A strike plate installs into the pre-mortised pocket on the strike jamb of a hollow metal door frame. The procedure requires an impact driver or compact drill fitted with a #3 Phillips bit, and the strike plate secures with two or more screws depending on the plate configuration. Proper installation ensures the door latch or deadbolt engages cleanly into the strike pocket, providing secure closure and correct door operation.
CDF Distributors ships complete door and frame assemblies with pre-mortised strike preparations from its Nashville, Tennessee headquarters. You can configure and order online using CDF’s ProBuilder tool at cdfdistributors.com. For assistance selecting the correct strike plate for your assembly, call (855) 769-9895 or email sales@cdfdoors.com.
What Is a Strike Plate?
A strike plate is a flat metal plate that mounts to the strike jamb of a door frame, directly opposite the door’s latch or bolt. The plate contains a rectangular or curved opening (the strike pocket or lip) that receives the latch bolt when the door closes. The strike plate serves three functions: it provides a hardened engagement surface for the latch or bolt, it protects the frame from wear caused by repeated latch cycling, and it provides a finished appearance on the jamb face.
In commercial hollow metal frames, the strike plate sits in a mortised recess that is cut or stamped into the strike jamb during fabrication. CDF Distributors pre-mortises strike preparations into every frame at its Nashville facility, so the strike plate drops into the prepared pocket without field modification. The strike plate must align precisely with the latch or bolt on the door so that the latch extends fully into the strike pocket when the door is in the closed position.
Types of Strike Plates
Commercial hollow metal frames accept several strike plate configurations depending on the lockset type, fire rating, and door function. The strike plate type is determined during hardware selection and must match the lock or latch being installed on the door.
- Standard strike plates are flat plates with a single rectangular lip opening. They are used with cylindrical locksets and most passage or privacy function hardware. The standard strike is the most common configuration in commercial interior applications.
- ANSI strike plates conform to American National Standards Institute dimensional standards. ANSI strikes are specified when the hardware schedule calls for standardized prep dimensions. They ensure interchangeability between different manufacturers’ locksets without frame modification.
- T-strike plates have a T-shaped profile and are used with mortise locksets. The T-strike is taller than a standard strike and accommodates both the latch bolt and the deadbolt in a single plate. Mortise lock applications in commercial corridors and stairwells typically require T-strikes.
- Deadbolt strike plates are reinforced plates designed to receive a deadbolt throw. They are typically deeper than latch-only strikes and may include a box behind the plate that fully encloses the extended bolt for added security.
- Combination strike plates accommodate both a latch bolt and a separate deadbolt. These are used when the door has both a lockset and an independent deadbolt mounted at different heights on the door edge.
- Dust-proof strike plates include a spring-loaded plunger that sits flush with the strike lip when the door is open, preventing debris from accumulating in the strike pocket. They are common in high-traffic commercial environments.
Installation Specifications
This guide covers the installation of a strike plate into a pre-mortised hollow metal door frame. The frame must have a factory-prepared strike mortise that matches the strike plate being installed. The strike plate type and dimensions are determined by the lockset or latch hardware specified in the project hardware schedule. Standard strike plates are secured with #12 x 1-1/4” flat-head Phillips screws driven with a #3 bit.
At a Glance
Component | Strike plate (flat-mounted, mortised into strike jamb) |
Frame Type | Hollow metal, 16-gauge or 14-gauge steel |
Preparation | Factory pre-mortised strike pocket in strike jamb |
Fasteners | #12 x 1-1/4” flat-head Phillips screws (typically 2 per plate) |
Driver Bit | #3 Phillips (required to prevent screw stripping) |
Alignment Reference | Latch bolt centerline on the door edge |
Estimated Install Time | 5 to 10 minutes per strike plate |
Tools and Materials
- Impact driver or compact drill: for driving strike plate screws
- #3 Phillips bit: required for #12 strike plate screws; prevents stripping and cam-out
- Strike plate: must match the lockset type and frame preparation
- Strike plate screws: typically #12 x 1-1/4” flat-head Phillips; supplied with hardware
- Tape measure: for verifying latch bolt height and strike pocket alignment
- Pencil or marking tool: for marking adjustment positions if shimming is required
- File or rotary tool: for minor field adjustments to the strike pocket if needed
- Safety glasses: required PPE when drilling into metal
- Door silencers: rubber bumpers installed in the strike jamb to cushion door closure
Step-by-Step Installation
Step 1: Verify the Strike Mortise Preparation
Before installing the strike plate, confirm that the frame has a factory-prepared strike mortise in the correct location.
- Locate the strike mortise on the strike jamb. On a CDF frame, the mortise is pre-cut at the factory to match the hardware specified on the order.
