# TapDrill

> Tap drill sizes, drill bit charts and clearance holes. Inch threads (ASME B1.1, UNC/UNF): recommended drill is the standard drill closest to 75% thread, % thread = TPI x (major - drill) / 0.01299. Metric (ISO 261): tap drill = diameter - pitch, rounded to the nearest standard drill (DIN 336). Clearance holes: ISO 273.

## Inch tap drills
- [#0-80 UNF](https://tapdrill.pages.dev/tap/no-0-80/): 3/64 drill (0.0469 in, 1.19 mm), 81% thread
- [#1-64 UNC](https://tapdrill.pages.dev/tap/no-1-64/): #53 drill (0.0595 in, 1.51 mm), 67% thread
- [#1-72 UNF](https://tapdrill.pages.dev/tap/no-1-72/): #53 drill (0.0595 in, 1.51 mm), 75% thread
- [#2-56 UNC](https://tapdrill.pages.dev/tap/no-2-56/): #50 drill (0.0700 in, 1.78 mm), 69% thread
- [#2-64 UNF](https://tapdrill.pages.dev/tap/no-2-64/): #50 drill (0.0700 in, 1.78 mm), 79% thread
- [#3-48 UNC](https://tapdrill.pages.dev/tap/no-3-48/): #47 drill (0.0785 in, 1.99 mm), 76% thread
- [#3-56 UNF](https://tapdrill.pages.dev/tap/no-3-56/): #45 drill (0.0820 in, 2.08 mm), 73% thread
- [#4-40 UNC](https://tapdrill.pages.dev/tap/no-4-40/): #43 drill (0.0890 in, 2.26 mm), 71% thread
- [#4-48 UNF](https://tapdrill.pages.dev/tap/no-4-48/): #42 drill (0.0935 in, 2.38 mm), 68% thread
- [#5-40 UNC](https://tapdrill.pages.dev/tap/no-5-40/): #38 drill (0.1015 in, 2.58 mm), 72% thread
- [#5-44 UNF](https://tapdrill.pages.dev/tap/no-5-44/): #37 drill (0.1040 in, 2.64 mm), 71% thread
- [#6-32 UNC](https://tapdrill.pages.dev/tap/no-6-32/): #36 drill (0.1065 in, 2.71 mm), 78% thread
- [#6-40 UNF](https://tapdrill.pages.dev/tap/no-6-40/): #33 drill (0.1130 in, 2.87 mm), 77% thread
- [#8-32 UNC](https://tapdrill.pages.dev/tap/no-8-32/): #29 drill (0.1360 in, 3.45 mm), 69% thread
- [#8-36 UNF](https://tapdrill.pages.dev/tap/no-8-36/): #29 drill (0.1360 in, 3.45 mm), 78% thread
- [#10-24 UNC](https://tapdrill.pages.dev/tap/no-10-24/): #25 drill (0.1495 in, 3.80 mm), 75% thread
- [#10-32 UNF](https://tapdrill.pages.dev/tap/no-10-32/): #21 drill (0.1590 in, 4.04 mm), 76% thread
- [#12-24 UNC](https://tapdrill.pages.dev/tap/no-12-24/): #16 drill (0.1770 in, 4.50 mm), 72% thread
- [#12-28 UNF](https://tapdrill.pages.dev/tap/no-12-28/): #14 drill (0.1820 in, 4.62 mm), 73% thread
- [1/4-20 UNC](https://tapdrill.pages.dev/tap/1-4-20/): #7 drill (0.2010 in, 5.11 mm), 75% thread
- [1/4-28 UNF](https://tapdrill.pages.dev/tap/1-4-28/): #3 drill (0.2130 in, 5.41 mm), 80% thread
- [5/16-18 UNC](https://tapdrill.pages.dev/tap/5-16-18/): F drill (0.2570 in, 6.53 mm), 77% thread
- [5/16-24 UNF](https://tapdrill.pages.dev/tap/5-16-24/): I drill (0.2720 in, 6.91 mm), 75% thread
- [3/8-16 UNC](https://tapdrill.pages.dev/tap/3-8-16/): 5/16 drill (0.3125 in, 7.94 mm), 77% thread
