Stick (Dipper): Weight Capacity 15-45 tons

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

Parameter	Typical range	Notes & selection driver
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

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

Standards

ISO 10262, ISO 12100, DIN 15018, ISO 3457

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Stick (Dipper)

Manufacturer profiles associated with Stick (Dipper).

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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

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Stick (Dipper)