Locked filament polyester thread for high-speed sewing applications

Coats Ultimax is a high performance and natural-looking sewing thread, produced from polyester filaments that are interlaced by air pressure. It has a locked filament construction with higher uniformity and lower fault levels compared to spun polyester thread.

Ultimax is ideal for end use applications like bedding and mattresses. It utilises a sophisticated air jet technology to convert filament yarns to a multi-purpose sewing thread and eliminates the need for spinning and twisting processes which enables Coats Ultimax to exhibit excellent uniformity, regularity and freedom from imperfections.

It is a versatile thread which can be used in a number of operations such as lockstitch, chainstitch, and multidirectional stitching, providing better overall performance on automated straight or contour seamers where rethreading can be expensive .

Because of its low profile and oval cross section, the sewn seams created by Ultimax bed into the fabric enabling greater protection from abrasive surfaces. This couples with its uniformity and lower fault levels helps ensure consistently lower repair rates.

Learn more about Ultimax by downloading our product information sheet or by contacting one of our experts.


High levels of fastness in categories not listed above, e.g. chlorine bleach, can be produced as a special requirement.

Since conditions and applications vary considerably in the use of a product, the customer and/or user should assure herself or himself that the product meets end customer requirements and is suitable for the intended end use. Coats accepts no liability for unsuitable or improper use or application of products.

Information provided above is based on current averages and should be taken only as indicative. Coats accepts no liability for the preciseness and correctness of the information provided.

Product information sheets are updated from time to time, please be sure you are referring to the most recent publication. Coats supports customers with advice on individual applications on request; if you have any questions or concerns, please contact us.