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Cantilever Rack (also known as cantilever racking or arm racking) is a type of industrial warehouse racking specifically designed for long-length goods (steel pipes, lumber, aluminum profiles, steel sheets) that conventional racking cannot store. With a column-free front design, cantilever racking allows forklifts to access directly from one side, optimizing space and loading/unloading time. This article will explain in detail what Cantilever Rack is, its structure, classification, practical applications in Vietnam, and how to choose suitable racking for construction material warehouses, steel pipe manufacturing plants, and wood workshops.
What is Cantilever Rack? Definition and working principle
Cantilever Rack (cantilever racking) is a warehouse racking system consisting of upright columns and arms that extend outward like a crane, with no front columns blocking access. Goods are placed directly onto the arms, allowing forklifts to access them easily from the front or the side.
Unlike Selective Pallet Rack, which has an enclosed frame, Cantilever Rack is completely open at the front. Its operating principle is based on moment balance: the arms bear the bending force from the goods and transfer the load down to the upright columns and base. Long goods (6m, 9m, 12m) are placed parallel to the aisle, making it easy for forklifts to lift and retrieve them. Cantilever racking is commonly used in long material warehouses such as steel pipes, lumber, and aluminum profiles.
Detailed structure of Cantilever Rack
A Cantilever rack consists of 5 main components: upright column, support arm, base, brace, and shim plate. Each component plays an important role in the load-bearing capacity and stability of the system.
- Upright Column: Typically made of Q235/Q345 steel, H-beam or I-beam, heights from 2m to 12m. Hole spacing on the column allows arm height adjustment as needed.
- Arm: Box steel or C-channel bar, lengths from 0.5m to 2.5m. Arms can be fixed or fold up to save space when not in use. Load capacity per arm ranges from 500kg to 5,000kg.
- Base: H-shape or U-shape, designed to distribute load to the floor. Bases are typically bolted or welded to the upright column.
- Brace: Connects upright columns together, creating a sturdy frame. Braces are X or Z-shaped, made of box steel 20x40mm or 25x50mm.
- Shim: Adjusts base height when the warehouse floor is uneven, keeping the rack upright and safe.
Viet POS Rack manufactures Cantilever racks with a tolerance of ±0.1mm using CNC laser machines, ensuring assembly accuracy. The 7-step production process: order receipt → CNC cutting → bending-punching-stamping → MIG/MAG robot welding → surface treatment (powder coating 60-80μm or hot-dip galvanizing 80μm) → QC load test → packaging and delivery.
Common classifications of Cantilever Racks
Cantilever racks are classified by load capacity, structure, and application. The three main types: light-duty, medium-duty, and heavy-duty Cantilever racks. Additionally, there are single-sided and double-sided Cantilever racks.
Classification by load capacity
- Light-duty Cantilever: Load capacity ≤500kg/arm, used for light goods such as plastic pipes and small aluminum bars. Typically installed in building material supermarket warehouses.
- Medium-duty Cantilever: Load capacity 500-2,000kg/arm, common for lumber and medium-sized steel pipes. Suitable for wood workshops and furniture manufacturing plants.
- Heavy-duty Cantilever: Load capacity 2,000-5,000kg/arm, used for large steel pipes, steel plates, and machinery. Commonly found in steel warehouses and mechanical factories.
Classification by structure
- Single-sided Cantilever rack: Arms extend to only one side, relying on a wall or an independent frame. Space-saving, suitable for narrow warehouses.
- Double-sided Cantilever rack: Arms extend to both sides from the same column, doubling storage capacity. Suitable for wide warehouses with aisles on both sides.
Advantages and limitations of Cantilever Racks
Cantilever racks offer outstanding advantages in storing long goods, 100% accessibility, and flexible adjustability. However, the investment cost is higher than Selective racks and requires a warehouse floor with good load-bearing capacity.
| Criteria | Advantages | Limitations |
|---|---|---|
| Storage capacity | Holds long goods 6-12m, no length limit | Cannot hold standard pallet goods |
| Access | 100% of goods, forklift direct access | Requires wide aisles (3-4m) for forklifts |
| Flexibility | Easy height adjustment of support arms | Difficult to add more levels once installed |
| Cost | Saves loading/unloading labor, reduces time | 20-30% more expensive than Selective racks |
| Durability | Q345 steel, powder coating, 24-month warranty | Requires warehouse floor load capacity ≥3 tons/m² |
Summary table of Cantilever Rack technical specifications
The table below summarizes the main technical specifications of Cantilever racks manufactured by Việt POS Rack, complying with AS4084 and EN 15512 standards.
| Term | Definition | Example |
|---|---|---|
| Arm load capacity | Maximum load capacity per arm, evenly distributed | 2,000 kg/arm for Ø100mm steel tube |
| Column height | Maximum height of the upright column, customizable to the warehouse | 8m for a warehouse with a 10m ceiling |
| Arm length | Distance from the column to the end of the arm | 1.5m for 6m long goods |
| Material | Q235 steel (yield 235 MPa) or Q345 (yield 345 MPa) | Q345 for loads >3,000 kg |
| Surface | Powder coat 60-80μm or hot-dip galvanized 80μm | Galvanized for cold storage at -25°C |
| Standard | AS4084 (Australia), EN 15512 (Europe), KS B 6173 (Korea) | AS4084 for export projects |
Practical applications of Cantilever Rack in Vietnam
Cantilever racks are widely used in industries such as: building materials warehouses, steel pipe manufacturing plants, wood workshops, aluminum and glass warehouses, and other long goods storage facilities.
