Lower Knife is a high-quality industrial sewing machine cutting blade used in Brother overlock (serger) sewing machines. This spare part is installed in the lower cutting mechanism of the machine and works together with the upper knife to trim excess fabric edges during sewing.

It is designed for smooth and accurate fabric cutting, helping create clean overlock stitches and professional garment finishing. The knife is made from durable hardened steel for long-lasting performance in high-speed industrial sewing operations.

This part is commonly used in Brother 500 and 600 series overlock machines and compatible industrial serger machines.

The lower knife cuts fabric edges while sewing and helps produce neat overlock stitching. It supports continuous trimming during high-speed sewing and improves seam finishing quality.

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.