|
Legend
|
| Fractional Inch |
| Letter Drill |
| Millimeters |
| Number Drill |
|
|
Millimeters
|
Inches
|
Designation
|
Tap Drill/Pilot
|
| .3429mm |
.0135" |
#80 |
|
| .3683mm |
.0145" |
#79 |
|
| .3969mm |
.015625" |
1/64" |
#0 Pilot, Soft-Wood |
| .4064mm |
.016" |
#78 |
|
| .4572mm |
.018" |
#77 |
|
| .5mm |
.0197" |
|
|
| .508mm |
.02" |
#76 |
|
| .5334mm |
.021" |
#75 |
|
| .5715mm |
.0225" |
#74 |
|
| .6096mm |
.024" |
#73 |
|
| .635mm |
.025" |
#72 |
|
| .6604mm |
.026" |
#71 |
|
| .7112mm |
.028" |
#70 |
|
| .74168mm |
.0292" |
#69 |
|
| .75mm |
.0295" |
|
M1x.25 coarse |
| .7874mm |
.031" |
#68 |
|
| .7938mm |
.03125" |
1/32" |
#0 Pilot, Hard-Wood
#1 Pilot, Hard & Soft-Wood
#2 Pilot, Soft-Wood |
| .8128mm |
.032" |
#67 |
|
| .8382mm |
.033" |
#66 |
|
| .85mm |
.0335" |
|
M1.1x.25 coarse |
| .889mm |
.035" |
#65 |
|
| .9144mm |
.036" |
#64 |
|
| .9398mm |
.037" |
#63 |
|
| .95mm |
.0374" |
|
M1.2x.25 coarse |
| .9652mm |
.038" |
#62 |
|
| .9906mm |
.039" |
#61 |
|
| 1mm |
.0394" |
|
|
| 1.016mm |
.04" |
#60 |
|
| 1.0414mm |
.041" |
#59 |
|
| 1.0668mm |
.042" |
#58 |
|
| 1.0922mm |
.043" |
#57 |
|
| 1.1mm |
.0433" |
|
M1.4x.3 coarse |
| 1.1811mm |
.0465" |
#56 |
|
| 1.1906mm |
.046875" |
3/64" |
#0-80 UNF
#2 Pilot, Hard-wood
#3 Pilot, Soft-Wood
#4 Pilot, Soft-Wood |
| 1.25mm |
.0492" |
|
M1.6x.35 coarse |
| 1.3mm |
.0512" |
|
M1.7x.35 coarse |
| 1.3208mm |
.052" |
#55 |
|
| 1.397mm |
.055" |
#54 |
|
| 1.45mm |
.0571" |
|
M1.8x.35 coarse |
| 1.5mm |
.0591" |
|
|
| 1.5113mm |
.0595" |
#53 |
#1-64 UNC
#1-72 UNF |
| 1.5875mm |
.0625" |
1/16" |
#0 Wood Shank Hole
#3 Pilot, Hard-Wood
#4 Pilot, Hard-wood
#5 Pilot, Soft-wood
#6 Pilot, Soft-wood
#7 Pilot, Soft-wood |
| 1.6mm |
.063" |
|
M2x.4 coarse |
| 1.6129mm |
.0635" |
#52 |
|
| 1.7018mm |
.067" |
#51 |
|
| 1.75mm |
.0689" |
|
M2.2x.45 coarse |
| 1.778mm |
.07" |
#50 |
#2-64 UNF
#2-56 UNC |
| 1.8542mm |
.073" |
#49 |
|
| 1.9304mm |
.076" |
#48 |
|
| 1.9844mm |
.078125" |
5/64" |
#1 Wood Shank Hole
#5 Pilot, Hard-wood
#6 Pilot, Hard-wood
#8 Pilot, Soft-wood
#9 Pilot, Soft-wood |
| 1.9939mm |
.0785" |
#47 |
#3-48 UNC |
| 2mm |
.0787" |
|
|
| 2.05mm |
.0807" |
|
M2.5x.45 coarse |
| 2.0574mm |
.081" |
#46 |
