Pressure service checks
For Class 400 and 600 orders, buyers should provide pipe schedule or bore details, facing and inspection requirements clearly.
B16.5 class range
ANSI / ASME B16.5 Class 400 / 600 Flanges
Class 400 and 600 B16.5 flanges require more careful review of flange type, facing, bore, material and certificate requirements before quotation.
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.
Focused pages
Related European flange pages
ASME B16.5 Plate Flange
Plate / ring flange RF or FF inquiries for Class 150, 300 and 600 orders.
ASME B16.5 Weld Neck FlangeWNRF, WNFF and RTJ weld neck flange RFQs for pressure piping projects.
ASME B16.5 Slip On FlangeSORF and SOFF slip-on flange references for European buyers ordering American standard flanges.
ASME B16.5 Blind FlangeBlind / blank flange supply with RF, FF or RTJ facing requirements.
ASME B16.5 Class 150 / 300Common Class 150 and Class 300 quotation range.
ASME B16.5 MaterialsASTM A105, A350 LF2, A182 stainless steel and certificate notes.
Supply notes
ANSI / ASME B16.5 Class 400 / 600 Flanges for European buyers
Materials
ASTM A105 / A105N, A350 LF2 and A182 stainless steel materials can be reviewed according to project conditions.
European buyer focus
Order details to confirm before production
ANSI / ASME B16.5 flange inquiries are reviewed by standard, pressure rating and project use.
State Class 150, 300, 400, 600, 900, 1500 or 2500 with facing and bore details.
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
ANSI / ASME B16.5 Class 400 / 600 Flanges quotation notes
ANSI / ASME B16.5 Class 400 / 600 Flanges buying notes
ANSI / ASME B16.5 flanges purchased by European customers should be checked by NPS size, Class rating, flange facing, pipe schedule and bore requirement. These orders often appear in oil, gas, chemical, energy and EPC projects where American standard flanges are purchased together with EN or DIN items.
For Class 150 and Class 300 inquiries, buyers usually focus on fast comparison and clear material options. For Class 600, 900, 1500 and 2500, the RFQ should be treated as a project review with closer attention to facing, wall thickness, pressure service, inspection and certificate wording.
Flange detail review
For this flange type, the safest quotation route is to send the standard, size range, pressure rating, material grade, facing, quantity and any drawing notes together in one RFQ. This gives the sales and technical team enough information to check the order before pricing.
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 |
|---|---|---|
| Class 400 | Project-based demand | Confirm type and facing |
| Class 600 | Pressure piping demand | Bore / schedule confirmation recommended |
Product data
Dimensions and specification tables
ANSI / ASME B16.5 Class 600 weld neck flange RF dimensions
| NPS | OD D mm | Thickness b mm | Raised face g mm | Bolt circle k mm | Holes | Hole dia. l mm | Approx. kg |
|---|---|---|---|---|---|---|---|
| 1/2" | 95.2 | 14.3 | 34.9 | 66.7 | 4 | 15.9 | 0.900 |
| 3/4" | 117.5 | 15.9 | 42.9 | 82.5 | 4 | 19.0 | 1.500 |
| 1" | 123.8 | 17.5 | 50.8 | 88.9 | 4 | 19.0 | 1.900 |
| 1 1/4" | 133.3 | 20.6 | 63.5 | 98.4 | 4 | 19.0 | 2.600 |
