Spring Heavy B3103804000 for Juki MO-814 Sewing Machine

This is a genuine Juki heavy spring (Part No. B3103804000) designed for the Juki MO-814 overlock sewing machine. It is an original OEM replacement part used in the machine’s tension or internal mechanism to provide controlled pressure and smooth operation during sewing.

Manufactured to Juki factory standards, this durable heavy-duty spring ensures consistent performance, stable tension support, and long service life. It is ideal for replacing a worn or damaged spring to maintain proper machine function, reduce vibration, and ensure high-quality stitching results.

Compatible with:

• Juki MO-814

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.