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Fractional Inch (1/X") |
Letter Drill Sizes (A-Z) |
Millimeter Std Sizes (0.5-25) |
Number Drill Sizes (1-80) |
| Inch (dia.) | Size | mm (dia.) | Tap Drill / Common Uses |
|---|
| 0.0059" | #97 | 0.15 | - |
| 0.0063" | #96 | 0.16 | - |
| 0.0067" | #95 | 0.17 | - |
| 0.0071" | #94 | 0.18 | - |
| 0.0075" | #93 | 0.19 | - |
| 0.0079" | #92 | 0.2 | - |
| 0.0083" | #91 | 0.211 | - |
| 0.0087" | #90 | 0.221 | - |
| 0.0091" | #89 | 0.231 | - |
| 0.0095" | #88 | 0.241 | - |
| 0.0098" | - | 0.25 | - |
| 0.01" | #87 | 0.254 | - |
| 0.0105" | #86 | 0.267 | - |
| 0.011" | #85 | 0.28 | - |
| 0.0115" | #84 | 0.292 | - |
| 0.0118" | - | 0.3 | - |
| 0.012" | #83 | 0.305 | - |
| 0.0125" | #82 | 0.318 | - |
| 0.0126" | - | 0.32 | - |
| 0.013" | #81 | 0.33 | - |
| 0.0135" | #80 | 0.3429 | - |
| 0.0145" | #79 | 0.3683 | - |
| 0.015625" | 1/64" | 0.3969 | #0 Wood Screw Pilot Drill Size (softwood) |
| 0.016" | #78 | 0.4064 | - |
| 0.018" | #77 | 0.4572 | - |
| 0.0197" | - | 0.5 | - |
| 0.02" | #76 | 0.508 | - |
| 0.021" | #75 | 0.5334 | - |
| 0.0225" | #74 | 0.5715 | - |
| 0.024" | #73 | 0.6096 | - |
| 0.025" | #72 | 0.635 | - |
| 0.026" | #71 | 0.6604 | - |
| 0.028" | #70 | 0.7112 | - |
| 0.0292" | #69 | 0.74168 | - |
| 0.0295" | - | 0.75 | Tap Drill Size for M1x.25 coarse |
| 0.031" | #68 | 0.7874 | - |
| 0.03125" | 1/32" | 0.7938 | #0 Wood Screw Pilot Drill Size (hardwood) #1 Wood Screw Pilot Drill Size (hard & softwood) #2 Wood Screw Pilot Drill Size (softwood) |
| 0.032" | #67 | 0.8128 | - |
| 0.033" | #66 | 0.8382 | - |
| 0.0335" | - | 0.85 | Tap Drill Size for M1.1x.25 coarse |
| 0.035" | #65 | 0.889 | - |
| 0.036" | #64 | 0.9144 | - |
| 0.037" | #63 | 0.9398 | - |
| 0.0374" | - | 0.95 | Tap Drill Size for M1.2x.25 coarse |
| 0.038" | #62 | 0.9652 | - |
| 0.039" | #61 | 0.9906 | - |
| 0.0394" | - | 1 | - |
| 0.04" | #60 | 1.016 | - |
| 0.041" | #59 | 1.0414 | - |
| 0.042" | #58 | 1.0668 | - |
| 0.043" | #57 | 1.0922 | - |
| 0.0433" | - | 1.1 | Tap Drill Size for M1.4x.3 coarse |
| 0.0465" | #56 | 1.1811 | - |
| 0.046875" | 3/64" | 1.1906 | Tap Drill Size for #0-80 UNF #2 Wood Screw Pilot Drill Size (hardwood) #3 Wood Screw Pilot Drill Size (softwood) #4 Wood Screw Pilot Drill Size (softwood) |
| 0.0492" | - | 1.25 | Tap Drill Size for M1.6x.35 coarse |
| 0.0512" | - | 1.3 | Tap Drill Size for M1.7x.35 coarse |
| 0.052" | #55 | 1.3208 | - |
| 0.055" | #54 | 1.397 | #3 Wood Screw Pilot Drill Size (hardwood) |
