Make your own free website on Tripod.com


MACHINISTS GUIDES

HOME MACHINISTS GUIDES  
LINKS METALWORKING BOOKS  

 

 

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


BACK TO HELPFUL HINTS

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


CLICK HERE FOR MORE INFORMATION SEE METALWORKING GUIDES

BACK TO HELPFUL HINTS

 

Send mail to THZABEL@HOTMAIL.COM with questions or comments about this web site.
Copyright 2001 METALWORKING BOOKS
Last modified: November 29, 2001