What is DIN 6930 m standard?? We have a print with measurements without tolerance

[jager]

We have a print with "measurements without tolerance, specification according to DIN 6930 m". I cannot find this standard. Does anyone know what it is or where I can find it? Thank you.

 

[Graeme]

It's not what you know, it's knowing where to look!

Jager,

First, I hope you are in the metal stamping business ...

The "DIN" tells me it's a German standard, because that's the acronym for their equivalent of ANSI.

I looked these up in NSSN (https://www.nssn.org) which is a fantastic tool for locating standards. I used the 6930 number and restricted the search to standards developed by DIN. Here are the results that popped out:

DIN 6930-1 Stamped steel parts; technical delivery conditions
DIN 6930-2 Steel stampings; general tolerances

It looks like the second one is the one you want. If you click on the titles from the search results screen, you get a description screen with a brief summary and purchase information. These are downloadable e-documents, so with luck you can be reading them by lunchtime.

(Unless, of course, your company firewall to the internet is as restrictive and paranoid as my company's is!)

 

[jager]

Din 6935

Thanks. One of our engineers ordered DIN 6930 and now we find we also need DIN 6935, just for angular tolerance of formed metal. Yes, I am in metal stamping. We produce small metal stampings for automotve and electrical, plus a few other businesses. Do you have DIN 6935? Thanks.

 

[Graeme]

Thanks. One of our engineers ordered DIN 6930 and now we find we also need DIN 6935, just for angular tolerance of formed metal. Yes, I am in metal stamping. We produce small metal stampings for automotve and electrical, plus a few other businesses. Do you have DIN 6935? Thanks.

No, I don't have any of those DIN standards. I am in the business of calibrating electronic test and measuring equipment, so they don't apply. I haven't looked, but you can probalby buy that from ANSI as well.

(As a reminder, all standards like this are the intellectual property of the organization that developed them, and are protected by international copyright law. That is why they have to be purchased just like any other book, magazine or newspaper.)

 

[jager]

DIN standard

We ordered it yesterday. To find the tolerance on formed angles, we had to spend $78! At least we have it now for future reference. Thanks for the reply.

 

[Milan Hejl]

DIN standart 6930 - 2 m

I cannot find this standard. Does anyone know what it is or where I can find it? Thank youundefined

 

[DDaenen1]

you might want to go to the DIN (Deutsches Institut fuer Normung) website: https://www2.din.de/index.php?lang=en. punch in the norm number in the search field on the right and you will get the results on where to acquire this standard.

 

[Wes Bucey]

We ordered it yesterday. To find the tolerance on formed angles, we had to spend $78! At least we have it now for future reference. Thanks for the reply.

As a matter of curiosity, I'm prompted to ask:

1. "Was this notation to use a Standard on a drawing submitted by a prospective customer for a quotation?"
   or
2. "Was this notation to use a Standard on a drawing for a part for which you had an order?"

Back when I first became involved in the precision machining business, all Military Standards were free and up to five printed copies of each were available with a simple phone call. With ready and free availability of such Standards, organizations were routinely expected to maintain a library of Standards pertinent to their trade or business. Often, organizations would send along a copy of the pertinent Standard when asking for quotes from small businesses which might not be expected to have an "oddball" Standard in their library.

Since the U.S. government got out of the Standards business, life has become a lot more complicated for smaller organizations. Organizations issuing Standards have turned publication and sale of Standards into profit-making businesses. Many Standards which are literal copies of old Military Standards now are prohibitively expensive to acquire from the organizations which have taken control of maintaining and updating the Standard.

I have some minor suggestions which might alleviate some of that pain for small organizations:

1. If your organization is being asked to quote based on a blueprint which cites a Standard not in your library, it is not out of line to ask the organization asking for the quote to give you pertinent information to help you make the quote. This might include dimension tolerances, material or plating specifications.
   
2. If your organization is asking for quotes from a supplier based on a blueprint which cites a Standard versus actual details on the print, it is not out of line to ask the organization if they have the Standard. If not, consider giving them pertinent information to help make the quote. This might include dimension tolerances, material or plating specifications.
   
3. If your organization is the successful bidder, then, and only then, should your organization invest in the actual Standard.

 

[Neil V.]

Re: din 6930 m spec

We have a print with "measurements without tolerance, specification according to DIN 6930 m". I cannot find this standard.

Same here. I see the DIN 6930 2 standard (from the link provided above), but don't see DIN 6930 M, as called out on our print.

Our spec on file is DIN 6930 Part 2, Steel Stampings General Tolerances - which correlates to what is offered on the DIN website.

Any ideas what that M denotes? Thanks in advance!

(as a side note, it ocurred to me that Germany seems to be under-represented on the cove. just an observation.)

 

[Jim Wynne]

Re: din 6930 m spec

Same here. I see the DIN 6930 2 standard (from the link provided above), but don't see DIN 6930 M, as called out on our print.

Our spec on file is DIN 6930 Part 2, Steel Stampings General Tolerances - which correlates to what is offered on the DIN website.

Any ideas what that M denotes? Thanks in advance!

(as a side note, it ocurred to me that Germany seems to be under-represented on the cove. just an observation.)

According to this source, DIN 6930-2 has been withdrawn, but the abstract on that site says this:

This standard is intended to simplofy [sic] drawings. It specifies general tolerances on linear and angular dimensions and on coaxiality and symmetry in four accuracy grades comprising f (fine), m (medium), g (coarse), and sg (very coarse). When selecting a defined accuracy grade, the respective workshop accuracy is to be taken into account. If smaller tolerances are required or if larger tolerances are permitted and more economical, these shall be indicated adjacent to the relevant basic size. General tolerances as specified in this standard intended for use cold and hot stampings made from steel flat products. They shall apply whenever reference is made to this standard on drawings or relevant documents (e.g. in delivery conditions).

(Emphasis added).