√画像をダウンロード 1/4-20 unc drill size 230064-1/4 20 unc drill size
3/8"16 UNC, AN5 Bolt View this chart for up to 1" drill sizes When using a drill bit for a feeler gauge, please remember that many drill bits are actually undersize at the shank end of the drill bit so please use the above bit sizes with a grain of salt!To help my readers out, I thought I would add this quick reference chart This should help whenever you run into a situation you need to drill a pilot hole and are not sure the size bit I also have included the chart for drill bit size per tap size In case you need to drill a hole and thread it for a screw or boltDrill and Counterbore Sizes for Socket Head Cap Screws per ASME B1 Dimension units in inches Related Socket Head Cap Head Screws Size Table Nom Size Screw Nom Size Screw Decimal Nominal Drill Size A Counterboore Diameter B Countersink C Note 1 Close Fit Note 2 Normal Fit Note 3 No or Fractional Size Decimal Unc 6 32 To 1 4 Hss Right Hand Thread Drill Tap Bit 1 4 Hex Shank Ebay 1/4 20 unc drill size