page_title: QF 6-inch naval gun
section_title: Royal Navy service
hierarchical_section_title: QF 6-inch naval gun / UK service / Royal Navy service
caption_attribution_description: Sailors on deck of four-funnel cruiser HMS Powerful, Australian Squadron, Sydney Harbour
context_page_description: The QF 6-inch 40 calibre naval gun was used by many United Kingdom-built warships around the end of the 19th century and the start of the 20th century.
  In UK service it was known as the QF 6-inch Mk I, II, III guns.
  As the 15 cm/40 41st Year Type naval gun it was used for pre-dreadnought battleships, armoured cruisers and protected cruisers of the early Imperial Japanese Navy built in UK and European shipyards. It was also the heaviest gun ever carried by a pre-Cold War destroyer.
context_section_description: As the QF 6 inch Mk I, Mk II and Mk III, the gun was used as secondary armament of pre-dreadnoughts of the 1890s and cruisers to 1905. On the armoured cruisers of the Diadem, Powerful and Edgar classes they made up most of the armament, though the latter class carried two 9.2-inch (230 mm) guns as well. The pre-dreadnought battleships of the Royal Sovereign (including the turreted HMS Hood), Centurion, Majestic and Canopus classes carried up to 12 guns.
caption: The 6 starboard casemate guns on HMS Powerful
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