Service Details

Sliding espag (7.5 BS)

The term "Sliding Espag" refers to an Espagnolette locking system specifically engineered for sliding applications, typically found in uPVC (unplasticized polyvinyl chloride), aluminum, and even timber frames. The designation "15 BS" is a crucial technical specification, signifying a 15 mm Backset (BS). The backset is the measurement from the edge of the faceplate to the center of the spindle or keyhole, making the 15 mm backset a common standard, particularly for uPVC and certain sliding door systems.

Core Mechanism and Operation

An Espagnolette lock is a multi-point locking mechanism. Unlike older single-point locks that secure a window or door at only one central location, the sliding espag utilizes a long metal strip, or rod, that runs vertically along the sash's edge. This rod is equipped with multiple locking points, often mushroom-shaped cams or bolts, distributed along its length.

The operation is simple and unified:

Handle Turn: A single turn of a sliding door or window handle engages a gearbox positioned centrally on the rod.

Simultaneous Engagement: The gearbox drives the entire rod, causing all the dispersed locking points—two, three, or even four, depending on the length—to simultaneously extend and securely latch into corresponding "keeps" (or strikers) fixed to the fixed frame.

Enhanced Security: This simultaneous, multi-point engagement ensures the sliding panel is secured at the top, bottom, and middle points, creating a high-security barrier against forced entry attempts.

Key Features of the 15 BS Sliding Espag

The 15 mm backset variant is popular due to its compatibility with a wide range of sliding profile systems. Its key features and benefits include:

Multi-Point Locking Superior security by securing the sash at multiple points, making it significantly harder to pry open.

15 mm Backset A standard dimension that ensures compatibility with specific profiles, predominantly sliding uPVC doors and large windows.

Weather Sealing The force of the multi-point lock pulls the sash tightly against the frame's gasket, creating an excellent seal against drafts, rain, and dust. This enhances thermal insulation and energy efficiency.