|
| 2.0828mm |
.082" |
#45 |
#3-56 UNF |
| 2.1844mm |
.086" |
#44 |
|
| 2.2606mm |
.089" |
#43 |
#4-40 UNC |
| 2.3749mm |
.0935" |
#42 |
#4-48 UNF |
| 2.3813mm |
.09375" |
3/32" |
#2 Wood Shank Hole
#7 Pilot, Hard-wood
#8 Pilot, Hard-wood
#10 Pilot, Soft-wood
#11 Pilot, Soft-wood |
| 2.4384mm |
.096" |
#41 |
|
| 2.4892mm |
.098" |
#40 |
|
| 2.5mm |
.0984" |
|
M3x.5 coarse |
| 2.5273mm |
.0995" |
#39 |
|
| 2.5781mm |
.1015" |
#38 |
#5-40 UNC |
| 2.6416mm |
.104" |
#37 |
#5-44 UNF |
| 2.7051mm |
.1065" |
#36 |
#6-32 UNC |
| 2.7781mm |
.109375" |
7/64" |
#3 Wood Shank Hole
#4 Wood Shank Hole
#9 Pilot, Hard-wood
#10 Pilot, Hard-wood
#12 Pilot, Soft-wood
#14 Pilot, Soft-wood |
| 2.794mm |
.11" |
#35 |
|
| 2.8194mm |
.111" |
#34 |
|
| 2.8702mm |
.113" |
#33 |
#6-40 UNF |
| 2.9mm |
.1142" |
|
M3.5x.6 coarse |
| 2.9464mm |
.116" |
#32 |
|
| 3mm |
.1181" |
|
|
| 3.048mm |
.12" |
#31 |
|
| 3.175mm |
.125" |
1/8" |
#5 Wood Shank Hole
#11 Pilot, Hard-wood
#12 Pilot, Hard-wood |
| 3.2639mm |
.1285" |
#30 |
|
| 3.3mm |
.1299" |
|
M4x.7 coarse |
| 3.4544mm |
.136" |
#29 |
#8-32 UNC
#8-36 UNF |
| 3.5mm |
.1378" |
|
M4x.5 Fine |
| 3.5687mm |
.1405" |
#28 |
|
| 3.5719mm |
.140625" |
9/64" |
#6 Wood Shank Hole
#14 Pilot, Hard-wood
#16 Pilot, Soft-wood
#18 Pilot, Soft-wood |
| 3.6mm |
.1417" |
|
M4x.35 Fine |
| 3.6576mm |
.144" |
#27 |
|
| 3.7mm |
.1457" |
|
M4.5x.75 coarse |
| 3.7338mm |
.147" |
#26 |
|
| 3.7973mm |
.1495" |
#25 |
#10-24 UNC |
| 3.8608mm |
.152" |
#24 |
|
| 3.9116mm |
.154" |
#23 |
|
| 3.9688mm |
.15625" |
5/32" |
#7 Wood Shank Hole
#16 Pilot, Hard-wood |
| 3.9878mm |
.157" |
#22 |
|
| 4mm |
.1575" |
|
|
| 4.0386mm |
.159" |
#21 |
#10-32 UNF |
| 4.0894mm |
.161" |
#20 |
|
| 4.2mm |
.1654" |
|
M5x.8 coarse |
| 4.2164mm |
.166" |
#19 |
|
| 4.3053mm |
.1695" |
#18 |
|
| 4.3656mm |
.171875" |
11/64" |
#8 Wood Shank Hole
#20 Pilot, Soft-wood |
| 4.3942mm |
.173" |
#17 |
#12-24 UNC |
| 4.4958mm |
.177" |
#16 |
|
| 4.5mm |
.1772" |
|
M5x.5 Fine |
| 4.572mm |
.18" |
#15 |
#12-28 UNF |
| 4.6228mm |
.182" |
#14 |
|
| 4.699mm |
.185" |
#13 |
|
| 4.7625mm |
.1875" |
3/16" |
#9 Wood Shank Hole
#10 Wood Shank Hole
#18 Pilot, Hard-wood |
| 4.8006mm |
.189" |
#12 |
|
