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those are not anything like common angles. Usually countersinks for flat head screws are 82 degrees. some countersinks do 90 degrees. And that's about all you see are 82 and 90 degree countersink bits.

100 degree and 130 degree countersinks are more often found in Aircraft flush fittings/bolts

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13y ago

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Q: What is the difference between a 100 degree and 130 degree countersink?
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