BLD Forge Direct
Blind flange RFQs are checked by standard, size, class or PN, facing, material grade, thickness, marking, inspection documents and destination country before quotation.
This is the quick technical view a buyer, EPC engineer or distributor needs before deciding whether this is the right product page.
Blind flange RFQs are checked by standard, size, class or PN, facing, material grade, thickness, marking, inspection documents and destination country before quotation.
| Product family | Flanges |
|---|---|
| Typical scope | ASME B16.5 blind flanges; EN 1092-1 Type 05 blind flanges; DIN blind flanges; GOST blind flanges; High-pressure blind flanges |
| Standards / drawings | ASME B16.5; EN 1092-1; DIN PN standards; GOST 33259 / 12820 / 12821; Project drawing or purchase specification |
| Material review | ASTM A105 / A105N; ASTM A350 LF2; ASTM A182 stainless grades; Duplex and super duplex grades; Project-specified alloy steels |
| Critical RFQ variables | Outside diameter and thickness; Bolt hole pattern; Facing type: RF, FF or RTJ; Class / PN pressure rating; Material certificate and heat number marking; NDT and dimensional report requirements |
| Inspection documents | MTC EN 10204 3.1; Heat treatment record; Dimensional report; PMI when alloy verification is required; UT, MT or PT when specified; Tensile, impact or hardness test records when required |
This section is written for buyers checking whether the picture, product name and quotation scope match the same forged part.
Best for closed-end pipe, vessel nozzle and pressure isolation line items.
Pipeline isolation, pressure vessel nozzles, valve end closures and maintenance blinds.
OD, thickness, facing, bolt hole pattern, class or PN and material grade define the scope.
Send standard, NPS or DN, class or PN, facing, thickness if custom, material, quantity and certificates.
Thickness, drilling, face finish, marking, MTC and NDT requirements should be agreed before quotation.
These product-specific values make the page different from a generic catalogue listing and help engineering buyers send a complete first inquiry.
| Size and rating review | NPS 1/2 to 60, DN 15 to 1500, ASME Class 150 to 2500 and PN ratings by EN/DIN/GOST tables. |
|---|---|
| Standard references | ASME B16.5/B16.47 blind flange, EN 1092-1 Type 05, DIN 2527, GOST blind flange references. |
| Critical dimensions | OD, thickness, bolt pattern, RF/FF/RTJ face, gasket contact surface and pressure-test requirement. |
| Material families | A105, LF2, stainless F304/F316, duplex F51/F53 and project low-temperature or corrosion-service grades. |
| Inspection depth | Thickness check, drilling, face finish, marking, MTC 3.1, PMI and NDT when high-pressure service requires it. |
Direct Product Datasheet
Download the visible product-page technical data as a PDF before sending drawings or line items. This datasheet is generated from the page's published RFQ scope table and does not invent standard dimensions.
This direct link is not gated by a form. For ASME B16.5 Class 150 selected dimensions, use the standard dimension check sheet where shown below.
Open this page when your RFQ matches one of these scope items, or send a drawing if the forged part is non-standard.
ASME B16.5 blind flanges
EN 1092-1 Type 05 blind flanges
DIN blind flanges
GOST blind flanges
High-pressure blind flanges
RTJ blind flange requirements
Custom drawing blind flanges
These names may appear in drawings, purchase lists, distributor RFQs and supplier shortlists.
The strongest RFQ gives the commercial team the same technical language used by engineering, QA and the final buyer.
Use this route to understand what has to be confirmed before price, lead time, MTC 3.1 and third-party inspection commitments are made.
Material grade, heat number, certificate basis and substitution limits are checked against the Blind 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 Blind Flanges shipment can clear customs and be identified at site receiving.
Include document requirements with the first RFQ so inspection cost and timing are visible before offer comparison.
Send these details in the first message to avoid repeated clarification and mismatched offers.
Standard
Size
Class / PN
Facing
Thickness
Material
Quantity
MTC requirement
NDT requirement
Destination country
These issues make supplier offers look cheaper or faster than they really are because the technical scope is incomplete.
Short answers for common RFQ questions.
Yes. Send the latest drawing revision with material, quantity, tolerance, inspection and destination requirements so the RFQ can be checked before quotation.
A practical RFQ should include standard or drawing, size, pressure rating, material grade, quantity, inspection requirements and destination country.
Common requests include ASTM A105, A350 LF2, stainless steel, duplex steel and project-specified alloy grades, subject to drawing and service requirements.
MTC 3.1, dimensional reports, heat treatment records, PMI, UT, MT, PT and third-party inspection can be reviewed according to the project requirement.
Email quote@bldforgedirect.com with standard, drawing, material, quantity and inspection requirements.