Editorial Technical Reference

Telescopic Boom

This page explains how Telescopic Boom is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A multi-section hydraulic boom that extends and retracts to adjust the crane's reach and lifting height.

Product Specifications

Technical details and manufacturing context for Telescopic Boom

Definition
The telescopic boom is the primary load-bearing and positioning component of a rough terrain crane, consisting of multiple nested steel sections that slide within each other via hydraulic cylinders. It enables the crane to extend its reach horizontally and vertically while maintaining structural integrity under heavy loads in challenging off-road environments. The boom is typically made of high-strength or alloy steel, with material grades ranging from Q345B to Q960E depending on the required length and capacity. The number of sections typically ranges from 3 to 6, allowing a compact retracted length for transport while achieving a maximum extended length of 10 to 60 meters. The rated lifting capacity at minimum boom length is 5 to 50 tonnes, derating as the boom extends. Extension and retraction times vary from 20 to 90 seconds and 15 to 70 seconds, respectively, affecting cycle times. The operating pressure is 20 to 35 MPa, and the boom operates within a temperature range of -20°C to +50°C. Maximum wind speed for operation is 9.8 to 14.1 m/s, above which operation must stop to prevent tipping. The boom assembly weight ranges from 1.5 to 8.5 tonnes, influencing crane stability and transport. Standards such as ISO 4305, and ISO 4302 may apply to lifting capacity, pressure, and wind speed, respectively, but these must be verified for the specific model. Always confirm model-specific values and standards with the legal manufacturer or supplier.
Working Principle
Hydraulic cylinders push and pull the nested boom sections, allowing controlled extension and retraction. The boom sections are typically rectangular or trapezoidal in cross-section for optimal strength-to-weight ratio, with locking mechanisms that secure sections at desired lengths. The extension and retraction are achieved by sequencing the hydraulic cylinders, which are controlled by the crane's hydraulic system. The operator adjusts the boom length to position the load, and the locking mechanisms engage to maintain the set length during lifting operations. The boom's structural design ensures that it can withstand the bending moments and compressive forces imposed by the load and its own weight. The hydraulic system must maintain the required operating pressure to support the load, and safety devices prevent overloading and excessive wind exposure.
Common Materials
High-strength steel, Alloy steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Lifting Capacity5–50 tAt minimum boom length; derates as boom extends.ISO 4305
Maximum Boom Length10–60 mFully extended length; affects reach and height.
Boom Sections3–6More sections allow longer retracted length for transport.
Extension Time20–90 sFull extension time; affects cycle time.
Retraction Time15–70 sFull retraction time; affects cycle time.
Operating Pressure20–35 MPaBelow 20 MPa may not lift rated load.
Boom Material GradeQ345B–Q960EHigher grade for longer booms or higher capacity.GB/T 1591
Operating Temperature Range-20–+50 °CBelow -20°C may require special steel and seals.
Maximum Wind Speed9.8–14.1 m/sAbove this, operation must stop to prevent tipping.ISO 4302
Weight1.5–8.5 tBoom assembly weight; affects crane stability and transport.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Boom Sections
    Nested structural members that extend and retract
    Material: High-strength steel
  • Hydraulic Cylinders
    Provide force to extend and retract boom sections
    Material: Steel with chrome-plated rods
  • Pins and Locks Part
    Secure boom sections at desired extension lengths
    Material: Alloy steel
  • Sheaves and Pulleys
    Guide and support hoist cables along the boom
    Material: Steel or composite materials

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Max 350 bar (system pressure)
flow rate: 30-120 L/min (hydraulic flow)
temperature: -20°C to +60°C
slurry concentration: Not applicable (hydraulic fluid only)
Media Compatibility
✓ Hydraulic oil (ISO VG 46) ✓ Synthetic hydraulic fluid ✓ Biodegradable hydraulic fluid
Unsuitable: Saltwater/marine environments without corrosion protection
Sizing Data Required
  • Maximum lifting capacity (tons)
  • Required working radius (meters)
  • Maximum boom extension length (meters)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Hydraulic cylinder seal failure
Cause: Contamination of hydraulic fluid with particulate matter leading to abrasive wear, or chemical degradation from incompatible fluids or excessive heat causing seal hardening and cracking.
Structural fatigue cracking in boom sections
Cause: Cyclic loading from repeated extension/retraction cycles combined with stress concentrations at weld joints or pin connections, often accelerated by overloading or improper operation.
Maintenance Indicators
  • Audible hydraulic fluid leakage or hissing during operation indicating seal failure or cylinder damage
  • Visible misalignment or uneven extension of boom sections suggesting worn bushings, bent pins, or structural deformation
Engineering Tips
  • Implement strict hydraulic fluid cleanliness protocols with regular filtration and analysis to prevent abrasive wear in cylinders and valves
  • Establish and enforce load moment indicator (LMI) system calibration schedules and operator training to prevent structural overloading during operation

