Date stamps do an important job in any mould. Every part they mark carries a record of when it was made, which matters for traceability, quality checks and any customer query that comes back months later. That record is only useful if it is right, and a date insert that has become out of position under injection pressure can mark a whole run of parts with the wrong date before you notice.

The annual date change adds its own pressure, because it lands at the same point every year and competes with production for the same machines. Knarr's marking stamps with latching function were designed to solve both problems, and they are currently part of Knarr's Sale 2026/27.

How the latching function works

Without a latch, higher injection pressures can nudge an adjustable insert out of position. Knarr's latching version adds a mechanism that snaps the insert into place, preventing unintended movement and the incorrect marking that follows. The insert stays exactly where it was set, even at higher injection pressures, so the date on the part is the date you intended.

Changing the date is straightforward too. The insert is set with a dedicated screwdriver, and the latch snaps it into place, which makes the annual change quick and keeps it exactly where it was set. The short versions fit quickly via a press fit, and across the range there are options for press fitting or assembly from the front or back of the plate, so the stamps suit a wide range of mould designs.

Dropping into existing tooling

Each latching stamp is interchangeable with the standard Knarr part it replaces, so upgrading does not mean redesigning the mould.

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The matching adjustable insert, 601070, works with all five latching stamps.

Knarr SALE 2026/27

Knarr's year-end sale is focused on process reliability, and the latching marking stamps are at the heart of it. The sale covers the five latching stamps above, the 601070 adjustable insert, the 600070 and 600071 inserts for the standard stamps, and the 900179S screwdriver set, which comes in a robust, compact case with roll-off protection and a rotatable cap.

If your tools are still running older date stamps, this is a good moment to upgrade them before the next date change comes round.

Gunther UK supplies the Knarr range across the UK and Ireland and can help you work out which latching stamps match the parts already in your tools. Get in touch with the team to talk it through or request a quote.

View the Knarr SALE 2026/27