| 4.8514mm |
.191" |
#11 |
|
| 4.9149mm |
.1935" |
#10 |
|
| 4.9784mm |
.196" |
# 9 |
|
| 5mm |
.1969" |
|
M6x1 coarse |
| 5.0546mm |
.199" |
# 8 |
|
| 5.1054mm |
.201" |
# 7 |
¼"-20 UNC |
| 5.1594mm |
.203125" |
13/64" |
#11 Wood Shank Hole
#20 Pilot, Hard-wood |
| 5.1816mm |
.204" |
# 6 |
|
| 5.2197mm |
.2055" |
# 5 |
|
| 5.25mm |
.2067" |
|
M6x.75 Fine |
| 5.3086mm |
.209" |
# 4 |
|
| 5.4102mm |
.213" |
# 3 |
¼"-28 UNF |
| 5.5mm |
.2165" |
|
M6x.5 Fine |
| 5.5563mm |
.21875" |
7/32" |
#12 Wood Shank Hole |
| 5.6134mm |
.221" |
# 2 |
|
| 5.7912mm |
.228" |
# 1 |
|
| 5.9436mm |
.234" |
A |
|
| 5.9531mm |
.234375" |
15/64" |
|
| 6mm |
.2362" |
|
M7x1 coarse |
| 6.0452mm |
.238" |
B |
|
| 6.1468mm |
.242" |
C |
|
| 6.2484mm |
.246" |
D |
1/16"-27 NPT |
| 6.25mm |
.2461" |
|
M7x.75 Fine |
| 6.35mm |
.25" |
1/4" |
#14 Wood Shank Hole |
| 6.35mm |
.25" |
E |
|
| 6.5mm |
.2559" |
|
|
| 6.5278mm |
.257" |
F |
5/16"-18 UNC |
| 6.6294mm |
.261" |
G |
|
| 6.7469mm |
.265625" |
17/64" |
#16 Wood Shank Hole |
| 6.7564mm |
.266" |
H |
|
| 6.8mm |
.2677" |
|
M8x1.25 coarse |
| 6.9088mm |
.272" |
I |
5/16"-24 UNF |
| 7mm |
.2756" |
|
M8x.5 Fine |
| 7.0358mm |
.277" |
J |
|
| 7.1374mm |
.281" |
K |
|
| 7.1438mm |
.28125" |
9/32" |
|
| 7.25mm |
.2854" |
|
M8x.75 Fine |
| 7.366mm |
.29" |
L |
|
| 7.493mm |
.295" |
M |
|
| 7.5mm |
.2953" |
|
M8x1 Fine |
| 7.5406mm |
.296875" |
19/64" |
#18 Wood Shank Hole |
| 7.6708mm |
.302" |
N |
|
| 7.8mm |
.3071" |
|
M9x1.25 coarse |
| 7.9375mm |
.3125" |
5/16" |
3/8"-16 UNC |
| 8mm |
.315" |
|
M9x1 Fine |
| 8.0264mm |
.316" |
O |
|
| 8.2042mm |
.323" |
P |
|
| 8.3344mm |
.328125" |
21/64" |
#20 Wood Shank Hole |
| 8.4328mm |
.332" |
Q |
3/8"-24 UNF |
| 8.5mm |
.3346" |
|
M10x1.5 coarse |
| 8.6106mm |
.339" |
R |
1/8"-27 NPT |
| 8.7313mm |
.34375" |
11/32" |
|
| 8.8mm |
.3465" |
|
M10x1.25 Fine |
| 8.8392mm |
.348" |
S |
|
| 9mm |
.3543" |
|
M10x1 Fine |
| 9.0932mm |
.358" |
T |
7/16"-14 UNC |
| 9.1281mm |
.359375" |
23/64" |
|
| 9.25mm |
.3642" |
|
M10x.75 Fine |
| 9.3472mm |
.368" |
U |
|
| 9.5mm |
.374" |
|
M11x1.5 coarse |
| 9.525mm |
.375" |
3/8" |
|
| 9.5758mm |
.377" |
V |
|
| 9.8044mm |
.386" |
W |
|
| 9.9219mm |
.390625" |
25/64" |