- Construction material warehouse: Stores rebar, steel pipes, structural steel, and PVC pipes 6-12m long. Cantilever racks help sort by type and size, making it easy to retrieve goods on demand.
- Steel pipe manufacturing plant: Holds finished steel pipes before shipment. Heavy-duty cantilever racks with a load capacity of 3-5 tons per arm reduce loading/unloading time by 30% compared to floor storage.
- Wood workshop: Stores sawn timber, plywood, and shaped wood bars. Medium-duty cantilever racks maximize warehouse height, increasing storage density by 40%.
- Aluminum and glass warehouse: Stores shaped aluminum bars and glass panels. Racks feature rubber-coated arms to prevent surface scratches.
- Mechanical fabrication: Stores steel plates, steel coils, and steel billets. Combined with overhead cranes for handling ultra-heavy loads.
Guide to choosing the right Cantilever Rack
Choosing a Cantilever rack requires determining: load weight, load length, warehouse height, number of product types, and budget. Below are the specific steps.
- Determine the maximum load per arm: Weigh sample goods and calculate evenly distributed weight. For example: a Ø100mm steel pipe 6m long weighs ~300kg, requiring an arm with a load capacity of ≥500kg.
- Measure load length: The arm length must be at least 1/3 of the load length. A 9m long load requires an arm length of ≥3m.
- Calculate warehouse height: Maximum column height = warehouse height – 0.5m (safety clearance). An 8m high warehouse can accommodate 7.5m columns.
- Choose the rack type: Single-sided if the warehouse is narrow (≤10m), double-sided if the warehouse is wide (≥15m).
- Request a quote and 3D design: Viet POS Rack provides free 3D design and quotes within 48 hours. Contact 0796 700 777.
Common mistakes when installing and using Cantilever racks
Below are 5 common mistakes when using cantilever racks that reduce lifespan and pose safety risks.
- Overloading arms: Placing loads heavier than the design capacity causes arm bending. Always check the load tag attached to the rack.
- Uneven warehouse floor: Racks become tilted and unstable. A load-bearing concrete floor of ≥3 tons/m² and ≥15cm thickness is required.
- Not using braces: Racks are prone to lateral tipping when impacted. X-bracing is mandatory for racks taller than 4m.
- Skipping regular maintenance: Failing to inspect bolts, welds, and peeling paint. Audits should be conducted every 6 months.
- Improper installation: Self-installing without technical drawings leads to dimensional errors. Professional technical teams should be hired.
Frequently asked questions about Cantilever Racks
What is the maximum length of goods a Cantilever Rack can hold?
Cantilever racks do not limit the length of goods, but in practice they typically store items 6-12m long. For longer items (15-18m), correspondingly longer support arms and additional bracing are required. Việt POS Rack has manufactured racks for 20m-long items for a steel factory in Bình Dương.
Are Cantilever Racks suitable for cold storage?
Yes, but hot-dip galvanized steel (80μm) must be used to resist corrosion from moisture and low temperatures. Cantilever racks for cold storage are typically designed with shorter support arms to reduce cold air load. Contact Việt POS Rack for custom design consultation.
Can Cantilever Racks be integrated with automation systems?
They can be integrated with AGVs or automated overhead cranes. However, wider aisles (4-5m) and sensors for AGV rack recognition are required. Việt POS Rack has implemented a Cantilever rack + AGV solution for a steel pipe factory in Long An.
What is the investment cost for Cantilever Racks?
Cost depends on load capacity, dimensions, and quantity. Reference prices: light-duty Cantilever racks from 3-5 million VND per bay (including 2 columns + 4 support arms), heavy-duty from 8-15 million VND per bay. Việt POS Rack provides free quotes within 48 hours of receiving warehouse information.
Do Cantilever Racks come with a warranty?
Việt POS Rack offers a 24-month warranty on all Cantilever rack products, covering manufacturing and material defects. Free maintenance is provided every 6 months during the first year. Technical support is available 24/7 via hotline 0796 700 777.
How do I know if a Cantilever rack can handle my load?
Việt POS Rack designs racks with a safety factor ≥1.5 according to AS4084 standards. You need to provide: weight per bar/pipe, length, and quantity of items per support arm. Engineers will calculate and provide specific technical specifications in a free 3D drawing.
Can Cantilever Rack be installed outdoors?
Yes, but hot-dip galvanized steel must be used to prevent rust. Outdoor racks need additional cross braces to withstand wind. Viet POS Rack recommends installing a roof cover to extend the rack’s lifespan.
Can Cantilever Rack arms be added after installation?
Arms can be added if the columns still have available holes and the total load does not exceed the design specifications. However, you should contact an engineer to inspect the structure before making changes. Viet POS Rack offers free consultation for expansion.
