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TAP DRILLS
& CHART
thread in → tap drill out · UN · metric · NPT
TAP DRILL
DRILL CHART
THREAD TYPE
UN
Metric
NPT
SIZE
#0 (0.060")
#1 (0.073")
#2 (0.086")
#3 (0.099")
#4 (0.112")
#5 (0.125")
#6 (0.138")
#8 (0.164")
#10 (0.190")
#12 (0.216")
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
1-1/8"
1-1/4"
1-3/8"
1-1/2"
PITCH
13 TPI · UNC
20 TPI · UNF
1/2-13 UNC
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TAP DRILL
tap to copy
27/64"
0.4219
10.72 mm
% thread 78%
OTHER DRILLS · tap to copy
7/16"
0.4375
11.11 mm
63%
UN tap drills for ~75% thread; metric per ISO; NPT drill without reamer.