Strongest Screws For Entry Door Theft Deterrence?

[Derrick]

Hi, I am trying to upgrade the strength of my entry door for deterrence of break-ins. I am changing out my hinge screws, and knob and deadbolt lock screws (both in door side and the jam side) with 3" screws. I know not all screws are created equal and want to use the strongest screws for this. I know enough not to get the cheap Everbuilt brand screws from the big box store.

I tried to research this, but no definitive info like "this is what you want for your doors" or "this is among the strongest of the screws you will typically find". It looks like the production screws or multipurpose screws are better than the Everbuilt stuff, and I saw mention of GRK R4 and SPAX brand, but again nothing about the type from them or if that is about as good as I can do for strength.

Anyone have any knowledge or professional experience with strengthening doors that knows what would be the strongest screw type to use on hinges and locks/handles when upgrading the screws to 3" for better resistance to a door getting kicked in?

Thanks!!

 

[SandburRanch]

Hi, I am trying to upgrade the strength of my entry door for deterrence of break-ins. I am changing out my hinge screws, and knob and deadbolt lock screws (both in door side and the jam side) with 3" screws. I know not all screws are created equal and want to use the strongest screws for this. I know enough not to get the cheap Everbuilt brand screws from the big box store.

I tried to research this, but no definitive info like "this is what you want for your doors" or "this is among the strongest of the screws you will typically find". It looks like the production screws or multipurpose screws are better than the Everbuilt stuff, and I saw mention of GRK R4 and SPAX brand, but again nothing about the type from them or if that is about as good as I can do for strength.

Anyone have any knowledge or professional experience with strengthening doors that knows what would be the strongest screw type to use on hinges and locks/handles when upgrading the screws to 3" for better resistance to a door getting kicked in?

Thanks!!

Stainless

 

[Crumpler4]

Sorry for the long post. You’re on the right track—replacing hinge and lock screws with 3” or longer structural screws greatly increase resistance to forced entry. Go with GRK R4 or SPAX structural screws — not drywall or deck screws. For both brands, look for:

• 3” to 3½” length — to reach solid framing
• #9 or #10 gauge
• Flat head — for strike plates and hinges
• Star drive (T25) — better torque, no cam-out
• Corrosion resistance (e.g., GRK’s Climatek or SPAX’s HCR)

These screws are hardened, rated for structural loads, and won’t shear off like cheap alternatives. And both both reduce splitting and make installation easier because of tip and thread design.

Screws are just one part of the overall strength. If you’re in a timber-framed house, make sure those long screws reach into solid studs. For homes with masonry walls, check how the door frame (often a timber buck) is fixed to the masonry. If that connection is weak, you may need to use masonry anchors or proper fixings to secure the frame itself. Sometimes they are only held with a structural glue which can be extremely strong, but it should still have screws as well since weather and time will weaken the bond.

Also worth considering are full-frame reinforcement kits—sold under names like Door Armor—that add steel reinforcement around the latch and hinges and help distribute force during a break-in attempt. These are especially helpful on traditional wooden doors.

Multi-point locking doors are also available in the U.S. but do not seem to be as common as in the U.K. Modern doors in the U.K. especially patio and uPVC doors—use multi-point locking systems. These engage bolts or pins at the top, bottom, and side when the handle is lifted and locked. If your door already uses one of these, you’ve got a good foundation. Just make sure the lock mechanism is solid and the door is correctly aligned so all points fully engage. You can buy retrofit kits to change a single point lock to a multi-point lock.

Solid-core doors, reinforced frames, and secure hardware all work together. Screws matter—but it’s the whole assembly that resists a break-in.

 

[Derrick]

Sorry for the long post. You’re on the right track—replacing hinge and lock screws with 3” or longer structural screws greatly increase resistance to forced entry. Go with GRK R4 or SPAX structural screws — not drywall or deck screws. For both brands, look for:

• 3” to 3½” length — to reach solid framing
• #9 or #10 gauge
• Flat head — for strike plates and hinges
• Star drive (T25) — better torque, no cam-out
• Corrosion resistance (e.g., GRK’s Climatek or SPAX’s HCR)

These screws are hardened, rated for structural loads, and won’t shear off like cheap alternatives. And both both reduce splitting and make installation easier because of tip and thread design.

