Standard pallet racking works well for boxes and pallets. But what about 20-foot steel bars, bundles of lumber, rolls of carpet, or furniture? These long, bulky, or irregular items require a different approach — cantilever racking.
For other storage solutions, see ZEOU industrial shelving.
What Is Cantilever Racking?
Cantilever racking is a storage system designed specifically for long items. It consists of vertical columns (uprights) with horizontal arms extending outward. Unlike pallet rack, there are no front or rear beams — the arms provide open-front access, allowing forklifts or cranes to load items lengthwise from the side.
Unique advantage: The open-front design of cantilever rack allows items longer than the rack itself to extend beyond the rack footprint. A 10-foot cantilever rack can store 24-foot steel bars — something impossible with standard pallet racking.
Single-Sided vs Double-Sided
| Type | Configuration | Best Use | Density |
|---|---|---|---|
| Single-sided | Arms on one side, placed against wall | Perimeter storage, narrow spaces | Lower |
| Double-sided | Arms on both sides, aisle in middle | Maximizes storage per row | Higher |
| Mobile / movable | Cantilever on rolling bases | Extreme density, archive storage | Highest |
Arm Types & Capacities
Arms are the key component. Standard arms: 12-72 inches long, 500-5,000 lbs capacity. Heavy-duty arms: 18-60 inches, 5,000-20,000+ lbs capacity. Specialty arms: Angled (for pipes/round items), raised lip (for coil storage), wood-lined (for finished surfaces).
The Rack Manufacturers Institute (RMI) provides design standards for cantilever rack systems including arm deflection limits and column stability requirements.
Ideal Applications by Industry
- Lumber & building materials: Lumber bundles, plywood sheets, moulding, siding, decking
- Steel service centers: Steel bars, structural shapes (I-beams, channels), pipe, tubing, rebar
- Furniture warehouses: Tables, chairs, sofas, mattresses — items too bulky for standard shelving
- Aluminum extrusion: Long extrusions, window framing, curtain wall components
- Carpet & flooring: Carpet rolls, vinyl flooring rolls, area rug storage
- Plastics & composites: PVC pipes, CPVC pipes, fiberglass poles, composite decking
Cantilever vs Pallet Rack for Long Items
| Factor | Cantilever Rack | Pallet Rack (for long items) |
|---|---|---|
| Loading method | Side-loading, lengthwise | Front-loading only |
| Item length limit | Unlimited (can overhang) | Limited by beam spacing |
| Item shape flexibility | Excellent (irregular OK) | Best for uniform boxes/pallets |
| Accessibility per item | Limited by stacking | 100% per pallet |
| Cost per item stored | Lower for long items | Higher for long items (wasted space) |
Design & Configuration Guide
Key design parameters: Arm length = half the storage width needed. Arm height spacing = based on item height. Column spacing = based on item length and weight per linear foot. Brace type = “X” bracing for heavy loads, step bracing for moderate loads.
Design rule of thumb: For steel bar storage, limit arm deflection to L/180 (for a 48″ arm: maximum 0.27″ deflection under full load). For furniture storage with finished surfaces, use wood-lined arms to prevent scratching.
Outdoor Storage Considerations
Cantilever racking is frequently used outdoors for lumber yards, pipe yards, and steel service centers. Key considerations: Galvanized finish for corrosion resistance, wind loading (outdoor racks must be engineered for local wind speeds), foundation — outdoor racks require concrete foundations or heavy-duty base plates with ground anchors.
FAQ
What is cantilever racking?
Storage system with horizontal arms extending from vertical columns for long/bulky items. No front beams.
Single vs double-sided?
Single-sided = against wall. Double-sided = aisle access from both sides, higher density.
Arm capacity range?
500 lbs (light) to 20,000+ lbs (heavy industrial). Depends on arm length and gauge.
Best items to store?
Lumber, pipe, steel bars, extrusions, furniture, carpet rolls — anything long or irregular.
Can it go outdoors?
Yes. Galvanized finish, wind loading design, and concrete foundations needed for outdoor use.
Conclusion
Cantilever racking fills a critical gap that standard pallet rack and shelving cannot address — the storage of long, bulky, and irregularly shaped items. With the right arm configuration, load capacity, and finish, cantilever rack provides safe, efficient, and space-optimized storage for items that otherwise end up on the floor or in inefficient floor-stacked arrangements.
