Countersunk Holes In Sheet Metal

Countersinking is commonly used for holes that need to accept a flat head screw or fastener.

Countersunk holes in sheet metal.

Figure 18 7 and table 18 5 give dimensions. There is another production method that can be employed which is to form the countersink shape in a cnc punch press or fly. Sheet metal countersunk hole issue. 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.

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. May 2019 in general. No c sink needed no metal removed from the sheet metal and more strength at the area of the screw head. We offer 3 different styles of countersinking which is shown below.

Countersinking sheet metal products. In this video i go over punching countersunk holes in sheet metal with a unipunch. If the head of the screw does not rest below the surface of the metal withdraw the screw from the hole and run the countersink drill bit deeper. Tamper resistant torx flat head screws for sheet metal.

To achieve this it is necessary for both the head of the screw and the countersunk hole to be controlled within prescribed limits. It inserts a circular hole if i duplicate the process on a standard extruded shape everything works as expected. Made from 18 8 stainless steel these screws are chemical resistant. 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.

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. Sheet metal fabrications often need to have countersunk holes ready to take countersunk screws when being screwed together. The underside of the head is angled to sit flush within countersunk holes for use on heavy equipment such as plows. A countersink is a conical hole cut into a manufactured object.

These countersinks have always been drilled in with standard pillar drills or counter bits. Hi the countersink routine does not produce a countersunk feature on my sheetmetal part.