Explore heavy-duty warehouse infrastructure engineered for optimal cubic utilization, dynamic gravitational flow, and high-density material handling compliance.
Push back pallet rack systems represent a pinnacle of gravity-assisted, dynamic high-density storage technology. Operating under the Last-In, First-Out (LIFO) inventory methodology, push back racking compresses the physical footprint required by conventional selective storage by eliminating dedicated retrieval aisles. Instead of driving material handling equipment inside the racking structure—as seen in traditional drive-in configurations—forklift operators deposit pallets onto nested, inclined steel carriages that glide along structural inclined steel channels.
The fundamental kinematics rely on a predetermined gravitational gradient, typically engineered between 1.5° and 2.5° (2.5% to 4.4% slope) depending on pallet deadweight, pallet bottom runner geometry, and roller bearing friction coefficients. When loading, the forklift utilizes the mass of the incoming pallet to push back the previously deposited pallet and nested carriage assembly. During extraction, controlled gravity brings the subsequent rear pallets forward to the picking face at safe, predictable terminal velocities, strictly bounded by heavy-duty bumper stops and carriage catch mechanisms.
| System Depth Class | Carriage Architecture | Standard Load Capacity | Floor Footprint Savings | Forklift Cycle Efficiency | Structural Standard |
|---|---|---|---|---|---|
| 2-Deep Push Back | 1 Single Nested Carriage + 1 Beam Position | Up to 1,500 kg / pallet | +25% Density | 35% Faster vs Drive-In | AS 4084 / EN 15512 |
| 3-Deep Push Back | 2 Multi-Tier Nested Carriages | Up to 1,400 kg / pallet | +40% Density | 45% Faster vs Drive-In | RMI MH16.1 / CE Cert |
| 4-Deep Push Back | 3 Telescoping Low-Profile Carts | Up to 1,250 kg / pallet | +55% Density | 50% Faster vs Drive-In | ISO 9001:2015 Verified |
| 5-Deep to 6-Deep | 4-5 Reinforced High-Gauge Carts | Up to 1,000 kg / pallet | +75% Density | 55% Faster vs Drive-In | Custom Seismic PE Sign-off |
At Guangzhou Heda Shelves Co., Ltd., dynamic push back carriages and upright frames are engineered from virgin cold-formed Q235B and high-tensile Q355B structural carbon steel. Upright structural stability is verified against torsional-flexural buckling modes under full rated seismic loads in accordance with Australian Standard AS 4084 and European Standard EN 15512.
Carriage wheels are CNC-turned from forged alloy steel, heat-treated for case surface hardness, and fitted with permanently lubricated, double-shielded precision ball bearings. For sub-zero cold room deployments down to -30°C, low-temperature synthetic polyalphaolefin (PAO) greases are specified to prevent viscosity thickening, cart stalling, or dynamic track bind. Beam deflection under maximum static design load is maintained within an ultra-strict limit of L/250 to L/300, guaranteeing that carriages travel without racking interference or binding throughout their operational lifecycle.
Unlike Drive-In systems where trucks enter the rack lanes, lift trucks remain in the aisle. This mitigates over 90% of structural upright impact incidents, drastically reducing maintenance downtime and structural repair costs.
Push back racks provide independent SKU management for every horizontal lane. Warehouses can store different SKUs on adjacent levels and lanes, preventing honeycombing losses common to massive block-stacking setups.
Carriages are nested within nested tracks with ultra-low profile height increments, preserving clear overhead clearance per vertical aperture and allowing up to 5-deep configurations without requiring unusual roof building heights.
Founded in 2001, we deliver tier-one heavy-duty storage infrastructure, advanced precision manufacturing, and customized engineering services to global supply chain leaders.
Year Established
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Whether executing bespoke private-label manufacturing for national racking distributors or configuring customized structural dimensions for global end-users, Heda Shelves delivers turn-key precision. Our in-house engineering team calculates section properties, dynamic rail friction margins, and maximum load capacity factors tailored to exact pallet types—ranging from standard Australian pallets (1165 × 1165 mm) to European EUR-EPAL (1200 × 800 mm) and North American GMA (48 × 40 in).
Every rack run is engineered with reference to seismic load cases (including New Zealand NZS 1170.5 and US IBC criteria). We supply verified structural engineering packs, 3D CAD design drawings, load capacity placards, and complete biosecurity export documentation (ISPM-15 compliant packaging and containerized steel cassette cradles).
Ultrasonic thickness & tensile verification of certified Q235B coils.
Automated decoiling and laser-guided hydraulic shearing lines.
Continuous pitch-calibrated punching for beam connector slots.
Multi-stand roller dies forming omega uprights and box beams.
Tolerances maintained within ±0.3mm across section geometries.
CO2 gas shielded dual-robot welding for heavy cart connectors.
Immersion pre-treatment removing surface rust and scale.
Conversion coating for long-term corrosion prevention.
Automated powder spray cured at 200°C for durable exterior finish.
Dynamic trial assembly, batch load certs, and container packing.
Anticipate market transitions across automation convergence, warehouse real estate compression, and sustainable lifecycle metallurgy.
Modern fulfillment operations are shifting away from manual reach trucks. Forward-looking push back rack configurations now feature laser-reflective navigation targets, reinforced bottom-level entry funnels, and high-precision cart centering stops engineered explicitly for autonomous guided vehicle handling.
With industrial square meter leasing costs hitting historical highs across primary global logistical corridors, 4-deep and 5-deep push back systems are frequently favored over standard selective racks. They offer an optimal balance between density, equipment capital cost, and throughput agility without the high CAPEX of fully automated AS/RS cranes.
Procurement teams increasingly require condition-monitoring readiness. Next-generation push back systems incorporate embedded RFID tracking tags, dynamic cart velocity impact sensors, and optical misalignment warnings that alert safety officers to bent pallet runners or decelerator bearing wear in real time.
Direct answers to the structural, operational, and commercial compliance inquiries most critical to procurement directors and warehouse engineers.
Partner directly with Guangzhou Heda Shelves Co., Ltd. Provide your warehouse floor dimensions, building clear heights, pallet specifications, and forklift fleet parameters. Our Senior Structural Engineering team will generate a certified 3D CAD proposal and factory-direct quotation within 24 hours.