Thread Tension Assembly regulates the amount of resistance applied to the needle thread as it moves toward the fabric. Turning the plastic cap adjusts the internal tension spring, tightening or loosening the upper thread to achieve well-balanced, high-quality stitches. This is a highly versatile standard part used across multiple generations of Juki industrial flat-bed sewing machines and their clones.

Machine Compatibility: This is a highly versatile standard part used across multiple generations of Juki industrial flat-bed sewing machines and their clones.

• Juki Models: DDL-5550, DDL-8500, DDL-8700, and DDL-8700-7.

• Other Brands: Fully compatible with standard Jack, Siruba, or Typical single-needle lockstitch machines.

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.