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Where the ground is wet and abrasive, cutting geometry decides whether the hole is finished or the rig waits.
Get a Quote in 24 h Request a Free SampleA working face judges a consumable in metres and holes, never in appearance. The rock is hard, the cuttings are fine and abrasive, ground water is present, and every tool change is a machine standing still with a crew on shift. This page sets out the mechanism behind each specification decision, the product families used to answer each failure mode, and the way we verify what we ship.
Four variables decide whether a tool survives a shift at the face: what drives it, what it cuts, what it has to satisfy, and the way it finally gives up.
Each challenge states what goes wrong, then the geometry or material decision that answers it.
The table names the parameter, the standard that fixes it, and why a plant's quality function checks it.
| Parameter | Reference standard | What the standard fixes | Why the buyer checks it |
|---|---|---|---|
| Twist drill dimensions | DIN 338 | Nominal diameter, shank and flute proportions of a standard twist drill | Confirms the tool fits the chuck and the machine handbook |
| Hard cutting material classification | ISO 513 | The application group a carbide or other hard cutting material belongs to | Lets an engineer compare grades by application rather than by brand |
| Bonded abrasive safety | EN 12413 | Safety requirements, marking and permissible speed for bonded abrasive products | Verifies that a disc may be run on the machine in the store |
| Rockwell hardness test | ISO 6508-1 | The hardness test method, scale and reporting requirements | Gives one hardness scale for comparing suppliers |
| Limits and fits | ISO 286-1 | The system of tolerances and fit classes for cylindrical features | Confirms the shank-to-holder fit agreed on the drawing |
| Geometrical tolerancing | ISO 1101 | How form, orientation and run-out are specified and interpreted | Confirms concentricity requirements are stated unambiguously |
| Surface texture | ISO 4287 | The parameters and definitions used for a surface profile | Explains what a surface finish requirement actually measures |
| General tolerances | ISO 2768 | Default tolerances where a drawing states none | Prevents disputes about features that carry no individual tolerance |
| Corrosion testing | ISO 9227 | The neutral salt-spray test method | Gives a common basis for comparing anti-corrosion finishes |
We inspect what we ship rather than what we intend to ship, and inspection is organised into method categories instead of a single spot check. A category is described here; the values measured belong to a specific drawing and are confirmed with the batch record at order stage.
Dimensional and geometrical verification covers the features that decide whether a tool fits and cuts true: shank and drive dimensions against the referenced standard, gauge diameter and flute geometry against the drawing, and run-out expressed as a geometrical tolerance rather than as an approximate statement. Where a drawing states no individual tolerance, the ISO 2768 default applies.
Hardness verification uses the standardised test method of ISO 6508-1 on the material concerned, so a figure can be compared across suppliers and across production lots. Heat-treatment condition is reviewed at the same stage, because hardness by itself does not describe how a part behaves under cyclic load.
Surface treatment and corrosion protection are checked as a treatment result rather than as an appearance: condition after plating, coating or blasting, and where applicable a salt-spray comparison run to the ISO 9227 method. Abrasive and cutting products are checked against the safety standard for the product type, including EN 12413 for bonded abrasive products.
Batch-level traceability is maintained so that a shipment can be traced to the material lot and to the inspection record that released it. Material certificates accompany steel lots where the drawing calls for them. Destructive work — braze shear, torque to failure and service-life testing — is arranged on request for a named product family, and the method and the condition tested are stated together with the result. Where a capability is not held in house, we say so rather than present it as our own. Our management systems are certified to ISO 9001, ISO 14001 and ISO 45001, which form the framework the inspection sequence runs inside rather than a substitute for the individual checks.
Three OEM levels are offered, and they differ mainly in how much of the drawing is touched.
The hard cutting material and how much of it the bit carries, the way it is joined to the body, the shank tolerance, the number of production steps and the inspection applied. Steel price alone explains very little. Sending the rock class and hole diameter lets us quote against a specified grade rather than a house grade.
From the rock class, the ground water condition, the drilling method and the machine, using the ISO 513 application group as the common language. A grade chosen for one rock type is not automatically correct for another, which is why the application is part of the enquiry rather than an afterthought.
Yes. Samples are drawn from qualified tooling, issued against a stated application, and supplied with the relevant inspection record. Where performance depends on the ground being worked, sending a rock or liner sample is more useful than sending a specification sheet.
A batch inspection record covering the characteristics agreed for that part, and material certificates for steel lots where they apply. Destructive test results and salt-spray comparisons are available for a named family on request.
Yes, through Level 3 development from a sample or drawing. Taper angle, shank length and flushing arrangement can all be set to your system, and a manufacturing review comes back before cutting starts so anything that cannot be held is raised in advance.
Send the rock class, the hole diameter and the machine you drill with, and we will respond with a grade recommendation and a quotation against it. If you would rather test first, request a sample and tell us the ground condition it will run in.
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