DIN 345 identifies twist drills with a Morse taper shank. The taper interface is a central purchasing requirement: a drill with the correct cutting diameter can still be unsuitable if its taper does not match the machine or approved adapter. This guide explains the size fields to confirm, common ordering mistakes and how to approach a supplier with a complete requirement.
What does DIN 345 cover?
Treat the Morse taper number, cutting diameter, flute length and total length as separate fields. Do not select a drill by taper number alone. Inspect the mating arrangement and clarify whether the quoted assembly includes an adapter; an adapter changes reach and can change the setup.
The reference used here is DIN 345:2006-11. 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 345 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 |
|---|---|
| Cutting diameter | Nominal diameter and required tolerance |
| Morse taper | Exact taper size for the intended machine connection |
| Flute length | Available fluted cutting length |
| Overall length | Total tool envelope |
| Assembly | Spindle/socket and any approved adapter |
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 conventional drilling machine and a machining centre may not accept the same shank arrangement. If production is being moved between machines, send the new spindle or holder information instead of asking for an unchanged replacement. Compare tool plus adapter as an assembly, and verify access and ejection requirements before ordering.
Who can supply DIN 345 tooling?
Addison’s holemaking portfolio and Gühring’s catalogs are relevant places to begin a taper-shank drill inquiry. Confirm the exact material, length series and Morse taper on the proposed item.
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 345.
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 345 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.