metric comparison size · nominal diameter
7.9 mm
drill bit size.
A 7.9 mm bit measures 0.3110 in across (7.900 mm).
The metric diameter is the generated reference value; inches are a conversion. Commercial set contents vary.
Calibrated relative diameter · 1 in reference
7.9 mm · metric
0.3110 in
7.900 mm Designation7.9 mmmetric
Inch decimal0.3110nominal
Metric conversion7.900millimetres
Where this size sits from 0 to 1 inch 7.9 mm · 7.900 mm on a zero to 25.4 millimetre scale. Neighbor marks: 5/16, 8 mm.
Measured neighbors
What sits beside 7.9 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