A 200mm Flush Bolt is a heavy-duty architectural component designed to be morticed into the edge or the face of a door. Its primary function is to secure the “slave leaf” (the inactive door) of a pair of double doors or French doors. By anchoring one door firmly into the frame or floor, it creates a solid post for the “active leaf” to lock into, ensuring a secure and stable closure.

At 200mm (8 inches) in length, this 200mm Flush Bolt offers a significant mechanical advantage and deeper engagement than smaller domestic versions. It is the professional standard for full-height timber, composite, and aluminum doors where both structural strength and a seamless, “flush” aesthetic are required.

Technical Specifications of 200mm Flush Bolt

These bolts are precision-engineered to provide a smooth, tactile “flick” action and a secure, rattle-free fit once the bolt is engaged.

Feature	Detailed Specification
Total Length	200mm (8 Inches)
Body Width	20mm – 25mm (Slimline profile for door edges)
Mechanism	Lever Action (Integrated flip-lever operation)
Bolt Throw	15mm – 25mm (Vertical engagement depth)
Material	Solid Forged Brass, Zinc Alloy, or Grade 304 Stainless Steel
Fixing Type	Recessed / Mortice (Sits level with the door surface)
Included Accessories	Matching strike plate and high-tensile wood screws
Available Finishes	Satin Chrome, Polished Brass, Matte Black, Satin Nickel, Antique Bronze

Design & Security Advantages

Zero-Profile Integration: Because the bolt is recessed into a prepared mortice, it sits perfectly flush with the door timber. This prevents snagging on clothing or jewelry as people pass through the doorway and maintains the clean, uninterrupted lines of the door’s edge.
High-Leverage Operation: The integrated flip-lever acts as a mechanical pivot, allowing for effortless engagement and retraction. Unlike traditional “slide bolts” that can become stiff or difficult to grip with cold hands, the lever action provides a smooth, low-friction user experience.
Enhanced Structural Stability: On tall or heavy double doors, the 200mm length allows the fixing screws to be spread further apart. This distributes the physical load across more of the door’s grain, significantly increasing the assembly’s resistance to forced entry, warping, or wind pressure.
Invisible Security: When the doors are closed and the active leaf is latched, the flush bolt hardware is completely concealed. This provides high-level security without compromising the interior design or “cluttering” the door face with visible sliding bolts.

Primary Applications

Internal French & Double Doors: The essential hardware for securing the secondary leaf of double doors leading into lounges, dining rooms, or home offices.
External Patio & Folding Doors: Used at the top and bottom of the slave leaf to provide weather-tight compression against the frame seals and enhanced security against intruders.
Oversized Cupboards & Wardrobes: Ideal for large-scale storage or utility room doors where a standard magnetic catch is insufficient to keep the doors perfectly aligned and flush.
Commercial Office Partitions: Frequently specified for meeting rooms or hotel ballrooms with folding timber partitions to provide a professional, hidden locking solution.

Professional Installation Tip: Precision Morticing

Because a flush bolt is recessed, the quality of the “cutout” determines the long-term reliability of the hardware.

The “Top and Bottom” Rule: For maximum security and to prevent the door from “bowing” at one end, always install flush bolts in pairs—one at the top of the door (shooting into the head frame) and one at the bottom (shooting into the floor).
Use a Dust-Proof Floor Socket: For the bottom bolt, we highly recommend installing a spring-loaded dust-proof socket. This prevents grit, dust, and pet hair from filling the hole in the floor, ensuring the bolt can always achieve its full 20mm throw and a secure lock.
Pilot Holes for Slim Stiles: Flush bolts are often installed in the narrow leading edge of a door. Always drill pilot holes for your fixing screws to prevent the timber from splitting, which is a common failure point on the edge of high-quality doors.
Clearance & Depth: Before final assembly, ensure the mortice is deep enough so that the lever can “flip” past the 180° mark. If the cutout is too shallow, the lever may protrude slightly, preventing the doors from closing together tightly.

This 20 x 200mm Flush Bolt with radius forends is designed for strength, reliability, and ease of use. 200mm Flush Bolt is ideal for securing the inactive leaf of double doors or any door that requires extra fastening. The lever handle makes operation smooth and effortless, allowing the bolt to slide securely into position with a simple movement. The radius forends provide a neat and professional finish, ensuring the 200mm Flush Bolt fits neatly into the door edge while maintaining a clean appearance.

Built with durability in mind, this 200mm Flush Bolt is strong enough to handle daily use in both residential and commercial settings. Because it sits flush within the door, it avoids protruding parts and delivers a safe, tidy, and discreet design. Installation is straightforward, and once fitted, the 200mm Flush Bolt requires little maintenance while continuing to perform effectively over time. Its longer 200mm size adds stability and security, helping to keep doors aligned and firmly held in place. Functional, neat, and dependable, this 200mm Flush Bolt is a practical addition to any door security setup.