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Knuckle Boom Truck Mounted Cranes

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Knuckle Boom Truck Mounted Cranes

Knuckle Boom Truck Mounted Cranes from the BOB-LIFT product catalog.

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Knuckle boom truck mounted cranes from 1.6 t to 50 t

A knuckle boom truck mounted crane, often just called a knuckle boom crane or knuckle crane, folds its boom at a joint. Folded, it packs into a small space behind the cab while the truck drives. On site it unfolds to reach over the truck body and place loads, which suits building materials, deliveries and municipal work.

BOB-LIFT currently builds knuckle boom truck mounted cranes in 18 capacity classes from 1.6 t to 50 t: 1.6, 2, 3.2, 4, 4.6, 5, 6.3, 8, 10, 12, 16, 20, 25, 28, 30, 34, 40 and 50 t. Most classes come in several configurations with different numbers of boom sections, 35 configurations in all: the 8 t class, for example, comes as the SQ8ZA4, SQ8ZA5 and SQ8ZA6. The SQZ330 to SQZ1000 cover the heavy end, from 16 t to 50 t.

If you need a straight boom instead, compare our telescopic boom truck mounted cranes.

Truck Mounted Cranes BrochurePDF · EN · 22 pages · 14.4 MB

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Published figures · Knuckle Boom Truck Mounted Cranes

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

Model 1.6 Ton Knuckle Boom Truck Mounted Crane 1.6 Ton Knuckle Boom SQ1Z Series·2 configurations 2 Ton Knuckle Boom Truck Mounted Crane 2 Ton Knuckle Boom SQ2Z Series·3 configurations 3.2 Ton Knuckle Boom Truck Mounted Crane 3.2 Ton Knuckle Boom SQ3.2Z Series·2 configurations 4 Ton Knuckle Boom Truck Mounted Crane 4 Ton Knuckle Boom SQ4Z Series·2 configurations 4.6 Ton Knuckle Boom Truck Mounted Crane 4.6 Ton Knuckle Boom BLZ90 Series·2 configurations 5 Ton Knuckle Boom Truck Mounted Crane 5 Ton Knuckle Boom SQ5Z Series·2 configurations 6.3 Ton Knuckle Boom Truck Mounted Crane 6.3 Ton Knuckle Boom SQ6.3Z Series·4 configurations 8 Ton Knuckle Boom Truck Mounted Crane 8 Ton Knuckle Boom SQ8Z Series·4 configurations 10 Ton Knuckle Boom Truck Mounted Crane 10 Ton Knuckle Boom SQ10Z Series·3 configurations 12 Ton Knuckle Boom Truck Mounted Crane 12 Ton Knuckle Boom SQ12Z Series·3 configurations 16 Ton Knuckle Boom Truck Mounted Crane 16 Ton Knuckle Boom SQZ330 20 Ton Knuckle Boom Truck Mounted Crane 20 Ton Knuckle Boom SQZ430 25 Ton Knuckle Boom Truck Mounted Crane 25 Ton Knuckle Boom SQZ500 28 Ton Knuckle Boom Truck Mounted Crane 28 Ton Knuckle Boom SQZ560 30 Ton Knuckle Boom Truck Mounted Crane 30 Ton Knuckle Boom SQZ600 34 Ton Knuckle Boom Truck Mounted Crane 34 Ton Knuckle Boom SQZ700 40 Ton Knuckle Boom Truck Mounted Crane 40 Ton Knuckle Boom SQZ800 50 Ton Knuckle Boom Truck Mounted Crane 50 Ton Knuckle Boom SQZ1000
Capacity 1.6 t 2 t 3.2 t 4 t 4.6 t 5 t 6.3 t 8 t 10 t 12 t 16 t 20 t 25 t 28 t 30 t 34 t 40 t 50 t
Max lifting moment 2.2 t·m 4.2 t·m 6.8 t·m 8.4 t·m 9.2 t·m 10.5 t·m 12.9–13.2 t·m 16.7 t·m 21 t·m 27 t·m 33 t·m 42.3 t·m 53.9 t·m 57.3 t·m 63.3 t·m 70.1 t·m 80 t·m 90 t·m
Max working radius 4.23 m 5.1–7.54 m 7.7–9.4 m 7.7–9.4 m 9.75–11.7 m 8.05–9.9 m 8.22–12.2 m 10.52–16.8 m 10.5–14.68 m 10.15–14.5 m 15.9 m 16.6 m 15.9 m 15.9 m 20.3 m 20.3 m 20.3 m 20.3 m
Max lifting height ≈ 6 m ≈ 7–9.5 m ≈ 9.5–11.5 m ≈ 9.5–11.5 m ≈ 12–14 m ≈ 10.5–12 m ≈ 10.5–14.5 m ≈ 13–19 m ≈ 13–17 m ≈ 12.5–16.5 m ≈ 18 m ≈ 19 m ≈ 18.5 m ≈ 18.5 m ≈ 23 m ≈ 23 m ≈ 23 m ≈ 23 m
Boom sections 3+1 / 4 2–4 3–4 3–4 — 3–4 3–5 4 / 5 / 6 / 6+1 4–6 4–6 — — — — — — — —
Rotation angle 330° 370° 400° 400° 380° 400° 360–380° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360° 360°
Power 7.5 kW 9 kW 14 kW 14 kW 15 kW 22 kW 22 kW 25 kW 30 kW 30 kW 45 kW 45 kW 50 kW 65 kW 65 kW 75 kW 75 kW 75 kW
Self weight 470–490 kg 650–750 kg 1,330–1,450 kg 1,350–1,460 kg 1,600–1,700 kg 2,286–2,386 kg 1,850–2,310 kg 3,050–3,500 kg 3,350–3,700 kg 4,480–4,800 kg 4,900 kg 5,500 kg 6,300 kg 6,100 kg 7,500 kg 8,500 kg 9,000 kg 10,000 kg
Built to order View the 1.6 t series View the 2 t series View the 3.2 t series View the 4 t series View the 4.6 t series View the 5 t series View the 6.3 t series View the 8 t series View the 10 t series View the 12 t series View SQZ330 View SQZ430 View SQZ500 View SQZ560 View SQZ600 View SQZ700 View SQZ800 View SQZ1000

