Unfortunately, Hashbytes() only gives you two choices - a 16 character hash (128 bit), or a 20 character hash (160 bit). You may be able to find a different hashing algorithm on the Internet that only uses 10 bytes, or you can use a 128 bit algorithm and simply ignore the extra 6 bytes. Regardless of whether you use a different algorithm or trim a longer one down, you are more likely to encounter a hash collision, simply due to the fewer number of combinations that can be made. In practice, however, you may never encounter a collision, but you should have some way of resolving collisions.

For Ex;
Always keep the hashvalue with 10 characters