2 Ton Knuckle Boom Marine Crane

Where the 2 ton SQ2ZA2TJ fits

The SQ2ZA2TJ keeps the deck clear with a two-section boom that folds to 2,104 × 609 mm. With 2,000 kg close in and 750 kg at its 5.1 m reach, it fits small workboats, fishing vessels and pontoons that load stores, fish boxes or a small tender over the side. Its 590 kg self weight is light enough for many small aluminium or steel hulls, subject to the deck check described below.

Need a longer, straight boom instead? Compare the 2 ton telescopic boom marine crane (SQ2SA3T).

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 SQ2ZA2TJ load chart and the deck space it needs when folded.

Deck mounting dimensions

These figures come from the SQ2ZA2TJ dimension drawing. Your shipyard or naval architect designs the pedestal and the deck reinforcement for the crane’s 590 kg self weight and its 4.2 t·m maximum lifting moment.

We can adapt the mounting to your vessel’s deck, for example by changing the pedestal height. Download the SQ2ZA2TJ dimension drawing (PDF)

Corrosion protection for sea duty

The T in SQ2ZA2TJ 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.

From our customers

Customers in Greece and China have sent photos and video of the earlier SQ2ZA2T configuration. See their photos under Customer feedback

All knuckle boom marine cranes · How to choose a marine crane

Where the 2 ton SQ2ZA4T fits

The SQ2ZA4T has no winch, so loads hang from the boom hook: that suits deck cargo, barge work and quay handling where the lift stays above deck level. With a self weight of 630 kg and a 780 × 500 mm base plate, it suits workboats, fishing boats and small barges that lift provisions, nets, pumps and spare parts.

Rated capacity always depends on radius. At 5.4 m the SQ2ZA4T lifts 700 kg and at 6.4 m it lifts 460 kg, so check the weight of your heaviest regular load at the distance you need before you choose a tonnage.

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 SQ2ZA4T load chart.

Load at each radius

Figures from the SQ2ZA4T load chart with the boom horizontal. Do not lift more than the chart shows at your working radius. Download the SQ2ZA4T load chart (PDF)

Deck mounting dimensions

These figures come from the SQ2ZA4T dimension drawing. Your shipyard or naval architect designs the pedestal and the deck reinforcement for the crane’s 630 kg self weight and its 4.2 t·m maximum lifting moment.

We can adapt the mounting to your vessel’s deck, for example by changing the pedestal height. Download the SQ2ZA4T dimension drawing (PDF)

Corrosion protection for sea duty

The T in SQ2ZA4T 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 and fittings for corrosion.

Warranty and service

BOB-LIFT covers the whole crane for 12 months. Common spare parts leave the factory within 48 hours, and our service team answers within 12 hours and can guide repairs by video. Cranes ship from Lianyungang, Qingdao or Shanghai.

All knuckle boom marine cranes · How to choose a marine crane