Case Study: Coil Spring Supply for a workshop chain in North America
Source:Case /
Time:2026-09-18
Coil Spring for A workshop chain in North America
A workshop chain came to us with a coil spring programme for North America. The brief was ordinary and unforgiving at the same time: a fixed launch window, a landed cost that had to survive freight and duty, and a part that had to match an existing sample. This case records what was specified, what went wrong in sampling and how the bulk order landed.
The starting point
- A supplier who changed material without saying so
- Lead time that slipped twice before bulk started
- A fitment that looked right on paper and failed on the bench
What was specified
| Part | Coil Spring |
|---|---|
| Client | A workshop chain |
| Market | North America |
| Volume | 5,000 pieces across 3 specifications |
| Base material | Nylon 66 |
| Sampling rounds | 2 |
| Delivery window | 10 weeks from PO to ex-factory |
| Compliance | CCC |
How it was resolved
- The specification was rebuilt around Nylon 66 and the tolerance locked before bulk.
- A pre-production sample was approved and kept as the golden reference.
- Production ran with in-line inspection and a mid-run photo report.
- Cartons were packed to the client's own barcode and ratio specification.
- Documentation shipped with the goods instead of after them.
Result
- 5,000 pieces delivered inside the 10-week window.
- Unit cost held within 3.0% of the original quotation.
- Inspection-related rejection stayed under 1.0%.
- The specification is on file, so reorders reproduce the approved sample.
What we would repeat
Approve a pre-production sample made from the actual bulk material. Substitute material behaves differently in service.
Planning something similar?
Send the part number, the annual volume and the target market, and we will come back with a specification and a sampling plan.
