XPost: sci.electronics.components, sci.electronics.design, de.sci.electronics   
   From: waldemar@zedat.fu-berlin.de   
      
   Am 19.11.2015 um 18:07 schrieb Ralph Mowery:   
   > "DaveC"  wrote in message   
   > news:0001HW.1BFE327E00023B161112783CF@news.eternal-september.org...   
   >>> Which DIN?   
   >>>   
   >>> RL   
   >>   
   >> No one in particular. Am having a friendly disagreement with a friend   
   >> about   
   >> what a DIN number means. Does it define things like material, tolerance,   
   >> finish and hardness or does it include size, thread, etc? In other words,   
   >> does the DIN number define a particular, specific fastener (including   
   >> dimension) or only the standards to which that fastener is measured   
   >> against?   
   >>   
   >> I always related DINs to the US MILSPEC standards which generally are   
   >> standards, not product definitions.   
   >>   
   >   
   > DIN defines the size of things.  Say a bolt with  a certain DIN number   
   > standard will be so many milimeters long, have a certain number of thread   
   > pitch per mm.   
   >   
   > I don't know for sure, but suspect that it does not mean the bolt will be so   
   > strong or hardened unless aditional informationis added.   
   >   
   > Not that familiar with metric standards, but lets use an American bolt as an   
   > example.  If you want a 1/4-20 bolt then it will be 1/4 inch in diameter and   
   > have 20 threads per inch.  It may or may not be hardened, made of   
   > steel,aluminum or any thing else unless specified.   
      
   Not quite. It is not like one DIN-Number == one bolt (or something   
   else). Each number defines a certain kind of things, therms and   
   everything :-). There is a DIN-Norm for writing a text (i.e. a thesis at   
   the university), there is a DIN-Norm for drawing a cirquit diagram, a   
   house, a 3D drawing or anything else. Most of them have a EN "in back".   
   For example DIN825-1 defines laser safety (yes, I know, this norm is now   
   obsolete but I'm too lazy to find new numbers), the adequate European   
   Norm is EN60825-1.   
   Another example: DIN912 defines cylindrical bolts with allen key   
   fitting. All of them. Including UNC & UNF i.e. non-metric bolts.   
      
   HTH   
      
   Waldemar   
      
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