UK Suppliers Of Sunflex Bi-Fold Gearbox

The Sunflex Bi-Fold Gearbox (SF02) is a heavy-duty, primary drive mechanism designed for use in high-performance aluminium bi-folding door systems. Engineered for durability and precision, this lever-operated gearbox acts as the central hub for the door’s locking operation. It is most commonly found in Sunflex door profiles where a robust, reliable handle-driven action is required to engage top and bottom shootbolts via internal drive rods. What sets the SF02 apart is its innovative modular design. Rather than being a fixed-length unit, this gearbox is designed to be fully expandable. It features dedicated connection points that allow it to link directly with additional components, such as the Sunflex Gearbox Cylinder Module (SF01), to form one continuous, integrated locking strip. This modularity makes it a highly versatile solution for trade professionals and DIYers alike, allowing for the easy addition of Euro profile cylinder locking points to existing door configurations without replacing the entire mechanism.

Features Primary lever-operated drive unit for Sunflex bi-fold systems Modular connectivity: Interlocks with secondary modules to create a continuous gearbox Designed for use with internal drive rods and shootbolts Non-handed design for universal application on left or right-hand doors High-grade metal construction with protective zinc plating Smooth, low-friction mechanical action for effortless handle operation Specifications 7 mm spindle not included Handle turns downward to lock Dimensions Length: 184 mm Width: 17 mm Depth: 23 mm Handle screw hole distance (centre to centre): 43 mm FAQs Is the SF02 gearbox handed? No, the Sunflex SF02 gearbox is non-handed and can be installed on both left and right-hand opening bi-fold door leaves. Can I add a key lock to this gearbox later? Yes. Because the SF02 is a modular part, you can purchase a Sunflex Gearbox Cylinder Module at any time. The two parts link together physically to form a single unit that accommodates a Euro cylinder. How do I know if this is the correct gearbox for my door? This part is a genuine replacement for Sunflex systems. You can identify it by the specific shape of the casing and the ‘SF02’ designation typically associated with this Sunflex bi-fold series. Does this unit include the handle or drive rods? This product is the gearbox module only. Handles, drive rods, and additional cylinder modules are sold separately as part of the modular system. Why is my current gearbox failing? Over time, the internal gears of bi-fold locks can wear due to door misalignment or lack of lubrication. Replacing the SF02 unit restores the smooth mechanical connection between the handle and the shootbolts. Share on Twitter Share on Facebook Pin this product Share via email