How to confirm specifications before ordering automotive products

Most sourcing disputes do not begin with a bad factory. They begin with a description that two people read differently. "Strong tow strap, 5 metres" is not a specification — it is a starting point for an argument about webbing width, stitching, hook type and whether the load rating refers to working load or breaking strength.

The method below turns a description into a document that production can be held to, and that an inspector can measure against. It has six parts, and skipping any one of them leaves a gap that shows up at the worst possible moment.

1. Material and construction

Name the material, not the category. "Plastic housing" and "ABS housing with UV stabiliser" are different products with different costs, and one of them will fade on a dashboard in a warm climate.

• Base material and grade, where the grade affects durability or appearance
• Construction method: moulded, welded, stitched, plated, bonded
• Any treatment that matters in use — UV stabilising, anti-slip coating, rust protection
• Weight or thickness where it drives feel and durability

2. Dimensions and ratings — with test conditions

This is where most automotive specifications fail. A number without a condition is not measurable. Peak current at what temperature? Load rating measured on new webbing or after cycling? Pressure rating at which temperature?

State the measurement method too. If a dimension is checked with a calliper at a defined point, say so; if a rating comes from a type test rather than a batch test, say which.

3. Finish, colour and appearance tolerance

Appearance disputes are common on interior accessories because the reference is a photograph. Use a physical sample or a colour code, and state how much batch variation is acceptable before the order starts rather than after the second container arrives.

• Finish name: matte, soft-touch, gloss, anodised, chrome-plated, powder-coated
• Colour reference: sample, code, or approved master swatch kept by both parties
• Acceptable variation, expressed as something a person can judge consistently
• Where the visible surface is versus where minor marks are tolerable

4. The accessory list

Everything in the box gets a line. This is the single most under-specified part of automotive orders, and the part your customer notices first. Whether the clamps are fused, whether a carry case is included, whether the instruction sheet is in the destination language — each one changes whether the unit can be resold as received.

• Every cable, adapter, spare part, tool and document in the package
• Instruction sheet and label language, specified per market rather than assumed
• Quantities: how many of each component per unit
• What is deliberately not included, so nobody assumes it

5. Packaging and carton data

Packaging is a cost and a lead-time driver, and it is decided before print. Retail colour box, neutral box or poly bag; barcode symbology and number; label text; units per inner and per carton; carton dimensions and gross weight.

Carton data is not paperwork — it feeds your freight calculation and your warehouse slotting. Getting it wrong is discovered at the loading bay, when changing it is expensive.

6. Inspection terms

The specification is only enforceable if something checks it. Agree the sampling basis, what counts as a critical, major and minor defect for this item, and what happens to non-conforming units before shipment.

A scratch is a major defect on a visible interior panel and a minor one on a hidden mounting bracket. The classification has to be written per item, not copied from a template.

How to use this before you send an inquiry

1. Write the six headings and fill in what you already know, even roughly.
2. Mark what you do not know as a question rather than leaving it blank — a blank reads as "supplier's choice".
3. Attach a reference sample or photograph and state which properties of it matter.
4. Send it with the target quantity and destination market, and ask for the open points to be returned in writing.

The reply you get back tells you a lot. A supplier who returns a numbered list of open questions is reading the document. One who replies with a price and no questions is quoting something, but not necessarily your product.

Where to go next

Once the specification is settled, the next constraint is usually volume and cost structure. The companion guide on small trial orders covers what a first order should test and which costs are unavoidable at low volume. If packaging is still open, retail-ready vs neutral packaging compares the two paths directly.

Our own process for agreeing a specification is described on the Sourcing & Supply page, and the inspection terms in part six are set out in more detail under Quality & Compliance.