Rail
The sector where the documentation weighs as much as the part. Approval processes are long, and changing supplier or routing costs more than the part does - which is why process stability matters more than peak capability.
What parts come from this sector
Bushings, axles, fastening components and drivetrain parts. Here the documentation weighs as much as the part: a stable process, dimensional control on every batch and traceability back to the heat number - asked for not at the end but from the first article.
What decides at quotation
Not “how tight can you hold it”, but “how consistently”. A process that produces one perfect part and one at the limit is more expensive than one that puts them all in the middle of the tolerance band. Hence the usual requirements: a first-article report before the series, dimensional control on every batch and traceability back to the heat number - asked for from the start, not at the end. Say up front whether the part goes into an already approved assembly: the routing can then no longer be changed along the way.
Usual materials
The groups that most often appear in this sector’s parts. What decides remains the drawing, not the sector label.
Usual processes
The processes this sector’s parts usually go through.
Documentation usually required
Usual: first-article report, dimensional control on every batch, batch and heat-number traceability, 3.1 or 3.2 material certificate. Agreed before the first article.
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