Dipper (Stick): Hydraulic Pressure 25-35 MPa

Component Specifications

Definition

The dipper, commonly referred to as the stick or arm in hydraulic excavators, is a critical structural component that articulates between the boom and the bucket attachment. It functions as the intermediate linkage in the excavator's kinematic chain, transmitting hydraulic force from the stick cylinder to control bucket positioning, digging depth, and reach. This component enables precise material excavation, loading, and placement through controlled extension and retraction movements.

Working Principle

The dipper operates on hydraulic cylinder actuation principles. Hydraulic fluid under pressure extends or retracts the stick cylinder, causing the dipper to pivot around its connection point to the boom. This mechanical advantage allows the bucket to follow precise digging trajectories while maintaining optimal force transmission. The component's geometry and pivot points are engineered to maximize digging force, reach, and control throughout the working range.

Materials

High-strength alloy steel (typically ASTM A572 Grade 50 or equivalent), heat-treated for wear resistance and fatigue strength. Critical areas may include reinforced sections with additional plating or hard-facing materials.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	2.5-8 meters (varies by excavator size)
Weight	500-5000 kg
Working Load	10-150 kN
Pivot Bearings	Tapered roller or spherical bearings
Surface Treatment	Shot peened and painted with corrosion-resistant coating
Hydraulic Pressure	25-35 MPa

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 6165, ISO 6746, DIN 70020

Parent Products

This component is used in the following industrial products

Hydraulic Excavator

A heavy construction machine that uses hydraulic power to excavate and move earth, rocks, and other materials.

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Engineering Analysis

Risks & Mitigation

Structural fatigue cracking
Bearing wear leading to misalignment
Hydraulic cylinder seal failure
Corrosion in pivot areas
Overload deformation

FMEA Triads

Trigger: Cyclic loading exceeding material fatigue limits
Failure: Crack propagation in high-stress areas
Mitigation: Implement regular non-destructive testing (NDT), maintain proper lubrication, avoid shock loading

Trigger: Contaminated hydraulic fluid
Failure: Stick cylinder seal degradation and pressure loss
Mitigation: Maintain hydraulic filtration systems, monitor fluid quality, follow scheduled maintenance intervals

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2 mm on critical bore dimensions, ±1° on angular alignment

Test Method

Ultrasonic testing for material integrity, coordinate measuring machine (CMM) for dimensional verification, load testing to 150% of rated capacity

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 Dipper (Stick)

Manufacturer profiles associated with Dipper (Stick).

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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

Related Components

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between dipper and stick in excavator terminology?

In industrial terminology, 'dipper' and 'stick' are often used interchangeably to refer to the same component - the articulated arm between boom and bucket. Regional preferences may vary, with 'stick' being more common in North America and 'dipper' in other markets.

How often should excavator dippers be inspected for wear?

Dipper components should undergo visual inspection every 250 operating hours, with detailed structural inspection including crack testing every 1000 hours or according to manufacturer recommendations. High-stress areas around pivot points and cylinder mounts require particular attention.

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.

Dipper (Stick)