Typical pure machined components for the railway supply chain — shafts, bushings and braking parts in steel, turned, milled and ground — supplied without welding, so no welding certification is required for this scope.
| Shafts | Steel, turned + ground |
| Bushings | Steel, turned |
| Braking parts | Steel, turn-mill-grind |
| Batch range | 500–5,000 pcs per family |
| Tolerance scheme | DIN ISO 2768-mK, drawing fits |
| Documentation | EN 10204 3.1, dimension reports |
Railway supply chains are gated by welding certification (EN 15085 / ISO 3834) for welded assemblies. Components that are pure machined parts — shafts, bushings, braking components, on-board fasteners — sit outside that gate: they can be sourced from machining specialists without welding certification, provided documentation and traceability meet the railway quality expectations.
This is the entry path we offer railway customers: a clearly machined-only scope, batches from 500 pieces, and full material and dimensional documentation per shipment.
| Component (FR / EN) | Typical material | Process | Typical batch |
|---|---|---|---|
| axes, bagues, pièces de freinage (shafts, bushings, braking parts) | steel | turn-milling + grinding | 500–5,000 pcs |
Welded assemblies for railway applications require EN 15085 / ISO 3834 certification and are outside this scope; pure machined components are supplied with full traceability.
The standard flow: drawing review and quotation within 48 hours, first samples in 7–15 days, first article inspection and approval, then series production against the approved reference. Tooling, program revisions and inspection records are kept on file so that call-offs remain consistent with the approved first article.
Engineering changes — material substitutions, tolerance updates, plating or packaging changes — are handled as controlled changes against the same records.
DIN ISO 2768-mK applies as the default tolerance scheme for unspecified dimensions. EN 10204 3.1 inspection certificates are standard for metallic parts, First Article Inspection supports the approval step, and RoHS/REACH declarations are available where required. Plating, cleanliness and packaging requirements are confirmed per drawing.
Do you supply welded railway assemblies?
No — welded assemblies require EN 15085 / ISO 3834 certification. Our railway scope is pure machined components: shafts, bushings, braking parts and on-board fasteners.
Which batch sizes are typical?
500–5,000 pieces per family with recurring demand across vehicle programs.
Which documentation is provided?
EN 10204 3.1 material certificates and full dimensional reports against the drawing.
Can you support legacy rolling stock with spare parts?
Yes — drawing-based or sample-based reproduction of machined spare components, with sample approval before series supply.
Send your drawing — Sinbo Precision will review material, tolerance scheme and batch plan and return a quotation within 48 hours. Samples in 7–15 days.
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