Jib/Boom Component for Jib Cranes | Specifications & Standards

Product Specifications

Technical details and manufacturing context for Jib/Boom

Definition

The jib/boom is the primary load-bearing arm of a jib crane, responsible for extending the crane's operational radius. It provides the necessary reach to position loads precisely within the crane's working envelope. The boom's design directly determines the crane's maximum lifting capacity at various distances from the mast or support column. Constructed from high-strength or alloy steel, the boom is engineered to withstand the dynamic loads encountered during lifting operations. Its configuration may be fixed, luffing (able to change angle), or telescopic, depending on the crane design and application requirements. The rated lifting capacity, typically ranging from 0.5 to 20 tonnes, is specified at a given outreach, which can extend up to 15 meters. The boom length itself may vary from 2 to 15 meters, with an angle range from 0 to 75 degrees from horizontal. For jib cranes, the slewing angle can be up to 360 degrees, allowing full rotation. Lifting speeds range from 2 to 20 meters per minute, and slewing speeds from 0.5 to 2 revolutions per minute. The boom weight depends on its length and capacity, typically between 0.5 and 8 tonnes. Material grades such as Q235B to Q355B are commonly used, with surface treatment to Sa2.5 per ISO 8501-1. Operating temperature range is -20 to 60 degrees Celsius, and the wind speed limit for in-service operation is 20 meters per second per ISO 4302. These parameters serve as reference ranges; actual values must be confirmed with the manufacturer for specific models and applications. Standards like ISO 4301-1 provide classification and rating guidelines. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement or use.

Working Principle

The jib/boom acts as a cantilevered beam, transferring the load moment from the lifted object through its structure to the crane's mast or supporting column. Its length and structural integrity define the maximum safe working radius and load capacity. It may be fixed, luffing (able to change angle), or telescopic, depending on the crane design. The boom's cross-section and material are selected to resist bending and torsional stresses. During operation, the load induces a bending moment that is highest at the support point. The boom's angle and outreach determine the effective lifting capacity, which decreases as the outreach increases. Proper design ensures stability and prevents overloading. Regular inspection for fatigue cracks, deformation, and corrosion is essential to maintain structural integrity.

Common Materials

High-strength steel, Alloy steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Lifting Capacity	0.5–20 t	Maximum load at specified outreachISO 4301-1
Maximum Outreach	2–15 m	Horizontal distance from crane center to hook
Boom Length	2–15 m	Overall length of the boom structure
Boom Angle Range	0–75 °	Inclination from horizontal
Slewing Angle	0–360 °	Full rotation for jib cranes
Lifting Speed	2–20 m/min	No-load to full-load speed
Slewing Speed	0.5–2 r/min	Rotation speed of the boom
Material Grade	Q235B–Q355B	Structural steel for boom fabricationGB/T 1591
Boom Weight	0.5–8 t	Depends on length and capacity
Operating Temperature	-20–60 °C	Extended range available on request
Wind Speed Limit	20 m/s	For in-service operationISO 4302
Surface Treatment	Sa2.5	Blast cleaning before paintingISO 8501-1

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 Foot
The connection point where the boom attaches to the crane's mast or slewing ring, designed to handle high bending moments and shear forces.

Material: Forged or cast steel
Boom Head
The outermost end of the boom where the hoist block, hook, or other lifting attachment is connected via sheaves or a pulley system.

Material: Steel
Lattice Structure or Box Section Part
The primary load-bearing structure of the boom, designed as a lattice (for lighter weight) or a box section (for higher strength and rigidity) to resist bending and buckling under load.

Material: High-strength steel tubes or plates
Sheave Pins/Bushings Part
Provide mounting points for the hoist rope sheaves at the boom head, allowing the rope to run smoothly and change direction.

Material: Alloy steel, often with hardened surfaces

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Jib/Boom.

Applied To / Applications

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

Jib Crane

View system integration details

Manufacturers of Jib/Boom

Manufacturer profiles associated with Jib/Boom.

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Frequently Asked Questions

What is the typical rated lifting capacity of a jib/boom?

The rated lifting capacity typically ranges from 0.5 to 20 tonnes, depending on the outreach and boom configuration. The exact capacity for a specific model must be confirmed with the manufacturer.

What materials are commonly used for jib/boom construction?

High-strength steel and alloy steel are commonly used. Material grades such as Q235B to Q355B are typical, but the specific grade depends on the design and application.

What standards apply to jib/boom components?

Relevant standards include ISO 4301-1 for crane classification, ISO 4302 for wind load, and ISO 8501-1 for surface preparation. These standards serve as references for procurement and verification.

How does the boom angle affect lifting capacity?

The boom angle influences the outreach and the effective lifting capacity. As the angle from horizontal increases, the outreach decreases, allowing higher loads. Conversely, lower angles increase outreach but reduce capacity. Always consult the load chart for the specific crane.

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 dynamic load capacity: 1-50 tons, Max span: 3-30 meters, Max wind load: 150 km/h operational, 200 km/h survival
temperature:	-40°C to +80°C (standard steel), -60°C to +150°C (special alloys)

Jib/Boom

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards