INDUSTRY COMPONENT

Stick (Dipper)

The stick (dipper) is a critical structural component in hydraulic excavators that connects the boom to the bucket, enabling precise digging and material handling operations.

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Component Specifications

Definition
The stick, also known as the dipper or arm, is a primary structural member in hydraulic excavator boom assemblies. It functions as the intermediate linkage between the boom (main arm) and the bucket attachment, transmitting hydraulic forces to control digging depth, reach, and bucket orientation. This component is subjected to complex dynamic loads including bending, torsion, and compression during excavation cycles.
Working Principle
The stick operates on hydraulic cylinder actuation principles. Hydraulic cylinders mounted between the boom and stick provide controlled extension/retraction, while additional cylinders between the stick and bucket control bucket articulation. This creates a compound lever system that multiplies force and provides precise positional control through hydraulic pressure regulation.
Materials
High-strength low-alloy steel (HSLA) ASTM A572 Grade 50 or equivalent, with yield strength ≥345 MPa. Critical stress areas may use quenched and tempered steel ASTM A514 with yield strength ≥690 MPa. Weld zones utilize matching strength filler metals.
Technical Parameters
  • Length Range 2.5-8.5 meters
  • Pin Diameters 80-200 mm
  • Wall Thickness 25-50 mm
  • Weight Capacity 15-45 tons
  • Hydraulic Pressure 280-350 bar
  • Operating Temperature -40°C to +50°C
Standards
ISO 10262, ISO 12100, DIN 15018, ISO 3457

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Stick (Dipper).

excavator stick dipper arm hydraulic arm component boom and stick assembly heavy machinery parts construction equipment components excavator maintenance hydraulic cylinder linkage Stick (Dipper) Stick (Dipper) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Hydraulic Arm (Boom and Stick)

The primary hydraulic-powered structural assembly of a mini excavator responsible for digging, lifting, and material handling.

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Engineering Analysis

Risks & Mitigation
  • Structural fatigue failure
  • Pin connection wear leading to slop
  • Hydraulic cylinder mounting point cracking
  • Corrosion in marine/chemical environments
  • Overload bending deformation
FMEA Triads
Trigger: Cyclic loading exceeding material fatigue limits
Failure: Crack initiation and propagation at stress concentration points
Mitigation: Implement regular NDT inspections, redesign stress concentrations with smoother transitions, use higher fatigue-rated materials
Trigger: Inadequate lubrication of pivot pins
Failure: Accelerated wear leading to increased clearance and impact loading
Mitigation: Establish scheduled lubrication protocols, use sealed and lubricated pin systems, monitor pin clearance regularly
Trigger: Exceeding rated load capacity
Failure: Plastic deformation or catastrophic bending failure
Mitigation: Install load monitoring systems, operator training on capacity limits, implement electronic load limiting controls

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Pin bore diameters: H8 tolerance, Straightness: ≤1mm per meter length, Parallelism between pin centers: ±0.5mm
Test Method
Ultrasonic testing per ISO 17640, Magnetic particle inspection per ISO 9934, Load testing to 125% of rated capacity per ISO 10262

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between stick and boom in hydraulic excavators?

The boom is the primary lifting arm attached to the excavator's house, while the stick (dipper) is the secondary arm connecting the boom to the bucket. The boom provides vertical lift capacity, while the stick controls digging depth and horizontal reach.

How often should stick components be inspected?

Visual inspections should occur daily, with detailed structural inspections every 250-500 operating hours. Critical areas include pin connections, weld seams, and stress concentration zones. Ultrasonic testing is recommended annually or after 2,000 operating hours.

What are common failure modes for excavator sticks?

Fatigue cracking at stress concentration points, pin bore wear and elongation, hydraulic cylinder mounting point failures, and corrosion in harsh environments. Proper maintenance and load management significantly extend component lifespan.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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