A fabrication shop implemented lean manufacturing and reduced their raw material inventory from 30 days to 5 days of supply. They told their steel supplier: "We need deliveries twice per week in exact quantities instead of once a month in truckload lots." The supplier said "our minimum delivery is 10,000 pounds and we deliver on Tuesdays." The fabricator found a supplier who would deliver 3,000 to 5,000 pounds on Monday and Thursday. The original supplier lost a $300,000 annual account because they could not adapt their delivery model to their customer's production model.
What Lean Customers Need
Lean manufacturing customers need frequent, small deliveries of exact quantities (not "approximately 10,000 pounds" but "exactly 4,200 pounds of 16-gauge CRC slit to 6.250 inches"). They need reliable delivery windows (not "sometime Tuesday" but "between 7 and 9 AM Tuesday, every Tuesday"). They need consistent material quality (variation in gauge, flatness, or surface condition causes production stops in a lean environment because there is no buffer stock to fall back on). And they need responsive communication (if a delivery will be 2 hours late, they need to know immediately so they can adjust their production schedule).
Why This Business Is Worth the Effort
Lean manufacturing customers are the most loyal accounts a service center can have. Once you are integrated into their production schedule, switching suppliers is extremely disruptive. They have tuned their equipment to your material. Their production planning assumes your delivery reliability. Their quality system is calibrated to your specifications. Switching means re-qualifying a new supplier, adjusting equipment, and accepting the risk of production disruption during the transition. Most lean manufacturers will not switch unless their current supplier fails them badly.
The margins on lean-supply arrangements are typically 2 to 4 points higher than standard distribution because the service level is higher (frequent small deliveries cost more to execute), the material specifications are tighter (you are providing processing precision that fewer competitors can match), and the customer values reliability over price (they would rather pay 3% more for guaranteed supply than risk a production stoppage that costs $5,000 per hour).
Adapting Your Operations
Supporting lean customers requires changes to your delivery model, your processing capabilities, and your inventory management. Delivery: you may need dedicated delivery routes for lean customers with specific, repeatable time windows. This could mean a truck that runs a lean customer route every Monday and Thursday morning, regardless of how full the truck is. The economics work if the lean customers on that route generate enough margin to cover the dedicated truck cost.
Processing: lean customers need precise quantities. If they order 4,200 pounds of slit coil, they expect 4,200 pounds, not 4,800 because that is how the coil broke. Invest in accurate weighing, cutting, and quantity control at the processing stage. A $5,000 inline scale on your slitting line that ensures exact target weights pays for itself in reduced customer complaints and returns.
Inventory: stock the specific products your lean customers use and maintain safety stock levels high enough to guarantee their releases. A stockout on a commodity product is inconvenient. A stockout on material committed to a lean customer's production schedule is a relationship-ending event. Maintain dedicated buffer stock for each lean customer program, separate from your general inventory.
Getting Started
Identify which of your current customers are implementing or already running lean operations. Ask them directly: "Are you working toward just-in-time delivery from your suppliers? What would the ideal delivery schedule look like?" Many manufacturers want lean supply but have not asked their steel supplier because they assume the answer is no. Being the supplier who says yes gives you a significant competitive advantage.