number drill · nominal diameter

#11
drill bit size.

A #11 bit measures 0.1910 in across (4.851 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#11 · number

0.1910 in

4.851 mm

Designation#11number

Inch decimal0.1910nominal

Metric conversion4.851millimetres

Where this size sits from 0 to 1 inch

#11 · 4.851 mm on a zero to 25.4 millimetre scale. Neighbor marks: 4.9 mm, #12.

0 25.4 mm

Show calibrated outline Open in Finder

Measured neighbors

What sits beside #11.

“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

4.9 mmmetric 0.1929 inΔ +0.049 mm 4.8 mmmetric 0.1890 inΔ -0.051 mm 3/16fractional 0.1875 inΔ -0.089 mm 5 mmmetric 0.1969 inΔ +0.149 mm 4.7 mmmetric 0.1850 inΔ -0.151 mm

Same seriesNEAREST NOMINAL ROWS

#12number 4.801 mmΔ -0.051 mm #10number 4.915 mmΔ +0.064 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

#11drill bit size.

What sits beside #11.

ASME.

#11
drill bit size.