Designed from parameters given by former elite special forces members, the TX399 Knife is one of the founding members of our tactical collection.


The Double Lock System works with the knife’s Liner-Lock to not just make it safe, but double safe. When the blade is opened, the Liner-Lock automatically engages and locks the blade open, but when extremely rugged cutting is anticipated, the user can push the Double Lock switch forward. When in the forward position, the switch blocks the Liner-Lock from disengaging and thereby preventing the blade from closing on your hand. The safety detent-action is adjustable to your desired tension with a screw on the side of the knife.


✔ Utilizing our Double Lock technology, any operator can work with confidence knowing that the added safety prevents the knife from accidentally closing.

✔ It easily opens with one hand using a reversible thumb stud, and you can adjust the two position pocket clip to adapt to your carrying style.

✔  To operate, simply open the blade and push the switch atop the knife forward to engage the Double Lock and pull back to disengage. The knives still have a Liner-Lock to disengage as well to close the blade.

✔ With Coast’s commitment to quality, the TX399 Knife is backed by Coast’s lifetime warranty against defects in materials and workmanship.



Blade Type: Partially serrated 3.0” blade
Lock Type: Double Lock
Steel Type: 9CR18MOV
Blade Length: 3.9 IN / 9.9 CM
Overall Length: 9.0 IN / 22.9 CM
Length Closed:  5.0 IN / 12.7 CM
Weight: 3.7 OZ / 105 G

Note: Shipping charges shown in shopping cart are for continental USA only


Disclaimer: Knives are only sold to individuals who can legally purchase and own such items in the jurisdiction where they reside. When you order and purchase this merchandise, you represent that you are of legal age to purchase this merchandise and that this merchandise can be purchased and owned in your state, county, and/or city of residence. Fire-End & Croker Corporation does not represent or warrant that any specific purchaser may legally purchase, own, or possess the merchandise ordered. CHECK YOUR LOCAL LAWS!

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Coast TX399 Double Lock Folding Knife

  • Brand: Coast
  • Model: CST-20825
  • $30.99

Available Options

Delivery/Shipping Availability: Item ships directly from manufacturer. Approximate delivery in 1 week.

Tags: Coast TX399 Double Lock Folding Knife, Coast, TX399, CST-20825, knife, knives