DIN 8379 concerns subland drills with a Morse taper shank for holes prepared before tapping screw threads. The shank interface distinguishes it from the corresponding parallel-shank purchasing discussion. This guide explains the size fields to confirm, common ordering mistakes and how to approach a supplier with a complete requirement.
What does DIN 8379 cover?
Approve the pre-hole and entry geometry together with the Morse taper connection. A tool that produces the intended thread preparation still cannot be used if its taper and complete length do not fit the machine assembly. Keep the thread specification separate from the taper number in the RFQ.
The reference used here is DIN 8379:2006-11. Read the primary standard or manufacturer reference for the exact scope. For a purchase requiring formal conformance, identify the agreed edition and obtain the applicable standard and item drawing; the checklist below does not reproduce its complete dimensional tables.
Which sizes belong on the RFQ?
There is no single universal “DIN 8379 drill size.” A standard identifies a defined family or feature, while the order still needs a selected diameter and the relevant geometry. Record each size using the symbols on the supplier’s drawing, because symbol conventions can differ between catalogs. Use millimetres for dimensional fields and state any angular requirement separately.
| Size or specification field | What to confirm |
|---|---|
| Thread and tapping process | Full designation, pitch and process type |
| Pre-hole diameter | Pilot cutting diameter required for that process |
| Entry feature | Relief/countersink geometry and axial location |
| Morse taper | Exact machine or approved adapter connection |
| Tool envelope | Flute, step and total lengths on the item drawing |
If a catalog provides several rows for one diameter, preserve the full item code and any form or length suffix. Do not select a nearby row solely because the diameter matches. A tool’s nominal size, manufacturing tolerance and the component’s finished-hole tolerance are different pieces of information.
A practical selection mistake to avoid
A workshop replacing a parallel-shank thread-preparation tool on a taper-socket machine must review the interface, not simply change the purchase description. Clarify whether an adapter is part of the proposal and whether it affects access. Keep the approved head/step geometry attached to the assembly drawing when comparing offers.
Who can supply DIN 8379 tooling?
Gühring’s manufacturer catalogs include subland tool families, while DIN Media identifies the standard’s taper-shank scope. Ask the supplier to name a particular DIN 8379 model or identify a drawing-based deviation explicitly.
Use the linked catalog as a starting point, then request the exact item drawing, construction, size row and standard edition from the seller. A manufacturer’s broad tool portfolio is not evidence that every diameter or form is stocked, or that a custom proposal automatically conforms to DIN 8379.
Discuss a carbide alternative with KYTOOLS
KYTOOLS (Changzhou Kong Yun Precision Tools Co., Ltd.) publishes solid-carbide drill families and drawing-based tooling. If you are considering a carbide alternative or a special geometry, send the original standard requirement together with the part drawing and existing tool dimensions. Ask KYTOOLS to review the proposed construction and dimensional match before approval.
The published KYTOOLS catalog is the source for its listed models; this article does not declare those models compliant with every DIN number discussed. Keep any requirement for DIN 8379 conformance, including form, edition and inspection documentation, explicit in the inquiry.
A useful quotation and approval checklist
- Attach the component drawing and, if available, the existing tool drawing or printed catalog code.
- State the workpiece material, hole condition and required dimensions with units and tolerances.
- Identify the machine, holder or taper connection and the coolant arrangement.
- Name the required standard edition and any permitted deviations; request written confirmation on the proposed drawing.
- Agree quantity, measurement method, marking, quotation validity and delivery destination.
When comparing a conventional standard tool and a drawing-based carbide alternative, qualify the proposed process as well as the purchase description. Keep the approved drawing and inspection record with the item code so a later reorder refers to the same configuration.
Send your drill specification to KYTOOLS, or download the drill catalog and inquiry template.