Shackles
Screw Pin Shackle Large Bow Shackle with Collar Pin
A large bow shackle with a screw pin design, drop forged in carbon steel or stainless steel, featuring an electric galvanized finish and a 3:1 safety factor. Available in sizes M5 to M50, it provides a secure, adjustable connection point for lifting, rigging, towing, and general industrial use. The threaded pin allows for quick assembly and disassembly in the field.
- Size
- M5-M50 Package: Carton/Gunny bag/Pallet / As customer's requirements
- Material
- Carbon Steel or Stainless Steel Process: Free Forging Surface: Electric galvanized
- Catalogue Family
- Shackles
- 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 Screw Pin Shackle Gives You
- Screw pin design enables fast and secure connection without requiring a separate pin tool
- Drop forged carbon steel or stainless steel body ensures strength and resistance to impact
- Electric galvanized surface finish resists corrosion in humid, wet, or marine environments
- 3:1 safety factor ensures reliable performance under rated load conditions
- Available in sizes from M5 to M50 to suit a wide range of load capacities and applications
- U-shaped bow design provides a strong, stable load path with even stress distribution
- Threaded pin can be tightened manually with a wrench or spanner, ideal for field use
Application Scenarios
Where Screw Pin Shackle Is Used
- Marine and offshore rigging where corrosion resistance and easy assembly are critical
- Construction site lifting operations involving temporary rigging setups with frequent reconfiguration
- Towing and recovery operations where quick connection and disconnection of chains or cables are needed
- Industrial maintenance where shackles are used in temporary hoisting or equipment anchoring
- Mining and quarrying applications with exposure to dust, moisture, and vibration
- Logistics and transport where shackles secure cargo on trailers or containers during transit
- General purpose industrial use in factories and warehouses for rigging and equipment handling
Who It Is For
Buyers This Product Is Built For
- Marine equipment suppliers specifying corrosion-resistant rigging for offshore or coastal use
- Construction contractors needing reliable, field-assembly shackles for temporary lifting
- Towing and recovery service providers building winch and cable kits for trucks and trailers
- Industrial maintenance teams managing equipment hoisting and rigging in harsh environments
- Logistics companies sourcing durable shackles for cargo securing and transport
- Rigging distributors expanding their shackle range with a versatile screw pin option
- Manufacturers requiring custom-sized shackles for internal equipment or assembly lines
Problems It Solves
Problems This Product Removes
- Need for a secure, reusable connection point that can be assembled and disassembled without tools
- Corrosion damage in humid or marine environments due to inadequate surface protection
- Risk of pin loosening under vibration or dynamic load due to lack of locking mechanism
- Inconsistent safety margins when using non-rated or unmarked shackles
- Limited availability of screw pin shackles in larger sizes beyond standard M20
- Multiple suppliers needed for different shackle types when a single solution is preferred
- Difficulty in field maintenance due to lack of clear marking or traceability
Technical Features
Technical Features
- Drop forged carbon steel or stainless steel body for high strength and impact resistance
- Threaded screw pin with hex head for manual tightening and release
- Electric galvanized surface finish for corrosion protection in wet or aggressive environments
- 3:1 safety factor applied to all sizes, with minimum breaking load three times the safe working load
- Clear S.W.L. and size markings stamped on the body for traceability and compliance
- U-shaped bow design with smooth internal radii to reduce stress concentration
- Threaded pin engages fully with the body to prevent accidental disengagement under load
Specifications
Screw Pin Shackle Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Capacity Range | 80 kg to 8000 kg safe working load |
|---|---|
| Material | Carbon steel or stainless steel |
| Process | Drop forging |
| Surface Finish | Electric galvanized |
| Safety Factor | 3:1 minimum breaking load to safe working load |
| Size Range | M5 to M50 |
| Weight per 100 pcs | 2.2 kg to 2,012 kg depending on size |
| Dimensions | d (pin diameter) to D (body width) and a (height) as per table |
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 carbon steel body for high tensile strength and durability
- Stainless steel option available for use in corrosive or high-salt environments
- Electric galvanized coating applied to the forged body to resist rust and oxidation
- Threaded screw pin made from hardened steel to withstand repeated tightening and loosening
- Hex head on the pin for manual operation with wrench or spanner
Manufacturing Process
How This Product Is Made
1Raw steel billets are drop forged into the bow and pin shapes
2Heat treatment applied to improve strength and toughness
3Machining of threads on the pin and bore in the body
4Surface treatment via electric galvanizing for corrosion resistance
5Final inspection of dimensions and thread engagement
6Stamping of S.W.L. and size markings on the body
7Packing according to customer requirements or standard carton/pallet configuration
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 3:1 safety factor
- Thread engagement and pin fit check during assembly
- 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 body for specific load ratings
- Private label and OEM marking available for brand-specific packaging
- Surface finish options including electric galvanizing, zinc plating, or powder coating
- Custom sizes and dimensions built to a supplied drawing
- Packing configuration tailored to customer warehouse or retail pack 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 |
|---|---|
| Screw pin shackle with cotter pin | The standard screw pin design is easier to assemble in the field but lacks a secondary locking mechanism; a cotter pin adds security but requires extra parts and installation time |
| Bolt pin shackle | The screw pin allows for faster adjustment without tools, but the bolt pin with nut and cotter is more resistant to vibration and accidental loosening |
| Rigid shackle | The screw pin enables quick connection and disconnection, but a rigid shackle has no moving parts and is simpler to inspect and maintain |
| Welded shackle | Drop forged construction offers better impact resistance and fatigue life than a welded shackle, which may have stress concentrations at the weld joint |
Use Guide
How To Use And Inspect Screw Pin Shackle
- Verify the stamped safe working load matches the calculated load before use
- Ensure the screw pin is fully tightened with a wrench before applying any load
- Inspect the shackle for deformation, thread wear, or corrosion before each use
- Do not use if the pin cannot be fully engaged or if the threads are damaged
- Avoid side loading or bending the pin, which reduces strength and causes premature failure
- Retire the shackle if the body shows visible deformation or the marking is illegible
- Store in a dry area to prevent corrosion, especially if not in use for extended periods
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Answers
Screw Pin Shackle FAQ
What is the safety factor on these screw pin shackles?
A standard 3:1 safety factor is applied, meaning the minimum breaking load is three times the stated safe working load.
Can I get a Material Test Certificate with my order?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied on request with every order.
What materials are available for the shackle body?
Available in carbon steel or stainless steel, depending on the application and environmental conditions.
Is electric galvanizing the only surface finish?
No. Custom finishes such as zinc plating, powder coating, or electrophoretic black are available upon request.
Can I order custom sizes or drawings?
Yes. Custom sizes, dimensions, and assemblies can be built to a supplied drawing or specification.
How are the shackles packed for export?
Standard packing is in cartons, gunny bags, or on pallets. We can configure carton count and pallet pattern to suit your warehouse or retail pack.
What is the size range available?
Sizes range from M5 to M50, with safe working loads from 80 kg to 8000 kg, as listed in the size table.
Need A Quote On Screw Pin 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.