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Looking for Countersink for 4-40 Screws that allows "tapping

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gareywittich2000(at)yahoo
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Posted: Sun Dec 30, 2012 6:49 pm Post subject: Looking for Countersink for 4-40 Screws that allows "tapping

I posed the original question.  The 4-40 screws I will be using (MS24693 formerly AN507) have the 100 Degree angle just like the the AN426AD rivets.  The  Countersink I am looking for needs to have a 100 degree angle and have a 0.089" Diameter Guide Pin so the 0.089 Dia hole in the material can be "Tapped" for the 4-40 screw threads after countersinking.  Using a 100 Degree Deburring Tool Bit will be too time consuming because of the number of screws used.  Using #6 Screws or larger will be a problem.   Using the Countersink made by Cleveland for 4-40 screws has too big a diameter Guide Pin.   Any ideas where to get the above Countersink (100 Degree Angle and 0.089" Dia Guide Pin) ??  Many thanks,  Garey Wittich



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