Structured Manufacturing Data (2026)

Jib Tip Sheave Assembly

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Jib Tip Sheave Assembly used in the Other Transport Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Jib Tip Sheave Assembly is characterized by the integration of Sheave (Pulley) and Sheave Pin / Axle. In industrial production environments, manufacturers listed on CNFX commonly emphasize Alloy Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A pulley assembly mounted at the tip of a luffing jib for guiding and supporting hoist ropes or cables.

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Product Specifications

Technical details and manufacturing context for Jib Tip Sheave Assembly

Definition
The Jib Tip Sheave Assembly is a critical component located at the outermost end of a luffing jib on a crane. It consists of one or more sheaves (pulleys) housed within a protective frame or housing. Its primary function is to guide the hoist rope or cable from the main boom or winch system, changing its direction to allow for vertical lifting operations at the jib tip. It supports the rope's load, minimizes wear through smooth rotation, and is essential for the safe and efficient operation of the luffing mechanism.
Working Principle
The assembly operates on the principle of a rotating sheave reducing friction. As the hoist rope is tensioned by the winch, it runs over the grooved surface of the sheave(s). The sheave rotates on bearings within its housing, allowing the rope to change direction with minimal resistance and wear while supporting the load applied to the hook or lifting attachment at the jib's end.
Common Materials
Alloy Steel, High-Strength Cast Steel
Technical Parameters
  • Sheave groove diameter and rope diameter compatibility (mm) Customizable
Components / BOM
  • Sheave (Pulley)
    The grooved wheel that guides and supports the hoist rope, rotating to minimize friction.
    Material: Alloy Steel
  • Sheave Pin / Axle Part
    A hardened steel shaft on which the sheave rotates, fixed within the side plates.
    Material: Hardened Alloy Steel
  • Side Plates / Housing Part
    Structural frames that house the sheave(s) and pin, providing mounting points to the jib tip.
    Material: High-Strength Steel Plate
  • Bearings (Bushings or Roller Bearings) Part
    Located between the sheave and the pin to facilitate smooth, low-friction rotation.
    Material: Bronze (Bushings) or Steel (Roller Bearings)
  • Lubrication Fitting Part
    A grease nipple or port for periodic lubrication of the bearings/sheave pin.
    Material: Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Jib Tip Sheave Assembly.

Jib Head Sheave Block Luffing Jib Tip Pulley luffing jib pulley assembly jib tip sheave replacement parts high-strength cast steel sheave industrial crane cable guide pulley heavy-duty jib tip bearing assembly

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Luffing Jib
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (mechanical assembly)
other spec: Max rope tension: 50 kN, Max rope diameter: 32 mm, Max rotational speed: 200 RPM
temperature: -40°C to +80°C
Media Compatibility
✓ Steel wire ropes ✓ Synthetic fiber ropes ✓ Galvanized cables
Unsuitable: Corrosive marine environments without protective coatings
Sizing Data Required
  • Rope diameter (mm)
  • Maximum working load (kN)
  • Required sheave groove profile

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Wire rope groove wear and deformation
Cause: Abrasive wear from wire rope contact under high tension loads, exacerbated by misalignment, insufficient lubrication, or use of undersized or worn wire ropes that concentrate stress on specific groove areas.
Bearing seizure or excessive play
Cause: Contamination ingress (dust, moisture, debris) leading to lubrication breakdown, inadequate or improper lubrication intervals, or overloading causing bearing fatigue and eventual failure.
Maintenance Indicators
  • Audible squealing, grinding, or clicking noises during operation indicating bearing issues or rope misalignment
  • Visible uneven wear patterns, cracks, or deep scoring in the sheave grooves, or excessive wobble during rotation
Engineering Tips
  • Implement regular alignment checks and tension monitoring to ensure the wire rope runs centrally in the groove, reducing asymmetric wear and extending sheave life.
  • Establish a proactive lubrication schedule using manufacturer-recommended greases, and install protective seals or shields to prevent contamination of bearings and sheave surfaces.

Compliance & Manufacturing Standards

Reference Standards
ISO 4301-1:2016 Cranes - Classification ANSI/ASME B30.5-2018 Mobile and Locomotive Cranes DIN 15020-1:1974 Cranes - Principles Relating to Rope Drives
Manufacturing Precision
  • Sheave Bore Diameter: ±0.05 mm
  • Sheave Groove Profile: ±0.1 mm from nominal contour
Quality Inspection
  • Magnetic Particle Inspection for surface cracks
  • Dimensional Verification with Coordinate Measuring Machine

Factories Producing Jib Tip Sheave Assembly

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 materials are used in this jib tip sheave assembly?

This assembly is constructed from durable alloy steel and high-strength cast steel components for maximum load capacity and longevity in demanding industrial applications.

How does the jib tip sheave assembly function in transport equipment?

Mounted at the tip of a luffing jib, it guides and supports hoist ropes or cables, ensuring smooth cable movement and proper load distribution during lifting operations.

What maintenance does this sheave assembly require?

Regular lubrication via the integrated fitting and inspection of bearings, sheave pin, and side plates are essential to maintain optimal performance and prevent premature wear.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Other Transport Equipment Manufacturing.

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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