Achter Knives PDA

TAD Edition
Purpose Driven
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The Achter Knives PDA (Personal Defense Axe) is a compact field tool with a wickedly aggressive profile. Developed to meet the requirements of the highest possible level of protection in a non-firearm package, the PDA is compact, concealable and immediately  accessible due to its unique sheath. Secured in an upside down belt sheath, the axe can be carried in and out of vehicles and even deployed while sitting. The Boltaron material used is harder to work but the end result is a sheath that exceeds Kydex in impact and weather resistance by a wide margin. Designed for left side carry the axe does not interfere with your primary side and, due to its 11” height, disappears under a lightweight overshirt.

The one piece AEB-L steel axe is expertly contoured for multiple gripping options including inverted use, where the protruding tang can be used as a compliance/standoff tool. The head itself slopes forward, reminiscent of a nordic design. The blade-to-handle angle makes sure that the blade hits in a piercing motion as opposed to a flat chop. The AEB-L steel has been expertly heat treated to 57 Rockwell Hardness to enhance toughness. The steel itself has been blasted, acid etched and tumbled to minimize glare. A treatment of Sno Seal is applied to protect it from the elements.

The handle itself is double wrapped in 850 paracord, offering 24 feet of high strength cordage if needed. The combination of the contours, double wrap, and Sno Seal finish applied to the axe guarantee a rock solid grip no matter where you hold it. 

Over ninety percent of Achter Knives PDAs find their way to small forward groups of the US Military for a reason. This is a rare opportunity to get one of these hand crafted masterpieces.


  • The AEB-L steel construction combined with a solid tang results in an axe that is nearly indestructible.

  • The khaki 850 paracord wrap offers 24 feet of cordage if needed. 

  • Unique in its size, the PDA is small, but incredibly intimidating psychologically. This advantage makes it useful for situations where carrying a gun for self-defense is not an option.

  • The bottom eject, inverted Boltaron scabbard has been designed for left side belt carry.

  • The tang protrudes through the paracord, acting as a compliance or stand off feature.

Behind the Scenes with Herman Achterhuis

Herman spent many years in varied first responder roles before taking up knifemaking. He compliments John Gray for starting him on his knifemaking journey. Herman’s previous experience and continued training and focus on high level self-protection have led him to craft tools that are sought after by elite professionals, due to their unique design elements forged from real world experience.

Due to the nature of custom tools , slight variations may occur. Item does not qualify for discount or promotion. Limited to one per household.

Limit of 2 per customer.

Due to the nature of custom items, slight variations may occur.

By placing an order with Triple Aught Design, you are verifying that you are over 18 years of age and are aware of all local, state and federal laws regarding the possession of, or the carrying of this product. Triple Aught Design shall be held blameless for any infraction of laws made by the purchaser.



Blade: AEB-L

Handle: Khaki 850 Paracord

Sheath: Boltaron Scabbard


Main Edge Length: 2.24" (5.71 cm)

Stock Thickness: 0.191” (.487 cm)

Handle Thickness: .831” (2.1cm)

Overall Length: 11.67” (29.64 cm)


Without Sheath: 16.9 oz (479.1grams)

With Sheath: 21.6 oz (614.2 grams)


Full Tang Axe

Heat Treated to 57 HRC

850 Paracord Wrap Handle w Sno Seal Finish

Blasted, Etched and Tumbled finish w Sno Seal Applied to Blade

Inverted Bottom Eject Boltaron Belt Sheath 

Labels & Logos

Lasered Triple Aught Design and Achter Knives  Logo on Blade 

Made in the USA

Made in USA