Snatch Blocks
Pulley Block Double With Hook Open Type
A double pulley block with open type design and hooks on both ends, used to redirect force or provide mechanical advantage in lifting. It features two pulleys mounted on a common shaft, with a hook at each end for attachment. Available in sizes from 3 inch to 12 inch with safe working loads from 0.5T to 6T. The open construction allows for easy inspection and maintenance. Standard materials include drop-forged alloy steel with zinc plating or powder coating. Designed for use in construction, rigging, and industrial
- Size
- 3'' 0.5T 4'' 1T 5'' 1.5T 6'' 2T 7'' 3T 8'' 4T 10'' 5T 12'' 6T
- Catalogue Family
- Snatch 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 Pulley Block Double with Hook Open Type Gives You
- Two pulleys provide mechanical advantage, reducing required lifting force by up to 50 percent compared to a single pulley
- Open type design allows full visual inspection of sheaves, bearings, and rope path for wear or damage
- Hooks on both ends enable secure attachment to lifting points, anchor points, or other rigging components
- Drop-forged alloy steel body resists deformation under repeated dynamic loads
- Zinc plated or powder coated finish resists corrosion in outdoor and marine environments
- Compact size and lightweight design reduce the overall rigging system weight
- No enclosed housing means easier cleaning and maintenance in dusty or dirty conditions
Application Scenarios
Where Pulley Block Double with Hook Open Type Is Used
- Construction site hoisting where a crane or winch needs to redirect a line over a beam or structure
- Industrial rigging setups using a two-line pull to lift heavy machinery with reduced force
- Marine vessel deck operations for adjusting mooring lines or moving cargo with a winch
- Temporary rigging for setting up temporary structures or scaffolding with controlled load distribution
- Maintenance teams using a double block to tension cables or guide heavy components during assembly
Who It Is For
Buyers This Product Is Built For
- Construction contractors specifying lifting hardware for crane and hoist operations
- Industrial maintenance teams managing equipment installation and repair with limited lifting capacity
- Marine and offshore rigging crews handling mooring and cargo transfer on vessels
- Rigging distributors carrying a pulley block range who need a reliable open-type option
- Manufacturers of winch kits and recovery systems requiring compact, multi-functional lifting hardware
Problems It Solves
Problems This Product Removes
- High friction and rope wear caused by a single fixed pulley redirecting a line under load
- Difficulty in inspecting internal components due to enclosed pulley housing
- Need for separate anchor and redirect hardware, increasing part count and setup time
- Corrosion damage to pulley bearings and sheaves in humid or saltwater environments
- Overhead rigging systems where space is limited and a compact multi-pulley solution is needed
- Lack of mechanical advantage in manual lifting tasks requiring more than one person
Technical Features
Technical Features
- Two pulleys mounted on a common shaft with a single load-bearing frame
- Open type construction with no housing, allowing full access to sheaves and bearings
- Hooks on both ends for attachment to anchor points, cables, or other rigging components
- Drop-forged alloy steel body with heat treatment for strength and impact resistance
- Zinc plated or powder coated surface finish for corrosion protection
- Standard 4:1 design factor with minimum breaking load four times the safe working load
- Working load limit and material grade stamped on the frame for traceability
- Sheave diameter sized to match rope diameter for smooth operation and reduced wear
Specifications
Pulley Block Double with Hook Open Type Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Capacity Range | 0.5T to 6T safe working load |
|---|---|
| Size Range | 3 inch to 12 inch overall length |
| Pulley Diameter | 8 mm to 28 mm rope diameter |
| Material | Drop forged alloy steel quenched and tempered |
| Design Factor | 4:1 minimum breaking load to safe working load |
| Surface Finish | Zinc plated or powder coated standard |
| 3 inch Dimensions | Overall length 3 in, hook to hook 3 in, weight 2.1 kg |
| 4 inch Dimensions | Overall length 4 in, hook to hook 4 in, weight 3.8 kg |
| 5 inch Dimensions | Overall length 5 in, hook to hook 5 in, weight 5.6 kg |
| 6 inch Dimensions | Overall length 6 in, hook to hook 6 in, weight 10.5 kg |
| 7 inch Dimensions | Overall length 7 in, hook to hook 7 in, weight 16 kg |
| 8 inch Dimensions | Overall length 8 in, hook to hook 8 in, weight 19.5 kg |
| 10 inch Dimensions | Overall length 10 in, hook to hook 10 in, weight 28 kg |
| 12 inch Dimensions | Overall length 12 in, hook to hook 12 in, weight 36 kg |
Full size table on request. The catalogue publishes a full dimension and capacity table for this item. Ask on WhatsApp or by email and we will send it as a PDF.
