Steellogy manufactures industrial knives in its own facility in Poland, including heat treatment, grinding and finishing. Drawing revisions and non-standard features are reviewed during quotation; material, hardness, geometry and acceptance criteria are then confirmed for the order.
In-house manufacturing versus a subcontracted supply chain
Industrial cutting parts can be bought either from a manufacturer performing core operations in-house or through a supply chain that subcontracts some or all operations. Both models exist. For a custom or repeat part, the useful question is which operations are performed internally and which technical requirements will be confirmed before manufacture.
Lead-time planning. The quotation states the proposed lead time for the defined part and production scope.
Technical definition. Geometry, material and hardness are reviewed against the drawing, sample and application data, then recorded in the quotation or order confirmation.
Non-standard work. A drawing revision, worn sample or unusual clamping feature can be reviewed before the quotation is issued.
At Steellogy, heat treatment, grinding and finishing take place in our own production facility. The material, hardness and acceptance scope remain order-specific and are confirmed in the commercial documents.
What "controlled production" means in practice
In practice, control starts with the approved specification and continues through production:
Material against the order. Grades are not interchangeable: D2 / 1.2379 is not 1.2080, and M2 is not M42. Where material-documentation requirements form part of the RFQ, the required document and review scope are confirmed in the quotation.
One controlled route. Heat treatment, grinding and finishing are carried out in-house against the buyer-approved drawing and the requirements stated in the order confirmation.
Acceptance defined before manufacture. Material, hardness, dimensions and any documentation requirements are agreed during the RFQ and quotation stage, not after the part has been produced.
Drawing review before production
Drawings for replacement parts often contain features whose function is not obvious from a catalogue description: a tolerance may control seating, a hole pattern may identify a revision, and a secondary bevel may change the cutting action. Those questions must be resolved during quotation from the drawing, revision history and, where available, a worn sample.
For a buyer running a tobacco cutter, paper slitter, wood chipper or recycling line, this matters most on non-standard parts and revisions. Technical feasibility, the proposed production route and lead time are confirmed before the order rather than inferred from the machine name.
What in-house production means for procurement
The in-house model gives procurement a clearer basis for the order:
A lead time for a defined scope. The quotation records the proposed lead time after the drawing, required operations and quantity have been reviewed.
Documentation agreed before the order. A pass-through EN 10204 3.1 mill certificate and dimensional or hardness inspection records may be available on request. Include the requirement in the RFQ; availability and scope are confirmed in the quotation.
Acceptance criteria tied to the drawing. Dimensions, hardness and any reporting scope can be agreed for the specific order instead of inferred from a generic product description.
Non-standard features defined before manufacture. Special geometries and revision differences must appear in the approved drawing or order confirmation.
Comparing a focused manufacturer with a global OEM
Procurement teams may ask whether a focused in-house manufacturer is suitable for a part previously sourced from a global OEM. The answer depends on how the part and acceptance criteria are defined.
For a replacement part, machine name alone is not enough. A drawing, part number with revision or worn sample must establish the geometry, while the quotation establishes material, hardness, quantity, lead time and acceptance requirements. Those are the points a buyer can compare between suppliers.
How to start
For a quotation, send the drawing, part number with revision and, where available, a worn sample of the part currently running in the machine. Add the machine model, material being cut, current service life and required quantity. The drawing defines the target geometry; the sample shows how the previous part wore in service.
For more on how we work, see the rest of this series: Steel grades and where we use them, How we inspect a finished blade, and What happens when you raise a complaint.