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BOB-LIFT
Marine Crane

BOB-LIFT Product Range

Marine Crane

Knuckle boom and telescopic boom marine cranes for vessels, ports and offshore work, from 800 kg to 25 t.

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About our marine cranes

A marine crane is a hydraulic crane mounted on a vessel deck or in a port to lift cargo, equipment and supplies between ship and shore. BOB-LIFT builds marine cranes with knuckle and telescopic booms.

Our knuckle boom marine cranes run from 0.8 t to 25 t, and our telescopic boom marine cranes run from 2 t to 20 t. Each crane is mounted on a deck-style test stand in our Xuzhou factory and runs every boom and slewing motion before release. Our ISO 9001 quality management certificate covers marine crane production, and we export to 120+ countries.

To choose, start with the load, the outreach you need beyond the ship's side and the free space on deck. A knuckle boom folds away to save deck space, while a telescopic boom gives a straight reach. Read the load chart at your working radius, then check that your deck structure can carry the crane. Send us the vessel details with your inquiry so our engineers can recommend a model.

Marine Cranes BrochurePDF · EN · 12 pages · 8.3 MB

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Published figures · Marine Crane

Compare the series

Figures from the BOB-LIFT technical drawings. Confirm the final specification with our team before ordering.

Model 0.8 Ton Knuckle Boom Marine Crane 0.8 Ton Knuckle Boom SQ08Z-T Series·2 configurations 1.6 Ton Knuckle Boom Marine Crane 1.6 Ton Knuckle Boom SQ1Z-T Series·2 configurations 2 Ton Knuckle Boom Marine Crane 2 Ton Knuckle Boom SQ2Z-T Series·2 configurations 2 Ton Telescopic Boom Marine Crane 2 Ton Telescopic Boom SQ2S-T Series·SQ2SA3T 3.2 Ton Knuckle Boom Marine Crane 3.2 Ton Knuckle Boom SQ3.2Z-T Series·2 configurations 3.2 Ton Telescopic Boom Marine Crane 3.2 Ton Telescopic Boom SQ3.2S-T Series·2 configurations 4 Ton Telescopic Boom Marine Crane 4 Ton Telescopic Boom SQ4S-T Series·SQ4SA3T 4 Ton Knuckle Boom Marine Crane 4 Ton Knuckle Boom SQ4Z-T Series·3 configurations 4.6 Ton Knuckle Boom Marine Crane 4.6 Ton Knuckle Boom BLZ90-T Series·2 configurations 5 Ton Knuckle Boom Marine Crane 5 Ton Knuckle Boom SQ5Z-T Series·3 configurations 5 Ton Telescopic Boom Marine Crane 5 Ton Telescopic Boom SQ5S-T Series·2 configurations 6.3 Ton Telescopic Boom Marine Crane 6.3 Ton Telescopic Boom SQ6.3S-T Series·SQ6.3SA4T 6.3 Ton Knuckle Boom Marine Crane 6.3 Ton Knuckle Boom SQ6.3Z-T Series·3 configurations 8 Ton Telescopic Boom Marine Crane 8 Ton Telescopic Boom SQ8S-T Series·2 configurations 8 Ton Knuckle Boom Marine Crane 8 Ton Knuckle Boom SQ8Z-T Series·4 configurations 10 Ton Telescopic Boom Marine Crane 10 Ton Telescopic Boom SQ10S-T Series·2 configurations 10 Ton Knuckle Boom Marine Crane 10 Ton Knuckle Boom SQ10Z-T Series·3 configurations 