number drill · nominal diameter

#6
drill bit size.

A #6 bit measures 0.2040 in across (5.182 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#6 · number

0.2040 in

5.182 mm

Designation#6number

Inch decimal0.2040nominal

Metric conversion5.182millimetres

Where this size sits from 0 to 1 inch

#6 · 5.182 mm on a zero to 25.4 millimetre scale. Neighbor marks: 5.2 mm, 13/64.

0 25.4 mm

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Measured neighbors

What sits beside #6.

“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

5.2 mmmetric 0.2047 inΔ +0.018 mm 13/64fractional 0.2031 inΔ -0.022 mm 5.1 mmmetric 0.2008 inΔ -0.082 mm 5.3 mmmetric 0.2087 inΔ +0.118 mm

Same seriesNEAREST NOMINAL ROWS

#5number 5.220 mmΔ +0.038 mm #7number 5.105 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

#6drill bit size.

What sits beside #6.

ASME.

#6
drill bit size.