{
  "id": "k21-105",
  "name": "K21-105",
  "aliases": [],
  "domain": "land",
  "country": "KOR",
  "category": "Amphibious light tank",
  "status": null,
  "fielded": 2014,
  "operators": [
    "KOR"
  ],
  "prolif_count": 1,
  "summary": "The K21-105 is a new light tank. It was jointly developed by CMI Defense of Belgium and Doosan DST of South Korea.",
  "specs": [
    {
      "k": "",
      "label": "Manufacturer",
      "section": "system",
      "v": "Hanwha Defense (originally Daewoo Heavy Industries, later renamed as Doosan DST, follow by Hanwha Defense Systems)",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Configuration",
      "section": "system",
      "v": "Track",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "crew",
      "v": 3,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "width_m",
      "v": 3.4,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "height_m",
      "v": 2.6,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "combat_weight_t",
      "v": 25,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "engine_hp",
      "v": 750,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "road_range_km",
      "v": 450,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "speed_road_kmh",
      "v": 70,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "speed_swim_kmh",
      "v": 6,
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Fording depth",
      "section": "mobility",
      "v": "Amphibious",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Computerized FCS",
      "section": "firecontrol",
      "v": "Yes",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Thermal Sight Vehicle Commander",
      "section": "firecontrol",
      "v": "Yes, The commander's sight is equipped with the same system as the gunner's. This allows the gunner to use the commander's sight to engage targets if his own sight is disabled or destroyed. The commander of the vehicle also has the ability ",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Thermal Sight Gunner",
      "section": "firecontrol",
      "v": "Yes, The gunner's sight is equipped with a third generation thermal viewer and a 1.54 μm laser rangefinder. It can detect targets from 6,000 meters away and identify them from 3,000 meters away.",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Main Gun Stabilization",
      "section": "firecontrol",
      "v": "Yes",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Hull Armor",
      "section": "protection",
      "v": "2519 aluminium alloy chassis. Layers consisting of S2 glass fiber reinforced Al2O3 ceramic armor. All round protection against 14.5×114mm API projectiles as well as 20 mm FSP. Frontal armour is resistant to 30 mm APDS rounds fired from a 2A",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Turret Armor",
      "section": "protection",
      "v": "All round protection against 14.5×114mm API projectiles as well as 20 mm FSP",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Applique Armor",
      "section": "protection",
      "v": "Available",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Explosive reactive armor",
      "section": "protection",
      "v": "Soft- and hard-kill anti-missile defense systems, ERA, NERA (only for the K21 PIP)",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "NBC Protection",
      "section": "protection",
      "v": "Yes",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Smoke Equipment",
      "section": "protection",
      "v": "Yes",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    },
    {
      "k": "armament",
      "label": "Secondary armament",
      "v": "2 x K12 7.62mm General-Purpose Machine Gun",
      "src": [
        "weg-k21-105"
      ],
      "conf": "medium"
    }
  ],
  "payloads": [],
  "variants": [
    {
      "name": "Ammunition note",
      "text": "It fires all standard NATO 105 mm ammunition. It can fire newly-developed smart ammunition.",
      "src": [
        "weg-k21-105"
      ]
    },
    {
      "name": "K21",
      "text": "The K-21 is lighter comparing with most modern IFVs, as it was designed using composite materials to save weight wherever possible.",
      "src": [
        "weg-k21-105"
      ]
    }
  ],
  "art": "tank",
  "image": null,
  "verified": null,
  "changelog": [
    {
      "date": "2026-10-10",
      "change": "Entry created from the Worldwide Equipment Guide (ODIN), bulk import"
    }
  ],
  "url": "https://www.defensepedia.com/systems/k21-105.html",
  "sources": {
    "weg-k21-105": {
      "title": "K21-105 South Korean Amphibious Light Tank",
      "publisher": "U.S. Army TRADOC G-2 Worldwide Equipment Guide (ODIN)",
      "url": "https://odin.t2com.army.mil/WEG/Asset/K21-105_South_Korean_Amphibious_Light_Tank",
      "published": "2026-03-20",
      "tier": 1,
      "checked": "2026-10-10"
    }
  }
}