Shackles
Twisted Shackle Stainless Steel
A forged stainless steel shackle with a 90-degree twist in the body, designed to reduce torque and twisting forces when attaching lines to fixed points. Used in rigging, lifting, and tension applications where a standard shackle would induce rotational stress. Available in sizes from 4mm to 12mm, made from Type 316 stainless steel, with a 4:1 design factor and screw pin for secure fastening.
- Size
- From 4mm to 12mm. Ultimate Load is 4 times Working Load Limit
- Material
- Stainless steel 304/316 Processing: Forged
- Finish
- Self-colored
- Packing
- Cartons + Pallets
- 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 Twisted Shackle Stainless Steel Gives You
- The 90-degree twist in the body reduces torque on the attachment point, preventing line twist and sail distortion
- Type 316 stainless steel provides high resistance to corrosion in marine, outdoor and humid environments
- Screw pin with lock nut allows secure fastening and prevents accidental loosening under dynamic loads
- 4:1 design factor ensures minimum breaking load is four times the safe working load
- Self-colored finish maintains appearance and resists surface degradation without additional coating
- Compact design fits in tight spaces where a straight shackle would interfere with adjacent components
- Reduces wear on synthetic lines and fittings by eliminating rotational stress at the anchor point
Application Scenarios
Where Twisted Shackle Stainless Steel Is Used
- Attaching jib halyard blocks to masts on sailboats where line twist must be minimized for sail performance
- Securing shade sails to mounting points where a standard shackle would cause twisting and uneven tension
- Marine rigging on docks and offshore platforms where corrosion resistance and torque reduction are critical
- Outdoor tension systems such as canopy supports, awnings, and temporary structures exposed to weather
- Construction site rigging where space is limited and rotational forces must be controlled
- Off-road recovery setups using tow straps or cables where line alignment and stability matter
Who It Is For
Buyers This Product Is Built For
- Marine equipment suppliers building rigging kits for sailboats and yachts
- Shade sail manufacturers specifying hardware that prevents sail twist and maintains tension
- Outdoor structure fabricators installing tensioned canopies and shade systems
- Construction rigging teams working in confined or high-corrosion environments
- Industrial contractors needing corrosion-resistant hardware for outdoor lifting and anchoring
- Rigging distributors carrying a stainless steel shackle range with specialized geometry
Problems It Solves
Problems This Product Removes
- Sail distortion and luff twist caused by torque from a straight shackle during hoisting
- Uneven tension and premature wear on shade sail fabric due to rotational stress at the anchor point
- Corrosion damage to rigging hardware in saltwater or coastal environments
- Line chafing and sheath damage from twisting forces when using standard shackles
- Inadequate clearance in tight spaces where a straight shackle cannot be installed
- Need for two separate fittings to manage both attachment and torque control
Technical Features
Technical Features
- 90-degree twist in the shackle body to reduce torque on the attachment point
- Forged Type 316 stainless steel construction for strength and corrosion resistance
- Screw pin with lock nut for secure fastening and vibration resistance
- 4:1 design factor with minimum breaking load four times the safe working load
- Self-colored finish on the forged body, no coating applied
- Working load limit stamped on the shackle body for traceability
- Standard dimensions include size A, B, L, WLL in mm and lbs for each capacity
Specifications
Twisted Shackle Stainless Steel Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Capacity Range | 4mm to 12mm safe working load |
|---|---|
| Material | Type 316 stainless steel |
| Design Factor | 4:1 minimum breaking load to safe working load |
| Pin Type | Screw pin with lock nut |
| Surface Finish | Self-colored (no coating) |
| 4mm Dimensions | A 5/32” B 4 L 8 WLL 167 kg / 365 lbs |
| 5mm Dimensions | A 3/16” B 5 L 10 WLL 275 kg / 605 lbs |
| 6mm Dimensions | A 1/4” B 6 L 12 WLL 400 kg / 880 lbs |
| 8mm Dimensions | A 5/16” B 8 L 16 WLL 700 kg / 1540 lbs |
| 10mm Dimensions | A 3/8” B 10 L 20 WLL 1150 kg / 2530 lbs |
| 12mm Dimensions | A 1/2” B 12 L 24 WLL 1500 kg / 3300 lbs |
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
- Type 316 stainless steel forged into the shackle body for high strength and corrosion resistance
- Screw pin made from the same stainless steel grade for matching durability and corrosion performance
- Self-colored finish applied after forging, no additional coating or plating
- No zinc plating or powder coating used; surface remains in the natural forged state
Manufacturing Process
How This Product Is Made
1Forging of the shackle body and screw pin blanks from Type 316 stainless steel
2Heat treatment to enhance mechanical properties and stress relief
3Machining of the screw pin thread and body bore for precise fit
4Assembly of the screw pin with lock nut and final tightening
5Surface inspection and cleaning to remove forging residue
6Working load limit stamping and marking on the body
7Proof load testing and packing for export
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
- Visual inspection for surface defects, cracks, or deformation
- Material Test Certificate to EN 10204 3.1 issued on request
- Third-party inspection accepted at warehouse before shipment
Customisation
Customisation Options
- Custom tonnage stamping on the shackle body
- Private label and OEM marking available
- Custom sizes and assemblies built to a supplied drawing
- Packing configuration adjusted for carton count and pallet pattern
- Finish can be specified as self-colored only (no coating)
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 |
|---|---|
| Standard straight shackle | The twisted version reduces torque and line twist but has a more complex geometry and is not interchangeable |
| Screw pin shackle with straight body | The twist prevents rotational stress on the anchor point, but the straight version is simpler and more common for general use |
| Alloy steel shackle | Stainless steel offers superior corrosion resistance but is less impact-resistant and more expensive |
| Galvanized steel shackle | Galvanized offers lower cost and moderate corrosion protection, but stainless steel lasts longer in marine and outdoor environments |
Use Guide
How To Use And Inspect Twisted Shackle Stainless Steel
- Inspect the shackle before each use for deformation, cracks, or wear on the body and pin
- Ensure the load does not exceed the stamped safe working load
- Tighten the screw pin with a wrench and secure with the lock nut before use
- Check that the twist angle remains intact and the body is not bent
- Avoid side loading or bending the shackle beyond its designed axis
- Retire the shackle if the marking is illegible, the body shows deformation, or the pin will not hold
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Kenter Shackle - Anchor Chain Fittings
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Answers
Twisted Shackle Stainless Steel FAQ
What is the purpose of the 90-degree twist in the shackle?
The twist reduces torque on the attachment point, preventing line twist and sail distortion in applications like sailboat rigging and shade sail installation.
Is this shackle suitable for marine environments?
Yes. Made from Type 316 stainless steel, it resists corrosion in saltwater and coastal conditions.
What is the design factor for these shackles?
A standard 4:1 design factor, meaning the minimum breaking load is four times the stated safe working load.
Can you provide a Material Test Certificate?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied on request with every order.
Are custom sizes available?
Yes. Custom sizes and assemblies can be built to a supplied drawing, including custom tonnage stamping and private label marking.
How are the shackles packed for export?
Cartons on pallets as standard. We can adjust carton count and pallet pattern to match your warehouse or retail pack requirements.
What finish is applied to the shackle?
The finish is self-colored, meaning no coating, plating, or powder coating is applied. The surface remains in the natural forged stainless steel state.
Need A Quote On Twisted Shackle Stainless Steel
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