Maintain smooth and consistent stitching with the Slack Thread Regulator B1521-552-000, specially designed for the Juki DDL-555-4 sewing machine. This original Juki part helps control thread slack, preventing tangles and ensuring even stitch formation for professional-quality sewing.

Manufactured to precise factory standards, this replacement regulator provides durability, accurate fit, and reliable long-term performance. It is an essential component for maintaining optimal operation and reducing thread-related issues in your industrial sewing machine.

Key Features:

Juki slack thread regulator

Part No. B1521-552-000

Designed for Juki DDL-555-4 and compatible with DDL-555 machines

Controls thread slack for consistent stitching

Durable, factory-quality construction

Helps prevent thread tangles and stitching errors

Easy to install and reliable in operation

Keep your Juki DDL-555 sewing machine running efficiently and producing flawless stitches with this authentic slack thread regulator.

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.