4.7 inch/45 Mk.XII (120 mm)

Description

4.7 inch/45 Mk.XII on HMAS Nizam

The 4.7 inch/45 Mk.XII is a 45-calibre, 4.7-inch (120 mm) naval gun which armed the majority of Royal Navy and Commonwealth destroyers during World War II, later being exported to many other countries.

This gun succeeded the similar World War I-era BL 4.7 inch gun, changing the cartridges from BL silk bags to separate QF in brass cases and a new horizontal sliding-block breech mechanism. The Mk XII gun was deployed in twin mountings CP Mk XIX on the Tribal-class and G-class destroyers of 1936 as well as the J-class, K-class, and N-class of 1938. 

The 4.7 inch calibre was finally superseded by the 4.5 inch calibre on the Z-class destroyers in 1943. The new 4.5 inch gun had 55-degree elevation mounts and actually fired a shell slightly heavier than that of 4.7-inch XII guns.

Vehicles equipped with this weapon

• HMS Grafton
• ORP Garland
• HMCS Haida
• HMS Jervis
• HMS Kelvin
• HMAS Nepal
• HMS Eskimo
• HMS Mohawk

General info

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Available ammunition

Penetration statistics
Ammunition	Type of warhead	Penetration @ 0° Angle of Attack (mm)
		1,000 m	2,500 m	5,000 m	7,500 m	10,000 m	15,000 m
HE Mk.VIIA	HE	35	35	35	35	35	35
SAP Mk.VA	SAP	116	92	63	44	33	29
HE-TF Mk.VIIA	HE-TF	35	35	35	35	35	35
HE-VT Mk.VIIA	HE-VT	35	35	35	35	35	35

Shell details
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (s)	Fuse sensitivity (mm)	Explosive mass (TNT equivalent) (g)	Ricochet
							0%	50%	100%
HE Mk.VIIA	HE	808	22.68	0	0.1	3,000	79°	80°	81°
SAP Mk.VA	SAP	808	22.68	0.015	5	900	47°	60°	65°
HE-TF Mk.VIIA	HE-TF	808	22.68	0	0.1	3,000	79°	80°	81°

Proximity-fused shell details
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Arming distance (m)	Trigger radius (m)	Explosive mass (TNT equivalent) (g)	Ricochet
									0%	50%	100%
HE-VT Mk.VIIA	HE-VT	808	22.68	0	0.1	244	23	3,000	79°	80°	81°

Comparison with analogues

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Usage in battles

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Pros and cons

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History

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Media

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See also

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External links

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