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Dsb8225L 85Mm Polished Chrome Extra Long Security Door Bolt
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Dsb8225L 85Mm Polished Chrome Extra Long Security Door Bolt
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| Delivery Time Frame | Delivery Information |
| Next Working Day By 1PM | When an order is placed by 3pm for next working day on certain items |
| Standard Delivery | Usually delivered in 2 to 4 working days |
| Delivery Charges | |
| UK Mainland | Prices start at £3.95 for very small items, £6.50 for small, £9.50 for medium and £20 for large/long items |
| Scottish Highlands & Islands, Northern Ireland & Ireland | Prices from £30, please see our delivery page for more info. |
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£7.88
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Description
Reinforce Vulnerable Timber Entry Points with Reliable Mortice Security
External timber doors present a unique physical vulnerability when standard mortice locks are left to handle forced entry attempts on their own. During extreme seasonal temperature swings, wooden entrance doors and patio leafs warp, shrink, and expand. This movement creates wider gaps around the frame edges, leaving standard throw bolts exposed or poorly engaged into the timber jamb. Modern intruders exploit these weak points with lever bars or physical kicks, focusing immense pressure on lone latch positions to splinter the surrounding wood.
The Dsb8225L 85Mm Polished Chrome Extra Long Security Door Bolt provides a robust secondary defense designed to overcome these structural variations. Engineered with an extended 85mm overall body length, this internal mortice security bolt drives deep into the door stile to ensure substantial engagement into the outer frame. By tucking invisibly inside the timber edge and operating via a splined star key mechanism, it resists tampering from outside while anchoring both the top and bottom corners of heavy wooden doorways.
Finished in reflective polished chrome, this security hardware complements contemporary handles and hardware suites across residential homes and commercial developments. Whether fitted into back doors, rebated French pairs, or vulnerable utility room access points, the Dsb8225L extra long security bolt brings reliable, discreet locking power that strengthens existing installations against lateral prying forces.
Key Operational and Architectural Features
Extended 85mm Mortice Body
The extended barrel length provides substantial mechanical purchase inside the timber. This design gives the internal mechanism greater stability under load, making it especially suitable for wider door profiles and doors subject to seasonal movement where smaller bolts fall short.
Concealed In-Frame Protection
Installed directly into the edge of the door leaf, the bolt body remains completely concealed when the door is closed. This mortice installation prevents intruders from accessing the securing fixings, hacksawing the bolt, or levering the hardware away from the surface.
Splined Star Key Operation
A dedicated splined security key operates the internal pinion drive, giving homeowners positive mechanical control over bolt extension. Because keys are supplied separately, you can easily control duplicate access and balance security management across multi-door properties.
Corrosion Resistant Polished Chrome
The durable polished chrome finish provides a mirror-like shine that matches modern chrome and stainless steel architectural ironmongery. The plating resists surface oxidation and tarnishing caused by humidity, wet weather, and routine cleaning.
Stage-by-Stage Execution Pipeline
Stage 1 - Marking and Core Bore Drilling
Determine the ideal mounting height on the internal face of the door, typically placed near the top and bottom corners. Mark the center point along the opening edge of the door leaf. Using an auger or flat wood bit matching the barrel diameter, bore straight into the stile to the required 85mm depth while keeping the drill level.
Stage 2 - Keyhole Access Preparation
Measure the exact backset distance from the front faceplate to the internal operating drive. Mark this position accurately on the inside face of the door leaf. Drill through from the internal side to create the keyway aperture, taking care not to splinter the timber as the bit exits into the main mortice channel.
Stage 3 - Faceplate Morticing and Fixings
Insert the bolt into the borehole and trace around the rectangular chrome faceplate with a sharp pencil or marking knife. Remove the unit and chisel away the timber until the faceplate sits perfectly flush with the door edge. Secure the bolt tightly using suitable wood screws.
Stage 4 - Strike Plate Alignment and Testing
Coat the tip of the bolt with chalk or pencil, close the door, and turn the splined key to mark the frame. Mortice the matching chrome strike plate into the door frame at this exact contact mark. Operate the mechanism several times to ensure fluid throwing action without binding or friction.
Detailed Specifications
| Specification | Rating or Standard | Practical Details |
|---|---|---|
| Product Code | DSB8225L | Official Doorfit hardware catalogue identifier for rapid inventory reference. |
| Overall Body Length | 85mm Dimension | Extra long case size delivers deep anchor purchase into door frames. |
| Material Construction | Steel and Zinc Alloy | High tensile core engineered to resist vertical shear and dynamic levering loads. |
| Surface Plating | Polished Chrome | Reflective mirror finish that matches bright architectural door furniture suites. |
| Installation Style | Concealed Mortice | Sits fully recessed within the timber edge for clean, unobtrusive security. |
| Key Configuration | Splined Star Pattern | Keys supplied separately to facilitate site-specific access management strategies. |
| Substrate Compatibility | Solid Timber Construction | Suitable for external residential doors, French patio doors, and utility exits. |
Professional Fitting and Maintenance Guidance
To ensure long lasting security, installers should fit mortice security bolts in pairs on high risk external doorways. Installing one bolt roughly 150mm from the top corner and a second bolt 150mm from the bottom corner binds the entire height of the door leaf against the frame. This dual setup distributes lateral pressure evenly across the door structure, preventing intruders from bowing the door leaf outward.
When fitting the bolt into French doors or double doors, install the bolt vertically into the top head jamb and bottom floor sill of the passive door leaf. This arrangement creates rigid anchor points that lock the slave door in place, giving the active master leaf a firm locking point for its main latch.
Routine maintenance requires very little effort. We suggest lightly lubricating the internal drive gear once a year with a dry PTFE or graphite spray. Avoid using thick greases or liquid oils, as these collect sawdust, airborne grit, and dirt, which can stiffen the gear mechanism over time. Wipe the polished chrome faceplate occasionally with a soft, dry cloth to keep it clean and shining.
Need Assistance with Your Architectural Ironmongery?
Our technical ironmongery team is on hand to help you choose matching security keys, choose complementary escutcheons, or plan multi-door specifications for upcoming projects.
Contact Our TeamSpecification
| Manufacturer | Carlisle Brass |
|---|---|
| Finish | Polished Chrome |