If you are using #10 hammer drive or U-drive screws, the recommended drill bit size for your pilot hole is #20. When your project uses hardwood or softwood, a standard #10 wood screw is suitable for the fastening work. You'd use a 9/64-inch bit for a straight pilot hole, although some softwoods might benefit from having a 1/8-inch bit.. Measure the Screw Diameter: In your case, you mentioned a 5mm wood screw. Calculate Pilot Hole Size: The general rule of thumb is to use a pilot hole that is about 75-80% of the screw diameter. So, for a 5mm screw, you'd calculate it as follows: 5mm x 0.75 = 3.75mm. 5mm x 0.80 = 4mm. You have a range of 3.75mm to 4mm for the pilot hole diameter.

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13/64. 24. 0.372. 3/8. 3/16. 7/32. Table of sizes of pilot holes in hardwood and softwood for American wood screws.. For the screws, you must use recommended pilot hole depth according to the nominal diameter of the metal. In most cases, screw pilot holes are not prepared in metals. If there is a special design or case screws, pilot holes can be created in the metal. 2. Pilot Hole Depth for Wood. These are the pilot hole depth for the wood.