Snatch Blocks
Single Sheave Pulley Block With Swivel Oval Eye
A single sheave pulley block with swivel oval eye, designed to redirect force and reduce effort in lifting or moving loads. It features a rotating swivel eye for alignment flexibility and a grooved sheave to guide rope or cable. Available in 5'' 3T and 6'' 5T sizes, it supports applications requiring directional change without mechanical advantage. The frame is forged steel with a smooth sheave bore and secure pin retention.
- Size
- 5'' 3T 6'' 5T
- 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 Single Sheave Pulley Block Gives You
- Swivel oval eye allows alignment with dynamic load angles, reducing side loading and rope wear
- Single sheave design redirects force efficiently with minimal friction on rope or cable
- Drop-forged steel frame provides high strength and impact resistance for repeated lifting
- Smooth sheave groove reduces rope chafing and extends service life of synthetic and wire rope
- Compact size and lightweight construction make it easy to carry and install in tight spaces
- No mechanical advantage but reduces effort by distributing load across the rope path
- Standard 4:1 design factor ensures safe working load is maintained under normal use
Application Scenarios
Where Single Sheave Pulley Block Is Used
- Marine rigging on boats and yachts for sail hoisting and line tensioning with changing angles
- Construction site lifting where a line needs redirection around beams or structural members
- Industrial maintenance setups using a fixed anchor point and a moving load with variable pull direction
- Truck-mounted winching operations where the pulley redirects the line around a frame or bumper
- Temporary rigging for crane setup or equipment positioning where a simple redirect is needed
- Cable tensioning in overhead systems where the load direction changes during operation
Who It Is For
Buyers This Product Is Built For
- Marine equipment suppliers specifying pulley blocks for boat rigging and anchor systems
- Construction contractors needing compact redirect points for hoisting materials
- Industrial maintenance teams setting up temporary lifting points on machinery
- Rigging distributors carrying a pulley range who require a reliable single-block option
- Fleet operators using winch systems on trailers and recovery vehicles
Problems It Solves
Problems This Product Removes
- Rope or cable damage from sharp bends and side loading at fixed redirect points
- Difficulty aligning a fixed pulley with a moving load or changing pull direction
- Need for a compact, lightweight redirect fitting that doesn’t add bulk to a rigging setup
- Lack of swivel capability in rigid pulley blocks causing rope twist and fatigue
- Buying a redirect block and a separate swivel hook from two different suppliers
- Inconsistent load distribution due to misalignment between anchor and pull point
Technical Features
Technical Features
- Single sheave with grooved wheel for rope or cable guidance
- Swivel oval eye for dynamic alignment under load
- Drop-forged steel frame with heat-treated strength
- Sheave bore machined to precise tolerance for smooth rotation
- Pin and cotter system to secure the sheave in place
- Standard 4:1 design factor with minimum breaking load four times the safe working load
- Working load limit and traceability marking stamped on the frame
- Available in 5'' 3T and 6'' 5T sizes with specified rope diameter range
Specifications
Single Sheave Pulley Block Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Capacity Range | 3T to 5T safe working load |
|---|---|
| Sheave Diameter | 5'' for 3T, 6'' for 5T |
| Rope Diameter Range | 18–20 mm for 3T, 20–22 mm for 5T |
| Net Weight | 6.75 kg for 3T, 11 kg for 5T |
| Frame Material | Drop forged steel |
| Pin Type | Through pin with cotter pin |
| Surface Finish | Zinc plated or custom |
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 steel frame for high tensile strength and fatigue resistance
- Heat-treated sheave bore for wear resistance and smooth rotation
- Zinc plated finish to resist corrosion in marine and outdoor environments
- Stainless steel cotter pin to prevent seizing in salt or humid conditions
- Custom surface finishes available including powder coating and electrophoretic black
Manufacturing Process
How This Product Is Made
1Drop forging of the frame and sheave blanks
2Heat treatment of the forged steel for quenching and tempering
3Machining of the sheave bore and swivel eye hole
4Assembly of the sheave on the pin with cotter pin retention
5Surface finishing by zinc plating or powder coating as ordered
6Stamping of working load limit and traceability marking
7Proof load testing and final inspection 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 on the sheave with no binding or grit
- 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
- Private label and OEM marking for brand-specific packaging
- Finish options: zinc plating, powder coating, or electrophoretic black
- Custom sizes and assembly built to a supplied drawing
- Packing configuration adjusted for carton count and pallet pattern
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 |
|---|---|
| Fixed eye pulley block | The swivel oval eye allows dynamic alignment, reducing rope twist and side loading, but adds a moving part that requires inspection |
| Double sheave pulley block | The single sheave provides no mechanical advantage but is lighter and more compact for simple redirection tasks |
| Snatch block with shackle | The oval eye offers a direct attachment point without a separate shackle, reducing parts and weight |
| Rigid pulley with fixed eye | The swivel prevents misalignment under load and reduces rope wear, but may require more frequent inspection of the swivel mechanism |
Use Guide
How To Use And Inspect Single Sheave Pulley Block
- Match the stamped working load limit to the calculated line load, not the winch rating
- Ensure the rope runs in the sheave groove and not on the frame edges
- Check the swivel rotates freely and the cotter pin is properly installed before use
- Avoid side loading the pulley by keeping the pull aligned with the sheave axis
- Inspect the sheave for wear, the pin for looseness, and the finish for damage before each use
- Retire the block if the frame shows deformation, the sheave seizes, or the marking is illegible
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
Pulley Block Double With Oval Eye B Type
Snatch Pulley Block Triple With Hook B Type
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Answers
Single Sheave Pulley Block FAQ
What is the difference between this pulley and a fixed eye pulley?
The swivel oval eye allows the pulley to rotate and align with changing load angles, reducing rope twist and side loading compared to a fixed eye.
Does this pulley provide mechanical advantage?
No. A single sheave pulley block does not provide mechanical advantage; it only redirects force. Mechanical advantage requires multiple sheaves.
What rope diameters are compatible?
The 3T size fits 18–20 mm rope, and the 5T size fits 20–22 mm rope. Use the correct size to avoid excessive wear or slippage.
Can you supply a Material Test Certificate?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied with the order on request, and every batch is proof load tested.
Is custom tonnage stamping available?
Yes. Custom tonnage stamping, private label marking, and OEM packing are standard options for this pulley block.
How are the pulleys packed for export?
Standard cartons on pallets. We can configure carton count and pallet pattern to match your warehouse or retail pack requirements.
What sizes are available?
Available in 5'' 3T and 6'' 5T sizes. The net weight is 6.75 kg and 11 kg respectively, with rope diameter ranges of 18–20 mm and 20–22 mm.
Need A Quote On Single Sheave Pulley Block
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.