Deltana CF450 Window Lock, Casement Fastener, Reversible, 4-1/2"

The CF450 is a casement window lock, a surface-mounted fastener that draws a casement sash tight against the frame and holds it shut. It is a manual latch, not a hinge or operator, so it handles the securing side of the opening only. Solid brass throughout, 4-1/2 inches, sold each.

No. The CF450 is reversible, so one part covers both hands. For a property manager doing a run of casements, or a contractor stocking a job cart, that means a single line item rather than a handed split, and no chance of the wrong hand showing up at the opening.

No. A casement fastener like the CF450 is for a side-hinged sash that swings in or out, and it works by pulling that sash against the frame. A double hung window needs a sash lock that draws two meeting rails together, and a slider needs a sliding sash latch. Buying the CF450 for either of those is a return.

The CF450 measures 4-1/2 inches, so the stile or sash face it mounts to has to carry that length clear of the glazing bead and the frame stop. Hold the part up to the opening before boring: on narrow wood casement stiles the handle sweep is what usually runs out of room first, not the mounting footprint.

Solid brass, both the material and the substrate. That matters on exterior-facing casements and in coastal or high-humidity buildings, where a plated pot metal fastener corrodes through at the pivot and a brass one does not. It is also why the finish list runs to plated and PVD options rather than paint alone.

Nine: PVD Polished Brass, Polished Brass, Antique Brass, Oil Rubbed Bronze, Brushed Nickel, Antique Nickel, Polished Chrome, Brushed Chrome, and Paint Black. If you are matching existing hardware across a building, PVD Polished Brass is the one to specify where the fastener sees sun or weather, since PVD holds its color where standard lacquered polished brass will eventually go.

One. The unit of measure is each, and pricing shown is per unit, so a building with 40 casements is 40 lines of quantity, not 20 pairs. Worth checking before a bulk order goes in.

The CF450 is the 4-1/2 inch length in Deltana's casement fastener line. On tight sash stiles or where the handle would foul a mullion, look for the shorter Deltana casement fastener size in the same finish family so the run still matches visually. Measure the clear face of the stile first, then pick the length that fits inside it.