Design

• The Hastutaka class minelayer was reinforced model of the Shirataka
  Japanese minelayer Shirataka
  was a medium-sized minelayer of the Imperial Japanese Navy, which was in service during the Second Sino-Japanese War and World War II. She was the world's first purpose-built anti-submarine netlayer...
  
  . The Harima Zōsen Corporation dealt with all of the Hatsutaka class.

Hatsutaka class

• Project number was H12. First production model of the Hatsutaka class. 2 vessels were built in 1938-40 under the Maru 3 Programme
  3rd Naval Armaments Supplement Programme (Japan, 1937)
  The otherwise known as the "Circle Three" Plan was the third of four expansion plans of the Imperial Japanese Navy between 1930 and the start of World War II.-Background:...
  
   (Ship # 7 - 8). They were equipped with 4 × 40 mm quick-firing guns for anti-submarine warfare.

  Ship #	Ship	Laid down	Launched	Completed	Fate
  7		29 March 1938	28 April 1939	31 October 1939	Sunk by USS Hawkbill USS Hawkbill (SS-366) USS Hawkbill , a Balao-class submarine, was the first ship of the United States Navy to be named for the hawksbill, a large sea turtle ....  at South China Sea South China Sea The South China Sea is a marginal sea that is part of the Pacific Ocean, encompassing an area from the Singapore and Malacca Straits to the Strait of Taiwan of around...  04°54′N 103°28′E on 16 May 1945.
  8		10 May 1939	3 February 1940	30 June 1940	Sunk by USS Pargo USS Pargo (SS-264) USS Pargo , a Gato-class submarine, was the first ship of the United States Navy to be named for the pargo, a fish of the genus Lutjanus found in the West Indies....  at north of Jesselton Kota Kinabalu Kota Kinabalu , formerly known as Jesselton, is the capital of Sabah state in East Malaysia. It is also the capital of the West Coast Division of Sabah. The city is located on the northwest coast of Borneo facing the South China Sea. The Tunku Abdul Rahman National Park lies on one side and Mount...  07°00′N 116°00′E on 26 September 1944.

Wakataka class

• Project number was H12B. Second production model of the Hatsutaka class. Only 1 vessel was built under the Maru 4 Programme
  4th Naval Armaments Supplement Programme (Japan, 1939)
  The was one of the armaments expansion plan of the Imperial Japanese Navy .-Background:In 1939, the IJN started new naval armaments expansion plan...
  
   (Ship # 102). She was equipped with 2 × 76.2 mm (3 in) anti-aircraft cannons. The Wakataka was classed in the Hatsutaka class in the IJN official documents. The IJN called her the unofficially.

  Ship #	Ship	Laid down	Launched	Completed	Fate
  102		15 November 1940	12 July 1941	30 November 1941	Decommissioned on 1 March 1946. Surrendered to United Kingdom United Kingdom The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...  on 17 October 1947. Transferred to Federation of Malaya Federation of Malaya The Federation of Malaya is the name given to a federation of 11 states that existed from 31 January 1948 until 16 September 1963. The Federation became independent on 31 August 1957... , and renamed Laburnum. Surrendered to Republic of Singapore Singapore Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the...  in 1968. Later, nothing more was heard.

Asadori class

• Project number was H12C. The Navy Technical Department
  Imperial Japanese Navy Technical Department
  The was the externally operating division of the Ministry of the Navy of Japan responsible for the administration of naval vessel construction. From 1923 onward, it took on the role of a research institution for the research and development of naval technologies and engineering...
  
   revised the Wakataka drawings. Only 1 vessel was planned under the Kai-Maru 5 Programme
  Modified 5th Naval Armaments Supplement Programme (Japan, 1942)
  The was one of the wartime armaments expansion plans of the Imperial Japanese Navy .-Background:In September 1942, after being defeated in the Battle of Midway, the IJN drew up a new armaments expansion plan. This plan was combined by the 5th Naval Armaments Supplement Programme and the 6th Naval...
  
  (Ship # 5039). The IJN called her the unofficially.

  Ship #	Ship	Laid down	Launched	Completed	Fate
  5039					Cancelled on 5 May 1944.