Emtek 83225 Steel Understrike for Deadbolt

The 83225 is a deadbolt understrike, a steel plate that goes into the jamb mortise underneath the finish strike plate. The visible decorative strike screws over it, and the understrike takes the load so the bolt is throwing into steel rather than bare jamb wood. It is a replacement part for an Emtek deadbolt, not a lock in itself, so it does not come keyed or with a cylinder.

Both. The 83225 covers deadbolts at either 2-3/8 or 2-3/4 inch backset. The understrike mounts in the jamb, so backset only tells you where the bolt lands across the door edge, not what the strike side needs. There is one part number to order either way.

An understrike will not fix alignment. It reinforces the mortise, it does not move where the bolt lands. For an opening that has settled or a door that sags, an adjustable strike is the part that solves it: the Kwikset 80318 full round adjustable strike or the Kwikset 81825 six-way adjustable deadlatch give you movement at the jamb. Use the 83225 once the geometry is right and you want the jamb reinforced.

The Emtek 83225 is a steel understrike for a deadbolt - the reinforcing plate that sits behind the finish strike rather than the piece you see. If the job needs a visible deadbolt strike plate on the jamb, the Deltana SP2753 is a steel deadbolt strike plate measuring 2-3/4 inches by 1-1/4 inches. The two are not alternatives to each other so much as different layers of the same strike prep, and a jamb can carry both.

The Emtek 83225 is a residential deadbolt understrike sized to a tubular lock prep. Commercial jambs are commonly prepped for an ASA strike, and the Codelocks ASA strike plate in stainless steel is built to that standard prep. If the drawing calls out ASA, the ASA strike plate is the part that matches the cutout; the 83225 suits residential tubular deadbolt prep.

1-3/8 to 2 inches, which covers standard 1-3/4 inch commercial-weight doors and the thinner 1-3/8 inch interior doors common in older residential stock. It is a residential-line part, so it is sized for the Emtek tubular deadbolt range rather than heavy institutional openings.

A 2-1/8 inch cross bore through the face of the door and a 1 inch edge bore for the bolt. That is the standard tubular prep, so if you are swapping onto a door already drilled for a residential deadbolt the holes usually line up without redrilling. The jamb is the side that needs attention, since the understrike sits in a mortise behind the strike.

No. It is a residential tubular deadbolt part, cut for a wood jamb mortise. Commercial metal frames take an ASA prep instead, and for that a Codelocks ASA strike plate in stainless is the strike-side part to look at. Property managers standardizing across a mixed building will need both kinds on the truck.

The Emtek 83225 is a flat steel understrike - a plate for the deadbolt strike prep, not an enclosure. The cavity behind the strike is a separate piece: the Kwikset 81640 strike box and the Kwikset 81231-001 metal strike dust box are both deadbolt strike hardware that line the bolt pocket. On a full deadbolt strike prep the plate and the box do different jobs, so specifying one does not cover the other.

Both are steel and both belong to a deadbolt strike prep. The Emtek 83225 is the understrike, the reinforcing plate that goes in first and is covered once the assembly is complete. The Deltana SP2753 is a deadbolt strike plate at 2-3/4 inches by 1-1/4 inches, a stated face size for the visible plate. Where the difference shows up on an order is that the SP2753 has a face dimension to match the jamb cutout and the 83225 backs it up.

The Emtek 83225 is built around a deadbolt, so it belongs on the deadbolt bore rather than the latch bore. For a latch that needs a strike, the Kwikset 81825 6 way adjustable deadlatch is the deadlatch-side part. Deadbolt strike hardware and latch strike hardware sit at different heights on the same jamb and are prepped separately.

One version only, in steel. That is not a limitation for most installs, since the understrike is hidden behind the finish strike plate once the job is done. Match your finish on the visible strike, not here.

Where the preps are cut clean and consistent, a fixed steel understrike such as the Emtek 83225 reinforces the deadbolt prep the same way on every door. Where they vary door to door, the adjustable Kwikset 80318 full round adjustable strike accommodates the bolt landing without a new cutout, and the Kwikset 81640 strike box handles the pocket. Buildings with a mix often carry the fixed plate as the standard and the adjustable strike for the outliers.