A quality agreement is usually one to three pages, and it prevents a category of dispute that a purchase specification cannot, because a specification describes a product while an agreement describes duties.
Two suppliers can build to the same drawing and still differ on who measures what, how often, which records exist and what happens when a lot fails. This is how the document is put together, clause by clause.
Quality agreement manufacturer: what the document has to settle
A quality agreement defines what conformance means.
It fixes the specification revision, the inspection duties on each side, the documents that travel with a lot, and what happens when something does not conform, so that a delivery can be judged against an agreed standard.
The reason it earns its place beside a specification is that most quality disputes are not about the product. They are about a measurement method, a sampling frequency, a document that was supposed to arrive, or a notification that was supposed to happen before a process changed. None of those is settled by a drawing.
The second reason is proportionality. A short agreement that both parties can follow is worth more than a comprehensive one that is filed and forgotten, and the clauses below are the ones that actually get used.
Scope and product coverage
The scope clause states which items the agreement covers, and it is the clause most often written too broadly.
An agreement that names a product family covers every size and variant inside it, including the ones added later. An agreement that names specific items leaves a new size outside the document until somebody remembers to extend it. Naming the family, and stating that new variants are included unless both parties agree otherwise, avoids the gap.
The scope should also state which sites are covered. Where a manufacturer produces the item at more than one plant, an agreement that does not name the sites leaves the buyer without a position when production moves.
Specifications and tolerances
The specification clause ties the agreement to a controlled document and a revision, and it is the clause that resolves most arguments after the fact.
The clause should name the drawing, state its revision, identify the critical dimensions, and say which document governs if the drawing and the purchase order disagree. It should also state how a revision change is handled, because a specification that can be amended silently is a specification that cannot be enforced.
| Element | What it states | What its absence costs |
|---|---|---|
| Drawing and revision | The controlled document that governs production | Delivery measured against a superseded revision |
| Critical dimensions | Which dimensions carry the tolerance budget | Attention spread evenly over every dimension |
| Governing document | Which document wins in a conflict | A purchase order overrides the drawing without notice |
| Revision control | How a change is issued and acknowledged | A silent change discovered during a claim |
The third row is the one that surprises buyers in practice. A purchase order written by a buyer who has not read the drawing can contradict it, and without a governing-document clause there is no agreed answer about which one the supplier should have followed.
Inspection and sampling duties
The inspection clause divides the work rather than describing it in general terms, and the division is what makes the rest of the agreement enforceable.
It should state which checks the manufacturer performs, at which stage, at what frequency, and which checks the buyer performs on receipt. It should also state the method for each check, because two parties measuring the same dimension with different instruments will reach different results and neither will be wrong.
| Check | Performed by | Frequency |
|---|---|---|
| Material grade and batch | Manufacturer, on incoming material | Every incoming batch |
| Process parameters | Manufacturer, at pressing and sintering | Every production cycle |
| Joining inspection | Manufacturer, at the brazing stage | Every lot, with sample testing where destructive |
| Dimensional and visual | Manufacturer, at final release | Every lot |
| Goods-in verification | Buyer, on receipt | Document check on every lot, physical check on selected lots |
The last row matters more than it looks. A buyer who agrees to a goods-in check of every dimension has agreed to a cost that will not be sustained, and one who agrees to nothing has left the incoming control undefined. Naming the document check as routine and the physical check as sampled is a division both parties can keep.
Documentation and certificates
The documentation clause lists what arrives with each lot, and it is worth writing as a list rather than as a description.
For a bonded wear part, the list normally covers the material declaration, the process record for the pressing and sintering cycle, the joining inspection result, the dimensional record against the revision, and the packing list with the batch reference. The clause should say whether each document travels in the box, by email, or is available on request, because a document that exists but arrives after the goods have been installed has limited value.
Where a third-party certificate is required for a specific market or tender, the clause should name it and say who pays for it. Certificates ordered after the fact are more expensive and slower than certificates planned into the production run.
Non-conformance and corrective action
The non-conformance clause defines what happens when a lot does not meet the specification, and it works when it is written before it is needed.
It should say how a non-conformance is raised, how quickly the manufacturer acknowledges it, what evidence is required, and which remedies are available. A useful clause also states the hold position: whether the buyer may quarantine the lot, whether production of the item continues, and who carries the cost of the remedies.
The corrective action part is what prevents a repeat. Requiring a written response that names the process step, the correction and the check that will catch a recurrence is a reasonable obligation, and it is the difference between an agreement that settles claims and one that prevents them. Test methods a corrective action may reference come from bodies such as ASTM International and the American Society of Mechanical Engineers.
Change notification obligations
The notification clause is the one buyers most often omit and the one that prevents the largest number of surprises.
It should list the changes the manufacturer must notify before they take effect, which for a bonded wear part normally includes the material grade or its supplier, the joining method or filler, the production site, a subcontractor for any process step, and the tooling used for the item. Each of those can change the product without changing the drawing.
Two details make the clause usable. It should state a notification period, in weeks rather than in days, so the buyer has time to respond. And it should state what happens if a change is made without notification, which is normally that the affected lots may be treated as non-conforming. Fleet-side conventions that a change might affect are published by the American Association of State Highway and Transportation Officials and SAE International.
Review and revision cycle
The agreement should be reviewed on a fixed cycle rather than only when something goes wrong.
An annual review is usually enough, timed before the buying window so that any change to the specification, the sampling or the documentation takes effect at the start of a season rather than in the middle of one. The review should look at what the agreement failed to cover during the year, which is a more useful question than whether it was followed.
The revision clause should also say how the document itself is amended, acknowledged and filed. An agreement held in two versions, each of which one party believes is current, is worse than no agreement, because it creates a false sense of a shared standard.
What a quality agreement is not
Three things are often bundled into a quality agreement and belong somewhere else.
It is not a commercial contract: price, payment terms and delivery terms belong in the supply agreement, and mixing them makes the document longer and harder to agree. It is not a specification: the drawing remains the governing description of the product. And it is not an audit report, since it states obligations rather than findings.
Keeping the document to its own subject is what allows it to stay short. Model contract terms for the commercial agreement alongside it are published by the International Chamber of Commerce, and the inspection practice the quality agreement refers to is described on the quality control page. Industry expectations for supplier documentation are published by the Snow and Ice Management Association.
FAQ
What is a quality agreement?
A short document that sits alongside the commercial contract and defines what conformance means for a specific product: the specification revision, who inspects what, which documents travel with a lot, and how a non-conformance is handled.
Does a purchase specification not cover the same ground?
A specification describes the product; the agreement describes the duties. Two suppliers can build to the same drawing and still differ on who measures, how often, what is recorded and what happens when a lot fails, and those are the points that produce disputes.
How long should a quality agreement be?
Long enough to answer the questions that come up, which for most wear parts is one to three pages. An agreement that runs to twenty pages is usually a commercial contract wearing a quality title, and the operational parts get lost inside it.
Who should sign it?
On the manufacturing side, the person accountable for quality rather than the sales contact, because the obligations inside it are operational. On the buyer’s side, the function that will raise the claim or receive the documents, which is normally quality or procurement.
If you are setting up a supplier relationship, ask SENTHAI for its standard quality annex. It states the inspection split, the document set and the notification obligations in a form both parties can work to.