number drill · nominal diameter

#46
drill bit size.

A #46 bit measures 0.0810 in across (2.057 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#46 · number

0.0810 in

2.057 mm

Designation#46number

Inch decimal0.0810nominal

Metric conversion2.057millimetres

Where this size sits from 0 to 1 inch

#46 · 2.057 mm on a zero to 25.4 millimetre scale. Neighbor marks: #45, 2.1 mm.

0 25.4 mm

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Measured neighbors

What sits beside #46.

“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

2.1 mmmetric 0.0827 inΔ +0.043 mm 2 mmmetric 0.0787 inΔ -0.057 mm 5/64fractional 0.0781 inΔ -0.073 mm 2.2 mmmetric 0.0866 inΔ +0.143 mm

Same seriesNEAREST NOMINAL ROWS

#45number 2.083 mmΔ +0.025 mm #47number 1.994 mmΔ -0.063 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

#46drill bit size.

What sits beside #46.

ASME.

#46
drill bit size.