Although most keys come with numbers either embossed or stamped onto them, their meanings aren’t typically known. Depending on the type of key, the numbers you see could be essential for any locksmith trying to perform a key replacement or duplication. Here are three types of key numbers and the meanings behind them. 

A Guide to Key Numbers

1. Bitting Numbers

The bitting number on a key references the depth of the cuts needed to replicate that key. A locksmith uses this number to follow the geometry of the key – the coding system can vary from lock company to company. But in most cases, a higher number translates to a deeper cut. 

If your key’s bitting number (located underneath the bow, or handle) is 3689, you should see cuts increasing in depth as you go down the key. 

2. Blank Model Codes

Key blanks are keys that haven’t yet been cut to a designated bitting. Blank model codes are usually found on the bows, or handles, of key blanks.

For a good key replacement or copy to be made, the new model will need to have a similar shape and length. The model code serves to help locksmiths identify blank keys that will be a strong match with yours.

3. Key Codes

Usually, keys come with code numbers when they’re intended for offices, cabinets, industrial equipment, alarm boxes, and similar applications. The keys look different from standard versions, and the locks they open aren’t the type used in conventional doors.

When these keys are misplaced, the code numbers can be used to create a replacement key. If the code itself is also lost, the process for obtaining it will depend on whether it has been published. Published codes can be obtained by a locksmith, but unpublished numbers need to be obtained from the key manufacturer. 
 

If you need help with key replacements, lock repairs, or lockouts, you can turn to the experts at Cohen's Key Shop. These professionals have provided New Haven County, CT with locksmith services since the 1800s, and are qualified to handle any job you put in front of them. Visit their website for more information, or call (203) 397-3528 today.