Foot/Heel Pin Assembly: Pin Diameter 50-150 mm

Component Specifications

Definition

The Foot/Heel Pin Assembly is a precision-engineered mechanical assembly used in luffing mechanisms of cranes and similar equipment. It consists of hardened steel pins, bushings, retaining mechanisms, and mounting hardware that create robust pivot connections between the boom foot section and the rotating base or heel structure. This assembly facilitates controlled angular movement while transferring substantial compressive, tensile, and shear loads during luffing operations.

Working Principle

The assembly operates on the principle of rotational bearing surfaces and mechanical fastening. The hardened pins serve as axles that allow rotational movement between connected components, while the bushings provide wear-resistant bearing surfaces. Retaining mechanisms (such as cotter pins, lock nuts, or retaining rings) secure the pins in position, maintaining alignment and preventing unintended disengagement during dynamic loading cycles.

Materials

High-strength alloy steel (typically AISI 4140 or 4340) for pins, hardened to 45-55 HRC; bronze or polymer composite bushings (bronze alloy C93200 or UHMW-PE); corrosion-resistant steel for mounting hardware; optional protective coatings (zinc plating, phosphate coating, or paint).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pin Length	200-600 mm
Pin Diameter	50-150 mm
Pin Hardness	45-55 HRC
Load Capacity	50-500 kN static, 25-250 kN dynamic
Surface Finish	Ra 0.8-1.6 μm
Bushing ID Tolerance	H7
Operating Temperature	-20°C to +80°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 286-2, DIN 6325, ISO 2768-mK, DIN 7172

Parent Products

This component is used in the following industrial products

Luffing Mechanism

A mechanical system that enables a luffing jib crane to change the angle of its jib relative to the horizontal plane.

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Engineering Analysis

Risks & Mitigation

Pin shear failure under overload
Bushing wear leading to excessive clearance
Corrosion in marine environments
Improper installation causing misalignment
Fatigue cracking in high-cycle applications

FMEA Triads

Trigger: Insufficient lubrication
Failure: Accelerated bushing wear and increased friction
Mitigation: Implement scheduled lubrication program with appropriate high-pressure grease

Trigger: Overload beyond design limits
Failure: Pin deformation or shear fracture
Mitigation: Install load monitoring systems and operator training on load limits

Trigger: Corrosive environment exposure
Failure: Pitting and reduced cross-sectional strength
Mitigation: Apply corrosion-resistant coatings and implement regular inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Pin diameter: h9, Bushing bore: H7, Concentricity: 0.1 mm TIR, Surface hardness: ±3 HRC

Test Method

Ultrasonic testing for internal defects, hardness testing per ISO 6508, dimensional verification with CMM, 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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Foot/Heel Pin Assembly

Manufacturer profiles associated with Foot/Heel Pin Assembly.

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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 maintenance is required for Foot/Heel Pin Assemblies?

Regular inspection for wear on pins and bushings, lubrication of bearing surfaces every 250-500 operating hours, torque verification on retaining hardware during scheduled maintenance, and replacement when wear exceeds manufacturer specifications.

How do I determine the correct pin diameter for my application?

Calculate based on maximum shear and bending loads using engineering formulas, consider safety factors (typically 3-5 for dynamic loads), and verify compatibility with existing mounting interfaces and bushing specifications.

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.

Foot/Heel Pin Assembly