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[Amps] Countersinks - was Alpha 76A

To: w9ac@arrl.net, "amps@contesting.com" <amps@contesting.com>
Subject: [Amps] Countersinks - was Alpha 76A
From: Rick <nm3g@triad.rr.com>
Date: Tue, 25 Nov 2014 18:37:47 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Good evening Paul,

82° is the ANSI screw standard (commercial).
100° is the MIL/Aviation standard, to accommodate rivets and fasteners in thin sheet metal (more of a bearing surface to keep the head from pulling through).
90° is metric.

I'd go with the 82°.

Hope this helps.

73,
Rick
NM3G

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