Blood Grooves On Knives: What You Need To Know

How do blood grooves improve a sheath knife? Page 3
How do blood grooves improve a sheath knife? Page 3 from


When it comes to knives, there are a lot of terms and features that can be confusing for beginners. One such feature is the so-called “blood groove” or “fuller.” In this article, we will explore what blood grooves are, their purpose, and whether they really make a difference in the performance of a knife. Read on to find out more!

What are Blood Grooves?

Blood grooves, also known as fullers, are indentations or grooves that are typically found on the flat side of a blade. They run parallel to the cutting edge and extend for a certain length. Blood grooves can be shallow or deep, depending on the design of the knife.

The Purpose of Blood Grooves

Contrary to popular belief, blood grooves are not designed to allow blood to flow out of a wound more easily. In fact, the term “blood groove” is a misnomer. The real purpose of blood grooves is to reduce the weight of the blade without compromising its strength. By removing excess material, the knife becomes lighter and easier to handle.

Debunking the Myth

There is a common misconception that blood grooves are meant to prevent a stuck knife from getting “suctioned” into a wound. However, there is no scientific evidence to support this claim. In reality, the shape and design of the blade, as well as the angle at which it enters the target, play a much larger role in preventing sticking.

Improved Balance and Flexibility

Blood grooves also contribute to the overall balance of the knife. By removing material from the blade, the center of gravity shifts closer to the handle, making the knife feel more balanced in the hand. Additionally, the presence of a blood groove can enhance the flexibility of the blade, allowing for better control and maneuverability.

Does Size Matter?

One common question that arises is whether the size or depth of the blood groove matters. While deeper blood grooves may remove more weight from the blade, they can also weaken it. It is essential to strike a balance between weight reduction and maintaining the structural integrity of the knife. The optimal size and depth of a blood groove will depend on the specific design and intended use of the knife.

Types of Knives with Blood Grooves

Blood grooves are commonly found in certain types of knives, such as swords, machetes, and some hunting knives. These knives often have thicker blades and can benefit from weight reduction without sacrificing strength. However, blood grooves are not commonly seen in everyday carry or utility knives, as they are usually unnecessary for their intended purposes.


While blood grooves may not have the mystical properties often attributed to them, they do serve a practical purpose in certain types of knives. By reducing weight, improving balance, and enhancing flexibility, blood grooves can contribute to the overall performance and handling of a knife. However, it is important to understand that the design and craftsmanship of the blade play a more significant role in its functionality. So, the next time you come across a knife with a blood groove, you’ll know that it’s not just for aesthetics but serves a practical purpose as well.