The 9033A Aluminum Bobbin is a high-performance alternative to the standard steel bobbin, specifically engineered for the Pfaff 138, 234, 463, and 563 series. Manufactured by Seki (Japan), these bobbins are the preferred choice for high-speed industrial sewing where precision and weight reduction are critical for maintaining perfect thread tension.

By utilizing high-grade aircraft-grade aluminum, the 9033A provides a significant reduction in rotational mass. This allows the bobbin to start and stop more precisely than heavier steel versions, making it the ideal choice for machines equipped with automatic thread trimmers.

Key Features & Performance
Seki Japanese Engineering: Precision-turned from solid aluminum stock, ensuring absolute concentricity. This prevents "wobble" inside the bobbin case at speeds up to 6,000 RPM.

Ultra-Lightweight Design: The reduced mass significantly lowers "rotational inertia." When the machine stops suddenly, the aluminum bobbin stops instantly, drastically reducing the risk of "backlash" (thread overrun) and bird-nesting.

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.