Which bearings should your plant keep in stock?
A bearing that is not on the shelf when a machine stops can cost a day of production. Here is how maintenance teams decide which spares to hold.
Every maintenance manager knows the feeling: a critical machine stops, the bearing is a size nobody stocks, and the line waits. A small, well-chosen stock of spare bearings is one of the cheapest forms of insurance a plant can buy. Here is how to decide what goes on the shelf.
1. List every bearing in your critical machines
Start with the machines that stop production when they stop: main drives, conveyors, pumps, fans and compressors. For each one, record the drive-end and non-drive-end bearing numbers in full, including suffixes such as 2RS, ZZ and C3. Motor nameplates often list them.
2. Rank them by risk
For each bearing, ask two questions:
- What does a failure cost? Lost production, overtime and knock-on damage.
- How long would a replacement take? A 6204 is available anywhere today. A large spherical roller bearing or a special-clearance spindle bearing may not be.
Bearings that are expensive to be without and slow to replace go to the top of the list.
3. Standardise where you can
You will often find the same sizes across many machines. Standardising on one brand and one version (for example, every 6205 as 2RS C3) reduces how many different spares you need and avoids fitting the wrong one in a hurry.
4. Store them properly
- Keep bearings in their original packaging until fitting
- Store them flat, dry and away from vibration
- Use the oldest stock first
5. Plan with your supplier
Share your critical list with your bearing supplier. A good supplier can tell you which items are always available locally, which need longer lead times, and how to plan regular orders. We are happy to go through your list. See our business supply page or send it to us on WhatsApp.