Pulley Blocks
Die casting double pulley
A die-cast double pulley block made from zinc alloy with nickel plating, designed for light to medium duty rigging applications. The unit features two sheaves mounted on a single axle, allowing for a mechanical advantage of 2:1 in lifting or pulling systems. It is suitable for use in industrial, marine, and construction environments where compact size and corrosion resistance are required. Available in standard sizes with a 4:1 design factor, the pulley is suitable for synthetic webbing, wire rope, and chain. The b
- Catalogue Family
- Pulley Blocks
- Certificates
- EN 10204 3.1 material test certificate on request
CAD files are supplied on request via WhatsApp or email rather than published for open download.
Key Benefits
What Die Casting Double Pulley Gives You
- Die-cast zinc alloy body provides consistent shape and dimensional stability with minimal machining
- Nickel plating resists corrosion and maintains appearance in humid or marine environments
- Double sheave design enables 2:1 mechanical advantage without adding a second pulley
- Compact size reduces space required in tight rigging setups and on mobile equipment
- Smooth, precision-machined sheave bores reduce friction and extend rope or chain life
- Standard 4:1 design factor ensures safe working load is maintained under rated conditions
- Lightweight construction reduces load on lifting systems and improves handling
Application Scenarios
Where Die Casting Double Pulley Is Used
- Marine deck rigging for small boats and fishing vessels where corrosion resistance and compact size matter
- Industrial maintenance hoisting in factories with limited overhead space
- Temporary rigging setups in construction where quick assembly and light weight are needed
- Warehouse and logistics operations using manual winches or hand-pulls for light loads
- Equipment recovery and towing where a compact double pulley reduces gear bulk
- Rigging systems using synthetic webbing or light wire rope where low friction is critical
Who It Is For
Buyers This Product Is Built For
- Marine equipment suppliers specifying corrosion-resistant pulleys for boat and vessel rigging
- Industrial maintenance teams needing compact, lightweight pulley blocks for overhead lifting
- Construction contractors setting up temporary lifting systems with limited space
- Logistics and warehouse operators using hand-pulls for light material handling
- Rigging distributors carrying a range of pulley blocks who need a compact, corrosion-resistant option
- Equipment manufacturers integrating pulleys into winch kits or recovery systems
Problems It Solves
Problems This Product Removes
- Heavy or bulky pulley blocks taking up space in tight rigging zones
- Rust and surface degradation on steel pulleys in humid or coastal environments
- Need for two separate pulleys to achieve a 2:1 mechanical advantage, increasing cost and complexity
- Inconsistent dimensions from cast or machined parts leading to misalignment and wear
- Lack of corrosion resistance in standard zinc die-cast parts used outdoors
- Buying pulley blocks from multiple suppliers when a single compact double unit would suffice
Technical Features
Technical Features
- Die-cast zinc alloy body with nickel plating for corrosion resistance
- Two sheaves mounted on a single axle with precision-machined bores
- Standard 4:1 design factor with minimum breaking load four times the safe working load
- Smooth, hardened sheave surfaces to reduce rope or chain wear
- Working load limit stamped on the body for traceability
- Lightweight construction suitable for hand-pulls and manual winches
- Available in standard sizes with consistent dimensions across the range
Specifications
Die Casting Double Pulley Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Material | Zinc alloy die-cast with nickel plating |
|---|---|
| Surface Finish | Nickel plated |
Materials
Materials And Finishes
- Zinc alloy die-cast body for consistent shape and strength
- Nickel plating over the die-cast surface for corrosion resistance
- Precision-machined sheave bores for smooth rotation
- Hardened sheave surfaces to reduce wear on rope and chain
Manufacturing Process
How This Product Is Made
1Die-casting of the pulley body in zinc alloy under high pressure
2Post-casting machining of sheave bores and mounting holes
3Nickel plating process for surface protection and appearance
4Assembly of sheaves and axle with precision fit
5Proof load testing on production batches
6Stamping of working load limit and traceability marks
7Final inspection and packing
Quality Control
Quality Control On Every Batch
- Proof load testing on production batches before release
- Dimensional tolerance check against published size table
- Breaking strength validation to confirm 4:1 design factor
- Sheave rotation check for free movement and no binding
- Material Test Certificate to EN 10204 3.1 issued with the order on request
- Third-party inspection accepted at warehouse before shipment
Customisation
Customisation Options
- Custom tonnage stamping on the body
- Private label and OEM marking available
- Custom surface finish including zinc plating, powder coating, or electrophoretic black
- Custom sizes and sheave configurations built to a drawing
- Custom carton and pallet packing for warehouse or retail use
Compare
How It Compares With The Alternatives
An honest read on where this pattern wins and where another one would serve you better.
| Alternative | Honest Trade Off |
|---|---|
| Steel double pulley | Lighter and more corrosion-resistant but lower strength and not suitable for heavy-duty or high-impact applications |
| Single sheave pulley | Provides mechanical advantage of 2:1 but requires two separate units to achieve the same effect |
| Cast iron pulley | Heavier and more prone to rust; die-cast zinc offers better dimensional consistency and surface finish |
| Plastic pulley | Lighter and cheaper but lacks strength and heat resistance under load; zinc alloy holds up better in repeated use |
Use Guide
How To Use And Inspect Die Casting Double Pulley
- Verify the stamped working load limit matches the calculated load, not the winch rating
- Ensure the rope or chain runs smoothly in the sheave groove and does not rub on the body
- Check that both sheaves rotate freely and show no binding before use
- Avoid side loading the pulley; keep the pull aligned with the axle axis
- Inspect the nickel plating for wear or damage before each use, especially in corrosive environments
- Retire the pulley if the body shows deformation, the sheave seizes, or the marking is no longer legible
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Answers
Die Casting Double Pulley FAQ
What is the design factor for this pulley?
A standard 4:1 design factor, so the minimum breaking load is four times the safe working load.
Is the nickel plating durable in marine environments?
Yes. The nickel plating provides corrosion resistance suitable for indoor and outdoor use, including marine and coastal applications.
Can you supply a Material Test Certificate?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied with the order on request.
What sizes are available?
Available in standard sizes with consistent dimensions. The size table includes d, D, H, and weight for each capacity.
Can you custom stamp our brand and tonnage?
Yes. Custom tonnage stamping, private label marking, and OEM packing are standard options.
How are they packed for export?
Cartons on pallets as standard. We can configure carton count and pallet pattern to suit your warehouse or retail pack. Goods can be held in our Qingdao warehouse free for two months.
Is this pulley suitable for synthetic rope?
Yes. The smooth, precision-machined sheave grooves reduce friction and prevent abrasion on synthetic webbing and rope.
Need A Quote On Die Casting Double Pulley
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