When an industrial buyer orders a solid-carbide drill, a drill with a brazed carbide tip is not an interchangeable description. Nor is a drill with a replaceable carbide head the same construction. Each design can be appropriate for a different application, but the purchase order, delivered item and inspection record must describe the same thing. This guide focuses on incoming identification, rather than the broader pre-shipment checks in our OEM drill-bit inspection checklist.
First identify the construction specified
“Carbide” may refer to the whole working drill, a brazed cutting tip, a detachable head or an indexable insert. The word alone does not establish the construction. Tool maker Kennametal describes solid-carbide, steel-body carbide-tipped, indexable and modular drilling alternatives; these are distinct designs rather than grades of the same part. Kennametal’s holemaking overview
Before opening the box, bring together the agreed part drawing or controlled specification, order acknowledgement, approved sample or sample report, and purchase-order revision. Confirm the entire cutting assembly: diameter and tolerance; usable length and flute length; shank; point and flute geometry; coating; coolant arrangement where applicable; and construction type. A correct diameter does not cure delivery of the wrong construction.
A four-stage receiving check
| Stage | What to check | What it can and cannot establish |
|---|---|---|
| 1. Identity | Order number, item code, marked dimensions, quantity, batch or lot, packing label and revision | Establishes traceability; a matching label alone does not prove material. |
| 2. Configuration | Compare assembly, joint or interface, cutting edges, shank and coating with an approved drawing and sample under adequate lighting | A visible joint can be a useful discrepancy; coating and a smooth transition can also conceal construction. |
| 3. Dimensions | Measure the specified features with calibrated instruments using the agreed method and sampling plan | Verifies those measured features, not the carbide grade or hidden interface. |
| 4. Documentary or laboratory evidence | Request the agreed material/grade declaration, inspection record and, for a justified dispute, an agreed independent method on an authorised sample | Test scope, sample location and acceptance criteria must be specified before results are interpreted. |
Photograph the item beside its box label and record which parts of the drill were examined. If a supplier offers a certificate, verify that it identifies the relevant lot and the precise component to which the declared material applies. A carbide-tip certificate does not automatically certify the body as solid carbide.
Why quick “magnet tests” are not proof
A handheld magnet or a drill’s colour is not a conclusive identification test for its construction or grade. A magnetic response may involve the holder, steel body or other components; surface coating and lighting can alter appearance. Even a measurement taken on the cutting edge would not, on its own, describe the whole shank. Treat these observations as prompts to check the drawing, not as a pass/fail release rule. Do not scratch or destructively section a saleable item without the agreed sampling and disposition procedure.
For high-value orders, agree before shipment which evidence is sufficient. This might include retained approved samples, lot-level process or material declarations and specific third-party analysis if the contractual risk warrants it. Avoid promising that one generic handheld test can determine every carbide composition. Our drill-bit materials guide explains material categories; this receiving procedure addresses whether the delivered construction matches the order.
What to do when results disagree
Quarantine the affected lot without mixing it with accepted stock. Record the supplier, order, batch, quantity, drawing revision, photographs, measurement instrument and exact discrepancy. Ask the supplier for written clarification and agree a representative sample and inspection method before deciding on rework, replacement or rejection. Do not turn a photograph of one drill into an unsupported allegation about an entire shipment.
Buyer request template
Please confirm whether part [code/revision] is solid carbide throughout its cutting and shank body, a brazed carbide tip on a steel body, or a replaceable-tip assembly. Identify the material and lot of each relevant component, the drawing and inspection method used, and the procedure for resolving a construction discrepancy on receipt.
Bottom line: the reliable question is not “does it look like carbide?” but “does this traceable lot match the agreed construction and acceptance method?” If you are preparing an OEM RFQ, send the controlled drawing, target application and intended inspection criteria with the enquiry rather than relying on the term “carbide drill bit” alone.