Näcken-class submarine

{{Infobox ship image

|Ship image=File:HMS Neptun under bogsering till Kockums Karlskrona för översyn..jpg

|Ship caption=HSwMS Neptun

}}

{{Infobox ship class overview

|Name=Näcken-class

|Builders=Kockums

|Operators=*{{Navy|SWE}}

• {{Navy|DEN}}

|Class before={{sclass|Sjöormen|submarine|0}}

|Class after={{sclass|Västergötland|submarine|0}}

|Subclasses=

|Built range=

|In commission range=

|Total ships building=

|Total ships planned=3

|Total ships completed=3

|Total ships cancelled=

|Total ships active=

|Total ships laid up=

|Total ships scrapped=2

|Total ships retired=

|Total ships preserved=1

}}

{{Infobox ship characteristics

|Hide header=

|Header caption=

|Ship type=Submarine

|Ship displacement=*{{convert|1030|t|LT|lk=out}} submerged

|Ship length={{convert|49.5|m|ftin|abbr=on}}

|Ship beam={{convert|5.7|m|ftin|abbr=on}}

|Ship draught={{convert|5.5|m|ftin|abbr=on}}

|Ship draft=

|Ship propulsion=*2 × MTU diesel engines

• 1 × Jeumont-Schneider electric motor
• 1 shaft

|Ship speed=*{{convert|20|kn|lk=in}} surfaced

• {{convert|25|kn}} submerged

|Ship range=

|Ship endurance=

|Ship test depth={{convert|150|m|ft|abbr=on}}

|Ship complement= 19 (5 officers)

|Ship sensors=FAS

|Ship EW=

|Ship armament=*6 × {{convert|533|mm|in|0|abbr=on}} torpedo tubes

• 2 × {{convert|400|mm|in|0|abbr=on}} torpedo tubes
• Mines

|Ship notes=

}}