ASME B16.5 Flange Dimensions
ASME B16.5 flange dimensions for weld neck, slip-on, socket weld, lap joint and blind flanges, Class 150 to 2500, NPS 1/2 to 24, on a 3D section model.
Technical Resources for Forged Flange RFQs
Use these practical guides to prepare clearer RFQs, compare standards, confirm inspection documents and reduce repeated clarification before quotation.
Guides by task
We file each guide under the task it helps with. Every card shows when we last updated it.
Standards & ratings
ASME B16.5 Pressure Rating Calculator
ASME B16.5-2025 flange pressure-temperature ratings for A105, LF2, WCB, F304, F316, F304L and F316L, Class 150 to 2500, in bar, psig or MPa.
Flange Rating Systems Guide
Class, PN, K, Ру and AS Table flange ratings mapped to the standards that own them: why they do not convert, and how ISO 7005-1 links PN and Class.
ASME B16.47 Flange Dimensions
ASME B16.47 Series A and Series B weld neck and blind flange dimensions, Class 75 to 900, NPS 26 to 60, in mm and inch, on a 3D section model.
ASME B16.47 Series A vs Series B
Compare ASME B16.47 Series A and Series B for NPS 26 to NPS 60 large-diameter flange RFQs: MSS SP-44/API 605 basis, bolting, facing, material, NDT and MTC 3.1.
EN/DIN vs ASME Flanges
EN 1092-1 and DIN vs ASME B16.5 (ANSI) flanges: DN/PN against NPS/Class, why DN 100 PN 16 will not bolt to NPS 4 Class 150, and the PED material scope.
GOST 33259 Flange Dimensions
GOST 33259-2015 type 01 and type 11 flange dimensions for PN 1 to 250, rows 1 and 2, facings A, B, E and F: table, 3D model and drawing.
GOST vs ASME Flanges
Compare GOST and ASME flange RFQ details including DN/NPS, PN/Class, dimensions, materials, facing, drawings and inspection documents.
RF / RTJ / FF Facing Guide
Compare RF, RTJ and FF flange facing requirements for RFQs, gasket contact, ring grooves, machining, inspection and document review.
Materials
Material Grade Guide
Choose a forged flange material by service: A105, A350 LF2, F304/F316, duplex or chrome-moly, with B16.5 temperature limits and third-party test reports.
ASTM A105 vs A350 LF2
A105/A105N for ambient and higher temperatures, A350 LF2 with impact testing for low-temperature service: which to use, plus third-party 16MnD −45 °C data.
Duplex / Super Duplex Flange Guide
Duplex and super duplex forged flanges: how to specify F51, F53 or F55, NACE, PMI and ferrite, with third-party data on our S22053 flange (55% ferrite).
Certificates & inspection
MTC 3.1 Guide
A real EN 10204 3.1 MTC sample: our certificate for 304L forged flanges, customer and order references redacted, and how to check heat, chemistry and tests.
EN 10204 3.2 Certificate
A real EN 10204 3.2 certificate issued by TÜV SÜD for A350 LF2 flanges, shown with its 11-page inspection report and the manufacturer documents behind it.
Inspection Document Checklist
Forged flange inspection documents at RFQ stage: MTC 3.1, PMI, NDT and dimensional scope, with a complete third-party type-test report as a worked example.
RFQ preparation
Forging Weight Calculator
Calculate the weight of a forged ring, disc, round bar or block in kg and lb from its size and steel grade: carbon, alloy, stainless and duplex.
Forged Flange RFQ Checklist
Prepare forged flange RFQs with standard, size, class, material, facing, inspection and destination, plus fields for rings, cylinders and custom forgings.
Weld Neck vs Slip-On Flanges
Weld neck vs slip-on flanges to ASME B16.5: the same drilling and face, a different hub and bore. NPS 2 Class 600 compared with our weld neck drawing.
LWN Drawing Checklist
Check long weld neck flange drawings for overall length, neck OD, bore, facing, class, material, tolerance, NDT and document requirements.
Packing & export
Export Packing and Marking
Review forged flange export packing, marking, rust prevention, wooden cases, shipping documents and destination requirements before RFQ.
RFQ Review Focus
Send the standard or drawing, material grade, size, pressure class, quantity and inspection requirements; we check each before we quote.
Forged flange and forged-part RFQ checklist for first quotation review
GOST vs ASME flange details for international projects
GOST 33259 flange execution, facing and RFQ control guide
EN/DIN vs ASME flange RFQ comparison
RF, RTJ and FF flange facing guide
Weld neck vs slip-on flange selection
Pressure-temperature rating table reading notes
Long weld neck flange drawing checklist
MTC 3.1 and inspection document preparation
ASME B16.47 Series A vs Series B large-diameter flange selection
ASTM A105 vs A350 LF2 material selection notes
Inspection document checklist for procurement approval
Export packing, marking and document handover notes
Forged flange material grade selection guide
Duplex and super duplex flange material RFQ guide
Send your RFQ or drawing directly to BLD Forge Direct.
Email quote@bldforgedirect.com with standard, drawing, material, quantity and inspection requirements.