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An adjustable mortise cylinder is specifically designed to accommodate different door thicknesses. This feature is significant because it allows for greater flexibility in installation across a variety of door types, ensuring that the cylinder can be securely fitted regardless of the specific dimensions of the door. The ability to adjust the length of the cylinder means that locksmiths can use the same product for multiple installations, which enhances efficiency and reduces inventory needs.

In contrast, a standard mortise cylinder typically has a fixed length and is suited for specific door thicknesses, which limits its versatility. A fixed mortise cylinder also cannot be altered to fit varying door dimensions, making it less adaptable to non-standard installations. A universal mortise cylinder, while it may suggest broader applicability, is not typically defined in the same way as an adjustable mortise cylinder specifically engineered for accommodating variations in door thickness. Thus, the adjustable mortise cylinder clearly stands out as the solution that meets the requirement of fitting varying door thicknesses.