Metric Fastener Part Numbers
Metric Fastener Part Numbers
(OP)
I work for an aerospace, defense electronics manufacturer. We work with primarily with Imperial/English fasteners (2-56, 4-40, etc.) and due to our industry, we always reference MS or NAS part numbers (MS51957, NAS620, etc.). I would like to know if metric fasteners are detailed in a similar fashion. ANSI standards are not sufficient, as they only specify the shape, not material, finish, testing methods, etc. as the appropriate Mil- or NAS standards do.





RE: Metric Fastener Part Numbers
A source I use is:
http://www.mdmetric.com/fastindx/inxtst.htm
They have a page linked there (T44) with full reference threads.
RE: Metric Fastener Part Numbers
RE: Metric Fastener Part Numbers
RE: Metric Fastener Part Numbers
I have a similar problem trying to identify metric screws by part number for use in aircraft. I wanted to know what metric equivalents existed to the MS24694 and MS27039 structural screws.
I went searching for maintenance information on Airbuses. Those have got to contain metric fasteners. Reality is that they contain at least some inch size fasteners. The metric stuff seems to be ordered to Airbus standards, rather than to some ISO, DIN, or EU standard.
Metric pan head machine screws are a pain, because very few catalogues and standards seem to describe what I get when I order one. Our metric pan heads conform closely to what is described in my Gould Fasteners catalogue as a "raised, recessed cheese head" machine screw, as per DIN7985.
The Barnhill Bolt company at http://www.barnhillbolt.com/ quotes similar accurate dimensions for phillips pan head screws conforming to ISO7045.
I am not aware of a metric equivalent to the aircract structural screws, although I would love to be set straight.
JHG
RE: Metric Fastener Part Numbers
Does the AIA not have metric structural screws?
RE: Metric Fastener Part Numbers
Airbus do not use any metric fasteners. They use exclusively inch threads. As already stated, metric aerospace fasteners are defined in NA (AIA) specs. in the US or in EN (AECMA) specs in Europe. See www.aecma.org for a link to qualified manufacturers for EN screws, which will then lead to their catalogues.
RE: Metric Fastener Part Numbers
That seems like an extreme statement. Are there zero M/MJ threads on an Airbus plane? What about other non-US manufacturers like Embraer or Bombardier?
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Metric Fastener Part Numbers
RE: Metric Fastener Part Numbers
Also, they list the preferred washer type as NA0034 which is a nut with "extended washer" a kind of integral nut/washer. Does anyone know the NA spec for standard hex and small pattern nuts (non-structural)?
Thanks.