TMPG_US-EN

Tap Drill Chart | Unified National - J Series

UNJC

Minor Ø

Recommended Drill Size Drill Size Decimal (in)

Min .0877

Max .0942

Ø Pitch (TPI)

#4 #5 #6 #8

40 40 32 32 24 24 20 18 16 14 13 12 11 10 48 44 40 36 32 28 28 24 24 20 20 18 18 16 14 12 9 8

2.30 mm 2.60 mm 3.50 mm 3.90 mm 4.60 mm 5.30 mm 6.70 mm 8.10 mm 9.50 mm 10.90 mm 31/64" 13.80 mm 16.75 mm 19.60 mm 22.50 mm #33 4.20 mm #13 7/32" 7.00 mm 8.60 mm 10.00 mm 11.60 mm 13.00 mm 14.60 mm 17.60 mm 13/16" 59/64" 2.40 mm 2.70 mm 3.00 mm #28

.0906 .1024 .1130 .1378 .1535 .1811 .2087 .2638 .3189 .3740 .4291 .4844 .5433 .6594 .7717 .8858 .0945 .1063 .1181 .1405 .1654 .1850 .2188 .2756 .3386 .3937 .4567 .5118 .5748 .6929 .8125 .9219

.1007 .1072 .1076 .1157 .1336 .1417

#10 #12 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8

.1494 .1754

.1600 .1852

.2013 .2121

.2584

.2690

.3141 .3250 .3680 .3795 .4814 .4914 .5365 .5474 .6526 .6646 .7668 .7801 .4251 .4368

1

.8783

.8933

UNJF

Minor Ø

Recommended Drill Size Drill Size Decimal (in)

Min

Max

Ø Pitch (TPI)

#4 #5 #6 #8

.0917 .0971 .1029 .1088

.1137 .1370

.1202 .1442

#10 #12 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8

.1596 .1675

.1812

.1896

.2152 .2229 .2719 .2799

.3344 .3888

.3417 .3970

.4513 .4591

.5084

.5166

.5709 .5788 .6892 .6977 .8055 .8152 .9189 .9289

1

THREAD MILLING REFERENCE GUIDE | 27