American Lock Door Key Compatible Padlocks The Benefits of Compatibility

Padlocks in some form have been around almost forever.


If you Google "History of Padlocks," you'll receive over 998,000 site choices in a split second. Padlocks in some form have been around almost forever. One of the limitations that existed for years with any keyed padlock was the fact that it had to be on a different key from door locks in a...


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If you Google "History of Padlocks," you'll receive over 998,000 site choices in a split second. Padlocks in some form have been around almost forever.

One of the limitations that existed for years with any keyed padlock was the fact that it had to be on a different key from door locks in a building. For the most part, padlock keys were smaller than standard knob and deadbolt keys. You couldn't key a padlock to a door lock key and you couldn't key the door lock to the padlock key. The only solution was to carry separate keys.

Another problem was that the common padlocks, those manufactured by a padlock company instead of a door lock manufacturer, were keyed at the factory before the padlocks were riveted together. Rekeyable padlocks didn't exist in the old days. Most of the padlocks were impractical to service.

Padlock manufacturers did offer master keying choices that were controlled by the mathematical limitations of the padlock cylinders. In a four pin, four depth system you would get 256 theoretical key changes. After eliminating the Top Master Key and other undesirable and uncuttable keys, you would have a very limited padlock master key system to offer your customer.

According to the American Lock website, John Junkunc, a railroad machinist from Hungary, arrived on our shores in the early 1900s with the determination to achieve the American dream of free enterprise. He invented the first dial combination padlock because of constantly misplaced keys. Over the decades he built the company on a strong foundation of handcrafted padlocks and was a leading innovator of padlock construction.

Today, the line of American padlocks and products has been restructured and revised after being purchased by Master Padlock Company L.L.C. in 2005.

American Lock Commercial Products focuses on Commercial Grade aluminum, brass and steel bodied padlocks and the American line of rim, mortise and key-in-knob cylinders.

Today, in addition to a full line of field serviceable padlocks that are rekeyable to other padlock keys, the locksmith has the option of offering his customers commercial quality padlocks that are compatible with a house or office key.

American Lock offers three padlock models that are door key compatible: A3600 Series, A3700 Series and A3800 Series. These three padlock models vary in material, size and available options. Let's take a close look at all three:

A3600 Series & A3700 Series

The A3600 Series padlocks are constructed with a one and three-quarter inch wide by three-quarter inch thick solid brass body that resists corrosion in harsh environments. The dual ball bearing locking mechanism resists prying and pulling the shackle from the locked position. The 5/16" diameter Boron alloy steel shackle is available in four different lengths with the model number of the lock indicating the shackle length.

Model A3600 indicates one and one-eighth shackle length (Photo 1), A3601 indicates two-inch length, A3602 indicates three inches (Photo 2) and A3605 shackle is five inches long. (Photo 3)

The A3700 Series padlocks are constructed with a two-inch wide by three-quarter inch thick solid brass body that resists corrosion in harsh environments. The dual ball bearing locking mechanism resists prying and pulling the shackle from the locked position.

The 5/8" diameter Boron alloy steel shackle is available in three different lengths with the model number of the lock indicating the shackle length. Model A3700 indicates one and one-eighth length, A3701 indicates two-inch length and A3702 indicates three inches long.

Both series offer optional brass shackles for increased corrosion resistance. (Photo 4)

Custom laser engraving is available in up to six different areas (front / back / top / bottom / left side / right side) of the padlock to personalize and identify each lock. Other options are the CN nine-inch long zinc-plated #40 Sash Chain and the SBC nine-inch long solid brass Double Loop Chain to retain the padlock at its site.

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