Dipper Stick: Pin Diameters 50-100 mm, Working Load 5-25 tons

Component Specifications

Definition

The dipper stick is a critical structural component in backhoe assemblies that transmits hydraulic force from the boom to the bucket, enabling precise digging, lifting, and material placement operations. It functions as an intermediate linkage that determines the machine's digging depth, reach, and bucket positioning accuracy.

Working Principle

The dipper stick operates as a lever arm in a hydraulic linkage system. Hydraulic cylinders mounted between the boom and dipper stick provide rotational force, while additional cylinders between the dipper stick and bucket control bucket orientation. This creates a compound mechanical advantage that multiplies hydraulic force for efficient excavation.

Materials

High-strength low-alloy (HSLA) steel ASTM A572 Grade 50 or equivalent, with yield strength ≥345 MPa and tensile strength ≥450 MPa. Critical stress areas may use quenched and tempered alloy steels like ASTM A514.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	1.5-3.5 meters (varies by machine size)
Weight	150-800 kg
Working Load	5-25 tons
Pin Diameters	50-100 mm
Maximum Bending Moment	50-300 kN·m

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 7135, DIN 15061, SAE J1177

Parent Products

This component is used in the following industrial products

Backhoe Assembly

The integrated assembly that forms the digging and material handling mechanism of a backhoe loader.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking at stress concentration points
Pin and bushing wear leading to slop
Overloading causing permanent deformation
Corrosion in harsh environments

FMEA Triads

Trigger: Cyclic loading exceeding material endurance limit
Failure: Fatigue crack propagation leading to structural failure
Mitigation: Implement regular NDT inspections, design with adequate safety factors (≥3:1), use stress-relieving manufacturing processes

Trigger: Inadequate lubrication of pivot points
Failure: Accelerated wear of pins and bushings, reduced precision
Mitigation: Follow manufacturer's lubrication schedule, use sealed bearing systems, monitor pin clearance regularly

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1.5 mm on pin bore diameters, ±2 mm on overall length, angular alignment within 0.5 degrees

Test Method

Static load testing to 150% of rated capacity, fatigue testing to 100,000 cycles at 75% load, dimensional verification per ISO 2768-mK

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

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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

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Frequently Asked Questions

What is the difference between a dipper stick and a boom?

The boom is the primary lifting arm attached to the machine's mainframe, while the dipper stick is the secondary arm connecting the boom to the bucket. The dipper stick provides finer control of bucket positioning and digging depth.

How often should dipper sticks be inspected?

Visual inspections should occur daily for cracks or deformation. Detailed non-destructive testing (magnetic particle or ultrasonic) should be performed every 500-1000 operating hours or as specified by the equipment manufacturer.

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