How we verify the factories behind the range.

Caster supply in China ranges from integrated manufacturers with their own casting, machining and assembly to trading storefronts with a logo and a rented desk. The products can look identical in photographs. Our sourcing standard exists to tell them apart before your money does, and this page states the standard plainly — including the parts that are process rather than finished fact.

The verification standard

• Audit evidence on file. Supplying factories are checked against third-party audit records (the major inspection firms' factory audits) — audit identity and scope verified, not screenshotted from a listing.
• Production evidence. The lines that make our lead SKUs — casting, machining, tread bonding, assembly — are evidenced as in-house processes, or the bought-in components are identified as such. A factory that assembles from bought-in wheels is not rejected for it; it is specified accordingly.
• Specification capability. The factory must be able to produce to the locked-specification format: stated fork thickness, bearing options, hardness-controlled tread compounds, and dimensional records per batch.
• Sample performance. No factory supplies a lead SKU until its production sample has passed our sample protocol — dimensional measurement (including wheel width), hardness verification, and load testing per the stated convention (see quality & testing).
• Export track record. Evidence of sustained export production to specification — the discipline of export documentation and packing is part of the product.

What we deliberately do not publish

You will not find factory names, plant photographs, capacity figures or founding years on this page. Supplier identities are commercially sensitive while programmes are being built, capacity claims in this industry are routinely inflated past any audit's findings, and a photograph proves a building exists — not that your casters are made in it. What protects your order is not a factory tour on a website; it is the locked specification, the tested sample, and batch traceability, and those are the things we put in writing.

Concentration discipline

Lead lines are concentrated on a small number of verified factories rather than spread across whoever is cheapest this quarter. Concentration is what makes specification control real: the factory knows the standard, the standard is checked per batch, and a drift is caught against a known baseline instead of being discovered across five anonymous sources.