number drill · nominal diameter

#52
drill bit size.

A #52 bit measures 0.0635 in across (1.613 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#52 · number

0.0635 in

1.613 mm

Designation#52number

Inch decimal0.0635nominal

Metric conversion1.613millimetres

Where this size sits from 0 to 1 inch

#52 · 1.613 mm on a zero to 25.4 millimetre scale. Neighbor marks: 1.6 mm, 1/16.

0 25.4 mm

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Measured neighbors

What sits beside #52.

“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

1.6 mmmetric 0.0630 inΔ -0.013 mm 1/16fractional 0.0625 inΔ -0.025 mm 1.7 mmmetric 0.0669 inΔ +0.087 mm 1.5 mmmetric 0.0591 inΔ -0.113 mm 1.8 mmmetric 0.0709 inΔ +0.187 mm

Same seriesNEAREST NOMINAL ROWS

#51number 1.702 mmΔ +0.089 mm #53number 1.511 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

#52drill bit size.

What sits beside #52.

ASME.

#52
drill bit size.