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The PRIME-LINE MP9401 is a door lock reinforcer designed to strengthen the area around a door lock and latch assembly. It provides a hardened mounting point that resists kick-in and forced-entry damage at the lock strike zone. This type of hardware is installed directly to the door edge and face, surrounding the existing lock cylinder or latch bore. Carpenters, finish contractors, locksmiths, and security-conscious property managers install this component during new door prep or as a retrofit upgrade to an existing door assembly.
The MP9401 is suited for residential and light commercial door applications where the lock area needs reinforcement against impact stress. It fits over the existing lockset bore and fastens to the door face to distribute force across a wider surface area. This product is sold as a single unit and is appropriate for standard door security improvement projects.
Designed as an OEM-style replacement and retrofit reinforcer for standard residential and light commercial doors with conventional lock bore preparations.
Installation is typically performed by a locksmith, finish carpenter, or general contractor. Before beginning, ensure the door is fully closed and the lockset is removed or backed out to allow proper seating of the reinforcer plate. Fasten securely according to the hardware instructions using the provided or specified fasteners. Verify door operation and latch alignment after installation before returning the door to service.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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