- Verify the mortise height. The center of the strike pocket should align with the latch bolt centerline on the door. Standard latch height is 38” to 40” from the finished floor, but this varies by hardware schedule.
- Check that the mortise is clean and free of paint, debris, or burrs that could prevent the strike plate from seating flush.
If the frame was ordered through CDF’s ProBuilder, the strike preparation location and dimensions are specified on the shop drawings included with the shipment.
Step 2: Test-Fit the Strike Plate
Before driving screws, place the strike plate into the mortise to confirm proper fit.
- Set the strike plate into the mortised recess on the strike jamb. The plate should sit flush with the jamb face without rocking or protruding.
- Verify that the screw holes in the strike plate align with the pre-drilled or pre-tapped holes in the frame.
- Confirm that the strike lip (the opening in the plate) faces the correct direction to receive the latch bolt. The lip opening must face the door stop side of the frame.
Labeled diagram showing: strike plate seated in mortise, lip opening facing door stop, screw holes aligned with frame prep, and flush seating against jamb face. This diagram requires CDF approval before inclusion in the production file.
Step 3: Drive the Screws
With the strike plate properly seated and aligned, secure it to the frame.
- Insert the #3 Phillips bit into your impact driver or compact drill. A #3 bit is required for #12 screws. Using a #2 bit on #12 screws will strip the screw heads and compromise the fastener engagement.
- Start each screw by hand to confirm thread engagement before using the driver. This prevents cross-threading.
- Drive the screws until the screw heads sit flush with the strike plate surface. Do not over-torque. The screw heads should be flush, not countersunk below the plate surface.
- Confirm the strike plate is still flush with the jamb face after tightening. If the plate shifted during fastening, loosen and reseat.
Step 4: Test the Latch Engagement
After securing the strike plate, test the door to verify proper latch operation.
- Close the door slowly and observe the latch bolt entering the strike pocket. The latch should extend fully into the pocket without binding or scraping against the plate edges.
- Check that the door pulls tight against the stop when latched. If there is excessive play between the door face and the frame stop, the strike plate may need to be shimmed or the latch adjusted.
- Open and close the door several times to confirm consistent operation. The latch should retract and extend smoothly each time.
- If the door has a deadbolt, extend the bolt fully into the strike and verify the bolt enters the pocket without resistance. A misaligned deadbolt strike will cause the bolt to hit the plate face rather than entering the pocket.
Step 5: Install Door Silencers
Door silencers (rubber bumpers) are installed in the strike jamb to cushion the door against the frame when closing.
- Locate the pre-drilled silencer holes on the strike jamb. Standard commercial frames have three silencer locations: one above the strike, one below the strike, and one near the top of the jamb.
- Press each silencer into its hole until it seats firmly. Silencers are friction-fit and do not require adhesive or fasteners.
Door silencers prevent metal-to-metal contact between the door and frame, reduce noise, and help the door seal against the stop for consistent latching.
Common Mistakes to Avoid
Avoid these common errors during strike plate installation:
- Using a #2 bit instead of a #3 bit. Strike plate screws are typically #12 fasteners that require a #3 Phillips bit. A #2 bit will cam out under torque, stripping the screw head and making the fastener difficult to drive or remove. This is the most common strike plate installation error.
- Installing the strike plate upside down or backwards. The strike lip must face the door stop side of the frame. If the lip faces the wrong direction, the latch bolt cannot enter the strike pocket.
- Over-torquing the screws. Driving screws past flush can warp the strike plate or strip the threads in the frame. The screw heads should sit flush with the plate surface.
- Not verifying latch alignment before final tightening. The strike pocket must align with the latch bolt centerline. If the strike is even 1/8” off vertically, the latch may not fully engage, resulting in a door that does not stay latched.
- Forcing a mismatched strike plate into the mortise. The strike plate must match the frame preparation. A T-strike will not fit a standard strike mortise, and a standard strike will not function in a T-strike preparation.
- Skipping the test-fit step. Driving screws without first confirming the plate seats flush and the holes align can result in a crooked or protruding strike plate that interferes with door operation.
Strike Plate Alignment and Adjustment
If the latch bolt does not engage the strike pocket cleanly after installation, the strike plate or frame may require adjustment. Minor alignment issues are common and correctable in the field.
- Vertical misalignment. If the latch hits above or below the strike pocket, the strike plate is mounted too high or too low relative to the latch centerline. Loosen the screws, reposition the plate, and re-drive. If the mortise does not allow repositioning, a file can be used to extend the lip opening slightly.
