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Subject: Europa-List: Wing spar pip pins
From: Fred R. Klein <fklein@orcasonline.com>
Date: Sun, 19 Sep 2004 08:31:23

> 

> With respect to the Pip Pins for the main spars, just want to draw
> everybody's attention to the fact that those listed in the Aircraft Spruce
> Catalog(ue) are quote "NOT FOR STRUCTURAL USE ON AIRCRAFT"

All,

Point well taken!

With respect to those in the McMaster-Carr catalogue, there is no mention of
limitations on intended use; however, there is extensive information on
structural qualities of the listed products given on cat. pg. 3088, to wit:

> Shank and spindle are precipitation-hardened stainless steel (17-4PH or 15-7
> MO). 
> Rockwell hardness for the shank and spindle is C40.
> The two locking balls are stainless steel. Rockwell hardness for thelocking
> balls is C25-C38 for Styles A and B ; C58-C62 for Styles C-G .
> For Styles A-F diameter tolerance is -.0015" to -.003" For Styles A-F length
> tolerance is +.020";

> Double shear strength (listed in chart) is the amount of force applied to
> the side of a pin in two places causing it to break into three pieces.
> 
>      Inch(StylesA-F)     
>                            Diameter          1/2"

>                    Double Shear Strength, lbs.  36,800

Interpretation of this data is well beyond my expertise; perhaps the factory
would render an opinion. (?)

Fred
A194




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