Najin-class frigate

The North Korean Najin-class frigates are some of the largest vessels in the Korean People's Navy. Although they bear a striking resemblance to ex-Soviet Kola class frigates, they are unrelated to any Russian or Chinese design.[4] The class was originally fitted with a trainable triple 21 inch torpedo launcher, which was replaced in the mid-1980s with fixed Styx missile launchers taken from Osa class missile boats. The design is inherently dangerous, and even a minor missile failure would result in significant damage to the ship.

At least one Najin-class ship appears to upgraded with much more modern weaponry in 2014. At Nampho the outdated anti-ship missiles, aft 57mm dual cannon, Drum Tilt fire-control radar and surface search radar were removed, and several new systems were installed. Most clearly identifiable are two 30mm automated turrets at the aft, likely based on the Soviet AK-630 CIWS, and two Kh-35 missile racks with the capacity for some 8 missiles in place of the older Styx/HY-2 launchers. The modernization program appears to be continuing as of December 2014.

Country Name Origin Year
Korea 1973
Country Name Operational Year Retirement Year
Korea 1973 View

Class overview
Builders: Unknown, but built in North Korea (Najin Shipyards)
Operators:  Korean People's Navy
Built: 1971-1979
In commission: 1973-present
Completed: 4+
Active: 2+
Retired: 2+
General characteristics
Type: Frigate
Displacement: 1,600 long tons (1,600 t)
Length: 328 ft (100 m)
Beam: 32.8 ft (10.0 m)
Draught: 8.9 ft (2.7 m)
Propulsion: 2x diesels; 15,000 bhp; 2 shafts
Speed: 26 knots (30 mph; 48 km/h)
Range: 4,000 nmi (4,600 mi; 7,400 km) at 14 knots (16 mph; 26 km/h)
Complement: 180
Sensors and
processing systems:
Radar
Air search: Square Tie
Surface search: Pot Head
Navigation: Pot Drum
Fire control: Drum Tilt
Sonar
Stag horn; hull-mounted active search/attack sonar
Armament: Missiles:
SSM - two SS-N-2 Styx or SS-N-25 Switchblade 
Guns
2x 100 mm (4 in)/56 (single); 4x 57 mm (2 in) (twin); twelve or four 30 mm (1 in)/66 (6 or 2 twin);
12x 25 mm (1 in) machine guns (6 twin)
Other:
Two RBU 1200 five-tube fixed launchers
Depth charges (two projectors, two racks)
30 mines

End notes