Lock Bumping is one of the most common technique used by burglars to break-in any house. According to statistics provided by the National Crime Prevention Council and the Department of Justice, nearly 2/3 of all break-ins occur with no sign of forced entry. Though there is no accurate data as how many break-ins were a result of lock bumping, but most security analyst estimates that over 50% of home burglaries are caused by lock bumping.
What is Lock Bumping
Lock bumping also known as key bumping is a lock picking technique for opening a pin tumbler lock using a specially cut bump key. With this technique most mechanical pin tumbler locks can be open without any damage done to the locks in very little time and using inexpensive tools.
How does bump key work?
The bump key works on basic physics. Consider a set of three billiard balls on a pool table, all three balls touching each other. When you tap the first ball with the cue ball, The last ball will move away. The bump key works on the similar principal. When the bump key is inserted into the lock, and then tapped on with a small hammer, the impact of the hammer travels through the key, into the bottom pins in the lock, and then to the top pins in the lock. Since the top pins are only supported by springs, the springs compress and the top pins jump for a fraction of a second. It is within that short time frame that the lock can be opened.
Misconceptions About How To Guard Against Bumping
Spraying WD-40 in the locks will “loosen the tumblers and make bump keying more difficult”. This has no basis in fact. Lubrication such as WD-40 sprayed sparingly into the key-way, will help your lock cylinder work smoothly with less wear. This will actually helps the bump key as it makes the pins jump in the lock much easier.
A lock cylinder can be made bump resistant by simply re-keying it to a “more appropriate” code. In fact, this will have only a minimal effect on the bump key resistance of a cylinder.
A lock cylinder can be made bump resistant by re-keying it using special tumblers. There are special tumblers designed to increase pick resistance, but use of these will also have only a minimal effect on a cylinder’s bump key resistance.
Expensive locks are even easier to bump key than cheap locks. This claim is made in comparing lower priced and higher priced standard pin tumbler cylinders, without considering high security lock cylinders. In other words, the “expensive” locks referred to, are not high security locks.
Best Bump Resistant Door Locks
Most keyed locks sold in common hardware stores can be opened using bump key technique. To guard against the threat of bump keying, you need door locks that have high security lock cylinders. Door locks which has lock cylinder that is more complex than the standard pun tumbler locks are difficult to bump. But apart from installing bump proof locks you should take additional security measures like lighting the entry and perimeter areas, using alarm systems, motion detectors or keeping a guard dog. Read How to Fortify Your home for additional security measures.
How to guard against the threat of bump keying? Quite simply, high security lock cylinders. Or, more accurately, almost any lock cylinder that is more complex than the standard pin tumbler cylinder. There are many high security cylinders on the market.
4.5 out of 5 stars
- Fully mechanical pushbutton access: no electrical wiring, electronics or batteries
- Extra Heavy Duty Lock; Thousands of possible combinations; Weather Resistant
- Non-handed (reversible) lever for easy installation and versatility
- ASA 161 door prep with additional holes required; Door thickness: 1-3/8″ – 2-1/4″
- Included: 2-3/4″ Backset (Latch); ASA Strike Plate
The Simplex 5000 Series is a heavy duty Mechanical Combination Lock. Combining the traditional Simplex Sequential Code Chamber with a new design housing. The Simplex 5000 is field reversible and non-handed, accepting traditional style cylinders, allowing integration of modern restricted key systems
The latest addition to the line of mechanical pushbutton locks, the Simplex 5000 offers unparalleled strength, convenience and flexibility. This extra heavy-duty lock contains internal drive parts of cast stainless steel and a clutch-free direct-drive design.
4.6 out of 5 stars
- Bump Proof
- Pick Proof
- Heavy Duty, Deadbolt Security
- Covers A Standard 2 1/8″ Hole
- Fits Doors 1 3/8″ to 2″ Thick
- Fits Doors up to 5″ Thick with an Extension Kit
Lockey Original Digital Door Locks L2000 M210 are bump proof, mechanical, keyless entry locks which do not require wires, batteries or electricity. These locks are perfect for new doors and easily replace existing hardware on your current doors. They provide keyless security, are easy to install and use, fit most doors and are weather resistant. Covers a standard 2 1/8″ hole. Fits all doors 1 3/8″ to 2″. 2 3/8″ – 2 3/4″ adjustable deadbolt. For right or left handed doors-changeable handling. Combination can be changed. Dimensions: LOCK ONLY 4 7/8″ X 1 7/16″ X 1 3/4″. TOTAL LOCK dimensions with trim plates 5 5/8″ X 2 1/2″. This is the same deadbolt as the Lockey 2000-different manufacturer packaging. Read More
4.0 out of 5 stars
- Locks out unauthorized keys, cleaning services, repairman, lost or stolen keys
- Single cylinder deadbolt installs like a standard deadbolt with just a Phillips screwdriver
- When the night watch feature is engaged, the lock cannot be opened from the outside, even with a duplicate key
- This lock can only be engaged or disengaged from inside the house
- Features Master Lock’s exclusive bump stop advanced cylinder technology, virtually bump proof and pick proof
The night watch deadbolt from Master Lock is pretty cool. It functions like a regular deadbolt until you switch it into Night Watch mode, at which point no keys can unlock it from the outside. Use it at night to remain secure once all intended key users are home. Use it when you leave for vacation by setting it and backing out the garage door. Developed by Master Lock to respond to keyed break-ins and key bumping, a new form of intrusion, night watch is a great way to enhance your system before the rash of holiday robberies begin. It only takes 15 minutes and a Phillips head screwdriver to install. Read More
4.1 out of 5 stars
- Kwikset Signature Series Product
- Features SmartKey re-key technology; re-key the lock yourself in seconds in 3 easy steps
- Features an adjustable latch to fit all standard door preparations
- Includes standard deadbolt strike
- 1 in. deadbolt throw
The lock you can re-key yourself in seconds SmartKey cylinders feature a stainless steel side locking bar, racks and pins for increased strength and security Patented side locking bar technology offers improved security by protecting against lock bumping & tumbler locks Lifetime mechanical and finish warranty.
3.9 out of 5 stars
- Pick-resistant—it passes the most stringent lock-picking standard (UL437, par 11.6)
- BumpGuard technology offers improved security by protecting against lock bumping
- Features a fully adjustable latch and deadbolt to fit all standard door preparations
- BHMA/ANSI Grade 1 certified deadbolts–the highest level of residential security
- Kwikset Signature Series Product
- Backed by a lifetime mechanical and finish warranty
The Kwikset 98015SMTCP single-cylinder deadbolt featuring SmartKey technology provides the utmost in security without compromising on style: Not only is it ANSI/BHMA Grade 1 certified—the highest level of residential security—it’s also available in a variety of finishes that complement any decor, including satin nickel, antique brass, polished brass, rustic bronze, rustic pewter, and Venetian bronze. Pair it with any Kwikset knob, lever, or handle for a customized look for your entryway that also protects it against intruders.