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Drill Sizes for close and free fit

Size

 Threads Tap Drills

Clearance hole drills
No or Dia. Decimal (inches) Per inch
[per mm]		 Drill size
[metric]		 Decimal
equiv.		 Close fit Free Fit
Drill size Decimal Drill Size Decimal
#2 0.086 56 50 0.0700 48 0.0760 46 0.0810
#4 0.112 40 43 0.0890 32 0.1160 30 0.1285
#6 0.138 32 36 0.1065 27 0.1440 25 0.1495
#8 0.164 32 29 0.1360 18 0.1695 16 0.1770
#10 0.190 32 21 0.1590 9 0.1960 7 0.2010
1/4 0.250 20 7 0.2010 F 0.2570 H 0.2660
3/8 0.375 16 5/16 0.3125 W 0.3860 25/64 0.3906
3/4 0.750 16 21/32 0.6562 49/64 0.7656 25/32 0.7812
M2 0.079 [0.4] [1.60] 0.0630 45 0.0820 43 0.0890
M2.5 0.098 [0.45] [2.05] 0.0807 39 0.0995 37 0.1040
M3 0.118 [0.5] [2.50] 0.0984 1/8 0.1250 29 0.1360
M4 0.157 [0.7] [3.30] 0.1299 20 0.1610 18 0.1695
M6 0.236 [1] [5.00] 0.1968 C 0.2420 1/4 0.2500
M6 0.314 [1] [6.00] 0.2756 P 0.3230 21/64 0.3281
 

 

 

 

 

 

 

 

LAST UPDATED 04/09/2005

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