BERNINA Hook & Bobbin Case for 8+ Models, #0040787000

The BERNINA Hook and Bobbin Case assembly (part #0040787000) is a complete rotary-hook unit that restores proper lower-thread function to your sewing machine. The assembly works as a matched set: the rotary hook captures the needle thread and forms each stitch, while the included bobbin case (#0040777000) holds the bobbin and maintains correct lower-thread tension. Replacing both components together eliminates the guesswork of chasing tension problems caused by a worn hook surface or a fatigued bobbin-case spring -- you get a fresh, factory-toleranced pair that works in concert from the first stitch.

This hook and bobbin case assembly is designed for the BERNINA rotary-hook platform spanning the 100 through 900 generations, covering the 117/217/317/517 compact series, the 540/640 midrange models, the 740/840/940 computerized range, and the 750/850/950 quilting editions -- approximately 24 models in the BERNINA lineup. Compatible with BERNINA machines only.