The 644D is our most advanced MyLock serger, with speeds up to 1300 stitches per minute. It features electronic control, a handy needle threader, and an easy Upper Knife release. An instructional video ensures that you'll be serging with professional results in no time.

The 644D has 2 needles and 2, 3 or 4 thread stitching capabilities. Equipped with differential feed, which is adjustable from .05 to 2.25, the 644D provides increased control for handling all types of fabrics and is essential for creative serger techniques. And, you can adjust the cutting width of the knives up to 7.3mm, wider than any other MyLock serger.

Threading is simplified by color-coded thread guides and a self-threading lower looper. Simply lay the thread into the guide, flip a switch, and the lower looper is threaded. The guide is automatically returned to its normal position when you turn the balance wheel. And when you lift the presser foot for rethreading, the thread tensions are automatically released so you can draw the thread smoothly.
Because a lower looper pre-tension control eliminates the need to change tension for rolled hems, you can switch quickly to rolled hemming without changing the needle plate.

The MyLock 644D is the easy way to get fast, professional results.