【印刷可能】 1/4-20 unc drill size in mm 211826-Drill size for 1/4 unc thread
Size DIA Close Fit NonStruct (1/64 OS) 080UNF 3/ No 53 5/64;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!Tap size NF/NC UNF/UNC Threads per inch Basic major dia (inches) Basic effective dia (inches) Basic minor dia of ext threads (inches) Basic minor dia of int threads (inches) Irwin Hanson 4 40 To 1 2 Bsp Metric Coarse Metric Fine Npt Unc Unf Die And Drill Set Msc Industrial Supply Drill size for 1/4 unc thread