| 1 1/2" | 155.6 | 22.2 | 73.0 | 114.3 | 4 | 22.2 | 3.300 |
| 2" | 165.1 | 25.4 | 92.1 | 127.0 | 8 | 19.0 | 4.700 |
| 2 1/2" | 190.5 | 28.6 | 104.8 | 149.2 | 8 | 22.2 | 6.500 |
| 3" | 209.5 | 31.7 | 127.0 | 168.3 | 8 | 22.2 | 8.700 |
| 3 1/2" | 228.6 | 34.9 | 139.7 | 184.1 | 8 | 25.4 | 11.200 |
| 4" | 273.0 | 38.1 | 157.2 | 215.9 | 8 | 25.4 | 18.100 |
| 5" | 330.2 | 44.4 | 185.7 | 266.7 | 8 | 28.6 | 30.500 |
| 6" | 355.6 | 47.6 | 215.9 | 292.1 | 12 | 28.6 | 36.200 |
| 8" | 419.1 | 55.6 | 269.9 | 349.2 | 12 | 31.7 | 56.500 |
| 10" | 508.0 | 63.5 | 323.8 | 431.8 | 16 | 34.9 | 91.000 |
| 12" | 558.8 | 66.7 | 381.0 | 488.9 | 20 | 34.9 | 105.000 |
| 14" | 603.2 | 69.8 | 412.7 | 527.0 | 20 | 38.1 | 125.000 |
| 16" | 685.8 | 76.2 | 469.9 | 603.2 | 20 | 41.3 | 178.000 |
| 18" | 742.9 | 82.5 | 533.4 | 654.0 | 20 | 44.4 | 261.000 |
| 20" | 812.8 | 88.9 | 584.2 | 723.9 | 24 | 44.4 | 268.000 |
| 22" | 869.9 | 95.2 | 641.2 | 777.9 | 24 | 47.6 | 328.000 |
| 24" | 939.8 | 101.6 | 692.1 | 838.2 | 24 | 50.8 | 380.000 |
ANSI / ASME B16.5 Class 600 plate flange RF dimensions
| NPS | OD D mm | Thickness b mm | Raised face g mm | Bolt circle k mm | Holes | Hole dia. l mm | Approx. kg |
|---|---|---|---|---|---|---|---|
| 1/2" | 95.2 | 14.3 | 34.9 | 66.7 | 4 | 15.9 | 0.800 |
| 3/4" | 117.5 | 15.9 | 42.9 | 82.5 | 4 | 19.0 | 1.400 |
| 1" | 123.8 | 17.5 | 50.8 | 88.9 | 4 | 19.0 | 1.600 |
| 1 1/2" | 155.6 | 22.2 | 73.0 | 114.3 | 4 | 22.2 | 3.100 |
| 2" | 165.1 | 25.4 | 92.1 | 127.0 | 8 | 19.0 | 3.700 |
| 3" | 209.5 | 31.7 | 127.0 | 168.3 | 8 | 22.2 | 7.300 |
| 4" | 273.0 | 38.1 | 157.2 | 215.9 | 8 | 25.4 | 11.800 |
| 6" | 355.6 | 47.6 | 215.9 | 292.1 | 12 | 28.6 | 29.500 |
| 8" | 419.1 | 55.6 | 269.9 | 349.2 | 12 | 31.7 | 43.000 |
| 10" | 508.0 | 63.5 | 323.8 | 431.8 | 16 | 34.9 | 70.000 |
| 12" | 558.8 | 66.7 | 381.0 | 488.9 | 20 | 34.9 | 86.000 |
| 16" | 685.8 | 76.2 | 469.9 | 603.2 | 20 | 41.3 | 142.000 |
| 20" | 812.8 | 88.9 | 584.2 | 723.9 | 24 | 44.4 | 232.000 |
| 24" | 939.8 | 101.6 | 692.1 | 838.2 | 24 | 50.8 | 330.000 |
ANSI / ASME B16.5 Class 600 slip on flange RF / FF dimensions
| NPS | OD D mm | Thickness b mm | Raised face g mm | Bolt circle k mm | Holes | Hole dia. l mm | Approx. kg |
|---|---|---|---|---|---|---|---|
| 1/2" | 95.2 | 14.3 | 34.9 | 66.7 | 4 | 15.9 | 0.800 |
| 3/4" | 117.5 | 15.9 | 42.9 | 82.5 | 4 | 19.0 | 1.400 |
| 1" | 123.8 | 17.5 | 50.8 | 88.9 | 4 | 19.0 | 1.600 |
| 1 1/2" | 155.6 | 22.2 | 73.0 | 114.3 | 4 | 22.2 | 3.100 |
| 2" | 165.1 | 25.4 | 92.1 | 127.0 | 8 | 19.0 | 3.700 |
| 3" | 209.5 | 31.7 | 127.0 | 168.3 | 8 | 22.2 | 7.300 |
| 4" | 273.0 | 38.1 | 157.2 | 215.9 | 8 | 25.4 | 11.800 |
| 6" | 355.6 | 47.6 | 215.9 | 292.1 | 12 | 28.6 | 29.500 |
| 8" | 419.1 | 55.6 | 269.9 | 349.2 | 12 | 31.7 | 43.000 |
| 10" | 508.0 | 63.5 | 323.8 | 431.8 | 16 | 34.9 | 70.000 |
| 12" | 558.8 | 66.7 | 381.0 | 488.9 | 20 | 34.9 | 86.000 |
| 16" | 685.8 | 76.2 | 469.9 | 603.2 | 20 | 41.3 | 142.000 |
| 20" | 812.8 | 88.9 | 584.2 | 723.9 | 24 | 44.4 | 232.000 |
| 24" | 939.8 | 101.6 | 692.1 | 838.2 | 24 | 50.8 | 330.000 |
ANSI / ASME B16.5 Class 600 blind flange dimensions
| NPS | OD D mm | Thickness b mm | Raised face g mm | Bolt circle k mm | Holes | Hole dia. l mm | Approx. kg |
