into its own line, then add quantity, destination port and required delivery time. This format is easier for European importers, distributors and project suppliers to compare and repeat in future orders.
If the order is urgent, mark which sizes are needed first and whether partial shipment is acceptable. For repeat distributors, previous purchase records or customer part numbers can be added to the message field so the specification can be matched more quickly.
Reference scope
Common order references
| Standard / Type | Product | Typical scope |
|---|---|---|
| UNI 2283 PN25 weld neck flange | Product type | Dimensions and specification tables below |
| Documents | Material certificate | EN 10204 3.1 by request |
| Order control | Drawing / standard edition | Confirm before production |
Product data
Dimensions and specification tables
ITALY STANDARD UNI 2283 PN25 WELDING NECK FLANGE RF DIMENSIONS TABLE
| Directions for the designation | d1 | a | b | D | f | h | h1 | m | r | s | Holes | Screws | Weight* | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rated Diameter | External diameter of the pipe | Kg | ||||||||||||
| 15 | 20 | 21 | 65 | 16 | 95 | 14 | 38 | 6 | 30 | 4 | 2,5 | 4 | M 12 | 0,83 |
| 21,3 | 22,5 | 32 | 0,83 | |||||||||||
| 20 | 25 | 26 | 75 | 18 | 105 | 14 | 40 | 6 | 38 | 4 | 2,5 | 4 | M 12 | 1,15 |
| 26,9 | 28 | 40 | 1,15 | |||||||||||
| 25 | 30 | 31 | 85 | 18 | 115 | 14 | 40 | 6 | 42 | 4 | 2,8 | 4 | M 12 | 1,39 |
| 33,7 | 34,5 | 46 | 1,38 | |||||||||||
| 32 | 38 | 39 | 100 | 18 | 140 | 18 | 42 | 6 | 52 | 6 | 3 | 4 | M 16 | 2,03 |
| 42,4 | 43,5 | 56 | 2,01 | |||||||||||
| 40 | 44,5 | 45,5 | 110 | 18 | 150 | 18 | 45 | 7 | 60 | 6 | 3 | 4 | M 16 | 2,35 |
| 48,3 | 49,5 | 64 | 2,33 | |||||||||||
| 50 | 57 | 58 | 125 | 20 | 165 | 18 | 48 | 8 | 72 | 6 | 3,5 | 4 | M 16 | 3,11 |
| 60,3 | 61,5 | 75 | 3.08 | |||||||||||
| 65 | 76,1 | 77 | 145 | 22 | 185 | 18 | 52 | 10 | 90 | 6 | 3,5 | 8 | M 16 | 3,95 |
| 80 | 88,9 | 90 | 160 | 24 | 200 | 18 | 58 | 12 | 105 | 8 | 3,7 | 8 | M 16 | 4,98 |
| 100 | 108 | 109 | 190 | 24 | 235 | 22 | 65 | 12 | 128 | 8 | 3,7 | 8 | M 20 | 6,85 |
| 114,3 | 115,5 | 134 | 6,70 | |||||||||||
| 125 | 133 | 134 | 220 | 26 | 270 | 25 | 68 | 12 | 155 | 8 | 4 | 8 | M 22 | 9,42 |
| 139,7 | 141 | 162 | 9,20 | |||||||||||
| 150 | 159 | 161 | 250 | 28 | 300 | 25 | 75 | 12 | 182 | 10 | 5 | 8 | M 22 | 12,4 |
| 168,3 | 170,5 | 192 | 12,0 | |||||||||||
| 175 | 193,7 | 195,5 | 280 | 28 | 330 | 25 | 75 | 15 | 218 | 10 | 5 | 12 | M 22 | 13,6 |
| 200 | 219,1 | 221 | 310 | 30 | 360 | 25 | 80 | 16 | 244 | 10 | 5 | 12 | M 22 | 16,8 |
| 250 | 267 | 269 | 370 | 32 | 425 | 30 | 88 | 18 | 292 | 12 | 5,5 | 12 | M 27 | 23,8 |
| 273 | 275 | 298 | 23,3 | |||||||||||
| 300 | 323,9 | 326 | 430 | 34 | 485 | 30 | 92 | 18 | 352 | 12 | 6 | 16 | M 27 | 30,5 |
| 350 | 355,6 | 357,5 | 490 | 38 | 555 | 33 | 100 | 20 | 398 | 12 | 6,4 | 16 | M 30 | 47,6 |
| 368 | 370 | 44,5 | ||||||||||||
| 400 | 406,4 | 408,5 | 550 | 40 | 620 | 36 | 110 | 20 | 452 | 12 | 7,3 | 16 | M 33 | 62,1 |
| 419 | 421 | 58,3 | ||||||||||||
| 450 | 457,2 | 459 | 600 | 40 | 670 | 36 | 115 | 20 | 492 | 12 | 8 | 20 | M 33 | 67,8 |
| 500 | 508 | 510 | 660 | 44 | 730 | 36 | 125 | 20 | 558 | 12 | 8 | 20 | M 33 | 88,8 |
| 600 | 609,6 | 611,5 | 770 | 46 | 845 | 39 | 125 | 20 | 660 | 12 | 8 | 20 | M 36 x 3 | 114 |
| 700 | 711,2 | 715 | 875 | 46 | 960 | 42 | 125 | 20 | 760 | 12 | 10 | 24 | M 39 x 3 | 138 |
| 800 | 812,8 | 817 | 990 | 50 | 1085 | 48 | 135 | 22 | 865 | 12 | 11 | 24 | M 45 x 3 | 185 |
| 900 | 914,4 | 918 | 1090 | 54 | 1185 | 48 | 145 | 24 | 968 | 12 | 12 | 28 | M 45 x 3 | 224 |
| 1000 | 1016 | 1020 | 1210 | 58 | 1320 | 56 | 155 | 24 | 1070 | 16 | 13 | 28 | M 52 x 3 | 293 |
| * | The weight is approximate and calculated on base 7.85 Kg/dm3 |
Use these tables for RFQ preparation. Final production should be confirmed against the required standard edition, drawing, material grade and certificate requirement.
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UNI 2283 PN25 Weld Neck Flanges RFQ support
Send the standard, DN size, PN rating, material grade, facing, quantity, certificate requirement and any project drawing. Hyupshin will check the specification before quotation.
RFQ preparation
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