Metric Hardware for Gliders
tom_systek
suppliers. For example (www.metricspecialties.com):
Metric Specialties, Inc. is a major distributor of metric fasteners and
related tools. For more information on our complete line and information on
ordering, click on 'Products' above.
For your confidence and security, our site has a secure order form to
protect your orders placed online with us. See the logo below for more
information
Toll Free: (800) 800-6696
Phone: (818) 848-6696
Fax: (818) 848-3951
622 S. Flower Street
Burbank, California 91502
________
Tom Seim, 2G DG-400
Richland, WA
Doug Jacobs
etc.) of the type found in German gliders on this side of the pond -
anyone know of a good source, particularly with a good catalogue or web
site?
DJ
Mark Emmer
satisfactory definition of what an "aircraft grade" metric fastener was,
since there's no A/N system for metrics. (This despite calls to the FAA
and to companies that did service on the Airbus.) I found plenty of metric
suppliers, but none who could tell me what "aircraft grade" meant, other
than "what the manufacturer sells you."
Finally looked at the tensile strengths of the various metric Classes, and
picked plated nuts and bolts that were stronger than a typical A/N bolt.
It wasn't a major structure, so my I/A agreed to go with it.
Metrics come in various Classes for different tensile strengths. If I
remember, we used class 8.8, but the tensile strength chart is at another
location. Reply to this thread if you want me dig it up and post the
numbers.
Best thing is to get them from the manufacturer, but if he's out of
business, as mine was, you have to improvise.
Another thought would be to contact Vitek at Blanik America. Vitek keeps a
very good stock of fasteners used on the various Blaniks, and since it's a
type certified glider, I would presume that his fasteners are ipso facto
"aircraft grade."
Mark Emmer
Robertmudd1u
> I never did find a satisfactory definition of what an "aircraft grade"
metric fastener was, since there's no A/N system for metrics.>
Yes there is. All German aircraft grade hardware is listed as "LN" This stands
for Luft Normal or Air Standard. There are specification sheets for each part
and a numbering system not un-like the AN/NAS system.
One problem is that as far as I know there is no catalog published that lists
all the hardware and specs. Each of the suppliers has complied their own but
no one has published one.
I have bought from Boysen GmbH in Munich, Germany and found them good to work
with. Sorry but I do not have the contact info here.
The other standard for hardware in Germany is the DIN, or German Industry
Standard. These standards are quite good. Books are published for this system
but are expensive. Lang & co. in Kassel is a good source.
Under certain conditions DIN hardware is allowed to be used in aircraft in
Germany
It may be that the dealers or repair shops for German gliders will have some
stock on hand.
>Finally looked at the tensile strengths of the various metric Classes, and
picked plated nuts and bolts that were stronger than a typical A/N bolt.
It wasn't a major structure, so my I/A agreed to go with it.>
The failure mode of AN bolts very different than a grade 8.8 bolts, be
careful.
Robert Mudd
RFR
you are looking for, or could at least tell you where to get them.
Cheers,
Roderick Read
Bert Willing
Robertmudd1u wrote:
>
> >Finally looked at the tensile strengths of the various metric Classes, and
> picked plated nuts and bolts that were stronger than a typical A/N bolt.
> It wasn't a major structure, so my I/A agreed to go with it.>
> The failure mode of AN bolts very different than a grade 8.8 bolts, be
8.8 grade bolts are fine for aircraft, 10.3 grade also works.
Bolts less than 8.8 do not have the required strength, and bolts above 10.3 do
not have the required strain before rupture.
--
Bert Willing
-----------
Caproni Calif A21S D-6600
Come fly at La Motte du Caire in the French Alps:
http://www.decollage.org/la_motte/
tom_systek
numbers for some others. The only hardness I've seen specified is 8.8. Bolt
suppliers have DIN catalogs and, in one case, they've faxed me pages out of
their manual. Metricspecialties.com can search by DIN number, just be aware
that this can turn up literally dozens of different fasteners.
Robertmudd1u <robert...@aol.comnojunk> wrote in message
news:19991218220404...@nso-fm.aol.com...
> >Finally looked at the tensile strengths of the various metric Classes,
and
> picked plated nuts and bolts that were stronger than a typical A/N bolt.
> It wasn't a major structure, so my I/A agreed to go with it.>
> The failure mode of AN bolts very different than a grade 8.8 bolts, be
> careful.
>
> Robert Mudd
>
>