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BOB-LIFT

Knuckle Boom Marine Cranes

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25 Ton Knuckle Boom Marine Crane

Model SQZ500T

Choose your configuration

Winch

With or without a winch? Read our winch guide

Standard production model

Max lifting capacity
25,000kg
Max lifting moment
53.9t·m
Max reach
18m
Lifting height
≈ 21m
Self weight
6,474kg
+86 158 5249 9415 info@boblift.com
25 Ton Knuckle Boom Marine Crane

Engineering data

Technical Specifications

SQZ500T

Former model
SQ25ZA8T

Model code explained

SQ
BOB-LIFT crane
Z
Knuckle boom
500
Lifting moment class (53.9 t·m)
T
Marine version

Former model no. SQ25ZA8T

Choose your configuration

Model Configuration Max reachLifting height
SQZ500T No winch 18 m ≈ 21 m
SQZ500TJ With winch 18 m ≈ 21 m

Knuckle boom marine cranes can be built with or without a winch.

Lifting

Max Lifting Capacity
25,000kg
Max Lifting Moment
53.9t·m
Rotation Angle
360°
Max Working Radius
18m
Max Lifting Height
≈ 21 m
Max Boom Angle
80°

Hydraulics and power

Recommended Power
55kW
Hydraulic System Flow
80L/min
Hydraulic System Pressure
35MPa
Oil Tank Capacity
260 L

Machine

Self Weight
6,474kg
Compare all Knuckle Boom Marine Cranes

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

Dimensions and load chart

SQZ500T dimension drawing and load chart

Select the drawing to view it full size.

How much it lifts at each reach The further the hook is from the crane, the less it can lift: 25,000 kg at 2 m, 2,000 kg at 18 m.
Lifts (kg) 25,000 12,300 9,300 6,900 5,300 4,300 3,600 3,000 2,000
Reach (m) 2 4.2 5.6 7.4 9.4 11.3 13.5 15.9 18

Reach is measured from the slewing centre to the hook. Figures from the drawing above.

Product details · SQZ500T

25 Ton Knuckle Boom Marine Crane

25 t knuckle boom marine crane

More videos2

Series video: it shows a crane of the same capacity and boom type, so paint and options can differ from this model.

More videos

The SQZ500T is a 25 ton knuckle boom marine crane. It lifts 25,000 kg at 2.0 m, 9,300 kg at 5.6 m and 2,000 kg at its full 18 m reach, with a 53.9 t·m maximum lifting moment and 360° slewing. It weighs 6,474 kg and was previously listed as the SQ25ZA8T.

Where the 25 ton SQZ500T fits

The SQZ500T is the largest knuckle boom crane in our marine range. Its boom runs out from 4.53 m to 18 m and keeps useful capacity at long radius: 5,300 kg at 9.4 m, 4,300 kg at 11.3 m and 3,000 kg at 15.9 m. Folded, it measures 2,649 × 1,652 × 2,636 mm, so it stows compactly on deck. That suits barges, cargo and supply vessels, ports and quays that lift heavy deck cargo, machinery, steel and project loads every day.

If your loads stay under 20 t, the SQZ430T sits on the same Ø1,400 mm base plate with the same 30-bolt pattern, is rated at 20,000 kg and reaches 16.6 m, at 1,574 kg less self weight. Send us the heaviest load, the radius it must reach and a deck drawing, and we check them against both load charts.

Load at each radius

2 m 25,000 kg
4.2 m 12,300 kg
5.6 m 9,300 kg
7.4 m 6,900 kg
9.4 m 5,300 kg
11.3 m 4,300 kg
13.5 m 3,600 kg
15.9 m 3,000 kg
18 m 2,000 kg

Figures from the SQZ500T load chart, with the boom horizontal. With the boom raised to 80°, the hook reaches about 21 m above the base. Download the SQZ500T load chart (PDF)

Deck mounting dimensions

These figures come from the SQZ500T dimension drawing. Your shipyard or naval architect designs the pedestal and the deck reinforcement for the crane’s 6,474 kg self weight and its 53.9 t·m maximum lifting moment.

Base plate Ø1,400 mm
Mounting bolt holes 30 × Ø33 mm
Bolt pattern PCD Ø1,290 mm
Centre hole in the base plate Ø700 mm
Folded size (L × W × H) 2,649 × 1,652 × 2,636 mm
Hydraulic supply 80 L/min at 35 MPa, about 55 kW
Oil tank 260 L

We can adapt the mounting to your vessel’s deck, for example by changing the pedestal height. Download the SQZ500T dimension drawing (PDF)

Corrosion protection for sea duty

The T in SQZ500T marks the marine version, which receives a multi-layer anti-rust treatment for salt air and spray. How long a crane lasts on the water 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.

