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MECA Electronics

Drill Sizes - Numbered

Drill bits are available in hundreds of sizes, and the size designations include letters, numbers, decimals, and fractions. Decimal drill sizes further include both SAE units and metric units. This particular page presents the numbered drill size series. RF Cafe also has drill size tables for lettered drill size varieties.

These drill bits are almost always of the twist type that advance through the material being bored by turning in a clockwise direction as viewed from the top. They are said to be right-hand drill bits.








#Diameter
(in)
 #Diameter
(in)
 #Diameter
(in)
 #Diameter
(in)
 #Diameter
(in)
10.2280210.1590410.0960610.039081.0130
20.2210220.1570420.0935620.038082.0125
30.2130230.1540430.0890630.037083.0120
40.2090240.1520440.0860640.036084.0115
50.2055250.1495450.0820650.035085.0110
60.2040260.1470460.0810660.033086.0105
70.2010270.1440470.0785670.032087.0100
80.1990280.1405480.0760680.031088.0095
90.1960290.1360490.0730690.029289.0091
100.1935300.1285500.0700700.028090.0087
110.1910310.1200510.0670710.026091.0083
120.1890320.1160520.0635720.025092.0079
130.1850330.1130530.0595730.024093.0075
140.1820340.1110540.0550740.022594.0071
150.1800350.1100550.0520750.021095.0067
160.1770360.1065560.0465760.020096.0063
170.1730370.1040570.0430770.018097.0059
180.1695380.1015580.0420780.0160  
190.1660390.0995590.0410790.0145  
200.1610400.0980600.0400800.0135  


  Thanks to Jeff M. for pointing out the previous error in the #61 - #80 values (they were shifted by one row).


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