7/16"-20 UNF |
| 10mm |
.3937" |
|
M11x1 Fine |
| 10.0838mm |
.397" |
X |
|
| 10.2mm |
.4016" |
|
M12x1.75 coarse |
| 10.2616mm |
.404" |
Y |
|
| 10.3188mm |
.40625" |
13/32" |
|
| 10.4902mm |
.413" |
Z |
|
| 10.5mm |
.4134" |
|
M12x1.5 Fine |
| 10.7156mm |
.421875" |
27/64" |
½"-13 UNC |
| 11mm |
.4331" |
|
M12x1 Fine |
| 11.1125mm |
.4375" |
7/16" |
¼"-18 NPT |
| 11.25mm |
.4429" |
|
M12x.75 Fine |
| 11.5mm |
.4528" |
|
|
| 11.5094mm |
.453125" |
29/64" |
½"-20 UNF |
| 11.9063mm |
.46875" |
15/32" |
|
| 12mm |
.4724" |
|
M14x2 coarse |
| 12.3031mm |
.484375" |
31/64" |
9/16"-12 UNC |
| 12.5mm |
.4921" |
|
M14x1.5 Fine |
| 12.7mm |
.5" |
1/2" |
|
| 12.8mm |
.5039" |
|
M14x1.25 Fine |
| 13mm |
.5118" |
|
M14x1 Fine |
| 13.0969mm |
.515625" |
33/64" |
9/16"-18 UNF |
| 13.4938mm |
.53125" |
17/32" |
5/8"-11 UNC |
| 13.5mm |
.5315" |
|
|
| 13.8906mm |
.546875" |
35/64" |
|
| 14mm |
.5512" |
|
M16x2 coarse |
| 14.2875mm |
.5625" |
9/16" |
5/8"-18 UNF |
| 14.5mm |
.5709" |
|
M16x1.5 Fine |
| 14.6844mm |
.578125" |
37/64" |
3/8"-18 NPT |
| 15mm |
.5906" |
|
M16x1 Fine |
| 15.0813mm |
.59375" |
19/32" |
|
| 15.4781mm |
.609375" |
39/64" |
|
| 15.5mm |
.6102" |
|
M18x2.5 coarse |
| 15.875mm |
.625" |
5/8" |
|
| 16mm |
.6299" |
|
M18x2 Fine |
| 16.2719mm |
.640625" |
41/64" |
¾"-10 UNC |
| 16.5mm |
.6496" |
|
|
| 16.6688mm |
.65625" |
21/32" |
|
| 17mm |
.6693" |
|
M18x1 Fine |
| 17.0656mm |
.671875" |
43/64" |
|
| 17.4625mm |
.6875" |
11/16" |
¾"-16 UNF |
| 17.5mm |
.689" |
|
M20x2.5 coarse |
| 17.8594mm |
.703125" |
45/64" |
½"-14 NPT |
| 18mm |
.7087" |
|
M20x2 Fine |
| 18.2563mm |
.71875" |
23/32" |
|
| 18.5mm |
.7283" |
|
M20x1.5 Fine |
| 18.6531mm |
.734375" |
47/64" |
|
| 19mm |
.748" |
|
M20x1 Fine |
| 19.05mm |
.75" |
3/4" |
|
| 19.4469mm |
.765625" |
49/64" |
7/8"-9 UNC |
| 19.5mm |
.7677" |
|
M22x2.5 coarse |
| 19.8438mm |
.78125" |
25/32" |
|
| 20mm |
.7874" |
|
M22x2 Fine |
| 20.2406mm |
.796875" |
51/64" |
|
| 20.5mm |
.8071" |
|
M22x1.5 Fine |
| 20.6375mm |
.8125" |
13/16" |
7/8"-14 UNF |
| 21mm |
.8268" |
|
M24x3 coarse
M22x1 Fine |
| 21.0344mm |
.828125" |
53/64" |
|
| 21.4313mm |
.84375" |
27/32" |
|
| 21.5mm |
.8465" |
|
|
| 21.8281mm |
.859375" |
