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About Thread Kits Company
A Division of KATO Fastening Systems

Founded in 1984, Thread Kits Company is a leading global manufacturer and supplier of quality thread repair products for nearly 30 years. In 2016, KATO Fastening Systems, Inc. (KATO), the original inventor and manufacturer of the revolutionary bi-directional Tangless® Insert, has acquired Thread Kits, Co. from Herndon Products. We continue to do business as Thread Kits Co., Superior products, customer service & support remains the mission of KATO and Thread Kits. We are confident the synergy of this merger will enhance customer experience.

Thread Kits Company’s original product - Perma-Coil® - is a registered trademark name in the U.S and several foreign countries, and has become a recognized name in the automotive, industrial and production rebuilder industries. We have added other lines to compliment our Perma-Coil® line, including the very popular Time-Sert® and Big-Sert®. Even with the addition of our newest line Perma-Rivet®, our 50,000 square foot facility in Torrance, California has ample room to meet our customer needs. At Thread Kits Company, we pride ourselves on producing a quality product, with prompt, courteous service and providing our customers with reasonable prices.


Privacy Policy

In general, you can visit this web site without telling us who you are or providing any personal information. If you voluntarily provide information, we may use that information to send you products, promotions, services or additional information.

Thread Kits Company does not sell, share, trade, rent or allow others to use your information outside of Thread Kits Company. Your personal information is contained within a secured server and is only accessed by authorized employees who have access rights to such system.

All credit card information that is supplied by you is transmitted through a Secure Socket Layer (SSL) Encryption technology. As you enter your credit card information, it is transmitted in an encrypted (scrambled) form for added security. SSL protects information you submit via our web site such as ordering information including your name, address and credit card number.

If at any time you would like to be removed from our “e-mail” list, please contact us.


Shipping Policy

Most orders are shipped via UPS or USPS. Stock orders are usually filled and shipped within 24 hours upon receipt of order – Monday thru Friday – excluding Holidays.

Any backordered item(s) may delay shipping (usually 3 – 5 business days) and you will be informed of an approximate ship date.

Thread Kits Company reserves the right to cancel any order for any reason. The customer will be notified of any cancellation via email.

International Orders

International buyers are responsible for import duties, taxes and charges. These charges are determined by your countries customs office and are your responsibility. Where applicable, Thread Kits Company will ship via USPS International, which is fair and cost effective for both parties. Flat rate boxes are used when possible. Customs procedures can cause delays in shipping time and we are not responsible for those delays.


Return Policy

Unused item(s) may be returned within 7 days from the date received for full credit of the items(s) purchased at the buyer’s expense.

Shipping fees are non-refundable.

All returned items must be new, unused and in the original manufacture package.

You must obtain an RMA number (Return Authorization) from our company before sending any product back for credit. Packages that do not have an RMA# will not be received in.

Returns should be insured at your expense and sent prepaid, with the RMA# visible on the package to: Thread Kits Company, 24310 Garnier Street, Torrance, CA 90505.