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One item often overlooked in countersinking, is that it should be done with a countersink, not with a twist drill. This is because the angle of a twist drill is too shallow to match the angle on the head of a countersink screw.
Of course, counter sink screws are made in both slottedand Phillips head forms.
Countersink screws are usually used for cosmetic reasons, not for engineering strength.
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What is Countersinking?
Countersinking is the drilling of part of the metal/wood, so as to allow an ordinary countersink screw head to lie flush with the surface. The angle of the head of a countersunk screw differs from the angle of a standard drill. So one should use a special countersink drill for the job. It is not proper to prepare the hole, for a countersunk head, by using a standard metal drill.
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What is Countersinking?
Countersinking is the drilling of part of the metal/wood, so as to allow an ordinary countersink screw head to lie flush with the surface. The angle of the head of a countersunk screw differs from the angle of a standard drill. So one should use a special countersink drill for the job. It is not proper to prepare the hole, for a countersunk head, by using a standard metal drill.
What is the difference between countersinking and counter boring?
Countersinking is the forming of a shallow conical shape into a hole or fastener position to accommodate the matching conical head of a flat head screw. Generally, counterboring is the forming of a much deeper, squared bottom, cylindrical area at the origin of a hole or fastener position to accommodate and receive the head of a round-headed fastener, such as a socket head cap screw. Both processes are for the purpose of positioning the fastener such that its head is flush with or below the surface of the component which it is fastening. "Recessed" as it were.
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