| " | #5 Wood Screw Pilot Drill Size (softwood) | ||
| 0.0571" | - | 1.45 | Tap Drill Size for M1.8x.35 coarse |
| 0.0591" | - | 1.5 | - |
| 0.0595" | #53 | 1.5113 | Tap Drill Size for #1-64 UNC and #1-72 UNF |
| 0.0625" | 1/16" | 1.5875 | #4 Wood Screw Pilot Drill Size (hardwood) #6 Wood Screw Pilot Drill Size (softwood) |
| 0.063" | - | 1.6 | Tap Drill Size for M2x.4 coarse |
| 0.0635" | #52 | 1.6129 | - |
| 0.067" | #51 | 1.7018 | - |
| 0.0689" | - | 1.75 | Tap Drill Size for M2.2x.45 coarse |
| 0.07" | #50 | 1.778 | Tap Drill Size for #2-64 UNF, #2-56 UNC |
| " | #7 Wood Screw Pilot Drill Size (softwood) | ||
| 0.073" | #49 | 1.8542 | - |
| 0.076" | #48 | 1.9304 | #5 Wood Screw Pilot Drill Size (hardwood) |
| 0.078125" | 5/64" | 1.9844 | #6 Wood Screw Pilot Drill Size (hardwood) #8 Wood Screw Pilot Drill Size (softwood) |
| 0.0785" | #47 | 1.9939 | Tap Drill Size for #3-48 UNC |
| 0.0787" | - | 2 | - |
| 0.0807" | - | 2.05 | Tap Drill Size for M2.5x.45 UNC |
| 0.081" | #46 | 2.0574 | #9 Wood Screw Pilot Drill Size (softwood) |
| " | #7 Wood Screw Pilot Drill Size (hardwood) | ||
| 0.082" | #45 | 2.0828 | Tap Drill Size for #3-56 UNF |
| 0.086" | #44 | 2.1844 | - |
| 0.089" | #43 | 2.2606 | Tap Drill Size for #4-40 UNC |
| 0.0935" | #42 | 2.3749 | Tap Drill Size for #4-48 UNF |
| 0.09375" | 3/32" | 2.3813 | #8 Wood Screw Pilot Drill Size (hardwood) #10 Wood Screw Pilot Drill Size (softwood) |
| 0.096" | #41 | 2.4384 | - |
| 0.098" | #40 | 2.4892 | - |
| 0.0984" | - | 2.5 | Tap Drill Size for M3x.5 coarse |
| 0.0995" | #39 | 2.5273 | #11 Wood Screw Pilot Drill Size (softwood) |
| " | #9 Wood Screw Pilot Drill Size (hardwood) | ||
| 0.1015" | #38 | 2.5781 | Tap Drill Size for #5-40 UNC |
| 0.104" | #37 | 2.6416 | Tap Drill Size for #5-44 UNF |
| 0.1065" | #36 | 2.7051 | Tap Drill Size for #6-32 UNC |
| 0.109375" | 7/64" | 2.7781 | #10 Wood Screw Pilot Drill Size (hardwood) #12 Wood Screw Pilot Drill Size (softwood) |
| 0.11" | #35 | 2.794 | - |
| 0.111" | #34 | 2.8194 | - |
| 0.113" | #33 | 2.8702 | Tap Drill Size for #6-40 UNF |
| 0.1142" | - | 2.9 | Tap Drill Size for M3.5x.6 coarse |
| 0.116" | #32 | 2.9464 | #11 Wood Screw Pilot Drill Size , (hardwood) |
| 0.1181" | - | 3 | - |
| 0.12" | #31 | 3.048 | - |
| 0.125" | 1/8" | 3.175 | #14 Wood Screw Pilot Drill Size (softwood) #12 Wood Screw Pilot Drill Size (hardwood) |
| 0.1285" | #30 | 3.2639 | - |
| 0.1299" | - | 3.3 | Tap Drill Size for M4x.7 coarse |
| 0.136" | #29 | 3.4544 | Tap Drill Size for #8-32 UNC, #8-36 UNF |
