What is a countersink used for?

What is a countersink used for?

A countersink is a cutting tool which puts a conical hole into an object. A common use is to allow the head of a countersunk bolt or screw, when placed in the hole, to sit flush with or below the surface. Countersinks may also be used to remove burrs left from drilling or tapping operations.

What is countersink set?

Countersink Sets Countersinks expand the top of an existing hole in a workpiece to ensure screws install flush with the surface of the workpiece. This can prevent the workpiece material from swelling when a screw is installed in the hole and tightened down. These sets contain multiple countersinks in a range of sizes.

How big is a countersink?

Unless otherwise specified, countersunk holes are of a diameter 0.10-. 015″ larger than the basic size of the laser hole at . 80 (or 82) degree and 100 degree countersinks are most common for flat head screws.

Why is it called countersink?

Overview of Countersunk Screws They are called “countersunk screws” because they “sink” into objects and surfaces. They feature a flat head that tapers along the shaft. Therefore, when you drive a countersunk screw into an object or surface, the head will sink so that it’s flush with the respective material.

When should you countersink?

Countersinking is done to insure that flat head screws sit flush to the work piece. A countersink produces a conical hole matching the angle of the screw so that when the screw is fully engaged the head will sit flush or slightly below the surface.

How do you call a countersink?

Draw the leader, or dimension line, with the arrow just touching the edge of the outer circle of the countersunk hole. Draw the line radially, so that it points toward the center of the hole, and if extended it would pass through the center point.

How do you specify countersink on a drawing?

Write the dimensions of the countersink, giving first the diameter of the drill hole, then the angle of the countersink, followed by the diameter symbol and the diameter of the larger hole. This dimension can be given either with a diameter symbol first, or with the word DRILL after the first diameter.

How many flutes does a countersink have?

All Drill Countersinks have 4 flutes. Plain Type High Speed Steel Combined Drill and Countersinks are designed to produce accurate center holes in components which require machining between centers.

What size countersink bit for #12 screw?

7/32″
Wood Screw Pilot Hole Sizes

How deep can a countersink go?

Amana Tool Carbide-Tipped Countersink The depth stop can be adjusted to make a countersink anywhere from 3/64″ to 3/8″ deep, a range which is shallow enough for flush-mounting and deep enough to accommodate a plug to cover the screw entirely.