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 10567:2007 - Cranes - Hydraulic telescopic booms ANSI/ASME B30.5 - Mobile and Locomotive Cranes DIN 15018-1 - Cranes; principles for steel structures; calculation

Quoted from the published standard.

Manufacturing Precision
  • Boom section straightness: +/-0.5mm per meter
  • Pin hole diameter tolerance: +0.02mm/-0.01mm
Quality Inspection
  • Magnetic Particle Inspection (MPI) for weld integrity
  • Load testing to 125% of rated capacity
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Telescopic Boom

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

THHI
Jiangsu, CN
Founded 1992
Also makes: Spreader, Offshore Crane, Ship Loader and 7 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “5T15M Telescopic Boom Crane UAE”
View source page ↗ cnthhi.com · recorded 2026-08-22
CNS Machinery (Xuzhou) Co., Ltd.
Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescoping Boom Crane”
View source page ↗ cnsmach.com · recorded 2026-08-30
DFLIFT
Henan, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic Boom Lifts”
View source page ↗ dflift.com · recorded 2026-09-16
Henan Sino Lift Co.,ltd.
Xinxiang, Henan, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic Boom Lift”
View source page ↗ cnsinolift.com · recorded 2026-09-16
Jiangsu OUCO Heavy Industry and Technology Co.,Ltd.
Jiangsu, CN
Also makes: Remote Control System, Spreader, Offshore Crane and 5 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic Boom Crane”
View source page ↗ ouco-group.com · recorded 2026-08-28
Jining Jiubang Construction Machinery Equipment Co., Ltd.
Jining, Shandong, CN
Also makes: Articulated Boom, Truck Chassis, Truck Crane and 1 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic Boom Platform”
View source page ↗ jobanggroup.com · recorded 2026-09-16
Kaiping Zhonghe Machinery Manufacturing Co., Ltd.
Guangdong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Excavator Telescopic Boom”
View source page ↗ excavatorboomarm.com · recorded 2026-09-16
MRT Lift Equipment Co., Ltd.
Jinan, Shandong, CN
Also makes: Articulated Boom
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic Boom Lift”
View source page ↗ mrtlift.com · recorded 2026-09-16
OUCO Industry
Wuxi, Jiangsu, CN
Also makes: Spreader, Telescopic Crane, Air Compressor and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic boom crane”
View source page ↗ ouco-industry.com · recorded 2026-09-16
Saintyol DAWIN Machinery
Shandong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic boom shotcrete pump”
View source page ↗ saintyoldawin.com · recorded 2026-08-28
SANY Group
Taiwan, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic Boom Lift”
View source page ↗ sanyglobal.com · recorded 2026-08-27
Shandong Cathay Machinery Co., Ltd.
Jinan, Shandong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Telescopic Boom Lift”
View source page ↗ cathaylift.com · recorded 2026-09-16
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Frequently Asked Questions

What is a telescopic boom used for?

A telescopic boom is a load-bearing component of a crane that extends and retracts to adjust the crane's reach and lifting height. It is commonly used on rough terrain cranes to position loads in challenging off-road environments.

How does a telescopic boom extend and retract?

The boom consists of nested steel sections that slide within each other. Hydraulic cylinders push and pull the sections to extend or retract the boom. Locking mechanisms secure the sections at the desired length during operation.

What are the typical parameters of a telescopic boom?

Typical parameters include rated lifting capacity of 5-50 t, maximum boom length of 10-60 m, 3-6 boom sections, extension time of 20-90 s, retraction time of 15-70 s, operating pressure of 20-35 MPa, material grade Q345B-Q960E, operating temperature -20 to +50 °C, maximum wind speed 9.8-14.1 m/s, and weight 1.5-8.5 t. These are reference ranges; verify for the specific model.

What standards apply to telescopic booms?

Standards such as ISO 4305 (rated lifting capacity) and ISO 4302 (wind speed) may be referenced. However, compliance must be verified with the legal manufacturer or supplier for the specific boom model.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Telescopic Boom.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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