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Drill Sizes - Lettered

 

Drill bits are available in a number 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 lettered drill size series. RF Cafe also has drill size tables for numbered 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.

LetterDiameter
(in)
 LetterDiameter
(in)
A0.234N0.302
B0.238O0.316
C0.242P0.323
D0.246Q0.332
E0.250R0.339
F0.257S0.348
G0.261T0.358
H0.266U0.368
I0.272V0.377
J0.277W0.386
K0.281X0.397
L0.290Y0.404
M0.295Z0.413
 
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RF Cafe
Erie, PA
(814) 833-1967

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GPS Coordinates:
N 42°04.577', W 080°11.757'

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