Spare part for the shipping container door No. 12 – Anti Rack Ring
Czech Republic 
WITHOUT SHIPPING What is an Anti Rack Ring?
Anti Rack Ring is a specialized steel component that plays a crucial role in the safety and longevity of shipping containers. It is part of the door locking mechanism of standard ISO containers, specifically the door system with rotary lock rods. Its main function is to prevent the phenomenon called “racking” – i.e., deformation (bending) of the container door frame.
International transport subjects containers to extreme forces. Proper functioning of the Anti Rack Ring is therefore essential for:
- Structural integrity of the container
- Reliable door sealing and cargo protection
- Long service life and safe container operation
Interesting fact: Although the Anti Rack Ring is small and inexpensive, its absence or poor condition can lead to hundreds of thousands of euros in damage to cargo and the container itself.
The “Racking” problem in shipping containers
What is racking?
Racking is the term for a dangerous deformation of a container, where the rectangular door frame twists into a rhombus. It most often occurs due to lateral forces during transport:
| Cause | Description |
|---|---|
| Ship movements at sea | Extreme wave action causes impact side forces on containers in a stack. |
| Stowage and handling | Improper lifting or placement by crane creates strong temporary stresses. |
| Wind conditions | Containers on upper decks are exposed to strong gusts of wind. |
| Road/rail transport | Road or rail irregularities cause vibrations and impact forces. |
Consequences of racking:
- Door jamming, damage to hinges, lock rods and mechanisms
- Loss of door tightness – risk of water, dust, mold ingress
- Weakening of welds and the door frame’s service life
- Increased risk of accidents during handling (e.g., stack collapse)
According to ISO 1496, lateral deformation in testing must not exceed 60 mm. Therefore the function of the Anti Rack Ring is especially critical for taller containers such as High Cube (9 ft 6 in).
Detailed description and principle of operation
Construction and placement
- Material: Steel SS400 or Q235B (high toughness, corrosion resistance)
- Surface treatment: Hot‑dip galvanised or cold galvanisation for maximum corrosion protection
- Dimensions:
- Inner diameter: 11 mm (7/16 in) – for standard lock rods
- Weight: approx. 0.058 kg (some products list 0.05 – 0.1 kg depending on standard and manufacturer)
- Location: Typically 2 pieces per rotary lock rod (top and bottom), i.e., 4–8 pieces per container depending on door type
Principle and mechanism
The Anti Rack Ring acts as a solid stop between the rotary lock rod and the guiding holder (guide plate) of the container door:
- Prevents axial (longitudinal) and lateral (sideways) movement of the lock rod during transport
- Transfers forces generated by racking from the door to the container frame, preventing frame deformation
- Stabilises the entire locking system and prevents wear
Practical effect: Even a small amount of play or damage to the ring significantly raises the risk of racking and thus door failure during normal operation.
Manufacturing process and materials
Materials
| Material | Properties |
|---|---|
| SS400 | Steel with excellent weldability and toughness |
| Q235B | Construction steel, very good strength‑to‑price ratio |
Surface treatment:
- Hot‑dip galvanising – standard in maritime transport, provides long‑term corrosion protection
- Cold galvanising – more suitable for less exposed parts
Modern manufacturing methods
- Swaging: The ring is placed on the exact spot on the rod and compressed with a high‑pressure press. The rod material fills the ring’s space, creating a very strong, seamless joint. This method offers high precision and durability.
- Welding: Formerly common, now less preferred due to the risk of thermal deformation and corrosion at the weld joint.
Packaging and logistics:
Manufacturers supply the rings in sturdy woven bags clearly marked with the quantity, protecting them from damage during transport and storage.
Comparison with other anti‑racking devices
| Part type | Description and function | Advantage / Disadvantage |
|---|---|---|
| Anti Rack Ring | Ring on the lock rod, rests on the guiding holder | Standard, high effectiveness, easy replacement |
| Anti‑Racking Plate | Steel plate on the door, inserted between stops | Increases rigidity, more complex installation |
| Lock Box | Security box for the hanging lock | Provides lock protection and structural reinforcement, often used as an add‑on |
Expert recommendation: For maximum lifespan, combine all three protection types (ring, plate, lock box) on containers operating in extreme conditions.
Technical specifications of the Anti Rack Ring
| Parameter | Specification |
|---|---|
| Product designation | Anti‑Rack Ring / Anti‑bending ring |
| Model | ESEN‑D23‑13, CIMC‑D23‑13, etc. |
| Weight | 0.05 – 0.058 kg |
| Material | Steel SS400 or Q235B |
| Surface treatment | Hot‑dip galvanised, optionally cold galvanised |
| Inner diameter | 11 mm (7/16 in) |
| Application | 20 ft, 40 ft, 40 ft HC, 45 ft containers |
| Compatibility | Standard rotary lock rods (lock rods) |
| Packaging | Sturdy woven bags, moisture‑protected |
| Related parts | Lock rod, guiding holder, complete door mechanism |
| Category | Container Spare Parts |
Practical advice and replacement guide
Identifying wear:
- Play between the rod and the guiding holder
- Damage (cracks, corrosion) to the ring
- Doors that open/close poorly or show visible deformation of the frame
Replacement procedure:
- Ensure the container is empty and securely secured.
- Disassemble the door securing mechanism (including guiding holders).
- Remove the damaged ring and place a new one in the correct position.
- If using a swaged variant, perform swaging according to the manufacturer’s technical procedure.
- Check for play and door functionality after installation.
Prevention:
- Regularly inspect all locking components during each major handling of the container.
- Immediately replace damaged or corroded rings.
- Always use original or certified spare parts.
Glossary of related terms
| Term | Meaning |
|---|---|
| Corner Castings | Corner elements of a container used for stacking, lifting and securing |
| Door Frame | The container door frame, subjected to the greatest stress during racking |
| Locking Device | The complete door locking mechanism |
| Rotary Locking Tube | The rotary lock rod on which Anti Rack Rings are mounted |
| Keeper Member | The latch holder for the lock rod |
| Guide Plate | The guiding holder for the lock rod, the support point for the Anti Rack Ring |
| Container Lashing | The system that secures containers on a ship using twist‑locks and tensioners |
Conclusion: The invaluable role of the Anti Rack Ring
Although the Anti Rack Ring is a small and inconspicuous part, its importance for the safety, sealing and service life of the entire shipping container is critical. Without its proper operation, the following risks arise:
- Deformation, difficult handling and increased risk of cargo damage
- Loss of tightness and water/dust ingress into the container
- Shortened container lifespan and costly repairs
For all operators, manufacturers and service technicians, knowledge of the correct use, maintenance and replacement of the Anti Rack Ring is absolutely essential.
Catalog number: HZ000655
Price and shipping
The price is listed per single unit, excluding shipping. Shipping can be arranged via courier service or collected personally at our facility in Třebíč, Czech Republic. Shipping cost depends on the ordered quantity and destination country. We ship only within Europe.
If interested, please send an inquiry including the desired quantity through the form below. Always provide a phone number, country, city + ZIP code for delivery so we can calculate the shipping cost. We will then send you a complete quotation including transport.
We offer all spare parts for shipping containers. Spare parts are in stock and can be shipped immediately. Larger quantities are available on request.
All information, services, prices, etc., may vary. The price list is indicative; we always charge according to actual conditions.
Czech Republic 
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