Drill Bit Size Chart | Fractional, Number, Letter & Metric Conversion

Home / Precision Math Hub / Drill & Tap Sizes Workshop Standard Drill Bit & Tap Size Reference Print Grid Drill Size Decimal (In) Metric (mm) Tap Size (SAE/Metric) #80 .0135 0.3429 - #56 .0465 1.1811 0-80 UNC 3/64 .0469 1.1906 - #53 .0595 1.5113 1-72 UNF / M1.6 #50 .0700 1.7780 2-56 UNC #47 .0785 1.9939 3-48 UNC / M2.5 #43 .0890 2.2606 4-40 UNC #36 .1065 2.7051 6-32 UNC / M3.5 #33 .1130 2.8702 6-40 UNF #29 .1360 3.4544 8-32 UNC / M4 #25 .1495 3.7973 10-24 UNC #21 .1590 4.0386 10-32 UNF / M5 #7 .2010 5.1054 1/4-20 UNC / M6 #3 .2130 5.4102 1/4-28 UNF Letter A .2340 5.9436 - Letter F .2570 6.5278 5/16-18 UNC / M8 Letter I .2720 6.9088 5/16-24 UNF Letter O .3160 8.0264 M10 x 1.5 Letter Q .3320 8.4328 3/8-16 UNC Letter U .3680 9.3472 7/16-14 UNC / M11 27/64 .4219 10.7156 1/2-13 UNC / M12 29/64 .4531 11.5094 1/2-20 UNF

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