Seiko Rotary Hook & Base (Part #HSH12MC5)
Restore the precision and reliability of your industrial sewing machine with the Seiko Rotary Hook & Base (Part #HSH12MC5). This high-performance assembly is the "heart" of the stitch-forming mechanism for the Seiko LSW long-arm series.

The rotary hook is responsible for catching the needle thread loop and carrying it around the bobbin case to form a lockstitch. In heavy-duty industrial environments—especially when using thick bonded nylon or polyester threads—a worn or "burred" hook is the primary cause of shredded thread, skipped stitches, and erratic tension. This Seiko assembly is engineered with specialized tip hardness and a precision-ground raceway to ensure smooth operation at high speeds.

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.