What is CSK hole? Countersunk Holes A countersink is a tapered hole drilled with a wide outer portion. A common usage of the countersunk hole is to allow the head of a flat head bolt
What is CSK hole?
Countersunk Holes A countersink is a tapered hole drilled with a wide outer portion. A common usage of the countersunk hole is to allow the head of a flat head bolt or screw, when placed in the hole, to sit flush with or below the surface of the surrounding material.
How are CSK screws measured?
For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener. For fasteners that are designed to be countersunk, the measurement is made from the point on the head where the surface of the material is, to the end of the fastener.
What does CSK mean in screws?
Countersunk machine screws, also known as CSK screws have a flat head design so when placed in a pre-drilled countersunk hole they will sit flush with or below the surface of the surrounding material.
What is the counterbore symbol?
⌴
A counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature.
What size is a 3/16 screw?
US Machine Screw Diameters
| Size | Nominal Thread Diameter | |
|---|---|---|
| Decimal | Nearest Fractional | |
| #6 | 0.138″ | 9/64″ |
| #8 | 0.164″ | 5/32″ |
| #10 | 0.190″ | 3/16″ |
How is screw thickness measured?
To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.
What is a double countersunk screw?
What is a double countersunk screw head? Improved design on the countersunk head to give additional head strength and assist countersinking. COUNTERSUNK RIBBED HEAD. Small ribs on the countersink to assist completion of countersinking.
How do you size a countersink hole?
How to Choose the Right Size Countersink Diameter. You will want to choose a countersink that is larger than the bolt size of the hole. Countersink diameter = 1.5 x Bolt Size Hole Diameter. Example: 1/4″-20 Bolt – Multiple the diameter (.
How do you call a countersunk hole?
Place all of the dimensions for one feature in one view if possible. For instance, place the hole diameter and position dimension on the same view. Combine callouts. For countersunk holes, combine the through hole and countersinking callouts into one callout.