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

Knuckle Boom Marine Crane

Product technical advantages

  • High-strength steel structure

    High-strength steel structure

    Compact, light and strong steel structure.

  • Custom installation

    Custom installation

    Pedestal mounting tailored to your deck.

  • Optional attachments

    Optional attachments

    Winch, drill pipe, basket or grapple.

  • Operation modes

    Operation modes

    Manual levers, overhead seat or wireless remote.

  • Dual four-bar linkage

    Dual four-bar linkage

    Reverse-angle reach for flexible work.

  • Dedicated torque limiter Load moment limiter, safety certified.
  • Marine anti-rust treatment Multi-layer anti-rust process for sea duty.

Manufacturing & delivery

From our workshop to your port

  1. Assembly 01

    Assembly

    Slewing base, column and booms are assembled by hand in our Xuzhou workshop.

  2. 02

    Marine test stand

    Mounted on a deck-style stand, the crane runs every boom and slewing motion before release.

  3. Final check 03

    Final check

    Finished cranes are inspected and lined up for dispatch.

  4. Packing 04

    Packing

    Wrapped in film and strapped to protect paint and hydraulics in transit.

  5. Container loading 05

    Container loading

    Loaded into containers at the factory and shipped to your port.

Shipping & warranty

Shipping, warranty and documents

Shipping

Lead time and container loading are confirmed with your quotation.

Warranty and parts

12 months

Send the model, serial number and a photo or video of the issue; our team guides the repair and ships the parts.

Order from 1 unit

Documents

FAQ

Questions about the SQZ500T

About the SQZ500T

Can the SQZ500T lift 25 tons at full reach?

No. It lifts 25,000 kg at 2.0 m, and the capacity falls with radius to 2,000 kg at 18 m. Check the load chart on this page at your working radius.

What is the difference between the SQZ500T and the SQZ430T?

Both mount on a Ø1,400 mm base plate with 30 bolts on a Ø1,290 mm pitch circle. The SQZ500T is rated at 25,000 kg and 53.9 t·m, reaches 18 m and weighs 6,474 kg. The SQZ430T is rated at 20,000 kg and 42.3 t·m, reaches 16.6 m and weighs 4,900 kg. Choose the SQZ500T for heavier loads and longer reach.

What base plate and bolts does the SQZ500T need on deck?

A Ø1,400 mm base plate with 30 × Ø33 mm holes on a Ø1,290 mm pitch circle and a Ø700 mm centre hole. Your yard designs the pedestal and the deck reinforcement for the crane’s 6,474 kg self weight and 53.9 t·m lifting moment.

What hydraulic power does the SQZ500T need?

80 L/min at 35 MPa from about 55 kW, with a 260 L oil tank. It can run on the vessel’s hydraulic system or on an electric or diesel power unit we can provide.

Is the SQZ500T approved by a classification society?

No. Our hydraulic marine cranes for harbours, barges, workboats and inshore vessels are not certified by a classification society. If your vessel or project needs class approval, confirm it with us before you order.

Not answered here?

Send us your question and our team replies with answers for your site.

+86 158 5249 9415

Ordering and service

Which configuration should we choose for this model?

Send the load, the outreach you need over the ship's side, the vessel type and where the crane will stand on deck. Our engineers confirm a practical model and mounting before quotation.

How is the crane mounted on the vessel?

The crane stands on its base plate, fixed to the deck or to a raised pedestal, and the base plate size is on the product drawing. Send us the deck structure at the crane position: we adapt the mounting to your vessel and confirm it with you.

Does this crane suit our sea conditions?

Tell us where the vessel works, whether you lift in port or at sea, and the conditions you expect during lifting. Our engineers check them against the load chart and confirm whether this model suits the job before quotation.

How is the crane protected against corrosion?

Tell us whether the vessel works in salt water or fresh water and where the crane sits on deck. We confirm the paint and surface protection for your conditions in writing with the quotation.

What is the delivery time, and which documents come with the order?

Lead time depends on the configuration, order quantity and destination, and we confirm it in writing with your quotation. Each order ships with a commercial invoice, packing list and bill of lading, plus the product documents required for the confirmed order.

Do you help with installation and after-sales service?

Your shipyard fits the crane with our installation guidance and remote technical support. Cranes carry a 12-month warranty, we reply to service requests within 12 hours, and common spare parts ship within 48 hours.

Guides and news

Read before you buy

All news

Need a crane matched to your vessel and lifting task?

Send the load, the outreach over the ship's side, the vessel type, the crane position on deck and the destination port. BOB-LIFT will help match a practical configuration.

Contact Engineer

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