Countersunk Hole Sheet Metal

By just tightening the rapid load holder sold separately into your drill or drill driver you can quickly insert or eject hex shank drill bits and screw driving tips as necessary.

Countersunk hole sheet metal.

Improper countersink through hole sizes. Creating a countersink in the metal allows the head of the screw to rest below the surface of the metal and provides the full structural strength of the screw. A countersink screw has a taper that is largest at the head and reduces in size until it reaches the threaded shaft of the screw. Depending on part configuration material type and thickness countersink size etc we can employ two methods of adding countersinks to parts.

Sheet metal fabrications often need to have countersunk holes ready to take countersunk screws when being screwed together. Sheet metal countersink chart choose from a variety of standard countersink options which can either be formed or machined into sheet part parts. This month we will discuss another common issues that we encounter on sheet metal part prints. In this video i go over punching countersunk holes in sheet metal with a unipunch.

After drilling a hole in the table for the screw you will be using and the matching hole in the sheet metal use this punch to make a depression in the sheet metal so the screw head sits below the surface of the sheet metal. When placing an order or requesting a quote please specify the required dimensions based on the diagrams shown on the right side of the picture for each style. Note that no metal was removed to create the countersunk hole other than the hole itself. Countersunk holes made with a large number of flutes and cutting edges to lightly shear off material these tools repair and clean out holes for machining between centers.

We offer 3 different styles of countersinking which is shown below. These were created with a dimple die punch which could create a countersunk hole through multiple sheets of aluminum. No c sink needed no metal removed from the sheet metal and more strength at the area of the screw head. There is another production method that can be employed which is to form the countersink shape in a cnc punch press or fly press.

Countersinking is commonly used for holes that need to accept a flat head screw or fastener. Machined countersinks are created with a drill press and formed countersinks are made with punch press tooling the best option depends on your project and part geometry.