Replacement Bobbin Case for Bernina Sewing Machines

Quality replacement bobbin case designed for select Bernina sewing machines. This essential component holds the bobbin and maintains proper thread tension for the underside of your stitches, ensuring smooth, consistent sewing performance.

Product Specifications

• Part Number: 0040777000
• Type: Replacement bobbin case
• Function: Holds bobbin and regulates lower thread tension
• Compatibility: Select Bernina models (see list below)

Key Features

• Quality Replacement: Manufactured to meet original specifications for reliable performance
• Proper Tension Control: Maintains correct lower thread tension for balanced, professional stitches
• Essential Replacement: Critical component when original bobbin case is worn, damaged, or lost
• Direct Fit: Designed specifically for listed Bernina models - no modifications needed

When to Replace Your Bobbin Case

• Thread tension issues that can't be corrected by adjustment
• Visible wear, scratches, or burrs on the bobbin case surface
• Bobbin case spring is damaged or weakened
• Thread keeps breaking or shredding
• Uneven or loopy stitches on fabric underside

Compatible Bernina Models

117, 121, 217, 217N, 217N-C, 317, 517, 540, 542, 544, 640 (Not Artista 640), 640-2, 740, 741, 742, 750, 840, 841, 842, 850, 851, 852, 940, 950

Note

This is a quality replacement bobbin case designed to meet original specifications. Bernina compatible - not Bernina trademark. Verify your model number before ordering to ensure proper fit. Note: Does NOT fit Artista 640.