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MACHINISTS GUIDES

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TAP DRILL SIZES FOR THREADED INSERTS (HELICOIL)

STEEL, PLASTIC, MAGNESIUM

TAP
SIZE
TAP
DRILL
SIZE
DECIMAL
EQUIV. OF 
TAP DRILL
(INCHES)
4-40 # 31 .1200
5-40 # 29 .13600
6-32 # 25 .1495
6-40 # 25 .1495
8-32 # 16 .1770
10-24 #5 .2055
10-32 13/64 .2031
12-24 # 1 .2280
1/4-20 17/64 .2656
1/4-28 17/64 .2656
5/16-18 Q .3320
5/16-24 Q .3320
3/8-16 X .3970
3/8-24 25/64 .3906
7/16-14 15/32 .4687
7/16-20 29/64 .4531
1/2-13 17/32 .5312
1/2-20 33/64 .5156

ALUMINUM

TAP
SIZE
TAP
DRILL
SIZE
DECIMAL
EQUIV. OF 
TAP DRILL
(INCHES)
4-40 # 31 .1200
5-40 # 30 .1285
6-32 # 25 .1495
6-40 # 26 .1470
8-32 # 17 .1730
10-24 13/64 .2031
10-32 #7 .2010
12-24 # 2 .2210
1/4-20 17/64 .2656
1/4-28 G .2610
5/16-18 Q .3320
5/16-24 21/64 .3281
3/8-16 X .3970
3/8-24 25/64 .3906
7/16-14 29/64 .4531
7/16-20 29/64 .4531
1/2-13 33/64 .5156
1/2-20 33/64 .5156

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Copyright 2001 METALWORKING BOOKS
Last modified: November 29, 2001