|---|---|---|---|---|---|---|---|
| 1/2" | 95.2 | 14.3 | 34.9 | 66.7 | 4 | 15.9 | 0.700 |
| 3/4" | 117.5 | 15.9 | 42.9 | 82.5 | 4 | 19.0 | 1.200 |
| 1" | 123.8 | 17.5 | 50.8 | 88.9 | 4 | 19.0 | 1.500 |
| 1 1/2" | 155.6 | 22.2 | 73.0 | 114.3 | 4 | 22.2 | 3.200 |
| 2" | 165.1 | 25.4 | 92.1 | 127.0 | 8 | 19.0 | 4.300 |
| 3" | 209.5 | 31.7 | 127.0 | 168.3 | 8 | 22.2 | 8.000 |
| 4" | 273.0 | 38.1 | 157.2 | 215.9 | 8 | 25.4 | 18.000 |
| 6" | 355.6 | 47.6 | 215.9 | 292.1 | 12 | 28.6 | 35.500 |
| 8" | 419.1 | 55.6 | 269.9 | 349.2 | 12 | 31.7 | 58.000 |
| 10" | 508.0 | 63.5 | 323.8 | 431.8 | 16 | 34.9 | 98.000 |
| 12" | 558.8 | 66.7 | 381.0 | 488.9 | 20 | 34.9 | 125.000 |
| 16" | 685.8 | 76.2 | 469.9 | 603.2 | 20 | 41.3 | 215.000 |
| 20" | 812.8 | 88.9 | 584.2 | 723.9 | 24 | 44.4 | 366.000 |
| 24" | 939.8 | 101.6 | 692.1 | 838.2 | 24 | 50.8 | 532.000 |
ANSI / ASME B16.5 Class 600 socket weld flange RF dimensions
| NPS | OD in | Thickness in | Bolt circle in | Holes | Hole dia. in | Approx. lb |
|---|---|---|---|---|---|---|
| 1/2" | 3.75 | 0.56 | 2.62 | 4 | 0.62 | 2 |
| 3/4" | 4.62 | 0.62 | 3.25 | 4 | 0.75 | 3 |
| 1" | 4.88 | 0.69 | 3.5 | 4 | 0.75 | 4 |
| 1 1/2" | 6.12 | 0.88 | 4.5 | 4 | 0.88 | 7 |
| 2" | 6.5 | 1 | 5 | 8 | 0.75 | 9 |
| 3" | 8.25 | 1.25 | 6.62 | 8 | 0.88 | 16 |
| 4" | 10.75 | 1.5 | 8.5 | 8 | 1 | 37 |
| 6" | 14 | 1.88 | 11.5 | 12 | 1.12 | 80 |
| 8" | 16.5 | 2.19 | 13.75 | 12 | 1.25 | 115 |
| 10" | 20 | 2.5 | 17 | 16 | 1.38 | 170 |
| 12" | 22 | 2.62 | 19.25 | 20 | 1.38 | 200 |
| 16" | 27 | 3 | 23.75 | 20 | 1.62 | 330 |
| 20" | 32 | 3.5 | 28.5 | 24 | 1.75 | 510 |
| 24" | 37 | 4 | 33 | 24 | 2 | 730 |
ANSI / ASME B16.5 Class 600 lap joint flange dimensions
| NPS | OD in | Thickness in | Bolt circle in | Holes | Hole dia. in | Approx. lb |
|---|---|---|---|---|---|---|
| 1/2" | 3.75 | 0.56 | 2.62 | 4 | 0.62 | 2 |
| 3/4" | 4.62 | 0.62 | 3.25 | 4 | 0.75 | 3 |
| 1" | 4.88 | 0.69 | 3.5 | 4 | 0.75 | 4 |
| 1 1/2" | 6.12 | 0.88 | 4.5 | 4 | 0.88 | 7 |
| 2" | 6.5 | 1 | 5 | 8 | 0.75 | 9 |
| 3" | 8.25 | 1.25 | 6.62 | 8 | 0.88 | 15 |
| 4" | 10.75 | 1.5 | 8.5 | 8 | 1 | 36 |
| 6" | 14 | 1.88 | 11.5 | 12 | 1.12 | 78 |
| 8" | 16.5 | 2.19 | 13.75 | 12 | 1.25 | 110 |
| 10" | 20 | 2.5 | 17 | 16 | 1.38 | 170 |
| 12" | 22 | 2.62 | 19.25 | 20 | 1.38 | 200 |
| 16" | 27 | 3 | 23.75 | 20 | 1.62 | 365 |
| 20" | 32 | 3.5 | 28.5 | 24 | 1.75 | 570 |
| 24" | 37 | 4 | 33 | 24 | 2 | 810 |
ANSI / ASME B16.5 Class 600 threaded flange NPT dimensions
| NPS | OD in | Flange thickness in | Face dia. in | Bolt circle in | Holes | Hole dia. in | Approx. kg |
|---|---|---|---|---|---|---|---|
| 1/2" | 3.75 | 0.56 | 1.38 | 2.62 | 4 | 0.62 | 0.74 |
| 3/4" | 4.62 | 0.62 | 1.69 | 3.25 | 4 | 0.75 | 1.27 |
| 1" | 4.88 | 0.69 | 2 | 3.5 | 4 | 0.75 | 1.52 |
| 1 1/2" | 6.12 | 0.88 | 2.88 | 4.5 | 4 | 0.88 | 2.96 |
| 2" | 6.5 | 1 | 3.62 | 5 | 8 | 0.75 | 3.62 |
Use these tables for RFQ preparation. Final production should be confirmed against the required standard edition, drawing, material grade and certificate requirement.
Send this product for quotation
Send Inquiry
ANSI / ASME B16.5 Class 400 / 600 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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