Countersunk Holes In Sheet Metal

Sheet metal fabrications often need to have countersunk holes ready to take countersunk screws when being screwed together.

Countersunk holes in sheet metal.

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. In this video i go over punching countersunk holes in sheet metal with a unipunch. It inserts a circular hole if i duplicate the process on a standard extruded shape everything works as expected. The underside of the head is angled to sit flush within countersunk holes for use on heavy equipment such as plows.

A common use is to allow the head of a countersunk bolt screw or rivet when placed in the hole to sit flush with or below the surface of the surrounding material. Countersinking sheet metal products. Counterboring sheet metal product. May 2019 in general.

A countersink is a conical hole cut into a manufactured object. No c sink needed no metal removed from the sheet metal and more strength at the area of the screw head. 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. We offer 3 different styles of countersinking which is shown below.

Slide the screw into the countersunk hole and run your hand over the surface of the metal across the countersunk hole to feel whether the head of the screw protrudes above the surface of the metal. Figure 18 7 and table 18 5 give dimensions. Countersinking is commonly used for holes that need to accept a flat head screw or fastener. The basic requirement for countersunk head screws is that the head should fit into a countersunk hole with as great a degree of flushness as possible.

To achieve this it is necessary for both the head of the screw and the countersunk hole to be controlled within prescribed limits. There is another production method that can be employed which is to form the countersink shape in a cnc punch press or fly. Blunt screws for sheet metal. Hi the countersink routine does not produce a countersunk feature on my sheetmetal part.

Sheet metal countersunk hole issue. Tamper resistant torx flat head screws for sheet metal.