number drill · nominal diameter

#44
drill bit size.

A #44 bit measures 0.0860 in across (2.184 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#44 · number

0.0860 in

2.184 mm

Designation#44number

Inch decimal0.0860nominal

Metric conversion2.184millimetres

Where this size sits from 0 to 1 inch

#44 · 2.184 mm on a zero to 25.4 millimetre scale. Neighbor marks: 2.2 mm, #43.

0 25.4 mm

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Measured neighbors

What sits beside #44.

“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

2.2 mmmetric 0.0866 inΔ +0.016 mm 2.1 mmmetric 0.0827 inΔ -0.084 mm 2.3 mmmetric 0.0906 inΔ +0.116 mm 2 mmmetric 0.0787 inΔ -0.184 mm

Same seriesNEAREST NOMINAL ROWS

#43number 2.261 mmΔ +0.076 mm #45number 2.083 mmΔ -0.102 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

#44drill bit size.

What sits beside #44.

ASME.

#44
drill bit size.