| 0.1378" | - | 3.5 | Tap Drill Size for M4x.5 Fine |
| 0.1405" | #28 | 3.5687 | - |
| 0.140625" | 9/64" | 3.5719 | #14 Wood Screw Pilot Drill Size (hardwood) #16 Wood Screw Pilot Drill Size (softwood) |
| 0.1417" | - | 3.6 | Tap Drill Size for M4x.35 Fine |
| 0.144" | #27 | 3.6576 | - |
| 0.1457" | - | 3.7 | Tap Drill Size for M4.5x.75 coarse |
| 0.147" | #26 | 3.7338 | - |
| 0.1495" | #25 | 3.7973 | Tap Drill Size for #10-24 UNC |
| 0.152" | #24 | 3.8608 | - |
| 0.154" | #23 | 3.9116 | - |
| 0.15625" | 5/32" | 3.9688 | #16 Wood Screw Pilot Drill Size (hardwood) |
| 0.157" | #22 | 3.9878 | - |
| 0.1575" | - | 4 | - |
| 0.159" | #21 | 4.0386 | Tap Drill Size for #10-32 UNF |
| 0.161" | #20 | 4.0894 | - |
| 0.1654" | - | 4.2 | Tap Drill Size for M5x.8 coarse |
| 0.166" | #19 | 4.2164 | - |
| 0.1695" | #18 | 4.3053 | - |
| 0.171875" | 11/64" | 4.3656 | - |
| 0.173" | #17 | 4.3942 | Tap Drill Size for #12-24 UNC |
| 0.177" | #16 | 4.4958 | - |
| 0.1772" | - | 4.5 | Tap Drill Size for M5x.5 Fine |
| 0.18" | #15 | 4.572 | Tap Drill Size for #12-28 UNF |
| 0.182" | #14 | 4.6228 | - |
| 0.185" | #13 | 4.699 | - |
| 0.1875" | 3/16" | 4.7625 | - |
| 0.189" | #12 | 4.8006 | - |
| 0.191" | #11 | 4.8514 | - |
| 0.1935" | #10 | 4.9149 | - |
| 0.196" | # 9 | 4.9784 | - |
| 0.1969" | - | 5 | Tap Drill Size for M6x1 coarse |
| 0.199" | # 8 | 5.0546 | - |
| 0.201" | # 7 | 5.1054 | Tap Drill Size for 1/4"-20 UNC |
| 0.203125" | 13/64" | 5.1594 | - |
| 0.204" | # 6 | 5.1816 | - |
| 0.2055" | # 5 | 5.2197 | - |
| 0.2067" | - | 5.25 | Tap Drill Size for M6x.75 Fine |
| 0.209" | # 4 | 5.3086 | - |
| 0.213" | # 3 | 5.4102 | Tap Drill Size for 1/4"-28 UNF |
| 0.2165" | - | 5.5 | Tap Drill Size for M6x.5 Fine |
| 0.21875" | 7/32" | 5.5563 | - |
| 0.221" | # 2 | 5.6134 | - |
| 0.228" | # 1 | 5.7912 | - |
| 0.234" | A | 5.9436 | - |
| 0.234375" | 15/64" | 5.9531 | - |
| 0.2362" | - | 6 | Tap Drill Size for M7x1 coarse |
| 0.238" | B | 6.0452 | - |
| 0.242" | C | 6.1468 | - |
| 0.246" | D | 6.2484 | Tap Drill Size for 1/16"-27 NPT |
| 0.2461" | - | 6.25 | Tap Drill Size for M7x.75 Fine |
| 0.25" | 1/4" | 6.35 | - |
| 0.25" | E | 6.35 | - |
| 0.2559" | - | 6.5 | - |
| 0.257" | F | 6.5278 | Tap Drill Size for 5/16"-18 UNC |
| 0.261" | G | 6.6294 | - |
| 0.265625" | 17/64" | 6.7469 | - |
| 0.266" | H | 6.7564 | - |
| 0.2677" | - | 6.8 | Tap Drill Size for M8x1.25 coarse |
| 0.272" | I | 6.9088 | Tap Drill Size for 5/16"-24 UNF |
| 0.2756" | - | 7 | Tap Drill Size for M8x.5 Fine |
