Appx F - Drill Chart

Decimal Equivalent Chart

Decimal Equivalent

Drill Size

mm

TapSize

.0059970.150 
.0063960.160 
.0067950.170 
.0071940.180 
.0075960.191 
.0079920.201 
.0083910.211 
.0087900.221 
.0091890.231 
.0095880.241 
.0100870.254 
.0105860.267 
.0110850.279 
.0115840.292 
.0120830.305 
.0125820.318 
.0130810.330 
.0135800.343 
.0145790.368 
.01561/640.397 
.0160780.406 
.0180770.457 
.0200760.508 
.0210750.533 
.0225740.572 
.0240730.610 
.0250720.635 
.0260710.660 
.0280700.711 
.0292690.742 
.0310680.787 
.03131/320.794 
.0320670.813 
.0330660.838 
.0350650.889 
.0360640.914 
.0370630.940 
.0380620.965 
.0390610.991 
.0400601.016 
.0410591.041 
.0420581.067 
.0430571.092 
.0465561.181 
.04693/641.191#0-80
.0520551.321 
.0550541.397 
.0595531.511#1-64
#1-72
.06251/161.588 
.0635521.613 
.0670511.702 
.0700501.778#2-56
#2-64
.0730491.854 
.0760481.930 
.07815/641.984 
.0785471.994#3-48
.0810462.057 
.0820452.083#3-56
.0860442.184 
.0890432.261#4-40
.0935422.375#4-48
.09383/322.381 
.0960412.438 
.0980402.489 
.0995392.527 
.1015382.578#5-40
.1040372.642#5-44
.1065362.705#6-32
.10947/642.778 
.1100352.794 
.1110342.819 
.1130332.870#6-40
.1160322.946 
.1200313.048 
.12501/83.175 
.1285303.264 
.1360293.454#8-32
#8-36
.1405283.569 
.14069/643.572 
.1440273.658 
.1470263.734 
.1495253.797 
.1520243.861 
.1540233.912 
.15635/323.969 
.1570223.988 
.1590214.039#10-32
.1610204.089 
.1660194.216 
.1695184.305 
.171911/644.366 
.1730174.394 
.1770164.496 
.1800154.572 
.1820144.623 
.1850134.699 
.18753/164.763#12-32
.1890124.801 
.1910114.851 
.1935104.915 
.196094.978 
.199085.055 
.201075.105¼-20
.203113/644.159 
.204065.182 
.205555.220 
.209045.309 
.213035.410¼-28
.21887/325.556 
.221025.613 
.228015.791 
.2340A5.944 
.234415/645.953 
.2380B6.045 
.2420C6.147 
.2460D6.248 
.2500¼ & E6.350 
.2570F6.5285/16-18
.2610G6.629 
.265617/646.747 
.2660H6.756 
.2720I6.9095/16-24
.2770J7.036 
.2810K7.137 
.28139/327.1445/16-32
.2900L7.366 
.2950M7.493 
.296919/647.541 
.3020N7.671 
.31255/167.9383/8-16
.3160O8.026 
.3230P8.204 
.328121/648.334 
.3320Q8.4333/8-24
.3390R8.611 
.343811/328.7313/8-32
.3480S8.839 
.3580T9.093 
.359423/649.128 
.3680U9.3477/16-14
.37503/89.525 
.3770V9.576 
.3860W9.804 
.390625/649.9227/16-20
.3970X10.084 
.4040Y10.2627/16-28
.406313/3210.319 
.4130Z10.490 
.421927/6410.716½-13
.43757/1611.113 
.453129/6411.509½-20
.468815/3211.906½-28
.484431/6412.3039/16-12
.5000½12.7009/16-18
.515633/6413.0979/16-24
.531317/3213.4945/8-11
.546935/6413.891 
.56259/1614.2885/8-18
.578137/6414.6845/8-24
.593819/3215.081 
.609439/6415.47811/16-12
.62505/815.875 
.640641/6416.27211/16-20
11/16-24
.656331/3216.669¾-10
.671941/6417.066 
.687511/1617.462¾-16
.703145/6417.859¾-20
.718823/3218.256 
.734447/6418.65313/16-12
.7500¾19.05013/16-16
.765649/6419.44713/16-20
7/8-9
.781325/3219.844 
.796951/6420.2417/8-14
.812513/1620.637 
.828153/6421.0347/8-20
.813827/3221.431 
.859455/6421.82815/16-12
.87507/822.22515/16-16
1.0-8
.890657/6422.62215/16-20
.906329/3223.019 
.921959/6423.4161.0-12
.937515/1623.813 
.953161/6424.2091.0-20
.968831/3224.606 
.984463/6425.003 
1.000125.400 

Table F.1: Inch Drill and Tap Sizes


Inch Pipe Thread Taps

Tap Thread Size

Approximate
Inside Diameter

Approximate
Outside Diameter

Tap Drill

1/8-27¼3/811/32
¼-183/817/327/16
3/8-18½11/1637/64
½-145/813/1623/32
¾-1413/16159/64
1-11 ½1 1/161 5/161 - 5/32
1 ¼-11 ½1 3/81 5/81 ½
1 ½-11 ½1 5/81 7/81 - 47/64
2-11 ½2 1/162 3/82 - 7/32
2 ½-82 9/162 7/82 - 5/8

Table F.2: Pipe Thread Taps


Metric Taps

Decimal Equivalent
(inches)

Drill Size
(mm)

Tap Size

.04921.25M1.6 x 0.35
.05711.45M1.8 x 0.35
.06301.6M2 x 0.4
.06891.75M2.2 x 0.45
.07481.9M2.3 x 0.4
.08072.05M2.5 x 0.45
.08462.15M2.6 x 0.45
.09842.5M3 x 0.5
.11422.9M3.5 x 0.6
.12993.3M4 x 0.7
.14763.75M4.5 x 0.75
.16544.2M5 x 0.8
.19695M6 x 1
.20675.25M6 x 0.75
.23626M7 x 1
.26576.75M8 x 1.25
.27567M8 x 1.00
.30517.75M9 x 1.25
.33468.5M10 x 1.5
.34458.75M10 x 1.25
.35439M10 x 1.00
.37409.5M11 x 1.50
.393710M12 x 1.75
.413410.5M12 x 1.25
.472412M14 x 2
.492112.5M14 x 1.5
.511813M14 x 1.25
.551214M16 x 2
.570914.5M16 x 1.5
.610215.5M18 x 2.5
.629916M18 x 2.0
.689017.5M20 x 2.5
.708718M20 x 2.0
.728318.5M20 x 1.5
.767719.5M22 x 2.5
.787420M22 x 2.0
.807120.5M22 x 1.5
.826821M24 x 3
.866122M24 x 2
.885822.5M24 x 1.5
.944924M27 x 3
.984325M27 x 2
1.043326.5M30 x 3.5
1.02428M30 x 2

Table F.3: Metric Taps