Standard reference · legal sources
Where to get ASME, EN and JIS flange standards — legally
Every table on this site is transcribed from a published standard and cited. The standards themselves are copyrighted, so we do not host or republish the full documents. This page lists the official channels, the free legal previews, and the edition each of our data tables comes from.
If you only need a size, a rating or a tolerance, the reference pages here will usually answer it. If you need the full text for a design check, a contract or an audit, buy the edition your project names.
Current editions and where to buy them
| Standard | Current edition | Official sources | Notes |
|---|---|---|---|
| ASME B16.5 | ASME B16.5-2025 | ASME Store, ANSI Webstore, Accuris | Paid. Free IBR copy of the 2020 edition is available for reading; the 2025 edition revised the pressure–temperature tables. |
| ASME B16.47 | ASME B16.47-2025 | ASME Store, ANSI Webstore, Accuris | Paid. No free full copy; the predecessor MSS SP-44:2010 (Series A dimensions) has an IBR copy. |
| EN 1092-1 | EN 1092-1:2018 (+2019 corrigendum) | DIN Media, BSI, NSAI, AFNOR, ILNAS | Paid. Several national members publish a free preview of the first pages. |
| JIS B2220 | JIS B2220:2012 | JSA Webdesk | Paid. JSA publishes a free preview PDF. |
Prices and availability change; check the publisher’s page before ordering. Buy from the publisher or an authorised reseller — marketplace PDFs are often old editions, incomplete or tampered with.
Free and legal ways to read a standard
1. Official preview pages
ASME, CEN national members and JSA publish the cover, foreword, contents and scope for free. That is enough to confirm an edition, a table number or a term — not enough to design from. EN 1092-1 previews are available through several CEN members (for example ILNAS); JSA publishes a JIS B2220 preview on its Webdesk.
2. Incorporated-by-reference (IBR) copies
Some US standards are incorporated by reference into federal regulations and are made available for public reading. ASME B16.5 is one of them; publicly archived copies of older editions can be read. The legal status of these copies is debated, they are not the current edition, and they are not a substitute for a purchased copy in a contract.
3. Library and subscription access
Engineering libraries, university subscriptions and standards reading rooms (ASME Digital Collection, Accuris, DIN/BSI/JSA reading rooms) let you consult the full text without buying it. Inter-library loan can also supply a copy for reference.
4. Ask the party that specified it
In most projects the purchaser or EPC contractor already holds the edition named in the specification. Ask them for the relevant clause or for permission to use their copy.
How our data is sourced
For each standard page we record the edition, the table or clause number and the page the values were transcribed from. Values are typed against the printed page, not copied from a secondary chart, and the transcription date is shown as “Verified”. Where a standard has been revised since our dimension dataset was compiled, the reference page says so and links to the revision summary.
If you find a value that does not match your copy of the standard, tell us the table and the edition and we will correct it. That feedback loop is the reason the reference pages carry a verification date and a contact link rather than pretending to be the standard itself.
Questions about standards and copyright
Why don’t you host the full standard PDFs on this site?
The standards are copyrighted documents. Republishing them would infringe the publishers’ rights and expose both us and our customers to legal risk. We publish our own transcriptions of factual data (dimensions, ratings, tolerances) with the source table and edition cited, and we link to the official channels where you can buy or legally read the full text.
Is a free IBR copy good enough for design or contract acceptance?
No. An incorporated-by-reference copy is useful for reading and for understanding the structure of a standard, but it is usually an older edition and its legal status as a free copy is debated. For design checks, contract acceptance or third-party audits, buy the edition named in your project specification.
Which edition are your dimension tables based on?
The dimension datasets were compiled from the editions named on each standard page. ASME B16.5 and B16.47 were transcribed from the 2017 editions, then checked against the 2025 edition’s summary of changes; dimensions were not revised in 2025, but the pressure–temperature ratings were. If your project names a different edition, verify the values in your purchased copy before releasing a part to production.
Can you supply a flange to a standard we send you?
Yes. Send the standard number, edition, size, rating, facing and material — or the drawing. We machine to ASME, EN, JIS and customer drawings, and we will state the edition we worked to on the drawing and the inspection report.