Automatic Knife Release Form

f-18 form successfully submitted

A confirmation will be sent to your email shortly. You can find your signed form in your Account.

Please note, you cannot add to cart without signing the f-18 agreement

Stores Logos Stores Logos
  • 1800 SW Teton Avenue
  • Tualatin, OR 97062
  • Phone: 503-682-1966
  • Toll Free: 800-325-2891
  • Fax: 503-682-7168

Blade Edges & Grinds

About ZT edges

ZT pocketknives have two main types of edge, plain and partially serrated. The plain edge is also sometimes called a “fine” or “straight” edge; the majority of ZTs feature a plain edge.  Some ZTs offer a partially serrated edge.

Here are the advantages of each type and the best way to put each to use.

The plain edge

A plain edge is the edge style everyone is familiar with. The blade steel is ground and sharpened to a very fine point along one edge. The sharpened edge is a uniform width from the heel to the tip of the blade. Generally, the sharpened edge is visually lighter than the rest of the blade because the sharpening process also polishes the edge. All ZT knives are hand sharpened by our expert sharpeners.

The plain edge is a general-purpose cutting edge, the one most people need for daily tasks. From opening packages to breaking down cardboard to slicing up an apple for a snack, the plain-edged pocketknife is perfect for the job.


  • Multipurpose cutting
  • Excels at push cuts, slicing cuts, and precision work
  • Easy to care for
  • Easy to resharpen when needed
The plain edge. Described under the heading The plain edge.The plain edge. Described under the heading The plain edge.

The partially serrated edge

The plain edge is extremely useful, which is why most ZTs have a plain edge. However, there are times when a serrated edge is the right tool for the job. When cutting fibrous materials like rope or webbing (think seatbelts) or even when sawing through bits of wood or hide, the toothlike serrations can cut more quickly and efficiently. The partially serrated portion of the blade is sharpened on a single side, making the edge even sharper, while the serrations dig in to cut through the tough stuff.

ZT’s partially serrated blades combine the advantages of the plain edge with those of the serrated edge for the best of both worlds.


  • Added cutting versatility with both edge styles
  • Partial serration enables easy cutting of fibrous materials
  • Serrations stay sharper longer

While serrations do tend to retain their sharpness longer, when it comes time to resharpen, serrations take more effort and require special tools.

Partially serrated edge knife blade. Described under the heading The partially serrated edge.Partially serrated edge knife blade. Described under the heading The partially serrated edge.

About ZT grinds

The grind of a knife is how the knife blank is thinned and narrowed by grinding so that the blade becomes thin enough along the edge to cut with it. ZT uses two main types of grinds on our knives: flat and hollow.

For more info about other parts or aspects of a blade, see Knife Anatomy.

The flat grind

A flat grind is exactly what it sounds like: the blade is ground flat from the spine to the edge on both sides. In cross section, it would look like a triangle. ZT also puts an edge bevel on the blade, which forms the actual cutting edge.

The flat grind offers good cutting capabilities, strength, and depending on blade thickness, can also offer chopping abilities.

The slicer grind, designed by Rick Hinderer, is a type of flat grind used on some ZT knives made in collaboration with Rick. In this case, the blade grind tapers from spine to edge, but also from back of the blade to front. This enables to front of the blade to be an excellent slicer, while the thicker back part of the blade can be used for tougher push or draw cuts.

The flat grind illustration.  Described under the heading The flat grind.The flat grind illustration.  Described under the heading The flat grind.

The hollow grind

For a hollow grind, the blade is ground so that it is slightly concave on both sides of the blade. This thins the blade and enables a very thin, sharp edge, making this style of knife an excellent slicer.

Hollow grinds are useful on any knife that needs to be able to slice, making them excellent for every day carry. They are also often found on hunting knives for that same purpose. As with the flat grind, ZT also puts an edge bevel on our hollow-ground knives.

The hollow grind illustration. Described under the heading The hollow grind.The hollow grind illustration. Described under the heading The hollow grind.

ZT chooses blade edges and grinds based on the intended use of the knife, the knife’s design and materials, as well as manufacturing considerations. Learn about blade styles and profiles here.