3/13/2023 0 Comments Technical drawing holesThey are used for applications where the bolt or screw must sit beneath the surface.įor example, in applications where there isn’t space for a hex-head bolt to be used due to clearance issues:Ī washer may also be present underneath the socket-head screw. What Are Counterbored Holes Used For?Ĭounterbores are machined for socket-head screws. You can find out what size counterbore you need by looking at a chart such as this one. The counterbore example above was for an M20 socket-head bolt with normal clearance. That’s why there isn’t a ‘Through’ or a dimension after the pilot hole diameter, because it is assumed it goes all the way through.Ī ‘pilot hole’ is a small diameter hole, usually the first hole to be drilled. Note for counterbored holes that the pilot hole usually goes completely through the component. The bottom view explains what the counterbore dimensions are showing. The top view shows how counterbored holes are shown on drawings. How Are Counterbores Shown on Engineering Drawings?Ĭounterbored holes are shown on engineering drawings as follows: The symbol used for a counterbore is ‘⌴’.
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