metric comparison size · nominal diameter
13 mm
drill bit size.
A 13 mm bit measures 0.5118 in across (13.000 mm).
The metric diameter is the generated reference value; inches are a conversion. Commercial set contents vary.
Calibrated relative diameter · 1 in reference
13 mm · metric
0.5118 in
13.000 mm Designation13 mmmetric
Inch decimal0.5118nominal
Metric conversion13.000millimetres
Where this size sits from 0 to 1 inch 13 mm · 13.000 mm on a zero to 25.4 millimetre scale. Neighbor marks: 33/64, 12.9 mm.
Measured neighbors
What sits beside 13 mm.
“Nearest” means nominal diameter only. It does not make a neighboring size acceptable for a tolerance, tapping, reaming, or fastener application.
Source record
Drill Bit Size Chart.
A generated comparison series from 0.5 to 13.0 mm in 0.1 mm steps. It is not a claim that every size is included in every commercial set.
Open source record