Mining Chains
Twin Outboard Chain Shackle, Round Link Single Bolt Shackle
A round link single bolt shackle designed for twin outboard chain systems in mining and heavy material handling. It connects two parallel chains on the outer edges of a load, ensuring balanced lifting and stable transfer. Built to DIN 22253 and MT/T71-1997 standards, it uses high-alloy steel with Cr, Ni, Mo for fatigue resistance and sprocket compatibility. Available in sizes from ф10x40 to ф30x108 with B and C grade strength levels and test loads at 2:1 ratio.
- Material
- High quality alloy steel Manufacturing standards: ISO, DIN, BS, MT, etc. Strength level: C level, B level Test
- Catalogue Family
- Mining Chains
- 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 Twin Outboard Chain Shackle Gives You
- Connects two parallel chains on the outer edges of a load for balanced lifting in mining and conveyor systems
- Round link design with single bolt pin allows for easy field assembly and inspection
- High-alloy steel with Cr, Ni, Mo content improves fatigue life and wear resistance in harsh mining environments
- Complies with DIN 22253 and MT/T71-1997 for compatibility with double scraper conveyors and transfer machines
- Test load at 2:1 ratio ensures safety margin under dynamic and repetitive loading
- Bolt pin with nut allows for secure tightening and vibration resistance during operation
- Padless connector design reduces weight and simplifies integration into chain systems
Application Scenarios
Where Twin Outboard Chain Shackle Is Used
- Connecting twin outboard chains on coal mine scraper conveyors where load balance and chain alignment are critical
- Linking transfer machines in underground mining with high-strength circular chains under continuous operation
- Integrating into mine cart systems where chains run parallel and must remain stable during haulage
- Supporting heavy-duty material handling in mining and bulk transport where chain fatigue is a concern
- Replacing worn or damaged connectors in existing twin chain systems without redesigning the entire setup
- Field maintenance and repair of conveyor systems where quick, reliable shackle replacement is needed
Who It Is For
Buyers This Product Is Built For
- Mining equipment manufacturers building scraper conveyors and transfer machines
- Underground coal mine operators maintaining chain systems for continuous haulage
- Rigging and material handling suppliers sourcing connectors for mining applications
- Maintenance teams in mining and bulk handling facilities replacing worn chain links
- Industrial contractors specifying connectors for high-stress chain systems in harsh environments
Problems It Solves
Problems This Product Removes
- Uneven load distribution when using single chain connections in twin outboard systems
- Chain misalignment and wear due to poor connector design in high-vibration mining environments
- Frequent connector failure from fatigue in continuous-duty conveyor systems
- Lack of standardization in chain connectors leading to compatibility issues between components
- Difficulty in field assembly and inspection due to complex or non-standard shackle designs
- Need for a padless connector that reduces weight and simplifies integration into existing chain lines
Technical Features
Technical Features
- Round link single bolt shackle with open link for double-sided chain connection
- High-alloy steel body with Cr, Ni, Mo for enhanced mechanical properties and fatigue life
- Single bolt pin with nut for secure fastening and field accessibility
- Test load at 2:1 ratio with minimum breaking load validated on production batches
- Complies with DIN 22253 and MT/T71-1997 for use in coal mine conveyor systems
- Bolt pin and body dimensions meet tolerance limits specified in the source table
- Stamped working load limit and grade level (B or C) on the body for traceability
Specifications
Twin Outboard Chain Shackle Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Size | ф10×40 to ф30×108 mm |
|---|---|
| Material | High quality alloy steel with Cr, Ni, Mo |
| Grade Level | B level and C level |
| Test Load Ratio | 2:1 |
| Design Standard | DIN 22253, MT/T71-1997 |
| Bolt Pin Type | Single bolt with nut |
| Working Load Limit | Stated on body for each size |
| Minimum Breaking Load | Validated on production batches |
| Dimensional Tolerance | b ±0.5 mm, p ±0.3 mm to ±1 mm depending on size |
| Certificates | Material Test Certificate to EN 10204 3.1 supplied with orders |
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
- High-alloy steel with Cr, Ni, Mo for improved strength and fatigue resistance
- Heat-treated steel body to enhance hardness and durability under dynamic loading
- Bolt pin made from same alloy steel to match body strength and prevent mismatched failure
- Surface finish selected for corrosion resistance in mining and humid environments
Manufacturing Process
