Magnet category strategy & supplier segmentation

Build the spend cube first

Almost every magnet category plan begins with bad data, because magnets hide. They arrive inside motors, inside sensor assemblies, inside subassemblies bought from contract manufacturers. A spend extract filtered on obvious commodity codes will typically find a fraction of the real exposure.

Before any strategy work, build a cube with five dimensions and accept that assembling it will take longer than the analysis that follows.

The two columns most often missing are the ones that matter most. Downstream revenue exposure converts a $40,000 line item into a $12 million risk, which is the only framing that gets attention outside procurement. Rare-earth mass gives you a physical exposure measure that is immune to price movement — useful precisely when prices are moving.

Position the part families

With the cube built, plot part families on supply risk against spend and profit impact. Do it at family level, not part level — forty part numbers of the same grade from the same supplier are one position, not forty.

Score supply risk on inputs you can defend: number of qualified sources, heavy rare-earth content, origin concentration, export-licensing exposure, qualification lead time, and whether a design change would be needed to switch. Score impact on annual spend and downstream revenue, taking the higher of the two.

Two mistakes recur. Running a reverse auction on a strategic magnet destroys the relationship you will need during allocation, and saves less than a grade change would. Ignoring bottleneck items because they are cheap is how single-source dependencies survive for a decade without anyone deciding to keep them.

Segment the supply base

Supplier segmentation should follow from the position of the parts they supply, not from revenue ranking. A supplier of a single bottleneck part may warrant more management attention than a larger supplier of leverage items.

The qualified alternate tier is the one that decays. A second source that has never shipped production volume is a document, not a capability. Tooling drifts, contacts leave, the qualification lapses against the current drawing revision, and the alternate discovered during a crisis turns out to need a requalification cycle you do not have time for.

Fix it with volume. Place a small, regular share — even five percent — with each qualified alternate. It costs a little in unit price and it keeps the relationship, the tooling and the qualification live. Treat that premium as an insurance line in the category budget, and defend it as one.

Segmentation should also record what each supplier actually controls. A supplier who sinters in-house, buys alloy from two sources and coats internally is structurally different from one who buys finished magnets and relabels them — even when both quote the same price and hold the same certificate. That distinction belongs in your audit record.

Match the sourcing model to the segment

One sourcing model across a magnet portfolio guarantees that some parts are over-managed and others are exposed. Set the model per quadrant and write it down, so decisions are made once rather than relitigated every quarter.

Bottleneck items justify the highest inventory cover in the category, which is counterintuitive because they are usually the smallest spend. The logic is simple: cover should be sized by the cost of a stockout and the time to obtain an alternative, not by the value of the item. A cheap part with a nine-month qualification path warrants more stock than an expensive part with three approved sources.

For leverage items, distributor stocking programs generally beat holding inventory yourself. Someone else carries the working capital and the obsolescence risk, and you retain the option to move volume. Structure it through blanket orders, consignment or VMI rather than through spot purchasing, which gives up the leverage without saving anything.

Dual-source ratios and allocation rules

Deciding to dual-source is the easy part. The decisions that determine whether it works are the split and the rules governing it.

The origin split is where most dual-sourcing quietly fails. Two suppliers in different countries can still depend on the same alloy producer, the same separation capacity, or the same export-licensing regime. The finishing location tells you very little about whether the upstream chain is genuinely independent. Trace at least to the alloy source before calling a second source diversified, and treat that trace as part of risk mapping rather than as a procurement formality.

The category scorecard

Category strategy that is not measured reverts to firefighting within two quarters. Keep the scorecard short enough that it is actually maintained, and make sure it measures the strategy rather than the purchasing department.

Notice what is absent: cost savings as a headline metric. In a category where input prices can move more than 80% in a year, a savings number measured against last year's price is noise. Price variance against a should-cost model is the honest measure, and it is defensible in both directions — it lets you demonstrate value in a rising market, which a conventional savings metric never will.

Alternate currency is the metric most worth adding if you add only one. It is the difference between a resilience strategy that exists on paper and one that will function.

The twelve-month category plan

A magnet category plan does not need to be long. It needs to be specific about what changes, who owns it, and by when. A workable first-year sequence:

Quarter one — see the category

Complete the spend cube including assembly-embedded magnets. Map origin to alloy level for the top twenty parts by revenue exposure. Build should-cost models for the five largest and the five most volatile. Publish the single-source exposure number.

Quarter two — fix the bottlenecks

Attack the top-left quadrant first, because it is cheap to fix and expensive to ignore. Start qualification on alternates for the highest-exposure single-source parts. Review over-specified grades with engineering against real duty cycles — reducing unnecessary heavy rare-earth content lowers cost and licensing exposure at the same time, and is often the highest-return action available.

Quarter three — restructure commercially

Convert strategic parts to term agreements with index-linked pricing and defined allocation priority. Put leverage volume through a stocking program. Establish allocation ratios and surge clauses. Set the insurance-volume budget for keeping alternates warm.

Quarter four — institutionalize

Run the first full scorecard. Hold quarterly business reviews with strategic and bottleneck suppliers, covering capacity, roadmap and risk rather than price alone. Refresh the risk register. Set next year's targets on exposure reduction rather than on savings.