Metal sheet door hardening is reinforcing various parts and components of the door, including installing additional hardware, to ensure immunity to kick-ins and decrease susceptibility to a variety of other break-in methods.
For metal sheet doors we recommend installing 16 gauge doors with 18" or larger strike plates, a minimum of three hinges that are 4.5" x 4.5" or larger, 3.5" #9 screws for the strike plate and hinges, a full door length latch guards, a grade 1 deadbolt, and a grade 1 door closer.
We recommend installing 16 gauge sheet metal doors.
The sheet metal doors starting from 16 gauge are heavier and more burglar resistant. Of course, going with 18-22 gauge sheet metal door is a better option.
Consistent, effective closing and latching is the purpose of a closer. Grade 1 closers meet ADA requirements for door opening resistance pressure while still providing for consistent closings. Grade 2 closers do not meet the stands consistently.
Quality hinges and their proper installation are essential to the proper operation of the door. Light weight hinges bend and prevent the door from closing. Poorly installed hinges (with improper srews) also mis align the door and prevent the door from opening or closing well.
A full length latch guard covers the gap from the top of the door to the bottom and makes it very difficult to pry open the door, even with a 36" crowbar. The quality of the latchguard is very important. Short 12" ones are very ineffective.
We use 18" tall strikes with 3.5" hardened #9 deck screws to spread the force of some one kicking or prying the door over 18 inches of the jamb instead of 2 inches. This makes the strike plate on the jamb stronger than most doors and eliminates it as the "weakest link" in the door opening.
Heavy commercial doors require heavy duty hinges. Light weight hinges bend and misalign the door. These heavy duty hinges help thwart break-in attempts.