How do you use a countersink symbol?

Table of Contents

Countersink symbol Some older blueprints may use the notation CSK to identify a countersink dimension. If you want to type the ⌵ symbol, hold the ALT key and press 9013.

What is a countersink hole?

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. A counterbore is used to enlarge the opening of a hole producing a flat bottom so a socket-head screw will fit flush with the surface of the part.

What is the angle of countersink?

Countersunk-head screws that follow the Unified Thread Standard very often have an 82° angle, and screws that follow the ISO standard very often have a 90° angle. Throughout the aerospace industry, countersunk fasteners typically have an angle of 100°.

How does a countersink bit work?

A countersink bit creates an area in the wood that matches the countersunk shape of the screw head. This shape allows the screw to contact the wood with an equal amount of force. This creates a strong joint between the screw and the wood.

What does a countersink look like?

Fluted bits have one or more cutting edges, cross-hole countersinks have an angled hole in the tip which acts as the cutting edge. One-piece countersinks come in two main flavors, the most commonly recognized being a fluted countersink, which has a short shank with an elongated cylinder topped with a conical tip.

Is it countersink or countersunk?

An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt. A drill or cutting tool for countersinking holes. A countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole.

What is CSK head screw?

Also known as a flat-heat screw, a countersunk screw is a type of screw that’s designed to rest flush with the object or surface in which it’s inserted. They are called “countersunk screws” because they “sink” into objects and surfaces. They feature a flat head that tapers along the shaft.

What is a clearance hole?

A clearance hole is a hole through an object which is big enough to enable threads of a screw or bolt to pass through but not the head of the screw or bolt. It allows a screw to pass through it without the threads biting into the material.

Do I need a countersink bit?

For soft woods, like pine, a countersink may not be needed, as you can usually just drill a wee bit longer to get the head flush. But for hardwoods, countersinks are a must if you want the screw head flush, or to hide it completely below the surface by placing wood filler or a plug above it.

What is the symbol for countersink?

A countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. ASME Y-14 Counterbore Symbol Counterbore Symbol.

How are countersink holes shown on drawings?

Countersunk holes are shown on drawings as follows – the bottom section view shows what the top dimension refers to. If the countersink was a blind hole, the ‘Through’ above would be replaced with the depth of the pilot hole.

How do you know if a countersink is blind?

What are counterbore and countersink holes?

Countersunk holes are used for applications where a countersunk bolt or screw is required. Like counterbore holes, countersink holes ensure the bolt or screw sit below the surface.