Commercial Door Flush Bolt (Flashbolt) Locking System

Top & Bottom Locking for Maximum Door Security

A commercial door flush bolt (also called flashbolt) is a locking system installed inside the edge of the door, typically used on double doors in commercial properties. The flush bolt secures the inactive door leaf by locking it into the frame at the top and into the floor at the bottom.

This system is commonly found in:

  • Office buildings

  • Retail stores

  • Schools & institutions

  • Warehouses

  • Commercial entrances with double doors

When properly installed and maintained, a flush bolt adds stability, alignment, and security to the door system.

How a Commercial Flush Bolt Works

  • The bolt is hidden inside the door edge (flush-mounted)

  • When engaged, the top bolt extends into the door frame

  • The bottom bolt extends into the floor strike

  • The active door then locks against the secured inactive door

This prevents door movement, misalignment, and forced entry.

Signs It’s Time to Replace a Commercial Flush Bolt

Flush bolts wear out over time, especially in high-traffic commercial environments. You should consider replacement if you notice:

  • Door no longer lines up properly

  • Top or bottom bolt does not fully extend

  • Door rattles or moves when closed

  • Bolt is bent, jammed, or broken

  • Floor strike is damaged or misaligned

  • Door is hard to lock or unlock

  • Security inspection or fire inspection failure

⚠️ A faulty flush bolt can cause door sagging, frame damage, and security risks if ignored.

Why Replacing a Worn Flush Bolt Matters

  • Restores proper door alignment

  • Improves security against forced entry

  • Prevents damage to hinges and door frame

  • Ensures compliance with commercial safety standards

  • Reduces daily wear on the active door lock

Replacing the flush bolt early often prevents much more expensive door repairs later.

Professional Commercial Flush Bolt Replacement

Commercial doors require precision installation. Improper sizing, incorrect bolt length, or misaligned strikes can cause constant issues.

At Serrurier Shay Locksmith, we:

  • Diagnose top & bottom bolt issues

  • Replace worn or outdated flush bolt systems

  • Adjust door alignment and floor strikes

  • Work on aluminum, steel, and wood commercial doors

  • Service offices, stores, schools, and buildings across Montréal

Contact Serrurier Shay Locksmith – Commercial Door Experts

📞 Phone: 514-836-9097
📧 Email: info@serruriermontreal.com

Reliable. Professional. Commercial door specialists you can trust.