4.6 Ton Knuckle Boom Marine Crane

Where the 4.6 ton BLZ90K5TJ fits

The BLZ90K5TJ is the long-reach option in the 4–5 t knuckle boom class: four boom sections reach 11.7 m and still lift 590 kg there. That reach suits quays, barges and work pontoons where boats moor a few metres away, or vessels that load cargo across a wide deck. It is rated at 4,600 kg at 1.9 m and weighs 1,520 kg.

We size a marine crane by the load and the radius you need, not by vessel length. Send us the heaviest load, the furthest point it must reach and a deck drawing, and we check them against the BLZ90K5TJ load chart and the deck space it needs when folded.

Deck mounting dimensions

These figures come from the BLZ90K5TJ dimension drawing. Your shipyard or naval architect designs the pedestal and the deck reinforcement for the crane’s 1,520 kg self weight and its 90 kN·m maximum lifting moment.

We can adapt the mounting to your vessel’s deck, for example by changing the pedestal height. Download the BLZ90K5TJ dimension drawing (PDF)

Corrosion protection for sea duty

The T in BLZ90K5TJ marks the marine version, which receives a multi-layer anti-rust treatment for salt air and spray. How long a crane lasts in a harbour still depends on routine care: rinse it with fresh water after salt-water work, grease the slewing bearing and pins on schedule, and check hoses, fittings and the winch rope for corrosion and wear.

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