- [3/8-24 UNF](https://tapdrill.pages.dev/tap/3-8-24/): Q drill (0.3320 in, 8.43 mm), 79% thread
- [7/16-14 UNC](https://tapdrill.pages.dev/tap/7-16-14/): U drill (0.3680 in, 9.35 mm), 75% thread
- [7/16-20 UNF](https://tapdrill.pages.dev/tap/7-16-20/): 25/64 drill (0.3906 in, 9.92 mm), 72% thread
- [1/2-13 UNC](https://tapdrill.pages.dev/tap/1-2-13/): 27/64 drill (0.4219 in, 10.72 mm), 78% thread
- [1/2-20 UNF](https://tapdrill.pages.dev/tap/1-2-20/): 29/64 drill (0.4531 in, 11.51 mm), 72% thread
- [9/16-12 UNC](https://tapdrill.pages.dev/tap/9-16-12/): 31/64 drill (0.4844 in, 12.30 mm), 72% thread
- [9/16-18 UNF](https://tapdrill.pages.dev/tap/9-16-18/): 33/64 drill (0.5156 in, 13.10 mm), 65% thread
- [5/8-11 UNC](https://tapdrill.pages.dev/tap/5-8-11/): 17/32 drill (0.5313 in, 13.49 mm), 79% thread
- [5/8-18 UNF](https://tapdrill.pages.dev/tap/5-8-18/): 37/64 drill (0.5781 in, 14.68 mm), 65% thread
- [3/4-10 UNC](https://tapdrill.pages.dev/tap/3-4-10/): 21/32 drill (0.6563 in, 16.67 mm), 72% thread
- [3/4-16 UNF](https://tapdrill.pages.dev/tap/3-4-16/): 11/16 drill (0.6875 in, 17.46 mm), 77% thread
- [7/8-9 UNC](https://tapdrill.pages.dev/tap/7-8-9/): 49/64 drill (0.7656 in, 19.45 mm), 76% thread
- [7/8-14 UNF](https://tapdrill.pages.dev/tap/7-8-14/): 13/16 drill (0.8125 in, 20.64 mm), 67% thread
- [1-8 UNC](https://tapdrill.pages.dev/tap/1-8/): 7/8 drill (0.8750 in, 22.23 mm), 77% thread
- [1-12 UNF](https://tapdrill.pages.dev/tap/1-12/): 59/64 drill (0.9219 in, 23.42 mm), 72% thread

## Metric tap drills
- [M1.6 x 0.35](https://tapdrill.pages.dev/tap/m1-6/): 1.25 mm drill; clearance fine/medium/coarse 1.7/1.8/2 mm
- [M2 x 0.4](https://tapdrill.pages.dev/tap/m2/): 1.6 mm drill; clearance fine/medium/coarse 2.2/2.4/2.6 mm
- [M2.5 x 0.45](https://tapdrill.pages.dev/tap/m2-5/): 2.05 mm drill; clearance fine/medium/coarse 2.7/2.9/3.1 mm
- [M3 x 0.5](https://tapdrill.pages.dev/tap/m3/): 2.5 mm drill; clearance fine/medium/coarse 3.2/3.4/3.6 mm
- [M3.5 x 0.6](https://tapdrill.pages.dev/tap/m3-5/): 2.9 mm drill; clearance fine/medium/coarse 3.7/3.9/4.2 mm
- [M4 x 0.7](https://tapdrill.pages.dev/tap/m4/): 3.3 mm drill; clearance fine/medium/coarse 4.3/4.5/4.8 mm
- [M5 x 0.8](https://tapdrill.pages.dev/tap/m5/): 4.2 mm drill; clearance fine/medium/coarse 5.3/5.5/5.8 mm
- [M6 x 1](https://tapdrill.pages.dev/tap/m6/): 5 mm drill; clearance fine/medium/coarse 6.4/6.6/7 mm
- [M8 x 1.25](https://tapdrill.pages.dev/tap/m8/): 6.8 mm drill; clearance fine/medium/coarse 8.4/9/10 mm
- [M10 x 1.5](https://tapdrill.pages.dev/tap/m10/): 8.5 mm drill; clearance fine/medium/coarse 10.5/11/12 mm
- [M12 x 1.75](https://tapdrill.pages.dev/tap/m12/): 10.2 mm drill; clearance fine/medium/coarse 13/13.5/14.5 mm