55/64" |
|
| 22mm |
.8661" |
|
M24x2 Fine |
| 22.225mm |
.875" |
7/8" |
1"-8 UNC |
| 22.5mm |
.8858" |
|
M24x1.5 Fine |
| 22.6219mm |
.890625" |
57/64" |
|
| 23mm |
.9055" |
|
|
| 23.0188mm |
.90625" |
29/32" |
1"-12 UNF |
| 23.4156mm |
.921875" |
59/64" |
¾"-14 NPT |
| 23.5mm |
.9252" |
|
|
| 23.8125mm |
.9375" |
15/16" |
|
| 24mm |
.9449" |
|
M27x3 coarse |
| 24.2094mm |
.953125" |
61/64" |
|
| 24.5mm |
.9646" |
|
M26x1.5 Fine |
| 24.6063mm |
.96875" |
31/32" |
|
| 25mm |
.9843" |
|
M27x2 Fine |
| 25.0031mm |
.984375" |
63/64" |
1-1/8"-7 UNC |
| 25.4mm |
1.000" |
1" |
|
| 25.5mm |
1.0039" |
|
M27x1.5 Fine |
| 26.5mm |
1.0433" |
|
M30x3.5 coarse |
| 26.5mm |
1.0433" |
|
M28x1.5 Fine |
| 26.5906mm |
1.046875" |
1-3/64" |
1-1/8"-12 UNF |
| 26.9875mm |
1.0625" |
1-1/16" |
|
| 28mm |
1.1024" |
|
M30x2 Fine |
| 28.1781mm |
1.109375" |
1-7/64" |
1¼"-7 UNC |
| 28.5mm |
1.122" |
|
M30x1.5 Fine |
| 28.575mm |
1.125" |
1-1/8" |
|
| 29.3688mm |
1.15625" |
1-5/32" |
1"-11½ NPT |
| 29.5mm |
1.1614" |
|
M33x3.5 coarse |
| 29.7656mm |
1.171875" |
1-11/64" |
1¼"-12 UNF |
| 30.1625mm |
1.1875" |
1-3/16" |
|
| 31mm |
1.2205" |
|
M33x2 Fine |
| 32mm |
1.2598" |
|
M36x4 coarse |
| 33mm |
1.2992" |
|
M36x3 Fine |
| 34.1313mm |
1.34375" |
1-11/32" |
1½"-6 UNC |
| 34.925mm |
1.375" |
1-3/8" |
|
| 35mm |
1.378" |
|
M39x4 coarse |
| 36mm |
1.4173" |
|
M39x3 Fine |
| 36.1156mm |
1.421875" |
1-27/64" |
1½"-12 UNF |
| 36.5125mm |
1.4375" |
1-7/16" |
|
| 38.1mm |
1.5" |
1½" |
1¼"-11½ NPT |
| 39.2906mm |
1.546875" |
1-35/64" |
1¾"-5 UNC |
| 39.6875mm |
1.5625" |
1-9/16" |
|
| 41.275mm |
1.625" |
1-5/8" |
|
| 42.4656mm |
1.671875" |
1-43/64" |
1¾"-12 UNF |
| 44.0531mm |
1.734375" |
1-47/64" |
1½"-11½ NPT |
| 44.45mm |
1.75" |
1-3/4" |
|
| 45.2438mm |
1.78125" |
1-25/32" |
2"-4½ UNC |
| 46.0375mm |
1.8125" |
1-13/16" |
|
| 47.625mm |
1.875" |
1-7/8" |
|
| 48.8156mm |
1.921875" |
1-59/64" |
2"-12 UNF |
| 49.2125mm |
1.9375" |
1-15/16" |
|
| 56.3563mm |
2.21875" |
2-7/32" |
2"-11½ NPT |
| 66.675mm |
2.625" |
2-5/8" |
2½-8 NPT |
| 82.55mm |
3.25" |
3¼" |
3"-8 NPT |
| 88.9mm |
3.5" |
3¾" |
3½"-8 NPT |
| 107.95mm |
4.25" |
4¼ |
4"-8 NPT |
|
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