number drill · nominal diameter

#14
drill bit size.

A #14 bit measures 0.1820 in across (4.623 mm).

The inch decimal is the published nominal designation; millimetres are a conversion.

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#14 · number

0.1820 in

4.623 mm

Designation#14number

Inch decimal0.1820nominal

Metric conversion4.623millimetres

Where this size sits from 0 to 1 inch

#14 · 4.623 mm on a zero to 25.4 millimetre scale. Neighbor marks: 4.6 mm, #15.

0 25.4 mm

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Measured neighbors

What sits beside #14.

“Nearest” means nominal diameter only. It does not make a neighboring size acceptable for a tolerance, tapping, reaming, or fastener application.

Other naming systemsABSOLUTE DIAMETER DELTA

4.6 mmmetric 0.1811 inΔ -0.023 mm 4.7 mmmetric 0.1850 inΔ +0.077 mm 4.5 mmmetric 0.1772 inΔ -0.123 mm 3/16fractional 0.1875 inΔ +0.140 mm 4.8 mmmetric 0.1890 inΔ +0.177 mm

Same seriesNEAREST NOMINAL ROWS

#15number 4.572 mmΔ -0.051 mm #13number 4.699 mmΔ +0.076 mm

Source record

ASME.

The standard text is paywalled. Number and letter series are cross-checked against public manufacturer charts; exact standard edition/page verification remains a release gate.

Open source record

#14drill bit size.

What sits beside #14.

ASME.

#14
drill bit size.