The lock is rarely the part that breaks
The usual reaction to a break-in scare is to buy a stronger deadbolt. It feels logical, and it is often the wrong first move. Kick-in testing points somewhere else: the strike plate and the wood holding it.
Consumer Reports tests this directly. Its kick-in rig swings a 100-pound steel battering ram at a door section, then repeats the blow eight times. At least half of the locks tested fail, and those are retested with a reinforced box strike.
The gap is striking. In a 2017 round, only six of almost two dozen locks resisted repeated impacts with the hardware in the box. With a box strike and longer screws, every model became especially resistant to kick-ins. That is the whole case for deadbolt strike plate reinforcement in two sentences.
Why kick-ins split the jamb
The bolt locks into a pocket in the door jamb, the board that lines the door opening. The strike plate covers that pocket and is held on by two screws. Behind the jamb is usually a small gap, then the wall studs that actually hold the house up.
Consumer Reports found that many locks ship with short screws that catch only the jamb and never reach the framing. Screws 1 inch or shorter, it notes, make forcing the door easier. On a kick, the bolt pushes the strike, the screws hold only a thin board, and that board splits along its grain.
Text version of this diagram
Panel 1, typical: the strike plate is held by short screws that end inside the thin jamb board. A kick on the door levers the bolt against the plate and cracks the jamb.
Panel 2, reinforced: 3 inch screws pass through the strike, the jamb and the gap behind it, and bite into the wall studs, so the force of a kick goes into the house framing.
The lab tells the same story from the other side. BHMA's residential deadbolt standard includes a test that puts 1,350 pounds of force on the door against the bolt. Yet BHMA itself notes that field results can differ with installation and with the door and frame. A well-rated lock in a weak jamb is still a weak door.
Deadbolt strike plate reinforcement options, smallest to largest
Not every door needs the full treatment. At Deadbolt Fixers, we match the fix to what we find behind the trim.
| Upgrade | What it does | When we reach for it |
|---|---|---|
| 3 inch strike screws | Carry the strike's load into the studs | Every door where solid wood sits behind the jamb |
| Heavy-duty box strike | Lines the bolt pocket with metal and takes longer screws | Main entries, and any door with a worn or chewed-out pocket |
| Integrated strike reinforcer | Comes with some locks, such as Schlage's B60, already set up for 3 inch screws | When the lock you have or are buying includes one |
| Jamb reinforcement kit | A long metal plate spreads a kick along the frame | Jambs that have split before or are visibly thin |
| Door-edge wrap | Supports the door wood around the lock holes | Doors cracked at the bore or with a damaged edge |
| 3 inch hinge screws | Anchor the hinge side to the framing | Every exterior door we reinforce |
Consumer Reports' own retest setup is a useful benchmark: a box strike held with four 2-inch screws. For the screws, it recommends 3 inches, and it puts the cost of a box strike with 3-inch screws at as little as $5.
The hinge side counts too
A door has two edges, and a kick loads both. Once the lock side is anchored into the studs, the hinge screws become the shortest path for the force to escape.
Consumer Reports recommends 3-inch screws for the hinges as well. We usually start with one long screw per hinge and check the door still swings and closes cleanly before doing the rest.
Signs a door needs deadbolt strike plate reinforcement
Some doors make the case on their own. Check yours for these before deciding whether this is a weekend upgrade or a priority.
Reinforce soon if you see
- Strike screws about 1 inch long
- A loose strike plate, or screw holes that spin without tightening
- A crack in the jamb running up or down from the strike
- A jamb that was forced before and only patched or glued
- A bare wood bolt pocket that is chewed or shallower than 1 inch
- Short hinge screws on a door that has started to sag
If the door was actually forced, look at the lock as well. A bent bolt or a cracked housing means the hardware needs replacing along with the strike, not just new screws.
The parts themselves are cheap, as Consumer Reports' $5 figure shows. Labor depends on the frame: swapping screws is quick, while a split jamb takes longer to repair properly. Typical national figures for deadbolt work, which vary by location, are collected in our deadbolt cost guide.
