Sep 30, 2026Sourcing Guides
How to Read a Spec Sheet from a Chinese Factory
Material grades, tolerances, finishes and the lines that are missing: a line-by-line guide to reading - and confirming - a Chinese factory specification sheet.
A specification sheet looks authoritative - until two factories send you different documents for the same product and both claim to be correct. Reading a spec sheet from a Chinese factory is a skill: knowing which lines matter, which numbers need written confirmation, and which vague phrases should stop the conversation. This article walks through a typical spec sheet line by line.
Material and grade lines
Material lines should name a specific grade - for stainless steel, 304 or 316; for plastics, the exact resin - not phrases like high-quality material or premium steel. If a grade appears, ask whether it can be verified: material certificates from the mill, or a third-party test on the finished batch. A grade the factory cannot evidence is a preference, not a specification.
Dimensions and tolerances
Dimensions are easy; tolerances are where factories differ. Confirm which tolerances the factory holds in normal production and which require extra cost or slower cycles. Record them as ranges in writing, and reference your approved sample as the arbitration standard when a measurement falls between the lines.
Surface finish and color
Finish descriptions - polished, powder coated, anodized - need a reference: a physical sample, a plating thickness, or a color code matched under agreed lighting. Color is the most common first-order dispute, so lock the standard before production and keep the golden sample with the factory.
Compliance and testing lines
If a spec sheet claims compliance - food contact, RoHS, CE - ask which document proves it and request the certificate number. Certificates have issuing bodies, scopes and expiry dates; a claim without a verifiable document is marketing text, not a specification.
The lines that are missing
The most important reading skill is noticing what the sheet does not say: packing method, labeling, weight per carton, spare parts, warranty terms. Missing lines are the space where assumptions grow into disputes, so add them to the purchase order explicitly rather than assuming the factory default.
Frequently asked questions
Should I trust a spec sheet sent as a photo?
Photos of documents are normal, but ask for the original file and cross-check key numbers against the quotation - mismatches between the sheet and the quote are an early warning.
Who fills in the numbers I need but the sheet omits?
The supplier, confirmed against production reality - never fill in spec numbers yourself, and treat any number a trading intermediary invents on your behalf as unverified.
Can I use my own spec sheet template?
Yes, and many experienced buyers do - send your template and have the factory confirm each line rather than returning their glossy sheet.
Migibio Sourcing reviews supplier spec sheets as part of supplier sourcing and price comparison - send us your product and we will confirm the specification before you commit.
