The 609mm Lever Action Flush Bolt is an industrial-strength architectural security component designed specifically for extra-tall doors, grand entrances, and high-ceilinged spaces. Measuring 609mm (24 inches) in length, 609mm Lever Action Flush Bolt is one of the most substantial flush bolts available, providing exceptional structural stability and an extended reach essential for doors exceeding 2.7m (9ft) or 3m (10ft) in height.

This 609mm Lever Action Flush Bolt is designed to be fully recessed (morticed) into the edge or face of a door, sitting perfectly flush with the timber to maintain clean, uninterrupted architectural lines. Its primary function is to secure the “slave leaf” of a pair of double doors, providing a rock-solid foundation for the active door to lock into.

Forged for maximum structural integrity, these bolts feature a precision-machined internal mechanism that ensures a smooth, positive “click” when engaged.

Feature	Detailed Specification
Total Length	609mm (24 Inches)
Body Width	20mm – 25mm (Slimline for modern door stiles)
Mechanism	Lever Action (Integrated high-leverage pivot)
Bolt Throw	20mm – 35mm (Extra-deep vertical engagement)
Material	Solid Forged Brass or Grade 304 Stainless Steel
Fixing Type	Fully Recessed / Mortice (Invisible when closed)
Included Accessories	Color-matched strike plate and high-tensile screws
Available Finishes	Satin Stainless Steel, Polished Brass, Matte Black, Satin Nickel

Design & Security Advantages

Optimized Reach for Oversized Doors: On 3-meter tall doors, a standard-length bolt is physically unreachable without a ladder. The 609mm length brings the operating lever down to a natural, comfortable height (approximately chest level), allowing for effortless operation of the top bolt.
Maximum Structural Anchor: The 24-inch body allows for fixing points to be spread across a significant portion of the door stile. This creates an immense “lever-arm” effect, preventing heavy timber or metal doors from bowing, vibrating, or rattling under extreme wind pressure or forced entry attempts.
High-Leverage Pivot Mechanism: The integrated flip-lever provides superior mechanical advantage. This allows the bolt to be engaged or retracted with minimal effort, even against the resistance of high-performance acoustic or heavy-duty weather seals.
Seamless Aesthetic Integrity: Despite its industrial size, the hardware is morticed deep into the door edge. It remains completely hidden when the doors are closed, preserving the premium look of custom timber doors while offering commercial-grade security.

Primary Applications

Grand Entrance Double Doors: The standard specification for oversized front or rear double doors in luxury residential estates and manor houses.
Tall Internal French Doors: The ideal choice for “Grand Room” or ballroom entrances where standard-length bolts would look disproportionately small or be functionally unreachable.
Commercial & Industrial Partitions: Frequently specified for conference centers, theater doors, or schools where large double doors require a secure, heavy-duty locking point.
Acoustic & Fire-Rated Doors: Provides the necessary vertical pressure to keep heavy, specialized doors tightly compressed against their frame seals to maintain fire or sound ratings.

Professional Installation Tip: Precision and Alignment

With a bolt of this length (609mm), the accuracy of the mortice and the alignment of the strike plate are critical to prevent mechanical binding.

The “Top and Bottom” Pair: For any door over 2.4m, always install these in pairs—one at the top shooting into the head frame and one at the bottom shooting into the floor. This prevents the door from warping over time due to its own weight.
Specify a Dust-Proof Floor Socket: For the bottom 609mm bolt, a spring-loaded dust-proof floor socket is essential. Because the 609mm Lever Action Flush Bolt is heavy and the throw is deep, debris in a standard floor hole will prevent the bolt from locking fully, compromising security.
Mortice Depth Consistency: Ensure the mortice for the 609mm body is perfectly consistent in depth along its entire length. If the timber is uneven, the long metal body can “flex” when the screws are tightened, which may cause the lever mechanism to stick.
Pilot Holes in Hardwood: These 609mm Lever Action Flush Bolt are often fitted into premium hardwoods like Oak or Walnut. Always drill deep, straight pilot holes for the fixing screws to prevent the door stile from splitting near the leading edge.

This 20 x 609mm Lever Action Flush Bolt with radius forends is designed for strength, durability, and smooth operation. Perfect for securing the inactive leaf of double doors, 609mm Lever Action Flush Bolt provides reliable fastening by locking the door securely into the frame or floor. The lever action makes the bolt easy to use, allowing it to slide firmly into position with a simple hand movement. The longer 609mm size offers extra holding power and stability, making 609mm Lever Action Flush Bolt ideal for larger or heavier doors that need strong support.

With its radius forends, this 609mm Lever Action Flush Bolt provides a neat finish, ensuring it sits cleanly within the door edge without sharp corners. Because it fits flush, it keeps a tidy appearance and eliminates protruding parts, improving both safety and style. Built from durable materials, it is strong enough for regular use in homes, offices, or commercial spaces. Installation is straightforward, and once in place, it needs little upkeep while continuing to perform effectively over time. Combining strength, ease of use, and a clean design, this 609mm Lever Action Flush Bolt is a reliable choice for long-lasting door security.