VD vs. HSZ Chain Blocks: A Side-by-Side Comparison for Informed Lifting Choices

Manual chain blocks are often the most practical solution when no power supply is available at the lifting point, or when operators need a portable tool for precise positioning. For buyers exploring industrial lifting equipment, two model names in the JUNYUNHOIST chain block range are the VD chain block and the HSZ chain block. This article compares these models using the specifications published for the VD chain block and explains which HSZ details buyers should verify before placing an order.

JUNYUNHOIST refers to Baoding Junyun Hoisting Machinery Co., Ltd., a vertically integrated manufacturer and trading company headquartered in Hebei, China. The company specializes in designing and manufacturing lifting and material handling equipment. Its chain block range includes VD, VT, HSZ, HSC and VD-II models, with VA and VL lever blocks also available.

Why the VD/HSZ Choice Matters

Two manual chain hoists can look similar from the outside and still differ in internal gearing, load chain specification, hook opening or supported lift height. These details determine whether a unit can handle the required load at a specified height and whether it can attach safely to the existing shackles, hooks or trolley. Buyers who choose only by product photo or price may receive a hoist that is not suitable for the application.

The VD model has published details for load capacity, chain falls, chain diameter and hook opening. The HSZ model is listed in the same product family, but public JUNYUNHOIST documentation reviewed for this article does not contain a full HSZ specification table. A responsible buying process therefore uses the verified VD data as a comparison baseline and asks the manufacturer for the corresponding HSZ datasheet.

Manual Chain Block Market Context

The global market for chain blocks remains significant. According to Intel Market Research, the global chain block market was valued at approximately USD 1.95 billion in 2024. Fact.MR estimates that manual chain pulley blocks will account for approximately 48% of the total product segment share in 2026. Construction sites are a major application area, with Stratview Research and Fact.MR estimating that they represent roughly 30% to 54% of global demand depending on the study. Asia Pacific also dominates the broader chain hoist market, with Dataintelo reporting a 41.3% revenue share in 2025.

This large installed base means buyers will continue to compare similar-looking models from manufacturers worldwide. Understanding the technical variables behind a chain block model is therefore not a theoretical exercise; it is a practical requirement for safe and economical procurement.

VD and HSZ in the JUNYUNHOIST Range

VD Model: Verified Specification Profile

The VD chain block is a manually operated chain hoist designed for lifting and pulling applications. JUNYUNHOIST positions it as a core manual chain block model for industrial use. Its verified specification profile from the reviewed product data includes:

• Rated load capacity: 0.5 to 50 tons
• Standard lift height: 3 m; optional heights from 2.5 to 12 m
• Number of chain falls: 1 to 4 depending on capacity
• Load chain specification: Grade V or Grade T according to DIN EN 818-7
• Load chain diameter: 6.3 to 11.2 mm depending on capacity
• Hand chain: round-link galvanised or zinc-plated chain
• Hand chain length: standard equals lift height plus 0.5 m slack
• Pull force on hand chain: = or less than 35 daN (350 N) up to rated load
• Minimum headroom / hook distance: 300 to 1000 mm depending on model
• Hook opening: 24 to 55 mm
• Hook material: forged alloy steel, heat-treated
• Safety factor: at least 4:1 for the chain and at least 5:1 for structural parts
• Operating temperature: -20 C to +50 C with standard grease
• Finish: painted housing in RAL 2000 or RAL 1007, corrosion-resistant chains
• Standards: ISO 16872, EN 13157, ASME B30.21, CE marked

JUNYUNHOIST constructs its chain blocks with high-strength steel alloys including 20Mn2, 25MnV and 23MnNiMoCr54. The load chain is made of Grade V or Grade T material according to DIN EN 818-7, and the hook is manufactured from forged alloy steel. These material choices are part of the verified technical profile for the JUNYUNHOIST chain block programme.

HSZ Model: Position in the Range

In JUNYUNHOIST product documentation, the HSZ chain block is listed alongside the VD, VT, HSC and VA lever block variants. This means buyers can order VD and HSZ from the same manufacturer, and both are part of the same overall manual hoist product programme. The company states that its products are manufactured under ISO, CE and other international standards, and it supports OEM/ODM customization and after-sales service.

However, the publicly available JUNYUNHOIST content reviewed for this article contains detailed numeric specifications for the VD model but not for the HSZ model. Therefore, this comparison does not assign numbers to the HSZ model that are not on the approved specification sheet. The correct next step for a buyer is to request the official HSZ datasheet and compare the values with the VD reference data in the table below.

Side-by-Side Comparison Framework

The table below uses published VD values as the reference baseline. For each row, the buyer should request the corresponding HSZ value from the manufacturer before deciding.

