Lon,
I would not for a second rely upon such a construction. You can not torque 
adequately, because of so few active threads, and also because the FR4 
material is not mechanically stable , especially not when exposed to temp 
cycling.  The heavier the block, the less reliable.  Can't see what's the 
problem with std washer and nut on the solder side?

Inge

--------------------------------------------------
From: "Lon Weffers" <[log in to unmask]>
Sent: den 17 June 2010 09:43
To: <[log in to unmask]>
Subject: [TN] Screwing earthrail into pcb FR4

> Dear all,
>
> For a customer we have to screw an earthrail (8 cable entries with screws
> M3x6, block is about 6cm long) on the componentside of the board. He uses 
> 2
> "taptide" M4x12  screws, mounted with the head on top of the earthrail,
> through the rail, into the FR4 material (1,6mm)
> There is no nut on the solderside.
>
>
> In my opinion this isn't a reliable construction. Does any of you have 
> some
> experience or remarks concerning this matter?
>
> Regards
>
> Lon Weffers
>
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