Tower Mast for Luffing Jib Cranes - Specifications and Verification

Product Specifications

Technical details and manufacturing context for Tower Mast

Definition

The tower mast is the primary vertical structural element of a luffing jib crane, serving as the central support column that elevates the crane's working height. It provides the necessary stability and rigidity to withstand the loads from the jib, hoisting mechanisms, and lifted materials, while also serving as the mounting point for the slewing mechanism and operator's cab. Constructed from high-strength structural steel, the mast is typically composed of modular sections that are bolted together to achieve the desired height. The cross-section is square or rectangular, with a width ranging from 1.2 to 2.0 meters, and each standard section is 3 to 6 meters long, weighing between 1.5 and 4.5 tons. The material grades commonly used are Q345B to Q460C, with yield strengths of 345 to 460 MPa and tensile strengths of 470 to 640 MPa, conforming to GB/T 1591. The mast sections are hot-dip galvanized with a zinc coating thickness of 80 to 120 micrometers per ISO 1461, and connections are made using high-strength bolts of grade 10.9 per ISO 898-1. The rated load capacity at minimum radius ranges from 2 to 20 tons, and the maximum lifting height is 20 to 80 meters, depending on the number of sections. The tolerance for mast verticality is ≤1/1000 per meter of height, as per ISO 4306-1. The design wind speed for in-service operation is 20 to 42 m/s per ISO 4302, and the operating temperature range is -20 to 40°C. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier.

Working Principle

The tower mast functions as a cantilevered column, transferring compressive, bending, and torsional loads from the crane's superstructure (jib, counter-jib, hoist) down to the foundation. Its design ensures structural integrity under dynamic operational loads and environmental forces like wind. The mast's modular construction allows for height adjustment by adding or removing sections, and its bolted connections facilitate assembly and disassembly. The verticality tolerance ensures proper alignment, which is critical for safe operation. The mast's strength and stiffness are derived from the high-strength steel and the cross-sectional geometry, which resists buckling and deformation. The surface treatment provides corrosion resistance, extending the service life. The mast also serves as the mounting point for the slewing mechanism, enabling the crane to rotate. The design must account for the maximum load at minimum radius, wind loads, and temperature effects, ensuring that the mast remains stable and within allowable stress limits throughout its operational envelope.

Common Materials

High-strength structural steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Load Capacity	2–20 t	Maximum load at minimum radiusISO 4301-1
Maximum Lifting Height	20–80 m	Depends on number of mast sections
Mast Section Length	3–6 m	Standard section length for transport
Mast Section Weight	1.5–4.5 t	Weight per standard section
Mast Cross-Section Width	1.2–2.0 m	Square or rectangular section
Material Grade	Q345B–Q460C	High-strength low-alloy steelGB/T 1591
Yield Strength	345–460 MPa	Minimum yield strengthGB/T 1591
Tensile Strength	470–640 MPa	Ultimate tensile strengthGB/T 1591
Surface Treatment	Hot-dip galvanized 80–120 μm	Zinc coating thicknessISO 1461
Connection Bolt Grade	10.9	High-strength bolts for mast jointsISO 898-1
Tolerance for Mast Verticality	≤1/1000	Deviation per meter of heightISO 4306-1
Design Wind Speed	20–42 m/s	Max wind for in-service operationISO 4302
Operating Temperature Range	-20–40 °C	Standard operating range

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

Standard Mast Section Part
Modular vertical segment that can be stacked to achieve desired crane height.

Material: High-strength steel
Connection Bolts/Clamps Part
Secure adjacent mast sections together to form a continuous load-bearing column.

Material: Alloy steel
Climbing Frame/Attachment Points Part
Provides interfaces for attaching the climbing mechanism during crane erection/height changes.

Material: Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Tower Mast.

Applied To / Applications

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

Luffing Jib Crane

View system integration details

Manufacturers of Tower Mast

Manufacturer profiles associated with Tower Mast.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the typical material used for tower masts?

The tower mast is typically made of high-strength structural steel, with material grades ranging from Q345B to Q460C, as per GB/T 1591. The yield strength is 345 to 460 MPa, and tensile strength is 470 to 640 MPa. These are reference values; the actual grade must be confirmed with the manufacturer for the specific model.

How is the tower mast height adjusted?

The mast is composed of modular sections, each 3 to 6 meters long, that are bolted together. The maximum lifting height ranges from 20 to 80 meters, depending on the number of sections used. The height can be increased or decreased by adding or removing sections, but the final configuration must be verified with the manufacturer to ensure compliance with load and stability requirements.

What standards apply to the tower mast?

Relevant standards include ISO 4301-1 for rated load capacity, ISO 4306-1 for verticality tolerance, ISO 4302 for wind loads, ISO 1461 for hot-dip galvanizing, and ISO 898-1 for bolt grades. These standards serve as verification references; the manufacturer must confirm that the specific product meets the applicable requirements.

What is the maximum wind speed for operation?

The design wind speed for in-service operation is 20 to 42 m/s, as per ISO 4302. However, the actual allowable wind speed may vary depending on the crane configuration and the manufacturer's specifications. Always consult the operator's manual and the manufacturer for the specific model.

Data Basis

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

Preliminary Technical Classification

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pressure:	N/A (structural component, not pressure vessel)
other spec:	Max wind speed: 20 m/s operational, 42 m/s survival; Max dynamic load: 500 kN; Fatigue cycles: 2×10^6 at design stress
temperature:	-40°C to +50°C (operational), -60°C to +70°C (storage)

Tower Mast

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards