This premium Grade A bobbin case (part # 15277Z) is specifically designed for use with Singer 15 class sewing machines. The bobbin case is a critical component that holds the bobbin and regulates thread tension for the lower thread, working in conjunction with the hook assembly to form stitches. High-quality construction ensures reliable performance and consistent stitch quality.

Specifications:

• Part Number: 15277Z
• Type: Replacement 
• Grade: Grade A (premium quality)
• Class: Singer 15 class bobbin case
• Function: Holds bobbin and regulates lower thread tension

Machine Compatibility:

Fits Singer 15 class models: 223, 237, 239, 15-30, 15-80, 15-86, 15-87, 15K30, 15K80, and other Singer 15 class machines

Function & Benefits:

The bobbin case is essential for proper stitch formation. It holds the bobbin securely in place, controls the tension of the lower thread through an adjustable tension spring, and works with the hook assembly to create balanced, even stitches. Grade A quality ensures precise manufacturing tolerances for smooth operation, consistent tension control, and long-lasting durability.

Installation Note:

Replace a damaged, worn, or missing bobbin case to restore proper stitch quality. Ensure the bobbin case is properly inserted into the hook assembly and that the tension spring is correctly adjusted for your thread and fabric type.