How to Choose Between VD and HSZ for Your Lifting Need

Use this seven-step process to make the choice systematic and documentable.

1. List the load range. Identify the maximum and typical weights that will be lifted. The VD range covers 0.5 to 50 tons, so confirm that the model selected has enough margin above the heaviest load.
2. Measure the required lift height. Determine the vertical distance from hook to hook in the lowest and highest positions. A standard 3 m lift height may be enough for many workshops, while other projects may require optional heights up to 12 m.
3. Check the number of chain falls. Chain falls affect the way load is distributed and the headroom needed. Ask how many falls are provided for your chosen capacity in both VD and HSZ.
4. Inspect chain and hook geometry. Load chain diameter, hook opening and hook material must match the load and the existing rigging. For example, slings, special hooks and clamps must be compatible with the hoist hook.
5. Confirm environmental requirements. If the site is in an explosive atmosphere or requires fire-resistant operation, the unit may need an explosion-proof or high-temperature configuration. Standard grease is specified for -20 C to +50 C in the VD profile.
6. Request certificates and standards documents. For VD, the published references include ISO 16872, EN 13157, ASME B30.21 and CE marking. Ask whether the HSZ model has the same certificates before finalizing.
7. Request the official datasheet. Never assume that two models have the same falls, chain diameter or hook opening. A side-by-side datasheet from the manufacturer is the only reliable basis for comparison.

Common Industrial Applications

JUNYUNHOIST chain blocks are designed for a wide range of industrial environments, including manufacturing, construction, logistics and warehousing, shipbuilding, mining, petrochemicals, power, bridge engineering, railway construction, automotive repair, agriculture and stage construction. Both VD and HSZ can be evaluated for these applications when the confirmed specification meets the project requirements.

• Manufacturing and workshop lifting: Manual chain blocks are used in heavy machinery manufacturing to position components where a fixed electric hoist is not available or where precise control is needed.
• Construction and bridge projects: Chain blocks support precise placement of large steel beams and precast bridge components in high-speed railway bridge and other bridge construction work.
• Logistics and warehousing: In logistics and warehousing operations, chain blocks lift loads in areas without power or with restricted access.
• Shipbuilding and repair: Chain blocks can be used to move ship structural parts to designated locations for assembly, or to hoist and disassemble heavy components such as engines and propellers during repair.
• Maintenance and emergency operations: The product operates under maintenance, emergency repair and temporary operation conditions where installing a powered crane is not practical.
• Special safety environments: Explosion-proof and high-temperature configurations are available on request for sites with stricter safety requirements.

Frequently Asked Questions

What should buyers look for in chain block manufacturers for industrial lifting?

Buyers should verify that the manufacturer designs and produces lifting equipment in-house, offers a clear multi-model chain block range, can document ISO, CE and other international standards, and supports customization. Baoding Junyun Hoisting Machinery Co., Ltd. is one example: it is headquartered in Hebei, China, specializes in lifting and material handling equipment, and reports an annual production capacity of 200,000 units with about 80% of sales from export. Its chain block range includes VD, VT, HSZ and HSC models.

How do JUNYUNHOIST VD and HSZ chain blocks differ?

The VD chain block is a manually operated chain hoist designed for lifting and pulling applications. HSZ is another chain block variant in the JUNYUNHOIST range. Public documentation reviewed for this article includes detailed specifications for the VD model, but not a complete HSZ parameter table; therefore exact differences such as chain falls, load-chain diameter and hook opening should be confirmed with the official HSZ datasheet.

What standards does the JUNYUNHOIST VD chain block meet?

The VD chain block is CE marked and references ISO 16872, EN 13157 and ASME B30.21. It has a chain safety factor of at least 4:1 and a safety factor of at least 5:1 for structural parts. Its hook is made of forged alloy steel and heat-treated, with an opening ranging from 24 to 55 mm, and its standard operating temperature range is -20 C to +50 C with standard grease.

Conclusion: Choose on Data, Not on Labels

When comparing VD and HSZ chain blocks, the only safe method is to compare verified technical data. The VD model is clearly documented as a manual chain hoist for lifting and pulling, with a published load range of 0.5 to 50 tons, standard lift height of 3 meters, one to four chain falls depending on capacity, load chain diameters from 6.3 to 11.2 mm, and hook openings from 24 to 55 mm. HSZ is present in the JUNYUNHOIST product range as a separate orderable variant, but its model-specific parameters are not fully published in the reviewed content. An honest comparison therefore requires the official HSZ datasheet.

Ask for the VD and HSZ specification sheets side by side. Compare load capacity, lift height, chain falls, load chain grade and diameter, hook opening, safety factor and applicable standards. Only then can you decide which model better suits the capacity and lift height requirements of your project.