Total Cost of Ownership: why price per piece is a pitfall when choosing a metal component supplier

The price per piece is the most misleading metric in industrial procurement. An experienced buyer knows that Total Cost of Ownership (TCO) includes dozens of hidden costs — and the difference between the cheapest supplier and the best supplier can be up to 30% in favour of the latter. Mepro Sisteme delivers over 80,000 machined parts monthly in the EU and has documented each component of TCO.

The eight components of real TCO

• Negotiated unit price (typically 55-70% of TCO)
• Transport and insurance (3-18%, depending on origin)
• Customs and import duties (0-12%)
• Cost of immobilised stock (2-8% for lots with long lead times)
• Reject detected upon receipt (0.2-3%)
• Reject detected in own production (0.1-2%)
• Line stoppage cost due to delayed delivery (variable, can escalate)
• Administrative cost per supplier relationship (~2,500 EUR/year)

Concrete numerical example

S355 steel support, 8,000 pcs/year. Supplier A (Asia): 4.20 EUR/pc, lead time 42 days, reject rate 1.8%. Supplier B (Romania): 4.95 EUR/pc, lead time 8 days, reject rate 0.3%. For a complete TCO calculation, Supplier A comes out at 5.68 EUR/pc equivalent, Supplier B at 5.21 EUR/pc. Difference: 3,760 EUR/year saved with the 'more expensive supplier'.

The hidden cost of rejects

A reject detected upon receipt costs 1× the price of the part. A reject detected in own production costs 8-12× (labour already expended, line stopped). A reject reaching the end customer costs 40-200× (recall, compensation, reputation). That is why the real, statistically measured Cpk is worth more than promises in the offer.

“Good buyers don't negotiate the price — they negotiate the process.”

How Mepro delivers transparent TCO

For each quotation, we provide an indicative TCO calculation that includes guaranteed lead time, historical Cpk for similar parts, control plan, and recall policy. This transparency is why 78% of our European clients have framework contracts for a minimum of 3 years.