| Bollard pull | 185 tonnes |
| Bunker capacity: | 2,259 m³ |
| Endurance: | 6–8 weeks |
| Ice breaking capacity: | 1.2 m level ice at 3 knots |
Ymer is the fifth and last icebreaker in the . She was launched in late 1976, and on 25 October 1977 she was delivered to the Swedish Navy and departed the Wärtsilä Helsinki Shipyard bound for Stockholm, where she arrived on 3 November.