15 cm No 6, 7 & 8
These three guns are usually listed together as mounted together on two different classes of ships, the Java-class cruisers and the Flores-class sloops, both dating from the late twenties. The Mk.6 were Krupp guns obtained from Germany, originally built for a fortress. Eight were purchased directly from Krupp, the other twelve were built under license by Bofors in Sweden. The Mk.7 and Mk.8 were Krupp guns built under license by Bofors as well.
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| Gun specs | ||
| Manufacturer | Krupp, Germany Bofors, Sweden |
|
| Purpose | Low Angle (seatargets only) | |
| Bore | 149,1 mm (5.9 inch) | |
| Classes used on | No 6: Java class cruisers No 7: Flores-class sloops No 8: Johan Maurits van Nassau (I) |
|
| Length | 50 calibers (actual length 7,895 m) | |
| Dates in service | No 6 & 7: 1925 No 8: 1933 |
|
| Gunweight | No 6 & 7: 7,24 tons No 8: 7,33 tons |
|
| Initial velocity | 900 metres per second | |
| Shell specs | ||
| Shell weight | 46 kg (HE) | |
| Range (by WW 2) | No 6 & 7: 16.700 metres * No 8: 18.500 metres ** |
|
| Mount specs | ||
| Elevation | +25 / -10 degrees | |
| Mount types | Used behind armoured shields on all classes | |
| Mount armour | No 6: 100 mm (front) 25 mm (sides) No 7: 14 - 80 mm No 8: |
|
| Mount weight | 21,720 tons | |
| * Range of the guns of Java during the battle of the Java Sea. Flores and Soemba, with guns of Sumatra had a similar range **: Maximum range of the guns of Johan Maurits van Nassau during her bombardment of a shore battery in May 1940 |
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Sources
Jane's fighting ships of the World, 1931 edition
J. Anten et al "Hr.Ms. Kruisers 'Java' and 'Sumatra'
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