SKU (Stock Keeping Unit) in the supply chain

In the highly dynamic world of intralogistics, every item must be precisely identified, tracked and picked. The key to this seamless transparency is the SKU. But this seemingly simple code influences much more than just digital inventory management. It dictates the hall layout, shapes contracts in contract logistics and determines the utilization of a logistics property.

What is a SKU (Stock Keeping Unit)?

The abbreviation SKU stands for "Stock Keeping Unit German". It is a unique, alphanumeric code that is assigned internally by a company to accurately identify and track each specific item in its inventory. In contrast to the EAN (European Article Number), which is universally standardized across industries, the SKU is determined individually and internally by each retailer or manufacturer. A SKU often contains logically structured information about product characteristics such as manufacturer, color, size, material or packaging unit. As soon as only a single feature of a product changes (for example, a T-shirt in size M instead of S), it is mandatory to get its own new SKU.

The SKU as the foundation of warehouse planning and warehouse logistics

Warehouse planning is much more than just setting up high racks in an empty hall. It always starts with an in-depth data analysis (basic determination). The first and most important questions in planning are: How many items (SKUs) are there? How large, heavy and sensitive are they? The number and nature of the SKUs largely determines which racking systems are used. A low SKU number with high quantities requires block storage or drive-in racks. An extremely high SKU variety (as in e-commerce), on the other hand, requires shelving or automated small parts warehouses (AS/RS) to ensure direct access (pick-face) for each individual stock keeping unit. As documented in detail in the warehouse space file, it is essential to precisely match logistical resources to the existing SKU structure.

The impact on the logistics property and hall

The best intralogistics is of no use if the shell – the logistics property – limits it. The architectural parameters of a hall must uncompromisingly support the user's specific SKU portfolio. If a company stores thousands of different SKUs, they must be efficiently built vertically to compensate for the expensive price per square metre. The standard for modern logistics halls today is 10 to 12 metres lower edge truss (UKB). Anything less than that wastes valuable space. For heavy shelving systems that hold countless SKUs, an extremely high floor load capacity of at least 50 kN/m² (approx. 5 tonnes per square metre) is also mandatory.

Contract Logistics: The Management of Third-Party SKUs

In contract logistics, service providers (3PL) take over the logistical processing for their customers within the framework of long-term, contractually fixed partnerships. The management of SKUs is the central operational control instrument here. By outsourcing to a contract logistics provider as part of a multi-user warehouse, companies can variabilize their fixed costs. Billing is often based on the "pay-per-pallet" model, so that only the actual inventory is paid. The logistics service provider must strictly separate thousands of third-party SKUs from different clients in its system. Inaccurate information about the SKUs (such as missing volumes or weights) leads to inefficient processes and ultimately to higher transaction fees.

Inventory optimization: ABC analysis of stock keeping units

To compensate for the high rents and transaction costs, the inventory within the hall must be intelligently arranged. In classic warehouses, up to 50 to 60% of the working time is spent on pure walking and driving distances for staff. The most effective method for route optimization is to segment SKUs according to their turnover frequency (fast-moving vs. slow-moving).

• A-items (fast-moving): These SKUs have a very short storage period and are stored close to the picking zones or the outgoing goods area.
• C-item (slow-moving): These SKUs move to the rear areas of the reserve warehouse in order not to block expensive pick places unnecessarily.

IT and technology: WMS as the digital conductor of SKUs

Modern inventory management is impossible without high-performance IT. Physical warehouse planning must be mapped precisely with the Warehouse Management System (WMS) in order to minimize distances. The WMS tracks every SKU in real time – from goods receipt to storage and shipping. By scanning barcodes directly on the shelf (scanning verification), modern technology typically reduces the error rate during picking to less than 0.1%. An extremely low error rate (pick error rate) for paperless picking is less than 0.3%, as is customary in the industry.

FAQ: SKU Frequently Asked Questions (Q&A)

Question: What is the difference between a SKU and an EAN code?

Antwort: An EAN code (or barcode) is a universal, globally standardized code that identifies a product across all trade borders. A SKU, on the other hand, is a purely internal article number of the respective company for structuring its own warehouse.

Question: Why is SKU count important in contract logistics?

Antwort: The more SKUs a customer brings into contract logistics, the more complex handling becomes. More SKUs mean a higher need for individual picking stations (pick faces) and smaller-scale inventory management, which is reflected in service level agreements (SLA) and logistics costs.

Question: How do you calculate the stock range of a specific SKU?

Antwort: The stock range indicates how long the current stock will last to meet the expected demand without the need for new goods. The formula is: Current stock level / Average consumption per period.

Conclusion: The SKU as the key to efficiency

The Stock Keeping Unit is much more than a simple combination of numbers. It is the heartbeat of warehouse logistics and the fundamental data package on which the entire intralogistics is based. Those who strategically analyze their SKUs – for example through an intelligent ABC analysis – not only optimize the use of space in their logistics property, but also drastically reduce capital commitment. Whether in your own warehouse or controlled by a professional contract logistics provider: A clean SKU architecture is the guarantee for an error-free, scalable and profitable supply chain.

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