12 cm Mark 4, 5, 6 and 7
The Mark 4 was built in the Boforsfactories in Sweden, the Mark 5, 6 and 7 were built under license by Wilton Feijenoord in Schiedam, Holland. The difference was the mounts used.
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| Rear turret of Willem van der Zaan |
| Gun specs | ||
| Manufacturer | Bofors, Sweden | |
| Gun type | Bofors 4.7 inch Mark 4, 5, 6 and 7. | |
| Purpose | Low angle (seatargets only) | |
| Bore | 120 mm (4.7 inch) | |
| Classes used on | Mark 4: | 1st batch Admiralen-class destroyers |
| Mark 5: | 2nd batch Admiralen-class destroyers | |
| Mark 6: | Van Kinsbergen-class sloop | |
| Mark 7: | Van der Zaan-class minelayer | |
| Date of design | 1924 | |
| Date in service | 1926 (commissioning first Admiralen-class destroyer) | |
| Length | 50 calibers (6,39 m) | |
| Gunweight | 4 tons | |
| Initial velocity | 2950 feet/sec | |
| Rate of fire | 10 rounds/minute | |
| Shell specs | ||
| Shell types | HE shells | |
| Shell weight | 53 lbs | |
| Range (max) | 19.500 m @ 35 degrees | |
| Mount specs | ||
| Mount types | Mark 4/5 | Non- or half shielded open mounts |
| Mark 6: | Armoured turret | |
| Mark 7: | Armored shields | |
| Mount armor | ||
| Elevation | Mark 4: | -5/ +30 degrees |
| Mark 5 / 7: | -5 / +35 degrees | |
| Mark 6: | -5 / +45 degrees | |
| Train | - 150 / + 150 degrees | |
| Train method | manually | |
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