- Lateral misalignment (latch does not fully extend into pocket). This typically indicates the door is not closing tight against the stop. Check the hinge jamb for plumb. An out-of-plumb hinge jamb shifts the door position relative to the strike, preventing full latch engagement.
- Door rattles when latched. If the door moves back and forth in the frame when latched, the strike pocket is too deep or the latch throw is too short. Adjustable strike plates with a built-in shim tab can correct this. Alternatively, adding a thin shim behind the strike plate brings the pocket closer to the door face.
- Deadbolt does not extend fully. If a deadbolt hits the strike plate face instead of entering the pocket, the strike is misaligned or the wrong strike type was installed. Deadbolt strikes must have a pocket deep enough to receive the full bolt throw, typically 1”.
Strike Plates in Fire-Rated Assemblies
In fire-rated door assemblies, the strike plate is a listed component that must comply with the assembly’s fire test report. Fire-rated assemblies are available at 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute (3-hour) rating levels. The strike plate, along with the door, frame, hinges, lockset, and all other components, must be listed for the required rating level.
- Fire-rated strike plates must not be modified in the field. Filing, grinding, or enlarging the strike pocket on a fire-rated frame voids the fire label. If a fire-rated strike does not align with the latch, the issue must be corrected by adjusting the door, hinges, or lockset rather than modifying the strike preparation in the frame.
- All fire-rated hardware must carry a label from a recognized testing laboratory (UL, WHI, or Intertek). CDF Distributors rivets fire labels onto every fire-rated frame assembly before shipping.
- The Authority Having Jurisdiction (AHJ) may inspect fire-rated assemblies for compliance. Verify all code requirements with project specifications and the AHJ before final installation.
Configure Your Assembly
CDF’s ProBuilder tool allows contractors and facility managers to configure door and frame assemblies online, including strike plate preparation. During configuration in ProBuilder, the strike type is selected as part of the hardware schedule and the frame is fabricated with the correct mortise preparation. ProBuilder displays compatible options and provides instant pricing.
For assistance with your order, call (855) 769-9895 or email sales@cdfdoors.com. CDF’s sales team is available Monday through Friday, 7:30 AM to 4:30 PM CT.
Frequently Asked Questions
What size drill bit do I need to install a strike plate?
A #3 Phillips bit is required for standard #12 strike plate screws. Using a #2 bit will strip the screw heads. The #3 bit provides full engagement with the screw recess and prevents cam-out under the torque required to drive screws into a steel frame.
What is the difference between a standard strike and a T-strike?
A standard strike plate has a single rectangular lip opening and is used with cylindrical locksets. A T-strike has a taller T-shaped profile that accommodates both a latch bolt and a deadbolt in a single plate, and is used with mortise locksets. The frame must be prepared with the correct mortise for each type.
How do I know if my strike plate is aligned correctly?
Close the door and observe the latch bolt entering the strike pocket. The latch should extend fully into the pocket without scraping or binding. If the latch hits the plate face above or below the pocket, the strike is vertically misaligned. If the latch does not extend fully, check the hinge jamb for plumb.
Can I modify a strike plate on a fire-rated frame?
No. Filing, grinding, or enlarging the strike preparation on a fire-rated frame voids the fire label. If a fire-rated strike does not align with the latch, correct the issue by adjusting the door, hinges, or lockset. Fire-rated assemblies are available at 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute rating levels, and all components must remain unmodified to maintain the rating.
Why does my door rattle when latched?
A rattling door typically indicates excessive clearance between the latch bolt and the strike pocket. The strike pocket may be too deep, or the latch throw may be too short. An adjustable strike plate with a shim tab can reduce the pocket depth. Alternatively, placing a thin shim behind the strike plate brings the pocket closer to the door face and eliminates play.
Do strike plates come with the door frame or the lockset?
Strike plates are typically packaged with the lockset hardware, not the frame. However, CDF Distributors pre-mortises the strike preparation into the frame based on the hardware specified in the order. When ordering through ProBuilder, the strike type is selected during hardware configuration and the frame ships with the correct preparation.
How long does it take to install a strike plate?
Strike plate installation takes approximately 5 to 10 minutes on a frame with a factory-prepared mortise. Additional time may be needed if latch alignment requires adjustment after the initial install.
About This Guide
This installation procedure reflects CDF Distributors’ standard fabrication specifications and field-tested installation method used by commercial contractors nationwide. The full installation video is available on CDF’s YouTube channel at youtube.com/@CDF_Distributors.
For questions about strike plate installation or to order a door and frame assembly, contact CDF at (855) 769-9895 or sales@cdfdoors.com. Configure your assembly online at cdfdistributors.com using ProBuilder.