Screws are just one part of the overall strength. If you’re in a timber-framed house, make sure those long screws reach into solid studs. For homes with masonry walls, check how the door frame (often a timber buck) is fixed to the masonry. If that connection is weak, you may need to use masonry anchors or proper fixings to secure the frame itself. Sometimes they are only held with a structural glue which can be extremely strong, but it should still have screws as well since weather and time will weaken the bond.

Also worth considering are full-frame reinforcement kits—sold under names like Door Armor—that add steel reinforcement around the latch and hinges and help distribute force during a break-in attempt. These are especially helpful on traditional wooden doors.

Multi-point locking doors are also available in the U.S. but do not seem to be as common as in the U.K. Modern doors in the U.K. especially patio and uPVC doors—use multi-point locking systems. These engage bolts or pins at the top, bottom, and side when the handle is lifted and locked. If your door already uses one of these, you’ve got a good foundation. Just make sure the lock mechanism is solid and the door is correctly aligned so all points fully engage. You can buy retrofit kits to change a single point lock to a multi-point lock.

Solid-core doors, reinforced frames, and secure hardware all work together. Screws matter—but it’s the whole assembly that resists a break-in.

Thank you for the informative post, very helpful! I could only use #9 screws and was not able to find GRK R4 or SPAX at my Home Depot. I realize to stay away form the cheap Everbuilt brand and other Asian cheapies, and that drywall screws are very weak, but what is wrong with deck screws?

 

[Crumpler4]

Good question; deck screws are still quite strong but are more likely to snap while you are screwing them in. A typical deck screw (#9) might snap at 70 inch pounds of torque versus 90 inch pound for Spax and 105 for GRK R4. Deck screw are not designed for high shear loading as well.

If a screw snaps off while you are installing a lock or hinge into door frame, it can be a real problem if the screw shank is deep in the wood and you cannot remove the screw. Then that broken screw is blocking the only place you can add another screw. If that happens, you may need to drill it out fully and plug/glue the hole with a wooden plug.

I can see that Home Depot may sell Fastenmaster and Simpson SDWS. These have even higher breaking torque of around 120 inch pounds. They have good ratings as well for structural use.

 

[SandburRanch]

Screws break from twisting because anchor and pilot holes were never drilled and screws being forced in .

 

[Derrick]

Good question; deck screws are still quite strong but are more likely to snap while you are screwing them in. A typical deck screw (#9) might snap at 70 inch pounds of torque versus 90 inch pound for Spax and 105 for GRK R4. Deck screw are not designed for high shear loading as well.

If a screw snaps off while you are installing a lock or hinge into door frame, it can be a real problem if the screw shank is deep in the wood and you cannot remove the screw. Then that broken screw is blocking the only place you can add another screw. If that happens, you may need to drill it out fully and plug/glue the hole with a wooden plug.

I can see that Home Depot may sell Fastenmaster and Simpson SDWS. These have even higher breaking torque of around 120 inch pounds. They have good ratings as well for structural use.

#8 is what it took to sit flush with the hardware (latches, strikes etc.) without sitting proud. I could not find any GRK like that which didn't have "fins" under the bugle head for digging out wood - but would cause the head not to sit flush in the hardware. They also had designs to the threads that were designed to remove wood during installation. I went with the "Grip Rite" brand exterior screws Home Depot carries (which is the majority of their screws) because I was hopeful they were better than the cheap zinc Everbuilt brand they sell... though they are all likely made in China and possibly in the same factory. Hopefully steel instead of zinc though. I did pre-drill to prevent problems, and angled slightly for the latch plate to help ensure the screw made it into the frame. I used the longest screws I could without danger of hitting a wire on the other side or other obstacles. Hope these screws are a good enough choice after going through all the trouble in the 1st place. Up next is a wrap-around door/deadbolt reinforcement plate.