Drive-in rack, also known as drive-through rack, is a type of pallet racking system designed for high-density storage of goods. It is commonly used in warehouses and distribution centers where large quantities of homogeneous products are stored.

In a drive-in rack system, pallets are stored on rails that extend deep into the rack structure, creating multiple lanes of storage. Unlike selective pallet racking, which allows access to each pallet individually, drive-in racks enable forklifts to drive directly into the rack structure to place or retrieve pallets. This design eliminates the need for aisles between the storage lanes, maximizing the use of available space.

The basic principle of drive-in rack is last-in, first-out (LIFO). This means that the last pallet loaded into a lane will be the first one to be unloaded. It is ideal for storing large quantities of the same product, where stock rotation is not a primary concern. Drive-in racks are often used for products with low turnover rates or in situations where a large quantity of a product needs to be stored temporarily.

One of the key advantages of drive-in rack systems is their high storage density. By eliminating the need for access aisles, they can maximize the utilization of available floor space. However, this comes at the expense of selectivity, as it can be challenging to access specific pallets within the system. Additionally, since forklifts operate within the rack structure, caution must be exercised to avoid damaging the racking or other pallets during handling.