A new self-locking wedge clamp for safely securing dies on power presses and injection moulding machines, without the need for a permanent hydraulic supply, has been introduced by Hitchin-based Roemheld UK Ltd (www.roemheld.co.uk).

Designed to clamp dies with straight edges, the clamping element uses spring force for retention; a pressure of up to 160 bar is sufficient for release, and this can be provided by the machine hydraulics.

Inclined at 6deg, the clamping bolt approaches the die edge from the side, resulting in a self-locking connection, after which a spring applies frictional force. Inductive and optical ‘position control’ ensure operational safety.


The robust, compact wedge clamp is coated to inhibit rusting and can withstand harsh environments — including dirt and temperatures up to 160°C — for high levels of functional safety in the most challenging of production processes.

The tolerance for clamping edge height is ±0.5mm, with spacer plates compensating for any deviation.

Cylinder diameters are between 35 and 85mm, and the operating forces range from 25 to 120kN, depending on the unit size.

In the standard range, the availability of four hydraulic connection variants provides flexibility for different assembly configurations, while modified wedge clamps can be supplied to suit customers’ specific applications.

Additional versions are available for clamping on angled die edges, with permanent lubrication or multi-layer coating to improve wear properties.

All clamping elements comply with the Euromap Directives.