| 0.277" | J | 7.0358 | - |
| 0.281" | K | 7.1374 | - |
| 0.28125" | 9/32" | 7.1438 | - |
| 0.2854" | - | 7.25 | Tap Drill Size for M8x.75 Fine |
| 0.29" | L | 7.366 | - |
| 0.295" | M | 7.493 | - |
| 0.2953" | - | 7.5 | Tap Drill Size for M8x1 Fine |
| 0.296875" | 19/64" | 7.5406 | - |
| 0.302" | N | 7.6708 | - |
| 0.3071" | - | 7.8 | Tap Drill Size for M9x1.25 coarse |
| 0.3125" | 5/16" | 7.9375 | Tap Drill Size for 3/8"-16 UNC |
| 0.315" | - | 8 | Tap Drill Size for M9x1 Fine |
| 0.316" | O | 8.0264 | - |
| 0.323" | P | 8.2042 | - |
| 0.328125" | 21/64" | 8.3344 | - |
| 0.332" | Q | 8.4328 | Tap Drill Size for 3/8"-24 UNF |
| 0.3346" | - | 8.5 | Tap Drill Size for M10x1.5 coarse |
| 0.339" | R | 8.6106 | Tap Drill Size for 1/8"-27 NPT |
| 0.34375" | 11/32" | 8.7313 | - |
| 0.3465" | - | 8.8 | Tap Drill Size for M10x1.25 Fine |
| 0.348" | S | 8.8392 | - |
| 0.3543" | - | 9 | Tap Drill Size for M10x1 Fine |
| 0.358" | T | 9.0932 | Tap Drill Size for 7/16"-14 UNC |
| 0.359375" | 23/64" | 9.1281 | - |
| 0.3642" | - | 9.25 | Tap Drill Size for M10x.75 Fine |
| 0.368" | U | 9.3472 | - |
| 0.374" | - | 9.5 | Tap Drill Size for M11x1.5 coarse |
| 0.375" | 3/8" | 9.525 | - |
| 0.377" | V | 9.5758 | - |
| 0.386" | W | 9.8044 | - |
| 0.390625" | 25/64" | 9.9219 | Tap Drill Size for 7/16"-20 UNF |
| 0.3937" | - | 10 | Tap Drill Size for M11x1 Fine |
| 0.397" | X | 10.0838 | - |
| 0.4016" | - | 10.2 | Tap Drill Size for M12x1.75 coarse |
| 0.404" | Y | 10.2616 | - |
| 0.40625" | 13/32" | 10.3188 | - |
| 0.413" | Z | 10.4902 | - |
| 0.4134" | - | 10.5 | Tap Drill Size for M12x1.5 Fine |
| 0.421875" | 27/64" | 10.7156 | Tap Drill Size for 1/2"-13 UNC |
| 0.4331" | - | 11 | Tap Drill Size for M12x1 Fine |
| 0.4375" | 7/16" | 11.1125 | Tap Drill Size for 1/4"-18 NPT |
| 0.4429" | - | 11.25 | Tap Drill Size for M12x.75 Fine |
| 0.4528" | - | 11.5 | - |
| 0.453125" | 29/64" | 11.5094 | Tap Drill Size for 1/2"-20 UNF |
| 0.46875" | 15/32" | 11.9063 | - |
| 0.4724" | - | 12 | Tap Drill Size for M14x2 coarse |
| 0.484375" | 31/64" | 12.3031 | Tap Drill Size for 9/16"-12 UNC |
| 0.4921" | - | 12.5 | Tap Drill Size for M14x1.5 Fine |
| 0.5" | 1/2" | 12.7 | - |
| 0.5039" | - | 12.8 | Tap Drill Size for M14x1.25 Fine |
| 0.5118" | - | 13 | Tap Drill Size for M14x1 Fine |
| 0.515625" | 33/64" | 13.0969 | Tap Drill Size for 9/16"-18 UNF |
| 0.53125" | 17/32" | 13.4938 | Tap Drill Size for 5/8"-11 UNC |
| 0.5315" | - | 13.5 | - |
| 0.546875" | 35/64" | 13.8906 | - |
