number drill · nominal diameter

#26
drill bit size.

A #26 bit measures 0.1470 in across (3.734 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#26 · number

0.1470 in

3.734 mm

Designation#26number

Inch decimal0.1470nominal

Metric conversion3.734millimetres

Where this size sits from 0 to 1 inch

#26 · 3.734 mm on a zero to 25.4 millimetre scale. Neighbor marks: 3.7 mm, #25.

0 25.4 mm

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Measured neighbors

What sits beside #26.

“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

3.7 mmmetric 0.1457 inΔ -0.034 mm 3.8 mmmetric 0.1496 inΔ +0.066 mm 3.6 mmmetric 0.1417 inΔ -0.134 mm 9/64fractional 0.1406 inΔ -0.162 mm

Same seriesNEAREST NOMINAL ROWS

#25number 3.797 mmΔ +0.063 mm #27number 3.658 mmΔ -0.076 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

#26drill bit size.

What sits beside #26.

ASME.

#26
drill bit size.