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June 1999

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Subject:
From:
Ed Cosper <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 15 Jun 1999 16:49:08 -0400
Content-Type:
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Thanks to all that responded.  Based on received information, I am drawing
the conclusion that it would be difficult to maintain a class 2b tolerance
on an .090 thick FR4 epoxy board. One response indicated that this
tolerance/class would be OK on metal but not FR4 epoxy since the epoxy would
not retain the pitch and definition needed especially if being verified with
a class 2b check gage.

Any comments?

Ed Cosper


-----Original Message-----
From: Kathy Stillings <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Tuesday, June 15, 1999 2:47 PM
Subject: Re: [TN] Fab: Tap and die callouts


>#10-32 UNF-2B thru means National fine series thread as said and the 10-32
is
>the diameter and thread count per inch.  The Class 2B is the allowances and
>tolerances for obtaining the fit.  This is a very detailed process of pitch
>diameter, major and minor diameter, root radius, etc...  All in all summed
up
>Class 2 specifications do vary from a fit with no play when the pitch
diameters
>of mating parts are common to a fit with some play.  Class 2 is the
Cadillac of
>commercial screws.  If you need more detailed information like how to
inspect
>for class 2 please EMail me.
>
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