| 0.5512" | - | 14 | Tap Drill Size for M16x2 coarse |
| 0.5625" | 9/16" | 14.2875 | Tap Drill Size for 5/8"-18 UNF |
| 0.5709" | - | 14.5 | Tap Drill Size for M16x1.5 Fine |
| 0.578125" | 37/64" | 14.6844 | Tap Drill Size for 3/8"-18 NPT |
| 0.5906" | - | 15 | Tap Drill Size for M16x1 Fine |
| 0.59375" | 19/32" | 15.0813 | - |
| 0.609375" | 39/64" | 15.4781 | - |
| 0.6102" | - | 15.5 | Tap Drill Size for M18x2.5 coarse |
| 0.625" | 5/8" | 15.875 | - |
| 0.6299" | - | 16 | Tap Drill Size for M18x2 Fine |
| 0.640625" | 41/64" | 16.2719 | Tap Drill Size for 3/4"-10 UNC |
| 0.6496" | - | 16.5 | - |
| 0.65625" | 21/32" | 16.6688 | - |
| 0.6693" | - | 17 | Tap Drill Size for M18x1 Fine |
| 0.671875" | 43/64" | 17.0656 | - |
| 0.6875" | 11/16" | 17.4625 | Tap Drill Size for 3/4"-16 UNF |
| 0.689" | - | 17.5 | Tap Drill Size for M20x2.5 coarse |
| 0.703125" | 45/64" | 17.8594 | Tap Drill Size for 1/2"-14 NPT |
| 0.7087" | - | 18 | Tap Drill Size for M20x2 Fine |
| 0.71875" | 23/32" | 18.2563 | - |
| 0.7283" | - | 18.5 | Tap Drill Size for M20x1.5 Fine |
| 0.734375" | 47/64" | 18.6531 | - |
| 0.748" | - | 19 | Tap Drill Size for M20x1 Fine |
| 0.75" | 3/4" | 19.05 | - |
| 0.765625" | 49/64" | 19.4469 | Tap Drill Size for 7/8"-9 UNC |
| 0.7677" | - | 19.5 | Tap Drill Size for M22x2.5 coarse |
| 0.78125" | 25/32" | 19.8438 | - |
| 0.7874" | - | 20 | Tap Drill Size for M22x2 Fine |
| 0.796875" | 51/64" | 20.2406 | - |
| 0.8071" | - | 20.5 | Tap Drill Size for M22x1.5 Fine |
| 0.8125" | 13/16" | 20.6375 | Tap Drill Size for 7/8"-14 UNF |
| 0.8268" | - | 21 | Tap Drill Size for M24x3 coarse Tap Drill Size for M22x1 Fine |
| 0.828125" | 53/64" | 21.0344 | - |
| 0.84375" | 27/32" | 21.4313 | - |
| 0.8465" | - | 21.5 | - |
| 0.859375" | 55/64" | 21.8281 | - |
| 0.8661" | - | 22 | Tap Drill Size for M24x2 Fine |
| 0.875" | 7/8" | 22.225 | Tap Drill Size for 1"-8 UNC |
| 0.8858" | - | 22.5 | Tap Drill Size for M24x1.5 Fine |
| 0.890625" | 57/64" | 22.6219 | - |
| 0.9055" | - | 23 | - |
| 0.90625" | 29/32" | 23.0188 | Tap Drill Size for 1"-12 UNF |
| 0.921875" | 59/64" | 23.4156 | Tap Drill Size for 3/4"-14 NPT |
| 0.9252" | - | 23.5 | - |
| 0.9375" | 15/16" | 23.8125 | - |
| 0.9449" | - | 24 | Tap Drill Size for M27x3 coarse |
| 0.953125" | 61/64" | 24.2094 | - |
| 0.9646" | - | 24.5 | Tap Drill Size for M26x1.5 Fine |
| 0.96875" | 31/32" | 24.6063 | - |
| 0.9843" | - | 25 | Tap Drill Size for M27x2 Fine |
| 0.984375" | 63/64" | 25.0031 | Tap Drill Size for 1-1/8"-7 UNC |
| 1" | 1" | 25.4 | - |