We have made the difficult decision to suspend processing new warranty and sharpening shipments postmarked 08/01/2020 or later. However, we will continue to process all requests that have already been received. Any packages postmarked 08/01/2020 or later will be securely stored at our facility until our service team resumes normal operations. We are also temporarily suspending all ZT parts requests until further notice. We will frequently re-evaluate the situation over the next 30 days. Please check back here for the most updated information.

Warranty & Service Information

Thank you for choosing Zero Tolerance. From this page, you can request warranty evaluation, repair and sharpening service, and free replacement parts as well as premium ZT parts that are available for a small fee.


To ensure you get a lifetime of service from your ZT, our products are backed by a Limited Lifetime Warranty against manufacturing defects. In addition to supporting our products with this warranty, we will be happy to repair and sharpen your ZT knife for free when you send it in for warranty service.(If you have a broken ZT blade that is not covered by warranty, please see the information below.)

If you have questions about your warranty or how to take advantage of it, check our FAQs to see whether your question has already been answered. If not, just email our warranty team for more information.

Replacement Parts

To keep your ZT on the job, we are happy to provide a selection of free replacement parts as well as a selection of premium parts for which we charge a small fee. Please click on "Available ZT Replacement Parts" on the right of this page for a complete list.

Blade Replacement

In addition to the replacement parts above, we can also replace a broken ZT blade that is not covered by warranty for just $30. Please see the FAQs under Warranty Questions for details. To have a blade replaced, just add the $30 fee to your payment when you send in your knife and make a note in the “Reason for Service” box on the form. Not all blades are available at all times. If there is any issue with your request, the warranty team will contact you.

Free Sharpening

As a courtesy, we sharpen every knife that is sent to us for service. However, we know that some of you put a special edge on your ZTs. So, if you do NOT want us to sharpen your knife, just make a note in the “Reason for Service” box on the form.

Need More Information?

Click the arrows on the boxes to read our warranty, learn about replacement vouchers, counterfeits, available ZT replacement parts, and more.

General Information

Limited Lifetime Warranty

Zero Tolerance knives from Kai USA Ltd. carry a limited warranty for the lifetime of the original owner, except when stated otherwise. We guarantee our knives against manufacturing defects in material and construction and to perform as advertised when properly used and maintained. The Limited Lifetime Warranty is non-transferable and does not extend to normal signs of wear, rust, damage, or breakage due to improper use, improper maintenance, accidents, loss, or theft. This warranty is void on products that have been modified in any way. Any product we determine to be defective will be repaired or replaced solely at our discretion. To receive warranty repair or replacement, the owner must send the product to be evaluated by Kai USA Warranty Services in our Tualatin, Oregon headquarters. In addition to the provisions of this warranty, the owner may also have other rights that can vary by state. The Limited Lifetime Warranty does not apply to the TX Tool, Fire Starter, or Kershaw Oil. No other warranties are implied or expressed other than what is specifically stated here. Kai USA Ltd. reserves the right to determine what constitutes normal wear, improper use/maintenance, and modification.

We reserve the right to make changes to this warranty at our discretion and without notice.

Liability Disclaimer

Zero Tolerance knives are intended and sold for legitimate everyday carry, sporting, and/or culinary purposes only. The purchase, use, and ownership of knives are subject to a wide variety of federal, state, and local laws and regulations. Always comply with all laws and regulations in effect in your area. Due to the complexity and constantly changing nature of these laws and regulations, it is the responsibility of the buyer to investigate and comply with the laws and regulations that apply in his or her specific area. You, and not Kai USA Ltd., are solely responsible for any claims resulting from violation of these laws and/or regulations.


Knives are extremely sharp tools and should only be used or handled with the utmost care and caution. Any use other than cutting (such as prying or twisting) is considered misuse and abuse—and will void your warranty. Zero Tolerance Knives/Kai USA Ltd. is not responsible for any injuries resulting from misuse or abuse of the product.

Do not use any Zero Tolerance knife as a throwing knife or a stabbing device. Throwing knives and knives developed for stabbing have a distinctly different design and function. Zero Tolerance knives are not intended for throwing or stabbing; they are designed for cutting purposes only.

Replacement Vouchers

There may be cases when a Zero Tolerance knife has been evaluated and is eligible for warranty service, but may not be able to be repaired or replaced. This can be true with discontinued models for which we may no longer have parts or stock. In such cases, at our discretion, we will issue a voucher for the original Manufacturer’s Suggested Retail Price. The voucher value can then be applied to the purchase of a current-model ZT—directly from us. If you prefer to have your original knife returned instead of using the voucher, please call our warranty team toll-free: 1-800-325-2891. We will retain the knife for 30 days from the date the voucher is issued. If you do not call us to let us know by then, the knife will be recycled.

Counterfeit Knives
Counterfeit knives are a huge problem in our industry. If you send a counterfeit ZT in for warranty service, we will not service it and we cannot return it to you. Please help us fight this scourge by purchasing only from authorized Zero Tolerance dealers.
Available ZT Replacement Parts

To keep your ZT on the job, we are happy to provide these free replacement parts:

  • KVT bearing washers (for KVT manual opening knives)
  • Handle screw set
  • Pivot bold set
  • Pivot washers
  • Standard pocketclip set (see below for premium pocketclips)
  • Stop pin
  • Torsion bar (for SpeedSafe assisted opening knives)

However, many ZTs have premium parts that are more costly to manufacture and we must charge a fee for those replacement parts. Here are the currently available parts for which there is a fee:

