Door Hardware - Mortise Bolt Sets

Mortise bolt sets: how the bolt hides inside the door

Mortise bolt sets throw a bolt from inside a channel routed along a door's edge, leaving nothing but a slim strike and a small turn knob visible once the work wraps up, unlike a surface bolt whose entire body stands proud of the wood. Rocky Mountain sells this group as round, square, and unadorned rectangular versions, each driving one identical internal mechanism no matter which shape covers it.

Shape follows the neighboring hardware

Since the mechanism never changes between versions, the real decision is visual: a round option echoes rosettes already installed on that door's levers, a squared edge suits a more angular set nearby, and a bare option with no ornament at all keeps the bolt quiet next to a more decorative handle. None of these choices affect how firmly the bolt seats or how smoothly it turns.

Getting the footprint right

Two closely related footprints ship within this group, separated by just a sliver of extra height, so take a precise measurement of any existing routed opening before ordering. A wrong footprint here generally means sending the piece back for an exchange, not trimming it down to fit on site.

Buy two, not one

Holding an inactive leaf steady typically takes a pair of these bolts, mounted high and low along one edge, so that leaf stays put while the working side swings shut against it. Choose a matching pair over a single unit, and confirm both mounting heights land within easy reach once installed, the upper one especially. Every version here operates by hand, a simple quarter turn, with no key needed from inside the room. Check that the turn knob itself clears any hardware mounted close by, a nearby door pull especially, since a knob crowded against another fixture is awkward to operate one-handed once everything's installed.