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Tap and Drill Bit Size Chart

The charts below show you what size drill bit to use with a tap. 
Tap sizes are shown as hole size - threads per inch.  Example 1/4-20 = 1/4" hole, 20 threads per inch.

Imperial / SAE tap and drill bit size table

Tap Fractional Drill Bit Number Drill Bit Letter Drill Bit
0-80 3/64 - -
1-64 - 53 -
2-56 - 50 -
3-48 - 47 -
4-40 3/32 43 -
5-40 - 38 -
6-32 7/64 35 -
8-32 - 29 -
10-24 5/32 25 -
10-32 5/32 21 -
12-24 11/64 16 -
1/4-20 13/64 7 -
1/4-28 7/32 3 -
5/16-18 17/64 - F
5/16-24 - - I
3/8-16 5/16 - -
3/8-24 21/64 - Q
7/16-14 23/64 - U
7/16-20 25/64 - -
1/2-13 27/64 - -
1/2-20 29/64 - -
9/16-12 31/64 - -
9/16-18 33/64 - -
5/8-11 17/32 - -
5/8-18 37/64 - -
3/4-10 21/32 - -
3/4-16 11/16 - -
Drill sizes are for 75% depth of thread.

Metric tap and drill bit size table
Tap sizes are shown as hole size - threads per mm (millimeter).  Example 6mm-1.0 = 6mm hole, 1 threads per mm.

Tap Metric Drill Imperial Drill
3 mm x 0.6 2.5 mm -
4 mm x 0.7 3.4 mm -
5 mm x 0.8 4.3 mm -
6 mm x 1.0 5.2 mm -
7 mm x 1.0 6.1 mm 15/64
8 mm x 1.25 6.9 mm 17/64
8 mm x 1.0 7.1 mm -
10 mm x 1.5 8.7 mm -
10 mm x 1.25 8.9 mm 11/32
10 mm x 1.0 9.1 mm -
12 mm x 1.75 10.5 mm -
12 mm x 1.5 10.7 mm 27/64
14 mm x 2.0 12.2 mm -
14 mm x 1.5 12.7 mm -
16 mm x 2.0 14.2 mm 35/64
16 mm x 1.5 14.7 mm -
Drill sizes are for 75% depth of thread.

 
Guide to a Jeeper's Garage
A guide or those of us with a "real world" income.  What tools to have and what stuff to have.

Removing Seized Nuts and Bolts
Without all the cussing.

Tap and Die
Guide to Threading Tools

Jeep Parts and Accessories
OK Auto 4WD & Tire - Jeep Parts and Accessories
 

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