Snatch Blocks
Pulley Block Double With Oval Eye B Type
A double pulley block with oval eye attachment in closed B type design, engineered for directional force change and mechanical advantage in lifting operations. Features two pulleys mounted in a single housing with oval eyes on both ends for secure rigging attachment. Available in sizes from 3 inch to 10 inch with safe working loads from 0.5T to 5T, suitable for construction, rigging, and industrial lifting tasks where compact, reliable load redirection is required.
- Size
- 3'' 0.5T 4'' 1T 5'' 1.5T 6'' 2T 7'' 3T 8'' 4T 10'' 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 Pulley Block Double with Oval Eye B Type Gives You
- Two pulleys in one unit provide mechanical advantage, reducing the effort needed to lift heavy loads
- Oval eyes on both ends allow secure attachment to hooks, beams, or other rigging points
- Closed B type housing protects the pulley bearings and rope from debris and impact
- Compact design reduces space needed on a rigging setup compared to multiple single pulleys
- Smooth rotating pulleys minimize rope wear and friction during repeated lifts
- Standard 4:1 design factor ensures safe operation under rated load
- Robust construction handles dynamic loads and side loading in field conditions
Application Scenarios
Where Pulley Block Double with Oval Eye B Type Is Used
- Construction site hoisting of steel beams and precast panels using a two-line pull system
- Industrial rigging setups where space is limited and multiple redirection points are needed
- Marine and offshore deck operations for adjusting mooring lines and cargo tension
- Cranes and hoists requiring a compact, high-load capacity pulley block with dual sheaves
- Temporary rigging for equipment installation where quick setup and reliability are critical
- Tensioning of guy wires, cables, and rigging lines in structural and infrastructure projects
- Recovery and towing operations where a mechanical advantage is needed with minimal gear
Who It Is For
Buyers This Product Is Built For
- Rigging contractors sourcing complete pulley block solutions for job sites
- Construction companies specifying lifting hardware for crane and hoist systems
- Marine and offshore service providers needing durable pulley blocks for deck operations
- Industrial maintenance teams managing equipment lifting and alignment tasks
- Logistics and transport firms using pulley blocks in trailer and container handling
- Manufacturers building rigging kits or toolkits for field use
- Engineering firms specifying pulley blocks in load calculation and safety assessments
Problems It Solves
Problems This Product Removes
- Need for multiple single pulleys in a single rigging setup increases complexity and weight
- Open-ended pulley blocks expose bearings to dirt, moisture, and impact damage
- Lack of mechanical advantage in single pulley systems increases manual effort
- Inadequate attachment points on standard pulleys requiring additional shackles or fittings
- Rope wear from sharp edges or misaligned sheaves due to poor pulley design
- Difficulty in securing pulley blocks to fixed points without additional hardware
- Sourcing pulley blocks with consistent load ratings and traceability from a single supplier
Technical Features
Technical Features
- Double pulley configuration with two sheaves in a single housing
- Oval eye attachment on both ends for secure rigging connection
- Closed B type housing to protect internal components and maintain alignment
- Standard 4:1 design factor with minimum breaking load four times the safe working load
- Working load limit and traceability marking stamped on the housing
- Smooth, precision-machined sheave bore for consistent rope rotation
- Robust housing made from drop-forged steel for high impact resistance
- Designed for use with wire rope and synthetic rope up to the specified diameter
Specifications
Pulley Block Double with Oval Eye B Type Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Capacity Range | 0.5T to 5T safe working load |
|---|---|
| Size Range | 3 inch to 10 inch overall length |
| Pulley Diameter | 8 mm to 25 mm rope diameter |
| Design Factor | 4:1 minimum breaking load to safe working load |
| Material | Drop forged steel housing and sheaves |
| Surface Finish | Zinc plated or powder coated on request |
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 for the housing and sheaves to withstand high impact and dynamic loads
- Heat-treated steel components to improve strength and fatigue resistance
- Zinc plating or powder coating applied to the housing for corrosion resistance
- Precision-machined sheave bore to ensure smooth rotation and rope alignment
Manufacturing Process
How This Product Is Made
1Drop forging of the housing and sheave blanks
2Heat treatment to improve strength and durability
3Machining of the sheave bore and eye holes to tolerance
4Assembly of pulleys and bearings in the housing
5Surface finishing by zinc plating or powder coating
6Stamping of working load limit and traceability marks
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
- Rotation check on both pulleys for free movement and no binding
- Material Test Certificate to EN 10204 3.1 issued with the order
- Third-party inspection accepted at warehouse before shipment
Customisation
Customisation Options
- Custom tonnage stamping on the housing
- Private label and OEM marking available
- Surface finish in zinc plating, powder coating, or electrophoretic black
- Custom size and configuration built to a supplied drawing
- Packing carton and pallet configuration tailored to your warehouse or retail needs
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 |
|---|---|
| Single pulley block | The double pulley provides mechanical advantage and reduces effort, but adds weight and complexity |
| Open-faced pulley block | The closed B type offers better protection from debris and impact, but may be harder to inspect internally |
| Hook-end pulley block | Oval eye allows for secure attachment to beams and fixed points, but requires a compatible rigging point |
| Standard open sheave block | The closed housing prevents rope from jumping off during dynamic loads, but limits visual inspection of the sheave |
Use Guide
How To Use And Inspect Pulley Block Double with Oval Eye B Type
- Match the stamped safe working load to the calculated load, not the hoist or winch rating
- Ensure the rope runs smoothly in the groove of both pulleys without side loading
- Inspect the pulley rotation before each use; stop if there is binding or grit
- Do not exceed the maximum rope diameter specified for the pulley size
- Secure the oval eyes to fixed points using appropriate shackles or connectors
- Retire the block if the housing shows deformation, the sheave seizes, or the marking is illegible
- Keep the block clean and dry; reapply protective coating if needed after exposure to salt or moisture
Related Products
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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
Snatch Pulley Block Triple With Hook B Type
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Answers
Pulley Block Double with Oval Eye B Type FAQ
What is the mechanical advantage of a double pulley block?
A double pulley block provides a 2:1 mechanical advantage, meaning half the force is needed to lift the load compared to a single pulley.
Can this pulley block be used with synthetic rope?
Yes, it can be used with synthetic rope up to the specified diameter, but ensure the sheave groove is sized to prevent abrasion and heat buildup.
What safety factor does this pulley block have?
A standard 4:1 design factor, so the minimum breaking load is four times the safe working load.
Are Material Test Certificates available?
Yes, a Material Test Certificate to EN 10204 3.1 is supplied on request with each order.
Can you custom stamp our company name and tonnage?
Yes, custom tonnage stamping, private label marking, and OEM branding are standard options.
How are the pulley blocks packed for export?
Standard carton on pallet packing; we can configure the 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 sizes range from 3 inch to 10 inch with safe working loads from 0.5T to 5T. Full dimensions and weights are listed in the specification table.
Need A Quote On Pulley Block Double with Oval Eye B 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.