3 Tap Drilling Sizes

Drilled Hole Size

 

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Metric Wire Insert
Screw Threads
UNC Wire Insert
Screw Threads
UNF Wire Insert
Screw Threads
BSW Wire Insert
Screw Threads
Thread Size Drill Dia. MM Thread Size Drill Dia. MM Thread Size Drill Dia. MM Thread Size Drill Dia. MM
M2X0.4 2.12 No2X56 2.3 No2X64 2.29 1/8X40 3.34
M2.5X0.45 2.63 3X48 2.65 3X56 2.63 3/16X24 5.03
M3X0.5 3.15 4X40 3.01 4X48 2.98 1/4X20 6.6
M3.5X0.6 3.68 5X40 3.34 5X44 3.32 5/16X18 8.3
M4X0.7 4.21 6X32 3.71 6X40 3.67 3/8X16 9.3
M4.5X0.75 4.72 8X32 4.37 8X36 4.35 7/16X14 11.5
M5X0.8 5.24 10X24 5.1 10X32 5.03 1/2X12 13.2
M6X1.0 6.3 12X24 5.76 1/4X28 6.5 9/16X12 14.8
M7X1.0 7.3 1/4X20 6.6 5/16X18 8.2 5/8X11 17.1
M8X1.25 8.4 5/16X18 8.3 3/8X24 9.8 11/16X11 18
M9X1.25 9.4 3/8X16 9.9 7/16X20 11.4 3/4X10 19.7
M10X1.5 10.4 7/16X14 11.5 1/2X20 13 7/8X9 22.9
M11X1.5 11.4 1/2X13 13.2 9/16X18 14.65 1”X8 26.2
M12X1.75 12.5 9/16X12 14.4 5/8X18 16.2 1.1/8X7 29.5
M14X2.0 14.6 5/8X11 16.4 3/4X16 19.4 1.1/4X7 32.6
M16X2.0 16.6 3/4X10 19.7 7/8X14 22.7 1.1/2X6 39.1
M18X2.5 18.7 7/8X9 22.9 1”X12 25.9
M20X2.5 20.7 1”X8 26.2 1.1/8X12 29.1
M22X2.5 22.7 1.1/8X7 29.5 1.1/4X12 32.3
M24X3.0 24.9 1.1/4X7 32.6 1.3/8X12 35.4
M27X3.0 27.9 1.3/8X6 36 1.1/2X12 38.65
M30X3.5 31 1.1/2X6 39.2
M33X3.5 34
M36X4.0 37.2
M39X4.0 40.2

BSF Wire Insert 
Screw Threads
G(BSP) Wire Insert
Screw Threads
BA Wire Insert
Screw Threads
Thread Size Drill Dia. MM Thread Size Drill Dia. MM Thread Size Drill Dia. MM
3/16X32 4.97 G1/8X28 9.9 0 6.4
7/32X28 5.97 1/4X19 13.5 1 5.6
1/4X26 6.6 3/8X19 17 2 5
9/32X26 7.3 1/2X14 21.4 3 4.4
5/16X22 8.2 5/8X14 23.3 4 3.8
3/8X20 9.8 3/4X14 26.9 5 3.4
7/16X18 11.4 7/8X14 30.6 6 3
1/2X16 13.1 1”X11 33.8
9/16X16 14.6 1.1/8X11 38.4
5/8X14 16.3 1.1/4X11 42.5
11/16X14 17.9 1.1/2X11 48.3
3/4X12 19.5 2”X11 60.2
13/16X12 21.1
7/8X11 22.8
1”X10 26
1.1/8X9 29.3
1.1/4X9 32.4
1.3/8X8 35.7
1.1/2X8 38.9

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