- [M14 x 2](https://tapdrill.pages.dev/tap/m14/): 12 mm drill; clearance fine/medium/coarse 15/15.5/16.5 mm
- [M16 x 2](https://tapdrill.pages.dev/tap/m16/): 14 mm drill; clearance fine/medium/coarse 17/17.5/18.5 mm
- [M18 x 2.5](https://tapdrill.pages.dev/tap/m18/): 15.5 mm drill; clearance fine/medium/coarse 19/20/21 mm
- [M20 x 2.5](https://tapdrill.pages.dev/tap/m20/): 17.5 mm drill; clearance fine/medium/coarse 21/22/24 mm
- [M22 x 2.5](https://tapdrill.pages.dev/tap/m22/): 19.5 mm drill; clearance fine/medium/coarse 23/24/26 mm
- [M24 x 3](https://tapdrill.pages.dev/tap/m24/): 21 mm drill; clearance fine/medium/coarse 25/26/28 mm
- [M27 x 3](https://tapdrill.pages.dev/tap/m27/): 24 mm drill; clearance fine/medium/coarse 28/30/32 mm
- [M30 x 3.5](https://tapdrill.pages.dev/tap/m30/): 26.5 mm drill; clearance fine/medium/coarse 31/33/35 mm
- [M8 x 1](https://tapdrill.pages.dev/tap/m8x1/): 7 mm drill; clearance fine/medium/coarse 8.4/9/10 mm
- [M10 x 1.25](https://tapdrill.pages.dev/tap/m10x1-25/): 8.8 mm drill; clearance fine/medium/coarse 10.5/11/12 mm
- [M10 x 1](https://tapdrill.pages.dev/tap/m10x1/): 9 mm drill; clearance fine/medium/coarse 10.5/11/12 mm
- [M12 x 1.5](https://tapdrill.pages.dev/tap/m12x1-5/): 10.5 mm drill; clearance fine/medium/coarse 13/13.5/14.5 mm
- [M12 x 1.25](https://tapdrill.pages.dev/tap/m12x1-25/): 10.8 mm drill; clearance fine/medium/coarse 13/13.5/14.5 mm
- [M14 x 1.5](https://tapdrill.pages.dev/tap/m14x1-5/): 12.5 mm drill; clearance fine/medium/coarse 15/15.5/16.5 mm
- [M16 x 1.5](https://tapdrill.pages.dev/tap/m16x1-5/): 14.5 mm drill; clearance fine/medium/coarse 17/17.5/18.5 mm
- [M18 x 1.5](https://tapdrill.pages.dev/tap/m18x1-5/): 16.5 mm drill; clearance fine/medium/coarse 19/20/21 mm
- [M20 x 1.5](https://tapdrill.pages.dev/tap/m20x1-5/): 18.5 mm drill; clearance fine/medium/coarse 21/22/24 mm
- [M22 x 1.5](https://tapdrill.pages.dev/tap/m22x1-5/): 20.5 mm drill; clearance fine/medium/coarse 23/24/26 mm
- [M24 x 2](https://tapdrill.pages.dev/tap/m24x2/): 22 mm drill; clearance fine/medium/coarse 25/26/28 mm

## Charts
- [Drill size chart (all types)](https://tapdrill.pages.dev/drill-size-chart/)
- [Inch tap drill chart (UNC/UNF)](https://tapdrill.pages.dev/tap-drill-chart/)
- [What percent of thread means](https://tapdrill.pages.dev/percent-of-thread/)
- [Fraction to decimal to mm chart](https://tapdrill.pages.dev/fraction-decimal-mm-chart/)
- [Metric clearance hole chart](https://tapdrill.pages.dev/clearance-hole-chart/)
- [Metric tap drill chart](https://tapdrill.pages.dev/metric-tap-drill-chart/)
- [How to tap a hole](https://tapdrill.pages.dev/how-to-tap-a-hole/)