Emkay Screw Supplies   thread comparison chart

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diameter in mm    diameter in inch  thread threads per inch tapping drill 
1.30 .051 12 BA 90.7 1.05 mm
1.70 .067 10 BA 72.6 1.40 mm
2.00 .079 M2 x .4 63.5 1.60 mm
2.20 .086 2-56 UNC 56 1.80 mm
2.20 .087 8 BA 59.1 1.80 mm
2.50 .098 M2.5 x .45 56.4 2.05 mm
2.50 .098 7 BA 52.9 2.05 mm
2.80 .110 6 BA 47.9 2.30 mm
2.85 .112 4-40 UNC 40 2.30 mm
3.00 .118 M3 x .5 50.8 2.50 mm
3.20 .125 1/8" BSW 40 2.55 mm
3.20 .125 5-40 UNC 40 2.60 mm
3.20 .126 5 BA 43.1 2.65 mm
3.50 .138 M3.5 x .6 42.3 2.90 mm
3.50 .138 6-32 UNC 32 2.80 mm
3.60 .142 4 BA 38.5 3.00 mm
4.00 .157 M4 x .7 36.3 3.30 mm
4.10 .161 3 BA 34.8 3.40 mm
4.20 .164 8-32 UNC 32 3.50 mm
4.70 .185 2 BA 31.4 4.00 mm
4.75 .187 3/16" ME 32 32 4.10 mm
4.75 .187 3/16" ME 40 40 4.20 mm
4.75 .187 3/16" BSF 32 4.00 mm
4.75 .187 3/16" BSW 24 3.70 mm
4.80 .190 10-32 UNF 32 4.10 mm
4.80 .190 10-24 UNC 24 3.90 mm
diameter in mm diameter in inch  thread threads per inch tapping drill
5.00 .196 M5 x .8 31.7 4.20 mm
5.30 .209 1 BA 28.2 4.50 mm
5.50 .216 12-26 UNF 26 4.60 mm
5.50 .216 12-24 UNC 24 4.50 mm
6.00 .236 0 BA 25.4 5.10 mm
6.00 .236 M6 x 1 25.4 5.00 mm
6.35 .250 1/4" ME 32 32 5.60 mm
6.35 .250 1/4" ME 40  40 5.80 mm
6.35 .250 1/4" BSF 26 5.30 mm
6.35 .250 1/4" BSW 20 5.10 mm
6.35 .250 1/4" UNF 28 5.50 mm
6.35 .250 1/4" UNC 20 5.20 mm
7.95 .312 5/16" ME 32 32 7.20 mm
7.95 .312 5/16" ME 40 40 7.40 mm
7.95 .312 5/16" BSF 22 6.80 mm
7.95 .312 5/16" BSW 18 6.50 mm
7.95 .312 5/16" UNF 24 7.00 mm
7.95 .312 5/16" UNC 18 6.60 mm
8.00 .314 M8 x 1.25 20.3 6.80 mm
9.50 .375 3/8" ME 32 32 8.80 mm
9.50 .375 3/8" ME 40 40 9.00 mm
9.50 .375 3/8" BSF 20 8.30 mm
9.50 .375 3/8" BSW 16 7.90 mm
9.50 .375 3/8" UNF 24 8.50 mm
9.50 .375 3/8" UNC 16 8.00 mm

whilst every care has been taken in compiling this chart, no responsibility can be accepted for any inaccuracies.