letter drill · nominal diameter

P
drill bit size.

A P bit measures 0.3230 in across (8.204 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

P · letter

0.3230 in

8.204 mm

DesignationPletter

Inch decimal0.3230nominal

Metric conversion8.204millimetres

Where this size sits from 0 to 1 inch

P · 8.204 mm on a zero to 25.4 millimetre scale. Neighbor marks: 8.2 mm, 8.3 mm.

0 25.4 mm

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Measured neighbors

What sits beside P.

“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

8.2 mmmetric 0.3228 inΔ -0.004 mm 8.3 mmmetric 0.3268 inΔ +0.096 mm 8.1 mmmetric 0.3189 inΔ -0.104 mm 21/64fractional 0.3281 inΔ +0.130 mm 8.4 mmmetric 0.3307 inΔ +0.196 mm

Same seriesNEAREST NOMINAL ROWS

Oletter 8.026 mmΔ -0.178 mm Qletter 8.433 mmΔ +0.229 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

Pdrill bit size.

What sits beside P.

ASME.

P
drill bit size.