number drill · nominal diameter

#59
drill bit size.

A #59 bit measures 0.0410 in across (1.041 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#59 · number

0.0410 in

1.041 mm

Designation#59number

Inch decimal0.0410nominal

Metric conversion1.041millimetres

Where this size sits from 0 to 1 inch

#59 · 1.041 mm on a zero to 25.4 millimetre scale. Neighbor marks: #60, #58.

0 25.4 mm

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Measured neighbors

What sits beside #59.

“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

1 mmmetric 0.0394 inΔ -0.041 mm 1.1 mmmetric 0.0433 inΔ +0.059 mm

Same seriesNEAREST NOMINAL ROWS

#60number 1.016 mmΔ -0.025 mm #58number 1.067 mmΔ +0.025 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

#59drill bit size.

What sits beside #59.

ASME.

#59
drill bit size.