5 Ton Knuckle Boom Marine Crane

Where the 5 ton SQ5ZA3T fits

The SQ5ZA3T 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 2,060 kg and a 680 × 680 mm base plate, it suits supply boats, barges and quays that move drums, pallets, small machinery and deck equipment.

Rated capacity always depends on radius. At 6.2 m the SQ5ZA3T lifts 1,600 kg and at 8.05 m it lifts 1,100 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 SQ5ZA3T load chart.

Load at each radius

Figures from the SQ5ZA3T load chart with the boom horizontal. Do not lift more than the chart shows at your working radius. Download the SQ5ZA3T load chart (PDF)

Deck mounting dimensions

These figures come from the SQ5ZA3T dimension drawing. Your shipyard or naval architect designs the pedestal and the deck reinforcement for the crane’s 2,060 kg self weight and its 10.5 t·m maximum lifting moment.

We can adapt the mounting to your vessel’s deck, for example by changing the pedestal height. Download the SQ5ZA3T dimension drawing (PDF)

Corrosion protection for sea duty

The T in SQ5ZA3T 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

Where the 5 ton SQ5ZA3TJ fits

The SQ5ZA3TJ lifts 5,000 kg close in and 1,100 kg at its 8.05 m reach, which suits workboats, tugs, fishing vessels and small cargo boats that land heavy items next to the crane rather than far over the side. Its version without a winch, the SQ5ZA3T, is the crane our Egypt customer fitted to steel harbour workboats. Folded it measures 2,321 × 712 mm, so it stows low on an aft deck.

Need a longer, straight boom instead? Compare the 5 ton telescopic boom marine crane (SQ5SA4T).

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 SQ5ZA3TJ load chart and the deck space it needs when folded.

Deck mounting dimensions

These figures come from the SQ5ZA3TJ dimension drawing. Your shipyard or naval architect designs the pedestal and the deck reinforcement for the crane’s 2,120 kg self weight and its 10.5 t·m maximum lifting moment.

We can adapt the mounting to your vessel’s deck, for example by changing the pedestal height. Download the SQ5ZA3TJ dimension drawing (PDF)

Corrosion protection for sea duty

The T in SQ5ZA3TJ 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

Our Egypt case study follows SQ5ZA3T knuckle boom marine cranes from shipyard outfitting to a finished harbour workboat. See the Egypt workboat project

Customers in Egypt, Russia and Bangladesh have sent photos of the SQ5ZA3T, the same 5 t class without the winch. See their photos under Customer feedback

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

Where the 5 ton SQ5ZA4T fits

The SQ5ZA4T 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 2,120 kg and a 680 × 680 mm base plate, it suits supply boats, barges and quays that move drums, pallets, small machinery and deck equipment.

Rated capacity always depends on radius. At 6.2 m the SQ5ZA4T lifts 1,600 kg and at 8.05 m it lifts 1,100 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 SQ5ZA4T load chart.

Load at each radius

Figures from the SQ5ZA4T load chart with the boom horizontal. Do not lift more than the chart shows at your working radius. Download the SQ5ZA4T load chart (PDF)

Deck mounting dimensions

These figures come from the SQ5ZA4T dimension drawing. Your shipyard or naval architect designs the pedestal and the deck reinforcement for the crane’s 2,120 kg self weight and its 10.5 t·m maximum lifting moment.

We can adapt the mounting to your vessel’s deck, for example by changing the pedestal height. Download the SQ5ZA4T dimension drawing (PDF)

Corrosion protection for sea duty

The T in SQ5ZA4T 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