Why do #10 countersink/drills have different pilot sizes: hex‑shank 3/16" vs round‑shank 1/8"?
82 Degree Carbide Tipped Countersinks with Hex Shank
Why are the drill sizes different between hex shank countersinks and round shank countersinks? #55211 has a 3/16" drill diameter while #55266 has a 1/8" drill. Both countersinks/drills are specced for a #10 xxxx . Since a #10 wood xxxx has a nominal shank diameter of 3/16", it would seem that the 3/16" hole of #55211 would be too large.
Status:
Open Dec 07, 2016 - 12:00 AM
1answer
Answer
Dec 07, 2016 - 12:00 AM
A 3/16" tapered drill or an 1/8" straight drill would be required for a #10 xxxx if drilling into softwood.
However the 3/16" drill on 55211 is a straight which could be a typo on our description.
For better assistance please email us to ttsupport@toolstoday.com and let us know what xxxx # you have and what material you will need to drill into
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82 Degree Carbide Tipped Countersinks with Hex Shank
Quick Release 1/4" Hex Shank With Slow Spiral, Includes High-Speed Steel (HSS) M2 DIN 338 Fully Ground Drill Drill pilot hole and tapered countersink for wood screws. Carbide-tipped for long lasting results. Excellent For Drilling: Acrylic Aluminum/Non-Ferrous* Aluminum Composite Material...
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