Spare part for the shipping container door No. 4 – Split Large Bush

Split Large Bush Spare Part for Shipping Container

What is a Split Large Bush?

Split Large Bush (large split bushing) is an essential spare part in the field of maintenance and repair of standard ISO shipping containers. It is located in the door locking mechanism – specifically in the bearing bracket that holds the vertical lock rod. Its role is to ensure smooth, quiet and safe movement of the lock rods during everyday door operation.

Split (divided) means that the part consists of two precisely shaped halves that join directly around the rod on site. This allows the bushing to be replaced without dismantling the door mechanism, a major advantage for containers in service.

The Split Large Bush is designed for long‑term durability in extreme transport conditions – from tropical heat to arctic cold, on sea and on land. It acts as a “sacrificial layer”, protecting more expensive metal components from wear, corrosion and vibration.

Detailed Description, Technical Characteristics and Material Composition

Anatomy of the Split Large Bush

Why nylon?

• High wear resistance: Nylon is extremely tough and suited for sliding applications, preventing groove formation and extending mechanism life.
• Low friction coefficient: Ensures smooth rod movement without catching.
• Chemical and weather resistance: Nylon does not corrode, retains strength in moisture, and resists most salts, acids and UV radiation.
• Flexibility: Absorbs vibrations and impacts, which is crucial during transport and handling.

Split design – The divided construction enables easy installation even in hard‑to‑reach locations and reduces the risk of damaging the lock rod, which would otherwise require complex disassembly.

Function in the Door Locking System

The ISO container door lock system is robust and consists of several key components:

• Lock rods: Vertical steel rods mounted on the door that rotate to latch the door into the frame.
• Bearing brackets: Metal housings welded to the door in which the rods rotate.
• Bushings: The Split Large Bush is placed between the rod and the bracket, minimizing friction, protecting against wear and ensuring smooth motion.

Key functions of the Split Large Bush:

• Friction reduction: Without a bushing, metal‑on‑metal contact causes rapid wear, groove formation, corrosion and handling problems.
• Mechanism protection: The inexpensive plastic bushing is easily replaceable, unlike a costly and labor‑intensive rod or bracket replacement.
• Stability assurance: Fills the clearance between rod and bracket, preventing wobble and ensuring precise rod guidance needed for proper locking.
• Prevention of galvanic corrosion: Physically separates two different metals, avoiding electro‑chemical corrosion in the presence of moisture (very important for containers with mixed steel types).

Types of Split Bush: Large vs. Small

The door locking mechanism typically uses two types of bushings:

• Large Split Bush: Intended for the longer, more robust bearing bracket that carries the main load and vibration.
• Small Split Bush: Fits the shorter bracket with lower load.

Both variants are essential for correct door operation and are often ordered together as a set (e.g., “bearing bracket set with bushes” – a set of short and long brackets with matching bushings).

Comparison

NOTE: Before ordering, always verify the bushing type and dimensions for the particular container and manufacturer. Compatibility is crucial for proper system function.

Technical Specifications

• Material: Nylon PA66, UV‑, water‑, sea‑salt and most chemical‑ resistant
• Large Split Bush dimensions: 113 × 52 × 52 mm
• Inner diameter: 24–26 mm, suitable for most ISO lock rods
• Weight: approx. 0.10 kg
• Colour: Black (standard), sometimes white or gray depending on the supplier
• Certification: Manufacturers often provide ISO 9001 certification and additional test reports for technical polymers

Other market names:

• Shipping container lock split bush
• Container lock split bush
• Split bush larger plastic
• Bush larger plastic inner
• Lock split bush larger
• Split bush container door
• Plastic bushing for lock rod

Installation and Maintenance – Professional Procedure

Replacing a Split Large Bush

1. Preparation:
   • Clean the area around the bearing bracket from debris, rust and remnants of the old bushing.
   • Inspect the lock rod for bends or damage.

2. Placement:
   • Open the split bushing and position it around the lock rod at the point where it passes through the bracket.

3. Snap‑in:
   • Join the two halves so they sit tightly and precisely around the rod.
   • Insert the assembled unit into the bracket opening, or snap it in according to the design.

4. Check:
   • Rotate the rod several times – movement should be smooth, quiet and free of catching.
   • Verify that the bushing stays firmly in place and does not rotate with the rod.

5. Finish:
   • Apply a suitable plastic‑compatible lubricant if needed (do not use mineral oil, which can degrade nylon).

Signs That Replacement Is Needed

• Harder rod movement, requiring extra force or “shaking”.
• Grinding or squeaking noises – metal on metal.
• Visible damage to the bushing – cracks, gouges, deformation.
• Excessive play of the rod in the bracket – wobbling, unstable mechanism.

Important tip: Timely replacement of the Split Large Bush greatly extends the door mechanism’s service life and avoids costly repairs such as welding new brackets or lock rods.

Practical Applications of the Split Large Bush

The Split Large Bush is a universal part suitable for:

• Standard dry containers (Dry Van): Frequent opening/closing cycles and exposure to weather.
• Reefer containers: Critical for maintaining door sealing and stable cargo temperature.
• Container conversions: Living modules, offices, technical shelters – reliable locking is essential.
• Special containers: Tank containers, chemical storage, mobile workshops, etc.

Example Uses

• Mobile offices, nurseries, medical facilities – secure locking = safety and comfort.
• Construction sites and depots – resistance to theft and weather.
• Container solutions for homelessness or social projects – daily use, emphasis on simple, low‑cost maintenance.

Related Components and Terms

Common Mistakes and Practical Recommendations

• Using non‑original bushings: Low‑quality material wears quickly and causes door problems.
• Incorrect installation: Mis‑alignment leads to rotation or loss of the bushing.
• Neglecting maintenance: Regular inspection and replacement of the Split Large Bush is vital for the overall lifespan of the container.

Conclusion

The Split Large Bush demonstrates how even a small, unobtrusive component plays a vital role in the safety, functionality and longevity of a shipping container. Proper maintenance and timely replacement of this bushing are an investment in long‑term reliability and protection of your assets.

Catalog number: HZ000684

Price and Shipping

Price is listed per unit, excluding shipping. Shipping can be arranged via courier or collected in person at our facility in Třebíč, Czech Republic. Shipping cost depends on order quantity and destination country. We ship only within Europe.

If interested, please send an inquiry including the required quantity, phone number, country, city and postal code so we can calculate shipping costs. We will provide a complete quotation including delivery.

We offer all spare parts for shipping containers. Parts are in stock and can be dispatched immediately; larger quantities are available on request.

All information, services and prices may vary. Prices are indicative; actual billing is based on the final order.