22 mm spanner
22.00 mm · 0.87 in
22 mm across the flats · fits a M14 (DIN) hex head
The nearest imperial size
7/8″ is 22.22 mm — 0.22 mm larger than 22 mm.
0.22 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 | 22.00 mm · 0.87 in |
| Nearest imperial | 7/8″ — 22.22 mm |
| Difference | 0.22 mm — marginal |
| Fits | M14 (DIN) hex head |
Nearby metric sizes
| Size | mm | Nearest imperial | Gap |
|---|---|---|---|
| 19 mm | 19.00 | 3/4″ | 0.05 mm — swap |
| 21 mm | 21.00 | 13/16″ | 0.36 mm — do not |
| 22 mm | 22.00 | 7/8″ | 0.22 mm |
| 24 mm | 24.00 | 15/16″ | 0.19 mm |
Frequently asked questions
What is 22 mm in inches?
0.87 inches. The nearest imperial spanner is 7/8″ at 22.22 mm, 0.22 mm larger.
Can I use 7/8″ instead of 22 mm?
Marginally. 0.22 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.
What bolt does a 22 mm spanner fit?
A M14 (DIN) hex head. The full metric thread chart gives the tapping drill and clearance hole for it too.