How we reinforce without throwing off the door
Long screws are powerful enough to move a jamb. Done carelessly, deadbolt strike plate reinforcement can leave you with a door that is strong but hard to lock.
-
Check what is behind the jamb
Long screws only help where there is solid wood to anchor into. We confirm that before choosing hardware.
-
Prepare the pocket
The bolt pocket is opened to at least 1 inch deep and squared up so a box strike seats flush.
-
Drill pilot holes
Pilot holes keep long screws running straight and stop the jamb from splitting as they go in.
-
Snug, do not crank
Each screw goes in until the plate is tight. Overdriving pulls the jamb into the gap behind it.
-
Test with the door closed
The bolt has to throw and retract freely. If it now rubs, we adjust the strike before leaving.
If your bolt has started to drag after reinforcement work, our guide to a deadbolt that won't lock covers strike adjustment in detail.
Reinforcement works with any lock
Deadbolt strike plate reinforcement happens in the frame, so it pairs with whatever deadbolt you have. That makes it the first upgrade we suggest before spending money on a new lock.
It also completes the other upgrades. During a new deadbolt installation, we set the strike up properly the first time. A high security deadbolt resists picking and drilling, but it still needs a frame that will not split. A motorized lock needs the bolt to slide in cleanly, which is why we recheck alignment after reinforcing for a smart deadbolt.
If you are comparing locks at the same time, our breakdown of ANSI/BHMA deadbolt grades explains what the ratings test, and what they cannot promise about your particular frame.
Pull one screw tonight
Open the door, take out one of the screws holding the strike plate and measure it. If it is around an inch long, the strike is held by the jamb alone, and that is your weakest point.
Put it back for now. When you book deadbolt strike plate reinforcement, mention the length you found, and we will bring screws and a box strike sized for your frame.
Next step
Talk to a Deadbolt Fixers specialist
Tell us about the door, the lock and what is going wrong. We will tell you what the job involves before any work starts.
Frequently asked questions
How long should strike plate screws be?
Long enough to pass through the jamb and bite into the framing behind it, which is why Consumer Reports recommends 3 inch screws. Screws 1 inch or shorter make the door easier to force.
What is a box strike?
A box strike is a strike plate with a metal box behind it that lines the bolt pocket, so the bolt sits in steel instead of bare wood. Consumer Reports advises a heavy-duty metal box strike.
Do 3 inch screws really make a door harder to kick in?
In Consumer Reports' testing, yes. Replacing the stock strike with a box strike and 3 inch screws significantly improved kick-in resistance for most locks.
Should hinge screws be replaced with longer ones too?
Yes. Consumer Reports recommends 3 inch screws in the hinges as well, so the hinge side of the door is anchored to the framing like the lock side.
Can long screws pull my door frame out of alignment?
They can if they are driven hard where there is a gap behind the jamb, because the jamb bends toward the stud. We snug them, then test the bolt with the door closed before moving on.
What if there is no solid wood behind my door jamb?
Long screws only help where there is solid wood to anchor into, as Family Handyman points out. We check what is behind the jamb first and plan the reinforcement around it.
What is a door jamb reinforcement kit?
It is a long metal plate that fastens along the jamb around the strike area, spreading the force of a kick over more of the frame. It suits jambs that have split before or are visibly thin.
Does the door edge need reinforcing as well as the jamb?
Sometimes. A door-edge wrap is a metal plate that wraps the edge around the lock holes, which helps when the door itself is cracked or the wood around the bore is weak.
Does a AAA or Grade 1 deadbolt still need a reinforced strike?
Yes. BHMA notes that lab results can differ in the field depending on installation and the door and frame, and the strike is where that difference shows up.
Can a reinforced strike plate make a door kick-proof?
No reinforcement makes a door kick-proof, and anyone who promises that is overselling. It moves the weak point from a thin board to the house framing, which is a much harder target.
Can I reinforce a strike plate without replacing my deadbolt?
Yes. The work is in the jamb and the hinges, so your existing lock and keys stay exactly as they are.
How do I know if my strike plate screws are too short?
Back one screw out and measure it. If it is around 1 inch, it is almost certainly ending in the jamb rather than the framing.