Buying guide

How to choose a knuckle boom truck mounted crane

Choose a knuckle boom crane by the load it must lift at your real working radius. Then check that your truck can carry the crane and drive its hydraulics. The five checks below use figures from our own 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 slewing post it turns on. The SQ8ZA6 lifts 8,000 kg at 2 m, 1,820 kg at 8.51 m and 850 kg at its full 14.68 m. Measure the horizontal distance from the column to where the load must land. That is your working radius, and the load chart shows what the crane lifts there. Our guide on how to read a crane load chart walks through it.

  2. 02Choose the number of boom sections for your reach

    Within one capacity class, more boom sections give more reach but less lift at the tip. The SQ5ZA3 reaches 8.05 m and still lifts 1,100 kg there. The SQ5ZA4 reaches 9.9 m and lifts 700 kg at that distance. If your lifts rarely go past 8 m, the SQ5ZA3 is 100 kg lighter and lifts more at its full reach.

  3. 03Check the truck before the crane

    The crane's own weight ranges from 470 kg for the SQ1ZA3+1 to 10,000 kg for the SQZ1000, and it must fit within your truck's remaining payload. The SQZ600 to SQZ1000 need an outrigger span of up to 8.6 m. Send us the chassis model, wheelbase and gross vehicle weight, and we will confirm the mounting before you order. See how we handle truck mounting and export.

  4. 04Match the hydraulic supply

    Each crane is driven by the truck's power take-off (PTO) and hydraulic pump. The recommended supply ranges from 7.5 kW and 15 L/min (SQ1ZA3+1) to 75 kW and 100 L/min (SQZ800). Check that your PTO and pump can deliver this. The specification table on every product page gives that model's figures.

  5. 05Plan the slewing range and attachments

    Every model up to 5 t, plus the BLZ129K4, has a rated slewing angle of 330° to 400°, depending on the model. The SQ6.3ZA3/ZA4/ZA5 and every model from 8 t up are rated for 360° of rotation, so you can work all around the truck without repositioning. Our product pages list four optional attachments for these cranes: a hydraulic gripper, clamshell bucket, orange peel grab and timber grapple. Name the attachment when you request a quote.

Frequently asked questions

What is a knuckle boom truck mounted crane?

It is a hydraulic crane fixed to a truck chassis, with a boom that bends at a joint like a finger. Folded, the boom stays compact behind the cab. Unfolded, it lifts and places loads around the truck. Operators use it to load and unload building materials, machinery and pallets.

What sizes do BOB-LIFT knuckle boom truck cranes come in?

There are 35 configurations in 18 capacity classes from 1.6 t to 50 t. Maximum lifting moment (load × distance) ranges from 2.2 t·m (1.6 t class) to 90 t·m (SQZ1000). Maximum reach ranges from 4.23 m (1.6 t class) to 20.3 m (SQZ600 to SQZ1000).

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

A knuckle boom folds compactly behind the cab and can reach over and down past obstacles. A telescopic boom extends in a straight line. At 10 t the two types are similar in weight and lift: the knuckle boom SQ10ZA6 weighs 3,700 kg and lifts 1,150 kg at 14.68 m. The telescopic SQ10SA4 weighs 3,800 kg and lifts 1,050 kg at 15.5 m. Choose by your truck, your site and the jobs you repeat most.

What does a model code such as SQ8ZA6 mean?

In SQ8ZA6, SQ marks a truck mounted crane, 8 is its 8 t capacity class, Z means knuckle boom and A6 means six boom sections: the main boom and five hydraulic extensions. A "+1" at the end, as in SQ1ZA3+1, adds one more boom section. Some codes do not show the capacity class directly, including the SQ1ZA3+1, the heavy SQZ models and the BLZ models. Check the capacity class on each product page.

How do I order a knuckle boom truck crane, and what warranty is included?

You can order a single unit. Tell us your truck, your typical loads and working distances, and the attachment 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
Visitors from Mauritius and BOB-LIFT staff in safety helmets beside a row of red SQ6.3Z knuckle boom cranes in the Xuzhou factory Mauritius Crane Repair Company Orders an SQ6.3ZA4 Knuckle Boom Crane After Factory Visit What a crane repair specialist from Mauritius checked on our SQ6.3Z assembly line before ordering, and why one crane could open a new market for BOB-LIFT. Read the article BOB-LIFT SQZ350 operator seated on the crane while the boom lifts a black 5t test weight. Crane Operator License for Truck Mounted Cranes: US, Australia and UK Rules OSHA certification for knuckle boom and telescopic truck cranes and its two exemptions, Australia's CV vehicle loading crane licence, the UK competence rules, and where 12 of our crane sizes fall against each threshold. Read the article BOB-LIFT SQ8ZA6 shows the rear of a white truck with outriggers set and a red boom lifting a test weight. Crane Counterweight: What It Does and Why a Truck Mounted Crane Doesn’t Need One How a crane counterweight balances the tipping moment, why mobile and tower cranes need one, and how a truck mounted crane stays stable without it, using outrigger spans and lifting moments from eight of our drawings. Read the article

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