QS4451/1 Box Type Flush Bolt – 203 mm Stainless Steel
The QS4451/1 Box Type Flush Bolt from QS Doorware is a concealed, surface-recessed door bolt engineered for timber doors where a clean, unobtrusive finish is essential. At 203 × 19 mm, it sits flush within a routed housing in the door edge, keeping the face of the door completely hardware-free while providing reliable top-and-bottom security for double doors, French doors, and inactive door leaves.
Product Specifications
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SKU: QS4451/1
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Type: Box type flush bolt (concealed)
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Dimensions: 203 × 19 mm
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Material: Stainless steel
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Application: Timber doors — double doors, French doors, inactive leaf
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Lead time: 3–4 business days
Why Choose the QS4451/1?
Unlike surface-mounted barrel bolts, the box type flush bolt is morticed into the door edge, making it virtually invisible when the door is open. This makes it the preferred choice for architects and interior designers who want security without compromising the clean lines of a door. The stainless steel construction ensures long-term durability and corrosion resistance in both interior and sheltered exterior applications.
Frequently Asked Questions
What is a box type flush bolt?
A box type flush bolt is a concealed door bolt that is recessed (morticed) into the edge of a door. When installed, only the finger pull is visible, giving the door a clean, hardware-free appearance on the face.
What is the difference between a flush bolt and a barrel bolt?
A barrel bolt is surface-mounted and visible on the face of the door. A flush bolt is morticed into the door edge and sits flush, making it far less visible and more aesthetically refined.
What size is the QS4451/1?
The QS4451/1 measures 203 × 19 mm, making it suitable for standard timber door edges.
What doors is this flush bolt suitable for?
It is ideal for double doors, French doors, and inactive door leaves where one door needs to be secured to the frame at the top and bottom without a visible bolt on the door face.
Is this bolt suitable for exterior use?
The stainless steel construction offers good corrosion resistance, but this bolt is primarily designed for interior or sheltered exterior applications. Contact our team for advice on fully exposed exterior installations.
Does installation require routing the door edge?
Yes — a box type flush bolt requires a routed housing (mortice) in the door edge and a corresponding strike in the frame or floor. Professional installation is recommended.
What is the lead time for this product?
The QS4451/1 ships within 3–4 business days from our warehouse.
Is this product available in other sizes?
QS Doorware offers flush bolts in multiple sizes. Browse our Door Bolts range on this product page or contact Doors Direct for assistance finding the right size for your project.
