Definition
A high-density warehouse racking system where forklifts drive directly into the rack structure to place or retrieve pallets on rails along both sides. Drive-in racks maximize storage density by eliminating aisles between rows, making them ideal for large quantities of identical products. Pallets used in drive-in racks must have precise dimensions and strong bottom decks, as the rails support the pallet by its bottom deck boards rather than its stringers.
Related Terms
Racking
The practice of storing loaded pallets on elevated warehouse racking systems (pallet racks). Racking places unique demands on pallet strength because the pallet spans across the rack beams with its load weight concentrated on the supported edges rather than distributed across a flat floor. A pallet's racking capacity is typically its most demanding load rating, and not all pallets are suitable for racking. Rackable pallets must be specifically designed and rated for this application.
Selective Rack
The most common type of pallet racking, providing direct access to every pallet position from the aisle. Selective racks consist of upright frames connected by horizontal beams, with each beam level holding one pallet deep. While selective racking has lower storage density than deep-lane systems, it offers maximum flexibility and first-in-first-out (FIFO) access to all pallets. It is the default racking choice for operations with diverse product SKUs.
Push-Back Rack
A high-density racking system where pallets are placed on nested carts that roll on inclined rails. Each new pallet pushed in moves the previous pallets back deeper into the rack. When a front pallet is removed, the remaining pallets roll forward by gravity. Push-back racks provide last-in-first-out (LIFO) access and offer higher density than selective racking. Pallets must have consistent dimensions and flat bottoms for reliable cart seating.
Gravity Flow Rack
A racking system that uses inclined roller or wheel conveyors to allow pallets to move by gravity from the loading end to the picking end. Gravity flow racks provide first-in-first-out (FIFO) inventory rotation, making them ideal for perishable goods and date-sensitive products. Pallets used in gravity flow systems must have flat, consistent bottom decks and precise dimensions to travel smoothly down the inclined rollers without jamming.
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Our glossary contains 165+ terms covering everything from pallet construction to compliance regulations and industry organizations.