Description The GU A3 Secury LogIQ 45mm 4 Deadbolt 20mm Radius End Faceplate Automatic Slam Multipoint Door Lock is specified when a high lock case automatic mechanism needs to be replaced with matching dimensions. Manufactured by Gu Ferco, it uses a euro cylinder lock type and combines a latch and deadbolt within a high-positioned central gearbox. The automatic slam function activates the locking points the moment the door shuts. This removes the need to lift the lever before turning the key. Its 20mm radius end faceplate allows the strip to follow the routed edge found on many composite and timber doors. The rounded ends provide a consistent transition into the door profile. The slim 20mm faceplate keeps the edge appearance neat across the full 1770mm length. The high lock box position alters handle placement compared to centre-case systems and must match the existing cut-out. Four additional deadbolts are positioned along the strip to deliver multiple engagement points from top to bottom. The top deadbolt sits 310mm from the centre, while the bottom deadbolt is positioned 1280mm from the centre, creating a 1590mm span between the outer locking points. This spacing spreads pressure evenly against the frame when the automatic mechanism engages. The lock operates with a 45mm backset and 92mm PZ centres, and it uses a single spindle for lever handle control. It is non-extendable to ensure fixed alignment once installed. Routine lubrication with a light application of GT85 to the gearbox and moving components helps maintain smooth automatic engagement and reduces wear. Grease-based sprays should be avoided as they attract debris and can affect internal movement. When replacing the mechanism, upgrading to a 3 star high security euro cylinder improves resistance against snapping and picking. Replacing the door handles at the same time ensures correct spindle engagement and refreshes the overall finish.
