Bobbin Case with 12mm Slot (Part #BC-DBZ(3)-NBL6) for Singer 20U
Optimize your thread delivery with the OEM Bobbin Case (Part #BC-DBZ(3)-NBL6). Specifically engineered for the Singer 20U series, this high-precision component is designed with an expanded 12mm needle slot to accommodate the wide horizontal needle throw required for heavy-duty zig-zag and decorative stitching.

This bobbin case features a built-in "NBL" (No-Back-Lash) brake spring, which prevents the bobbin from spinning too freely when the machine stops suddenly—eliminating thread tangles and ensuring consistent tension from the first stitch to the last.

Key Features & Benefits
Authentic OEM Quality: A factory part manufactured to exact tolerances, ensuring seamless compatibility and superior performance compared to generic alternatives.

12mm Wide Slot: Specially designed for wide zig-zag operations, providing ample clearance for the needle and preventing the needle from striking the case during maximum-width stitching.

Anti-Backlash (NBL) Technology: Features a specialized brake spring that maintains constant pressure on the bobbin, preventing "over-spin" and the resulting thread nests or bird-nesting.

Precision Tension Adjustment: Equipped with a high-quality tension spring and screw, allowing for micro-adjustments to achieve the perfect balance for various thread weights.

Hardened Steel Construction: Built to withstand the rigors of industrial use, offering excellent wear resistance and a long service life.

Orders are typically processed within 1–3 business days.

We ship from our Georgia, USA warehouse. If an item is temporarily unavailable in the U.S., we source it through our global supplier network and will notify you of the estimated lead time.

Free shipping is available on U.S. orders over $99.

Once your order ships, you will receive a tracking number by email.

For urgent orders or shipping questions, please contact us before placing your order.

We stand behind the quality of the products we sell.

• Genuine OEM parts are covered by the manufacturer's warranty where applicable.

• Aftermarket and generic parts are covered against manufacturing defects.

• If you receive a damaged, defective, or incorrect item, please contact us within 30 days of delivery.

• Warranty does not cover damage caused by improper installation, misuse, normal wear, or modifications.

If you have any questions, our support team is happy to help before or after your purchase.