Bullet and Roller Shutter Locks

Bullet & Roller Shutter Locks

A roller shutter without a proper lock is really just a physical barrier — it keeps the weather out and discourages casual interference, but it won't hold against anyone who's decided to get through it. The locking hardware is what turns a shutter into a genuinely secured door, and getting the right type for the application matters more here than in most lock categories, because the wrong choice often means the lock simply won't fit or won't work with the shutter geometry you're dealing with.

Roller shutter door locks work by shooting locking arms out horizontally into channels on either side of the shutter curtain when the lock is engaged. Central locks do this symmetrically from the middle of the door — the CISA 41320 and the ILS Prefer central roller shutter lock are both well-regarded examples, with the ILS range offering euro cylinder variants that allow the cylinder to be changed independently if rekeying is needed later. Side-mounted options like the CISA 41110 and 41420 suit shutters where a central fixing isn't practical, and Asec produces both left and right-handed versions for exactly this reason. The ILS ground locking roller shutter lock adds a floor bolt element for applications where the bottom of the curtain also needs securing — on wider industrial shutters particularly, that bottom edge can be vulnerable to lifting without it.

Bullet locks cover a different application. Round or oval in profile, they're fitted directly into the shutter curtain or lath and engage with a keep when the shutter is down. They're commonly used on commercial shop fronts and retail shutters where the locking point needs to be discreet or where the shutter construction doesn't suit a full door lock body. Housings are available where the curtain material needs a reinforced mounting point, and keyed alike options mean a single key can operate multiple locks across the same premises — useful on units with more than one shutter or where staff key management is a consideration.

The Bulldog GR500 sits across both worlds — a shutter door lock finished in yellow, built with the same visible-deterrent logic as the rest of the Bulldog range, and suited to both commercial premises and residential roller garage doors.

Getting the mounting position and size right before ordering is worth taking seriously. Central versus side mounting, the curtain thickness, whether you need inside-only or dual-sided operation — these details determine which product actually fits. If you're replacing an existing lock, the make and model of the shutter itself is a useful starting point.