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Unlike standard lockstitching, which uses a bobbin, overlock sewing machines utilize loopers to create thread loops for the needle to pass through, in a manner similar to crocheting. Merrow's original three-thread overedge sewing machine is the forerunner of contemporary overlocking machines.
The larger the number, the larger the blade of the needle. Often you will see both sizing numbers on the needle package, such as 60/8 and 70/10. Home sewing machine needles are also classified as the 130/705 H system, which means they are for use in home sewing machines rather than industrial machines. The blade is what determines the needle size. ( 2 For example, a size 75 needle has a blade that is .75 mm in diameter.). 3  The shaft is the âbodyâ of the needle, and the groove that runs the length of the shaft holds the needle thread.