12 Ton Telescopic Boom Marine Crane 12 Ton Telescopic Boom SQ12S-T Series·2 configurations 12 Ton Knuckle Boom Marine Crane 12 Ton Knuckle Boom SQ12Z-T Series·5 configurations 16 Ton Knuckle Boom Marine Crane 16 Ton Knuckle Boom SQZ330T 16 Ton Telescopic Boom Marine Crane 16 Ton Telescopic Boom SQ16S-T Series·SQ16SA5T 20 Ton Knuckle Boom Marine Crane 20 Ton Knuckle Boom SQZ430T 20 Ton Telescopic Boom Marine Crane 20 Ton Telescopic Boom SQ20S-T Series·SQ20SA5T 25 Ton Knuckle Boom Marine Crane 25 Ton Knuckle Boom SQZ500T
Capacity 0.8 t 1.6 t 2 t 2 t 3.2 t 3.2 t 4 t 4 t 4.6 t 5 t 5 t 6.3 t 6.3 t 8 t 8 t 10 t 10 t 12 t 12 t 16 t 16 t 20 t 20 t 25 t
Max lifting moment 1.3 t·m 2.2 t·m 4.2 t·m 4.2 t·m 6.8 t·m 6.8 t·m 10 t·m 8.4 t·m 9.2 t·m 10.5 t·m 12.5 t·m 15.75 t·m 13.2 t·m 20 t·m 16.7 t·m 25 t·m 21 t·m 30–33 t·m 27 t·m 33 t·m 40 t·m 42.3 t·m 50 t·m 53.9 t·m
Max working radius 4.15 m 4.23 m 5.1–7.54 m 8.2 m 7.7 m 8.3–10.5 m 8 m 7.7–9.4 m 9.75–11.7 m 8.05–9.9 m 9.06–11.79 m 12.6 m 10.2–12.2 m 14–18.5 m 10.52–14.68 m 15.5–19.4 m 12.63–14.68 m 16.19–19.35 m 10.15–14.5 m 15.9 m 22.3 m 16.6 m 22 m 18 m
Max lifting height ≈ 5.5–5.7 m ≈ 5.5–5.7 m ≈ 6.5–9 m ≈ 10 m ≈ 9.5 m ≈ 10–12 m ≈ 10 m ≈ 9.5–11.5 m ≈ 12–14 m ≈ 10–12 m ≈ 10.5–13.5 m ≈ 14 m ≈ 12.5–14.5 m ≈ 16–20.5 m ≈ 13–17 m ≈ 17.5–21 m ≈ 15–17 m ≈ 18–21 m ≈ 12.5–16.5 m ≈ 18.5 m ≈ 24 m ≈ 19 m ≈ 24 m ≈ 21 m
Boom sections 3+1 3+1 2–4 3 3 3–4 3 3–4 — 3–4 3–4 4 4–5 4–5 4–6 4–5 5–6 4–5 4–6 — 5 — 5 —
Rotation angle 330° 330° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360°
Power 3.5 kW 7.5 kW 9 kW 8 kW 15 kW 14 kW 16 kW 14–15 kW 15 kW 22 kW 18 kW 22 kW 22 kW 30 kW 25 kW 30–37 kW 30 kW 42–45 kW 30 kW 45 kW 55 kW 45 kW 55 kW 55 kW
Self weight 200–220 kg 350–380 kg 590–630 kg 830 kg 1,190–1,236 kg 1,050–1,250 kg 1,500 kg 1,210–1,260 kg 1,420–1,520 kg 2,060–2,120 kg 1,850–2,100 kg 2,200 kg 1,680–1,740 kg 3,100–3,250 kg 2,470–2,730 kg 3,250–3,950 kg 2,780–2,920 kg 4,000–4,050 kg 3,900–4,400 kg 4,500 kg 5,800 kg 4,900 kg 6,950 kg 6,474 kg
Built to order View the 0.8 t series View the 1.6 t series View the 2 t series View SQ2SA3T View the 3.2 t series View the 3.2 t series View SQ4SA3T View the 4 t series View the 4.6 t series View the 5 t series View the 5 t series View SQ6.3SA4T View the 6.3 t series View the 8 t series View the 8 t series View the 10 t series View the 10 t series View the 12 t series View the 12 t series View SQZ330T View SQ16SA5T View SQZ430T View SQ20SA5T View SQZ500T

Buying guide

How to choose a marine crane for your vessel

Choose a marine crane by the load it must lift at the radius you work over the side or into the hold. Then check that your deck can carry the crane and that the vessel can power its hydraulics. BOB-LIFT has built cranes in Xuzhou, China, since 2003, and our marine cranes have gone to the Philippines, Russia, Ecuador, the USA, the Netherlands and Bangladesh. The six checks below use figures from our own drawings and load charts.

