Stillage
Stillage is plant language, especially in UK and European automotive and discrete manufacturing, for a reusable metal cage, pallet cage, or open frame that carries parts between cells, docks, and suppliers. It is a piece of returnable packaging, not one-way cardboard. The stillage moves with the load, comes back empty, and often keeps the same identity for years while the product inside changes.
Floor teams care because the stillage is what people actually look for. A semi-finished batch, a sequenced kit, or a set of empties is usually known by the cage ID painted on the side, not by a SKU alone. When that unit sits in the wrong bay or leaves with a truck, the hunt starts. Search and find projects therefore often tag the stillage rather than every part inside it.
In twinzo and other plant copy you will also see rack or cage used for the same job. Those words are clearer for global readers. Stillage remains useful where local operations already call the unit that, and where supplier contracts name stillages on the ASN or returnable pool list.
Key Components
Reusable frame or cage: The metal body that holds pallets, stacked parts, or loose components and survives repeated forklift handling.
Identity: A durable mark (stencil, barcode, RFID, or RTLS tag) that operations and systems use to find that unit.
Loaded versus empty state: Whether the stillage holds product or waits as an empty returnable. Both states create hunt and dock problems.
Pool membership: Plant-owned, supplier-owned, or shared pool stock that must cycle back on time.
Mount points for tags: Where a location or RFID tag can stay attached through wash, stack, and trailer vibration.
Applications in Manufacturing and Logistics
Internal logistics uses stillages as the unit of move for WIP and line feed. Drivers pick a stillage ID, not a loose pile of parts. When the unit leaves a designed buffer without a system update, search and find with RTLS targets that cage on the live hall map.
Supplier loops use the same object for JIT and JIS feeds. Empties must return or the next shipment stalls. Gate reads and medium-precision indoor tracking on the stillage (or the equivalent rack) prove load list and station drop order on the twin used for internal logistics optimization.
Benefits and Challenges
The benefit is a stable physical host for identity and location. One durable tag on a stillage that circulates for years can be cheaper per trip than tagging every carton. The same ID also survives product changeovers inside the cage.
The challenge is jargon and pool discipline. Readers outside UK and EU automotive may not know the word. Tags fall off, stillages leave with carriers, and informal put-asides create side buffers the WMS never saw. If return rate is poor, hardware walk-away cost rises and search trust drops.
Related Terms
Rack and cage are the clearer global synonyms in many twinzo pages. Pallet is often the base underneath. Returnable packaging is the broader class that also includes totes and pool pallets. Asset tracking treats the stillage as the tracked asset. Search and find is the lookup job when the unit leaves its planned bay. End-to-end logistics visibility follows that unit from supplier hall to OEM station.
Frequently Asked Questions
Is a stillage the same as a pallet? No. A pallet is usually the flat base. A stillage is typically a cage or frame built to hold and protect parts, often stackable, and treated as a named returnable asset.
Should we use stillage or rack in customer-facing copy? Prefer rack or cage for global readers. Keep stillage when quoting local floor language or contracts that already use it, and link both terms in the glossary.
Why tag the stillage instead of the parts? Because the cage loops for years while the product inside changes. Linking batch ID in software to the stillage location is usually cheaper than tagging every SKU.
Does every stillage need live RTLS? No. Start with units whose hunt frequency and miss cost beat the tag. Slower empties may only need last known position at gates or buffers.