number drill · nominal diameter

#60
drill bit size.

A #60 bit measures 0.0400 in across (1.016 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#60 · number

0.0400 in

1.016 mm

Designation#60number

Inch decimal0.0400nominal

Metric conversion1.016millimetres

Where this size sits from 0 to 1 inch

#60 · 1.016 mm on a zero to 25.4 millimetre scale. Neighbor marks: 1 mm, #59.

0 25.4 mm

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Measured neighbors

What sits beside #60.

“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 -0.016 mm 1.1 mmmetric 0.0433 inΔ +0.084 mm

Same seriesNEAREST NOMINAL ROWS

#59number 1.041 mmΔ +0.025 mm #61number 0.991 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

#60drill bit size.

What sits beside #60.

ASME.

#60
drill bit size.