Steve,

Our 'bible' (our internal specifications) calls out 0.015 over nominal lead diameter for every
lead, insertable or not and it has worked great for us.  The 0.015 is for all leads including
those odd shaped ones.

Steve Collins wrote:

> Technetters:
>
> I have been using the IPC guidelines for Radial & Axial part hole sizes for
> some time now for non-auto-insertable parts. I was doing this because from
> my way of thinking all parts are either radial or axial just not all are
> auto-insertable. My question is, if I'm working to IPC-D-275 level B is it
> safe to split the dimensions shown in table 5-15. What I mean is this table
> calls out for "No greater than 0.7 mm (0.028) over minimum lead diameter"
> and " No less than 0.20 mm (0.008) over maximum lead diameter." Since there
> is a .020 difference from min to max I would like to split this and use
> .010 plus the min .008  for .018 over nominal lead diameter for these types
> of parts. Does this thinking justify itself for most applications.
>
> Steve Collins
> Antec Corporation
>
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