The fire-resistant mortise door lock ES 981 is intended for use in fire-resistant doors. The faceplate is galvanised and rounded, allowing the mortise lock to be installed in a wide variety of fire doors. Both the latch and the bolt are metal so that they can withstand heat from a fire. The fire-resistant mortise lock also enables screw-on fittings and rosette fittings to be fitted easily because the holes in the lock are standardised according to DIN.