The Reorder Point That Works Domestically Will Strand You
A plant that has always bought wear parts locally develops a simple habit: order when stock gets low. It works, because the parts arrive in days. Applied to an imported supply chain, the same habit produces a machine standing idle waiting for a container that is still at sea.
The fix is not to hold more stock. It is to plan against total lead time and to understand how freight economics reward consolidation. This is how to do both.
Total Lead Time Is Not Production Time
When a supplier quotes a lead time, ask what it covers. The full clock from decision to usable stock has more stages than most quotations mention:
- Enquiry to order
- Quotation, technical clarification, and drawing or sample approval where a new pattern is involved. This stage is almost entirely within your control and is where most avoidable delay occurs.
- Production
- Casting, heat treatment, machining and finishing. Heat treatment in particular cannot be compressed without damaging the properties you are paying for.
- Pre-shipment
- Inspection, packing, documentation and booking. Container availability moves dates more often than anything in the works does.
- Transit and clearance
- Sailing time, plus port handling and customs clearance at destination. Congestion affects this more than distance.
- Inland delivery
- From port to your store. Easy to forget and rarely zero.
Add these honestly for your own route. The resulting figure — not the production time — is what your reorder point must be built from.
Reorder point = consumption during total lead time, plus a safety buffer.
Consumption measured in tonnes processed, not calendar weeks, because a busy quarter consumes parts faster than a slow one.
Working in Tonnes, Not Weeks
A set of hammers does not last three months. It lasts a number of tonnes, which takes three months at one production rate and six weeks at another.
Planning in calendar time works while output is steady and fails exactly when it matters — during the busy period when you can least afford a stoppage. If you track tonnes per set and tonnes per month, the reorder trigger becomes a number you can watch rather than a guess.
Two figures are enough to start: tonnes achieved by the last set, and average monthly throughput. Everything else follows.
Why Container Fill Changes the Price Per Part
Ocean freight is charged largely by container, not by weight of contents. The practical consequence is straightforward and often overlooked: a half-empty container costs close to what a full one costs, so freight cost per part falls sharply as the container fills.
For dense castings, weight limits usually bind before volume does, which means a container of wear parts fills up long before it looks full. That is worth knowing when planning what to combine.
The implication for ordering: a slightly larger order that fills the container can land at a lower delivered cost per part than a smaller one, even though the invoice total is higher. Compare landed cost per part, not order value.
Consolidating Without Overstocking
The obvious way to fill a container is to order more of the same part, which risks tying capital up in stock you consume slowly. Better approaches:
- Combine part types — hammers with grates, pin protectors and liners for the same machines
- Combine machines — parts for several customers or several units in one shipment
- Combine grades — a mixed order suits a jobbing foundry better than a high volume line
- Time the order to a planned shutdown, so the surrounding parts are genuinely needed rather than speculative
This is where ordering the whole wear package pays twice. It fills the container economically, and it means the new hammers are fitted into fresh grates and pins rather than worn ones — which is what makes them reach their expected life.
How Much Buffer Is Sensible
Safety stock is insurance, and the right amount depends on what a stoppage costs you rather than on a general rule.
A single production line with no alternative, contracted output commitments, or a remote site where nothing can be sourced locally.
Multiple machines, some local sourcing available for emergencies, or output that can be rescheduled without penalty.
Anything requiring pattern work has a much longer replacement clock. Running these to the wire is how plants end up idle.
Two Habits That Prevent Most Problems
First, order the next set before the current set is fitted, not before it is finished. That single change moves the whole cycle forward by one set’s life and removes most emergency ordering.
Second, send drawings, samples and approvals promptly. The stage buyers complain about least is the one they control most: a supplier waiting three weeks for drawing approval has not caused that delay, but it lands on the same delivery date.
What to Track
- Tonnes achieved per set, per machine and per grade
- Average monthly throughput, so consumption can be converted to time
- Actual total lead time on the last three orders, not the quoted figure
- Landed cost per part, including freight, duty and inland delivery
- How many hammer or bar sets each grate and pin set has seen
The third point is the one that matters most and gets recorded least. Quoted lead times are estimates; your own last three orders are data.
Send us your machines, the parts you consume and your destination port. We will give you realistic total lead times rather than production times, quote both FOB and CIF, and advise what a container of your mix actually holds so you can plan reorder points against real numbers.
Related Reading
For shipping terms and documents, see incoterms and documentation. For the wider commercial picture, see calculating cost per tonne and distributing crusher wear parts. For why the whole package matters, see pin, grate and rotor wear.