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China Factory Cat320 55feet Long Reach Boom and Stick for Cater-Pillar Cat320 Excavator

Product Details

Certification: CE, ISO9001: 2000, SGS

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Minimum Order Quantity: 1

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Specifications

Description

Specifications

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Boom Length:	8800mm	Arm Length:	7200mm
Max Dig Height:	12500mm	Max Dig Depth:	10800mm
Max Extensive Scope:	15500mm	Folding Height:	3400mm
Bucket Capacity:	0.5cbm	Suit Excavator Tonnage:	20ton
Material:	Q345B (S355) + Q690D (S690QL)	Total Length:	15380mm
Weight:	4000kg	Boom Cylinder:	Original Cylinders
Arm Cylinder:	Original Cylinder	Bucket Cylinder:	One Unit
High Pressure Hoses:	4 Units

Boom Length:	8800mm
Arm Length:	7200mm
Max Dig Height:	12500mm
Max Dig Depth:	10800mm
Max Extensive Scope:	15500mm
Folding Height:	3400mm
Bucket Capacity:	0.5cbm
Suit Excavator Tonnage:	20ton
Material:	Q345B (S355) + Q690D (S690QL)
Total Length:	15380mm
Weight:	4000kg
Boom Cylinder:	Original Cylinders
Arm Cylinder:	Original Cylinder
Bucket Cylinder:	One Unit
High Pressure Hoses:	4 Units

Description

China Factory Cat320 55feet Long Reach Boom and Stick for Cater-Pillar Cat320 Excavator

Cat320 55-Foot Long Reach Boom and Stick — Product Overview

This factory-built long reach boom and arm configuration is engineered for the Caterpillar Cat320 excavator, extending reach to 55 feet for deep excavation, dredging, and long-distance material handling. Each set is supplied as a complete, ready-to-install package with matched cylinders, linkage, and hydraulic components.

Standard Supply Specifications

Component	Quantity	Component	Quantity
Long boom	1 unit	Long arm	1 unit
Bucket cylinder	1 unit	Standard bucket	1 unit
Pins	8 units	"H" linkage	1 set
High-pressure hoses	4 units	Steel tube	4 units
Boom cylinder	Uses original cylinders	Arm cylinder	Uses original cylinder

Working Dimensions by Model

Model	LDB120	LDB200	LDB220	LDB200	LDB300	LDB350	LDB400	LDB450
Total length (mm)	13000	15380	15380	18000	18000	20000	22000	24000
Weight (kg)	3000	4000	4200	4900	5200	6000	6500	7000
B — Max dig depth (mm)	9000	11340	11370	13000	13000	15000	16500	18000
A — Max extensive scope (mm)	12500	15100	15100	17500	17600	19600	21600	23600
C — Max dig height (mm)	11300	12510	12610	13720	13720	14920	16100	17300
D — Folding height (mm)	2900	2980	3040	3210	3210	3210	3400	3400
Bucket volume (m³)	0.3	0.4	0.4	0.4	0.4	0.5	0.6	0.6
Excavator tonnage (ton)	10–16	20–22	22–25	20–25	30	35	40	45

Construction Features and Manufacturing Quality

1. Material Selection

Standard long reach boom: all Q345B steel construction.
Heavy-duty long reach and excavators above 40 tons: top and bottom plates use Q690D steel, with remaining sections in Q340B steel.
Q345B steel is equivalent to S355 steel in Europe.
Q690D steel is equivalent to S690QL steel in Europe.

2. Internal Reinforcement Structure

Internal cavities are spaced by vertical and horizontal reinforcement plates at regular intervals, delivering superior structural rigidity and load distribution across the full boom and arm length.

3. Edge Preparation

All steel plates are beveled by beveling machine before welding, ensuring full-penetration weld joints and consistent weld quality.

4. Welding Process

Welded with mixed gas of argon and carbon dioxide — argon content 80%, carbon dioxide content 20%.
Welded by robotic welding machine for consistent penetration and repeatable joint quality.

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