First, measure the diameter with a Vernier caliper. Choose the closest reading screw size on a screw thread gauge. To measure the depth of the hole, place a toothpick into the hole and mark it. Then measure the length of the tip to the mark.

How do you match a screw to a hole?

Examine drill bits until you find one that looks about the same diameter as the root of the screw. The root is the center shaft, not including the threads which stick out. Hold the drill against the screw and compare their diameters closely.

How do I know what size hole I need for a screw?

The drill bit should be the same size as the shaft of the screw without accounting for the threads. To do this, simply line up a screw side by side with the drill bit. If they’re the same size, then you’re good to go.

How can you tell what thread a hole is?

Quote from the video:
Quote from Youtube video: There you take the size of the bolt. M10 right there. And you subtract the pitch. 1.0. So for this one it would be 9 millimeters.

How do you match a drill bit to a screw?

Hold the shaft of the drill bit up in front of the screw. You should only be able to see the threads of the screw (and maybe a bit of the screw). If you can’t see the threads the drill bit is too big. If you can see too much of the screw, the bit is too small.

How do you measure a hole for a drill?

Quote from the video:
Quote from Youtube video: If you're not sure if it's the right size you can switch the direction to see if the shaft of the screw covers up the shaft of the drill. Bit.

How do I choose the right drill bit?

How to Choose Drill Bits by Size

  1. Use a bit 1/64” smaller than the target hole size for softwoods.
  2. Use a bit exactly the same size as the hole when working on other materials.
  3. If you’re not sure which to select, choose a drill bit 1/64” larger than the hole you wish to create.

How do you choose the right size drill bit for an anchor?

To get the right-size hole, measure the shank of the drill bit against the front of the anchor — its diameter should be the same size or 1/16 inch more than that to make the opening for the screw. If the diameter of the anchor is displayed on the packaging, drill the hole with a bit of the same diameter.