• Pivot set—$15
• Spacer—$15

• Pivot set—$25
• Spacer—$15
• Clip—$15
• SLT hidden flipper tab—$15

• Pivot set—$10
• Spacer—$8

• Pivot set—$10
• Spacer—$15
• ZT logo medallion—$8

• Spacer—$8
• Filler tab—$8

• Pivot set—$10
• Spacer set—$5

• Pivot set—$10
• Spacer set—$8

• Pivot set—$10
• Spacer—$15
• Clip—$10

• Pivot set—$10
• Spacer—$10

• Pivot set—$10
• Spacer—$8
• Clip—$10

• Pivot set—$10
• Spacer—$15
• Clip—$15

• Pivot set—$10
• Spacer—$8

• Pivot set—$10
• Spacer—$8

• Clip—$15

• Spacer—$15

• Pivot set—$10

• Pivot set—$15
• Spacer—$15
• Clip—$25

• Pivot set—$10
• Spacer—$25

• Pivot set—$15
• Spacer—$20
• Clip—$20
• Custom thumb stud—$15

• Pivot set—$10
• Spacer—$8

• Pivot set—$25
• Spacer set—$10
• Clip—$15

To Request Free Parts

Please note: We can only ship replacement parts to the USA, Canada, and Mexico. If you are not in one of those countries, please contact the authorized dealer from whom you originally purchased your knife for information on receiving replacement parts.

Use the online Parts Request Form below. Please be advised that we do not stock all parts for all models at all times and we may not have parts for discontinued models. In addition, parts for Factory Special Series, Limited Edition, and Dealer Exclusive knives are very limited and might not be available for your knife. If there is any issue with your parts request, our warranty team will contact you.

To Purchase Parts With a Fee

Please call our warranty team toll-free: 1-800-325-2891. We will take your credit card information over the phone and send your replacement parts to you. You may also request free parts at the same time.

Request Warranty/Service or Parts

If you think your product may have a problem in its original material or craftsmanship, please send it in for evaluation. Review the shipping information and complete the Warranty/Service Form below.

Please include a $7 Return Shipping & Processing Fee when you send your knife in for service. This is a flat fee, no matter how many knives you send. Just add your credit card information to the Warranty/Service Form or include a check or money order (payable to Kai USA Ltd.) in the shipping box along with your knife and the completed form.

To request parts, please use the Parts Request Form.

Warranty Claim

How to Ship Your ZT for Service

To send in a Zero Tolerance product for evaluation and/or warranty service, including repair and sharpening, please read all the information on this page.

Then, fill out the Warranty/Service Form below. You can list multiple products on this same form. Print two copies of the form from this webpage or from the follow-up email you will receive. On one copy, add your credit card information or include a check or money order for the $7.00 Shipping and Processing Fee. Place the completed form, along with your check or money order, if using, in the shipping box with your knife. Save a copy of the form for your records.

Package the items safely. Please use a box; envelopes are not recommended.

Ship via a carrier with a tracking service. There must be a way to track your package through your carrier. Kai USA Ltd. cannot be responsible for your item/s unless we have confirmation that your package was delivered to us.

Please allow up to six weeks for processing, including delivery time.

IMPORTANT: We are not responsible for damage to or loss of items that are not properly packaged and shipped.

Packaging Information & Tips

Even dull knives can be dangerous—especially if not packed properly for shipping. We’ve received packages with blade tips that have pierced the cardboard box and boxes with great jumbles of knives just rattling around inside, cutting into each other. Please follow these easy tips for safe packing:

Do not place loose knives in shipping box.

loose Knives Image

Carefully wrap and package knives in box.

Packaging Knives Image

Tip #1: Sheath or wrap fixed-blade knives and kitchen knives. If the knife has a sheath, place it in its sheath. If not, wrap it in several layers of newspaper or bubble wrap, making sure to fully cover the tip. If you are returning more than one knife, wrap each knife individually, and then wrap them all together so that they won't roll around in the box, possibly causing damage to the blades or handles.

Tip #2: Make sure folding knives are closed, then wrap the closed knife in several layers of newspaper or bubble wrap. If you wish to keep your original box, please do not send it in with your warranty shipment. All boxes sent in with warranty shipments will be recycled.

Tip #3: Fill your box with packing material—such as packing peanuts, bubble wrap, or newspaper. Place a layer of packing material in the bottom of your shipping box. Then place the knives on top of the filler and, finally, add another layer of filler on top of the knives.

Tip #4: Include a copy of your completed Warranty/Service Form and keep a copy for yourself. Then close and tape your box according to shipper recommendations.

Shipping Internationally

Shipping From Canada

You must include our Warranty/Service Form (inside the package) AND the appropriate Customs Declaration Form required by US Customs and Border Protection (on the outside of the package). Your carrier will help you decide on the correct forms. For Canada Post, for example, you will need form CN22 or CN23.

To avoid unnecessary duty charges, under "Quantity and detailed description of contents" on the form, write the number of knives you are sending and note the description as "warranty service."

Mislabeled or mis-declared shipments can cause extended delays through customs. If you have any questions, contact our warranty team and they’ll be happy to help.

We reserve the right to refuse any package or to charge you—the sender—for any duties incurred by us for wrongly declared or undeclared packages shipped to our Warranty Department.

Information for Non-USA/Canada Customers

To make receiving warranty service for your ZT products simpler, please return them to the authorized retailer from whom you originally purchased them. Do not send them back to Kai USA. Only an authorized retailer will be able to support your warranty service. To ensure that you’re purchasing from an authorized retailer, please check our list of authorized distributors and dealers here. If a distributor is listed for your area, contact them to make sure the retailer you would like to purchase from is fully authorized. Thank you for supporting our authorized retailers.

Shipping Address


Kai USA Ltd.

Zero Tolerance Warranty Dept.

18600 SW Teton Avenue

Tualatin, OR 97062


Warranty Information For Our Other Brands

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