  1. 01Size it by the load at your working radius

    The capacity class is the most the crane lifts close to its column. The SQ5ZA3TJ lifts 5,000 kg at 2.1 m, 2,350 kg at 4.45 m and 1,100 kg at its full 8.05 m. At 10 t, the knuckle boom SQ10ZA6TJ lifts 10,000 kg at 2 m and 1,150 kg at 14.68 m; the telescopic SQ10SA4T lifts 10,000 kg at 2.5 m and 1,050 kg at 15.5 m. Measure the horizontal distance from the column to where the load must land, then read that line of the load chart. Our guide on how to read a crane load chart walks through it.

  2. 02Choose a knuckle boom or a telescopic boom

    A knuckle boom folds into a compact package on deck when it is not working, and its linkage lets the boom work at a reverse angle, for example down into a hold. A telescopic boom extends in a straight line for long reach: the SQ16SA5T reaches from 5.95 m to 22.3 m. At 20 t the knuckle boom SQZ430T weighs 4,900 kg and lifts 20,000 kg at 2 m and 1,910 kg at 16.6 m. The telescopic SQ20SA5T weighs 6,950 kg and lifts 20,000 kg at 2.5 m and 1,500 kg at 22 m. Compare our knuckle boom and telescopic boom marine cranes.

  3. 03Check the deck before the crane

    The crane's own weight ranges from 220 kg for the SQ08ZA3TJ+1 to 6,950 kg for the SQ20SA5T. The deck and the crane's foundation must carry that weight and the lifting moment, which reaches 53 t·m on the SQZ500T. Send us the vessel type, where the crane will stand and the deck structure. We can adapt the mounting to your vessel and will confirm it with you.

  4. 04Check that the base plate fits your deck

    The base plate is the footprint your deck or pedestal must carry, so it often decides the model. Our drawings give these sizes. The 3.2 t and 4 t knuckle boom cranes (SQ3.2ZA3TJ, SQ4ZA3TJ) and the 3.2 t telescopic SQ3.2SA4T stand on a 550 × 550 mm plate. The 4.6 to 6.3 t knuckle boom cranes (BLZ90K5TJ, SQ5ZA3TJ, SQ6.3ZA4TJ) and the 5 t and 6.3 t telescopic cranes (SQ5SA4T, SQ6.3SA4T) use a 680 × 680 mm plate with 24 bolt holes of Ø22 mm on a 600 × 600 mm square. The 8 t and 10 t cranes (SQ8ZA6TJ, SQ10ZA6TJ, SQ8SA5T, SQ10SA4T) use a Ø1,000 mm plate with a Ø930 mm bolt circle. The 12 t cranes (SQ12ZA6T, SQ12SA4T) use a Ø1,127 mm plate with a Ø1,048 mm bolt circle. The 16 t and 20 t knuckle boom cranes (SQZ330T, SQZ430T) use a Ø1,400 mm plate with a Ø1,290 mm bolt circle. Each product page shows the base plate drawing with every bolt hole.

  5. 05Match the hydraulic power

    Each crane runs on hydraulic power from the vessel or from its own power unit. The recommended supply ranges from 3.5 kW and 8 L/min (SQ08ZA3TJ+1) to 55 kW and 80 L/min (SQZ500T and SQ16SA5T; the SQ20SA5T needs 80 + 63 L/min). If the vessel has no suitable hydraulic system, we can supply an electric or a diesel hydraulic power unit. The specification table on every product page gives that model's figures.

  6. 06Plan the slewing range, corrosion protection and options

    Every model from the SQ2ZA2TJ up slews through 360°; the two smallest, the SQ08ZA3TJ+1 and SQ1ZA3TJ+1, turn through 330°. Each crane has a dedicated torque limiter and goes through several anti-rust treatments for the marine environment. Options include a winch, drill pipe, an aerial basket or a grapple, and an overhead seat or wireless remote control. Name what you need when you request a quote.

Frequently asked questions

What is a marine crane?

A marine crane, or marine deck crane, is a hydraulic crane mounted on a vessel's deck to load and unload cargo, supplies and equipment. BOB-LIFT builds marine cranes with knuckle booms and with telescopic booms.

What sizes do BOB-LIFT marine cranes come in?

Knuckle boom marine cranes come in 14 capacity classes: 0.8, 1.6, 2, 3.2, 4, 4.6, 5, 6.3, 8, 10, 12, 16, 20 and 25 t. Telescopic boom marine cranes come in 10 classes: 2, 3.2, 4, 5, 6.3, 8, 10, 12, 16 and 20 t. Maximum lifting moment (load × distance) ranges from 1.3 t·m (SQ08ZA3TJ+1) to 53 t·m (SQZ500T), and the longest reach is 22.3 m on the SQ16SA5T.