Materials
Materials And Finishes
- Drop-forged alloy steel body, quenched and tempered for high tensile strength and fatigue resistance
- Zinc plated surface to resist rust in humid or coastal environments
- Powder coated finish for additional protection and visual identification
- Stainless steel hardware on hooks and pins where applicable for saltwater service
Manufacturing Process
How This Product Is Made
1Drop forging of the pulley block frame and hook blanks
2Quench and temper heat treatment to achieve required hardness and toughness
3Machining of pulley bores, hook openings, and attachment points
4Assembly of pulleys on the shaft with precision bearing fit
5Surface finishing by zinc plating or powder coating
6Stamping of working load limit and material grade on the frame
7Proof load testing and dimensional verification before packing
Quality Control
Quality Control On Every Batch
- Proof load test on production batches before release
- Dimensional tolerance check against published size table
- Breaking strength validation to confirm 4:1 design factor
- Free rotation check of both pulleys under load
- Material Test Certificate to EN 10204 3.1 issued with the order on request
- Third-party inspection accepted at the Qingdao warehouse before shipment
Customisation
Customisation Options
- Custom tonnage stamping on the frame for traceability
- Private label and OEM marking available for brand-specific packaging
- Custom surface finish including zinc plating, powder coating, or electrophoretic black
- Custom hook size or configuration built to a supplied drawing
- Packing carton and pallet configuration tailored to warehouse or retail requirements
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 |
|---|---|
| Enclosed pulley block | The open type allows easier inspection and maintenance but offers less protection from debris and impact |
| Single pulley block | The double pulley provides mechanical advantage and load distribution but is heavier and bulkier |
| Snatch block with swivel | The double block has fixed orientation and no swivel, so it cannot rotate freely but is more stable under side loads |
| Rigid shackle with separate pulley | The integrated double block reduces part count and setup time but cannot be reconfigured as easily |
Use Guide
How To Use And Inspect Pulley Block Double with Hook Open Type
- Match the stamped working load limit to the actual line load, not the winch rating
- Ensure the rope runs smoothly in the sheave groove and does not rub on the frame
- Inspect the sheaves and bearings before each use for signs of wear, binding, or corrosion
- Do not exceed the maximum rope diameter specified for the pulley size
- Avoid side loading the block; keep the pull aligned with the centerline of the frame
- Retire the block if the frame shows deformation, the sheaves seize, or the marking is unreadable
Related Products
Often Ordered With This Item
Trawl Block With Eye Single Wheel
Mounting Block With Hook, Single HQGK
Mounting Block With Eye, Single With A Hinged Lid
Snatch Block with Shackle HDG/ RED Lifting Marine Pulleys
Heavy Duty Snatch Block With Shackle HDG/ RED Lifting Marine Pulleys
Snatch Block With Hook Single Oval Eye Marine Pulleys
Single Sheave Pulley Block With Swivel Oval Eye
Pulley Block Double With Oval Eye B Type
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Answers
Pulley Block Double with Hook Open Type FAQ
What is the mechanical advantage of a double pulley block?
It provides a 2:1 mechanical advantage, meaning the lifting force required is half the load weight when used correctly.
Can this pulley block be used with synthetic rope?
Yes. The sheave diameter and groove profile are sized to match rope diameter, reducing wear on Dyneema and UHMWPE lines.
What safety factor do these pulley blocks have?
A standard 4:1 design factor, so the minimum breaking load is four times the stated safe working load.
Are Material Test Certificates available?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied on request with every order.
Can you customise the hook size or finish?
Yes. Custom hook configurations, tonnage stamping, and surface finishes like zinc plating, powder coating, or electrophoretic black are available.
How are they packed for export?
Standard cartons on pallets. We can configure carton count and pallet pattern to match your warehouse or retail pack. Free two-month storage in Qingdao is available for shipment consolidation.
What sizes and capacities are available?
Available from 3 inch (0.5T) to 12 inch (6T), with sizes and capacities listed in the specs table. The full range includes 0.5T, 1T, 1.5T, 2T, 3T, 4T, 5T, and 6T options.
Need A Quote On Pulley Block Double with Hook Open Type
Send the sizes, the finish and the quantity on WhatsApp or by email. You get a priced reply within 24 hours and a straight answer on stock.
We reply within 24 hours on WhatsApp or by email. Send a drawing, a photo or a bill of materials and we will quote it as it stands.