On Jun 20, 11:48 am, Dan wrote:
El Maximo wrote:
"oilsardine" wrote in message
...
hi, guys,
I just ordered some stainless piano-hingepins (pn#03-49000). What Aircraft
Spruce delivered were some cad-plated rods. I previously got some
stainless and these were silvery-shiny. I complained at AS and they
responded that their stainless 302 pins truely were cad-plated (?) I never
heared about such. What should cad-plating of stainless be good for?

I work at a place that sells a bunch of stainless and cad-plated parts. I
asked one of the engineers if it was possible to cad-plate stainless steel.

He replied it makes no sense at all. Cad plating is used for corrosion
resistance. Stainless steel is corrosion resistant.

Stick a magnet to the part and see if it sticks. Magnets don't stick to
stainless steel.

Some stainless alloys are magnetic.


Some (or all) of the 400 series are ferromagnetic.
Stainless steel bolts typically are 18-8 (300 series)
and are not. However the 300 series are not heat-treatable
and some of the 400 series are.

Back when I worked in the nuclear industry we used
stainless steel bolts that were cad plated for lubricity.
Sometimes we used some that were silver plated on the
threads only for the same reason. We pretty much
only used 316 SS bolts and nuts.

It is not likely that plating would be done to prevent
hydrogen embrittlement as electroplating is one CAUSE
of hydrogen embrittlement. However, hydrogen diffuses
poorly through nickel so if a bolt were intended for an
environment where hydrogen could diffuse into it, nickel
plating might help. Never heard of that being done--that
part is just speculation.

--

FF