Which small marine crane suits a boat?

Start with our lightest knuckle boom models. The SQ08ZA3TJ+1 weighs 220 kg itself, lifts 800 kg close in and 220 kg at 4.15 m, and needs 3.5 kW of hydraulic power. The SQ1ZA3TJ+1 weighs 380 kg and lifts 1,600 kg at 1.39 m and 300 kg at 4.23 m. The 590 kg SQ2ZA2TJ lifts 2,000 kg close in and 750 kg at 5.1 m, and slews 360°. For a longer reach at 2 t, the telescopic SQ2SA3T weighs 830 kg and lifts 250 kg at 8.2 m.

Do you make a 15 ton marine crane?

Our capacity classes step from 12 t to 16 t. For loads around 15 t, the knuckle boom SQZ330T lifts 16,000 kg at 2 m and 1,450 kg at 15.9 m and weighs 4,500 kg. The telescopic SQ16SA5T lifts 16,000 kg at 2.5 m and reaches 22.3 m. Check the load at your working radius on the chart.

Should I choose a knuckle boom or a telescopic boom marine crane?

A knuckle boom folds compactly on deck, and its linkage can angle the boom down past obstacles. A telescopic boom extends in a straight line for long reach. Choose by your deck space, the reach you need and the loads you lift most.

How do I order a marine crane, and what warranty is included?

You can order a single unit. Tell us the vessel, where the crane will stand, your typical loads and working distances, and the options you need. We confirm the model and its configuration with you before production. Each crane comes with a 12-month warranty.

How our cranes are made

From steel
to shipment.

Photographed at our factory in Xuzhou, Jiangsu: the steps a crane goes through before it leaves.

Parts and hydraulics
01 / 10 Parts and hydraulics Boom sections, cylinders, frames and hydraulic parts are staged next to the assembly line.
Parts and welds
02 / 10 Parts and welds Boom sections, cylinders and hydraulic parts are checked in the workshop before and during assembly.
Assembly halls
03 / 10 Assembly halls Knuckle and telescopic booms are assembled in long rows under overhead cranes.
Load and function test
04 / 10 Load and function test The finished crane is mounted on the test bay and runs through lifting, slewing and outrigger functions under load.
Lift the crane onto the chassis
05 / 10 Lift the crane onto the chassis An overhead hoist holds the crane while it is placed on the truck frame in the workshop.
Fix the crane to the frame
06 / 10 Fix the crane to the frame Technicians work under the cab to secure the crane base to the chassis.
Check the finished truck
07 / 10 Check the finished truck The crane stands complete on the truck with its boom raised for inspection.
Line up the order
08 / 10 Line up the order Every crane in an order is tested, set on its base or a pallet and lined up in the hall before packing.
Wrap the crane
09 / 10 Wrap the crane Cranes are wrapped in stretch film before they leave the workshop.
Load the container
10 / 10 Load the container A hoist or a forklift moves each packed crane into the container.

Guides and news

Read before you buy

All news
BOB-LIFT SQ3.2ZA3TJ yellow folding crane on a black test frame in a bright factory hall with large windows. Marine Crane Sizes: Matching Capacity, Reach and Deck to Your Vessel Marine crane sizes from 0.8 t to 25 t in one table, with the load each model holds at full reach, how to read size at your working radius, and what your vessel must carry. Read the article BOB-LIFT SQ10ZA6TJ shows a blue boom with a winch drum and hydraulic hoses in a busy factory hall. Crane Winch Guide: When Truck and Marine Cranes Need a Winch What a winch does on knuckle boom and telescopic truck mounted and marine cranes, when a crane with a winch is worth it, what it adds in weight, how the J option works on BOB-LIFT cranes, and the daily rope checks. Read the article A row of finished green BOB-LIFT knuckle boom cranes from one order lined up in the factory hall before packing Crane Shipping from China: Container, Flat Rack or RoRo, Documents and Incoterms How a truck mounted, knuckle boom or marine crane gets from a Chinese factory to your port. Container, flat rack or RoRo, packing and lashing, documents, FOB vs CIF and the arrival check. Read the article

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