Minimum Requirements for a Secure Deadbolt Lock
Deadbolt locks can provide a significant security upgrade over commonly used spring latch locks. Deadbolts operate in the manner their name implies. The bolt is ‘dead’, not subject to picking or other tampering with special tools, as are spring latch (also known as slip bolt) locks. The bolt of a deadbolt lock must be manually moved by either a knob or a key, and when locked it effectively bolts the door to its frame. It does not make use of a spring-loaded mechanism that can be manipulated by anyone with the required skill. Before deciding on a new dead bolt installation, make sure to select a lock with adequate security capabilities.
Deadbolt Throw and Strike Plate
The bolt of a deadbolt lock is referred to as the throw. The throw needs to extend a minimum of one inch into the doorjamb when the deadbolt is locked. This makes it more difficult for potential intruders to pry the doorjamb away from the deadbolt and get the door open. The strike plate, or the metal plate on the door frame that surrounds the bolt when it is locked into the doorjamb, must be made of heavy gauge metal. It should be attached with screws three inches long that reach through the doorjamb and into the wall. This will securely attach the strike plate, and therefore the throw, to the frame.
Saw and Drill Resistance
Two of the methods burglars use to circumvent deadbolt locks are sawing through the bolt and drilling the lock out. Anyone considering a new deadbolt installation should use a lock that incorporates available anti-drill and saw resistance features. To defeat attempts at sawing, resistant bolts have imbedded anti-saw pins. When these encounter a saw blade, they rotate along with the blade, preventing the blade from achieving the bite necessary to make continued cutting progress. This greatly slows down or deters sawing of the bolt. Case-hardened steel chips imbedded in the lock housing make drilling out the lock time-consuming and difficult at best. These hardened metal chips wear down and destroy drill bits. Hardened case steel used in the housing of better locks make it difficult to cut, saw or twist the lock off.
ANSI ratings are developed by The Builders Hardware Manufacturers Association (BHMA) for quality standards for locks, and these are applied for testing by the American National Standards Institute (ANSI). The ANSI tests deadbolt locks and new deadbolt installation in areas such as throw length, drill resistance and saw resistance and rates according to grading category. While ANSI grade 3 is considered applicable for basic, residential use, a grade 2 rating (heavy residential and light commercial use) is the minimum for any deadbolt lock for homeowners concerned with security. Although it’s considered high-traffic commercial grade, ANSI grade 1 rated deadbolts are recommended by insurance carriers and are an even better choice for home security.
Deadbolt locks, even in their most basic design, offer many security advantages over slip bolt locks. However, deadbolt locks themselves differ greatly in their security potential. The better choices incorporate important features that make them resistant to the typical assaults by potential intruders. Anyone considering a new dead bolt installation should look for a lock with a minimum ANSI grade 2 rating, or even better, a grade 1 rating.A qualified Locksmith in Flushing can help you to choose and install the best dead bolt lcok.