Second source, discontinued part or repeat wear part — how to qualify a replacement industrial knife
A single supply route, a part the machine builder no longer supports, or a lead time that does not fit the maintenance plan are all reasons to look for another manufacturer. This page explains what each situation needs, what to send us, and how the part is qualified before the first order.
See the three situationsIs this route for you?
This page is written for purchasing and maintenance teams that need a defined, repeatable replacement part. It is not a catalogue: every part is manufactured to a specification you approve.
A good fit when
- You need an additional source for a knife or cutting part that is replaced regularly.
- The part belongs to older or unsupported equipment and the documentation is incomplete or missing.
- The same part will be ordered again, and you want it made against one approved revision every time.
Not enough on its own
- You have only the machine name and no drawing, part number or physical part to measure.
- Material, geometry, tolerances or acceptance criteria cannot be agreed before production.
Supply continuity and a second source
Dependence on one supplier is a supply risk, not a technical problem. The part is already defined: you have an approved drawing or CAD file and a revision, and the aim is to obtain the same part from an independent manufacturer under the same specification.
Qualification starts from that drawing. We confirm steel grade, heat treatment, hardness, geometry and tolerances against it, state them in the quotation, and — if your process requires it — manufacture a first article or a trial batch for your approval before series supply.
What to send
- Approved drawing or CAD file with revision number
- Annual or per-order quantity and the application (machine, material cut)
- Inspection and batch-documentation scope you require
Legacy, discontinued or unsupported part
When the machine builder no longer supplies the part, or the original documentation was never handed over, the starting point is whatever exists: a partial drawing, a part number with revision, or the worn part itself. A worn part is a valid basis for a quotation — we measure it and reconstruct the geometry.
Wear removes information. Edge dimensions, tolerances, steel grade and hardness cannot be read from a used knife alone, so we reconstruct them from the measurement, the application and our manufacturing practice, and confirm them with you in writing before manufacture. The agreed specification then becomes the reference for every repeat order.
What to send
- Whatever documentation exists: drawing, sketch, part number, revision
- The worn part (or clear photographs with dimensions, to start)
- Machine type, material processed and the function of the part in the line
Repeat wear parts
Knives and cutting parts are consumables. Once a part is qualified, the economic case is in repeatability: the same approved revision, the same material and hardness, the same inspection scope, ordered again without re-qualification.
If service life or cut quality has dropped, that is a reason to review — but the knife is one variable among several, alongside mounting, machine settings and the material being cut. We compare against a fixed baseline: approved revision, process conditions, running time or throughput, and an agreed measure of the result.
What to send
- Expected quantity and replacement interval
- Current approved drawing, or a master sample tied to a written specification
- Agreed revision and acceptance criteria for repeat deliveries
From technical reference to an approved order basis
The process separates three things: why you are looking for another source, the evidence that defines the part, and the commercial fit of repeat demand.
Describe the situation
State which of the three situations applies, the application, the quantity and whether the requirement will repeat.
Provide the technical reference
Send the approved drawing or CAD file with its revision. If these do not exist, send the part number, the worn part and the machine context.
Agree the specification
Steel grade, heat treatment, hardness, geometry, tolerances, documentation and acceptance criteria are stated in the RFQ and confirmed in the quotation.
Approve the order basis
Where the order confirmation provides for a first article or trial batch, you check it against the agreed criteria. The approved revision then governs every repeat order.
Applications and parts we manufacture
Choose an application to see the relevant parts and technical information.
How to compare and qualify an industrial-knife supplier
Technical capability, specification control, inspection evidence and commercial terms — what to check before a trial order.
Documentation and confidentiality
Batch documentation — mill certificate pass-through per EN 10204 3.1, hardness and dimensional inspection records — is available on request; the scope is agreed in the RFQ and confirmed in the quotation. An NDA can be signed before any technical documentation is exchanged. Company data for supplier qualification (VAT ID, registered address, terms of sale, complaint procedure) is on one page.
Start with the part, not just the machine name
Send the drawing or CAD file with its revision. If all you have is a worn part, send that and describe the application — we will tell you which values need confirming. The machine name narrows the search; the specification defines the part.