15/16″ spanner
23.81 mm · 0.94 in
15/16″ across the flats
The nearest metric size
24 mm is 24.00 mm — 0.19 mm larger than 15/16″.
0.19 mm is a marginal fit: usable on a fastener that turns freely, and a poor idea on one that is seized or soft.
The numbers
| Across flats | 23.81 mm · 0.94 in |
| Nearest metric | 24 mm — 24.00 mm |
| Difference | 0.19 mm — marginal |
Nearby imperial sizes
| Size | mm | Nearest metric | Gap |
|---|---|---|---|
| 13/16″ | 20.64 | 21 mm | 0.36 mm — do not |
| 7/8″ | 22.22 | 22 mm | 0.22 mm |
| 15/16″ | 23.81 | 24 mm | 0.19 mm |
| 1″ | 25.40 | 24 mm | 1.40 mm — do not |
| 1-1/16″ | 26.99 | 27 mm | 0.01 mm — swap |
Frequently asked questions
What is 15/16″ in millimetres?
23.81 mm. The nearest metric spanner is 24 mm — 0.19 mm larger.
Can I use 24 mm instead of 15/16″?
Marginally. 0.19 mm is enough to feel loose on a tight fastener and enough to round a soft one. It will work on something that is not seized; it is not what you want on something that is.
Where is 15/16″ used?
Imperial spanner sizes are "across flats" measurements and are still standard on American vehicles, plumbing and older machinery everywhere.