How This Product Is Made
1Forging of round link and bolt pin blanks from high-alloy steel
2Multiple heat treatment processes to achieve required mechanical properties
3Machining of bolt threads and link bore to tolerance limits
4Assembly of bolt pin with nut and final torque check
5Proof load testing on production batches
6Dimensional and visual inspection before marking
7Stamping of working load limit and grade level on the body
8Packing and preparation for export
Quality Control
Quality Control On Every Batch
- Proof load test on each production batch with documented results
- Dimensional tolerance check against published size table
- Breaking strength validation to confirm 2:1 test load ratio
- Visual and surface inspection for cracks, burrs, or defects
- Material Test Certificate to EN 10204 3.1 issued with every order
- Third-party inspection accepted at the Qingdao warehouse before shipment
Documentation
Certification And Documentation Supplied
- Material Test Certificate to EN 10204 3.1 supplied with orders
- Working load limit and grade level stamped on the body for traceability
Customisation
Customisation Options
- Custom tonnage stamping on the body for specific project requirements
- Private label and OEM marking available for brand integration
- Custom surface finish including zinc plating, powder coating, or electrophoretic black
- Sizes and dimensions built to a supplied drawing upon request
- Packing configuration adjusted for carton count, pallet pattern, or warehouse handling
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 |
|---|---|
| Pad-mounted chain connector | The padless design reduces weight and simplifies chain alignment, but a pad-mounted version may offer better load distribution in high-impact applications |
| Double bolt shackle | Single bolt is lighter and faster to install, but a double bolt version offers higher resistance to bolt loosening under extreme vibration |
| Welded chain link | The shackle allows for disassembly and inspection, while a welded link is permanent and cannot be replaced without cutting the chain |
| Standard round link shackle | The twin outboard configuration is specifically designed for parallel chain systems, whereas a standard shackle is not optimized for dual chain alignment |
Use Guide
How To Use And Inspect Twin Outboard Chain Shackle
- Ensure the bolt pin is fully tightened with the nut and cotter pin before loading
- Inspect the shackle for deformation, wear, or thread damage before each use
- Match the stamped working load limit to the actual chain load, not the equipment rating
- Avoid side loading the shackle; keep the pull aligned with the bolt axis
- Check that both chains are properly seated in the outer links and not twisted
- Retire the shackle if the body shows cracks, the bolt seizes, or the marking is illegible
Related Products
Often Ordered With This Item
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Mining Chain Connectors Flat Sawtooth Chainlock
Mining Chain Connector With Flat Arc Tooth CC Series Chainlock
Round Link Double Bolt Shackle
Coal Mine Car Three Ring Chain For Narrow Gauge Railway Vehicles
Mining Compact Chain High Strength Mining Flat Chains
High Tension Round Link Chain For Mining
High Tension Round Link Mining Chain
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Answers
Twin Outboard Chain Shackle FAQ
What is the test load ratio for this shackle?
The test load is at 2:1 ratio, meaning the minimum breaking load is twice the stated safe working load. This is validated on production batches with documented proof load testing.
Is this shackle suitable for coal mine scraper conveyors?
Yes. It complies with DIN 22253 and MT/T71-1997, making it suitable for connecting double scraper conveyors and transfer machines in coal mines.
Can I get a Material Test Certificate with my order?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied with every order, confirming the material composition and mechanical properties of the steel used.
What grades are available for this shackle?
Available in B level and C level strength grades. The minimum breaking load and test load are specified for each grade and size in the product table.
Can I have custom tonnage stamped on the shackle?
Yes. Custom tonnage stamping is available on request. We also offer private label and OEM marking for brand integration.
How are the shackles packed for export?
Standard packing is cartons on pallets. We can configure the carton count and pallet pattern to suit your warehouse or logistics needs. Free storage in Qingdao for two months is available to consolidate shipments.
What sizes are in stock?
Sizes range from ф10×40 to ф30×108 mm. The full size table with b, p, test load, and MBS values is available in the product data. Stock availability varies by size and grade.
Need A Quote On Twin Outboard Chain Shackle
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.