number drill · nominal diameter

#45
drill bit size.

A #45 bit measures 0.0820 in across (2.083 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#45 · number

0.0820 in

2.083 mm

Designation#45number

Inch decimal0.0820nominal

Metric conversion2.083millimetres

Where this size sits from 0 to 1 inch

#45 · 2.083 mm on a zero to 25.4 millimetre scale. Neighbor marks: 2.1 mm, #46.

0 25.4 mm

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Measured neighbors

What sits beside #45.

“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 +0.017 mm 2 mmmetric 0.0787 inΔ -0.083 mm 5/64fractional 0.0781 inΔ -0.098 mm 2.2 mmmetric 0.0866 inΔ +0.117 mm

Same seriesNEAREST NOMINAL ROWS

#46number 2.057 mmΔ -0.025 mm #47number 1.994 mmΔ -0.089 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

#45drill bit size.

What sits beside #45.

ASME.

#45
drill bit size.