Jib Tip Sheave Assembly

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.

This assembly is designed for use in other transport equipment manufacturing, specifically for cranes with luffing jibs. The sheaves are typically made from high-strength cast steel (e.g., ZG270-500) and may be heat-treated to achieve a surface hardness of 40–50 HRC for wear resistance. The housing and other structural parts are often fabricated from alloy steel. The assembly is engineered to accommodate wire ropes with diameters ranging from 16 to 40 mm, with sheave diameters between 400 and 1200 mm, and groove angles of 30 to 45 degrees, all in accordance with ISO 4308-1 and ISO 4309. The rated load capacity per sheave is between 50 and 200 kN, and the bearing system typically uses deep groove ball bearings (series 6205–6220) with a basic rating life (L10h) of 30,000 to 50,000 hours per ISO 281. The operating temperature range is -20 to 80 degrees Celsius, and the ingress protection rating is IP54 to IP65 per IEC 60529. The total weight of the assembly can vary from 150 to 800 kg depending on size and material.

For procurement and verification, it is essential to confirm model-specific values and standards with the legal manufacturer or supplier. The listed standards (ISO, DIN, GB/T, IEC) serve as reference points for design and testing, but do not imply certification or compliance of any specific product. Always verify the actual specifications for your application.

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. The groove angle and diameter are matched to the rope size to ensure proper support and minimize wear. The bearings are selected to handle the radial and axial loads, and the housing protects the internal components from environmental contaminants. Regular inspection of the sheave grooves, bearings, and housing is necessary to detect wear or damage that could compromise safe operation.

Common Materials

Alloy Steel, High-Strength Cast Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Load Capacity	50–200 kN	Maximum working load per sheaveISO 4308-1
Rope Diameter	16–40 mm	Must match groove profileISO 4309
Sheave Diameter	400–1200 mm	Ratio to rope diameter per standardISO 4308-1
Groove Angle	30–45 °	Affects rope support and wearISO 4308-1
Bearing Type	6205–6220	Deep groove ball bearing seriesDIN 625
Bearing Life	30000–50000 h	L10h basic rating lifeISO 281
Operating Temperature	-20–80 °C	Grease and material limits
Ingress Protection	IP54–IP65	Dust and water resistanceIEC 60529
Sheave Material	ZG270-500	Cast steel, heat treatedGB/T 11352
Surface Hardness	40–50 HRC	For wear resistanceISO 18265
Weight	150–800 kg	Depends on size and material

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

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.

Applied To / Applications

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

Luffing Jib

View system integration details

Manufacturers of Jib Tip Sheave Assembly

Manufacturer profiles associated with Jib Tip Sheave 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 · Page last updated 16 September 2026

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Frequently Asked Questions

What is the primary function of a jib tip sheave assembly?

It guides and supports the hoist rope at the tip of a luffing jib, changing the rope's direction to enable vertical lifting. It also supports the load and reduces wear on the rope.

What materials are commonly used for the sheaves?

The sheaves are typically made from high-strength cast steel, such as ZG270-500, and may be heat-treated to achieve a surface hardness of 40–50 HRC. Other components may use alloy steel.

What standards are relevant for this component?

Relevant standards include ISO 4308-1 for crane design and rope selection, ISO 4309 for rope inspection, ISO 281 for bearing life, IEC 60529 for ingress protection, and GB/T 11352 for cast steel. Always verify compliance with the manufacturer.

How should I select the correct assembly for my crane?

Selection depends on the rope diameter, required load capacity, sheave diameter, groove angle, and environmental conditions. Consult the manufacturer or supplier to confirm that the assembly meets your specific application requirements and standards.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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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

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards