The BOBBIN CASE (Part 15521800400) is a genuine JACK original replacement part designed for JACK JK-6691, S7-91T, S5-A-91C and S5-A-92C series industrial sewing machines, as well as Compatible Postbed with trimmer and Speedway SW 591Q, SW 818D series models. Manufactured to OEM specifications for precise fit and reliable performance.
Equivalent Part Numbers
JACK: 15521800400
Compatible Machines
This part fits the following industrial sewing machine models:
Looking for a replacement bobbin case for your JACK JK-6691 or S7-91T industrial sewing machine? This genuine OEM part is also compatible with Compatible Postbed with trimmer and Speedway SW 591Q series machines. Shop with confidence — all parts ship from Miami, FL.
⚠️ Compatibility Notice: Always verify your machine model and subclass number before ordering. Part numbers and compatibility are provided as a reference only. Supra Sewing is not responsible for purchases made without confirming compatibility with your specific machine. All sales on replacement parts are final.
