Standard flanges are the catalogue geometries a piping class already fixes - weld neck, slip-on, socket weld, threaded, lap joint and blind - made to published table dimensions rather than to a one-off drawing. This page is for a bill of materials, not for a special part.
Use the published ASME tables to identify the RFQ route: B16.5 covers Classes 150 to 1500 at NPS 1/2 to 24 and Class 2500 at NPS 1/2 to 12; B16.47 covers Classes 75 to 900 at NPS 26 to 60. EN 1092-1, DIN 2527/2633 and GOST 33259/12820/12821 requests follow their exact DN/PN table or project drawing. Facing and grade requests, including RF/FF/RTJ and ASTM A105/A105N, A350 LF2, stainless 304/316/321/347, alloy, duplex or nickel, are reviewed against the purchase specification and drawing before BLD confirms feasibility; the published scope does not promise every grade and facing combination.
ASME B16.5 tabulates Class 2500 through NPS 12; above NPS 12 we forge Class 2500 flanges to your drawing and design calculation. We supply ASME B16.47 Series A and Series B flanges across NPS 26 to NPS 60, in the classes and sizes the standard tabulates for each series. Our D51 mill rolls rings up to 1,500 mm OD and 240 mm thick; larger rings are forged by partner forges near our plant in Dingxiang.
For a purchase list with several standard flange items, use one row per item and state its governing standard or drawing, flange type, NPS/DN, Class/PN, facing, bore or schedule where applicable, material grade and quantity. Include the requested inspection documents, destination country and packing requirements with the RFQ so each line can be reviewed against its own specification.
Product family: Flanges
Standard flange RFQs are reviewed by flange type, standard, size, pressure class, facing, material grade, quantity, inspection documents and destination country.
If you hold standard flanges in stock for resale, send your replenishment list as it stands. We quote it line by line, on these terms:
| Scope and rating | |
|---|---|
| Catalog scope | WN, SO, blind, socket weld, threaded, lap joint and plate-type standard flanges for line-item purchase lists. |
| Supplied variants |
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| Standards and materials | |
| Standards / drawings |
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| Material grades |
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| Geometry, tolerance and inspection | |
| Size and rating review | Published ASME scope for RFQ routing: B16.5 Classes 150 to 1500 at NPS 1/2 to 24 and Class 2500 at NPS 1/2 to 12; B16.47 Classes 75 to 900 at NPS 26 to 60. EN/DIN/GOST DN/PN scope and BLD supply feasibility are reviewed against the exact purchase specification or project drawing; the published ranges do not guarantee every combination. |
| Price drivers | Type, material grade, pressure rating, facing, bore, quantity, certificate scope and mixed-line packing requirement. |
| Inspection depth | Dimensional table check, heat number marking, MTC 3.1, face finish and packing verification. |
| Reviewed before quotation |
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| Buying logic | |
| Best-fit RFQ | Best for standard flange line items controlled by ASME, EN, DIN, GOST or a project purchase specification. |
| Buyer application | Distributor replenishment, EPC bulk packages and standard piping flange purchase lists. |
Your standard, drawing revision and project specification govern.
Also known as
We confirm each step against your drawing or standard before we quote.
Material grade, heat number, certificate basis and substitution limits are checked against the Standard Flanges drawing or standard before procurement is released.
The forging route is selected around flange type, section thickness, bore allowance, hub or neck geometry and pressure-service requirements.
Heat treatment is planned with the required record package, mechanical testing basis and impact-test condition where low-temperature or alloy service applies.
Rough machining opens reference faces, bore, hub, neck or sealing-face stock needed to control allowance before final flange machining.
Final machining controls facing, bore, bolt pattern, groove, sealing surface and flange-table or drawing tolerances before dimensional inspection is issued.
Inspection covers dimensional report, MTC 3.1, PMI and required UT, MT or PT records before the release documents are matched to the purchase order.
Marking, packing and export documents are prepared by PO line item so the Standard Flanges shipment can clear customs and be identified at site receiving.
List document requirements in the first RFQ; they affect price and schedule.
When its dimensions come from a one-off drawing instead of a published table. Standard flanges are the catalogue geometries a piping class already fixes - weld neck, slip-on, socket weld, threaded, lap joint and blind - made to ASME, EN 1092-1, DIN or GOST tables.
Yes. Besides type, material grade, pressure rating, facing, bore and quantity, the certificate scope and any mixed-line packing requirement are part of what we price.
A dimensional check against the table, heat number marking, MTC 3.1, face finish and packing verification.
Email quote@bldforgedirect.com with standard, drawing, material, quantity and inspection requirements.