First Impressions of Kershaw Interval Fixed Blade Knife
The Kershaw Interval Fixed Blade Knife arrives with a promise: lightweight utility that defies its size. Marketed under the Project ATOM line by Kershaw, this knife aims to be a last-ditch, easy-to-carry tool for various tasks, balancing minimal weight with a usable form factor. Its most striking feature is, arguably, its construction – PA-66 nylon and glass fiber – moving away from traditional blade steel.
Having spent years evaluating knives designed for demanding environments, I approached the Kershaw Interval with cautious optimism. I needed an ultralight option for my backpacking kit, something that wouldn’t add significant weight but could handle basic cutting tasks around camp.
Upon unboxing, the Interval’s featherlight feel immediately stood out. The all-polymer construction is smooth, and the drop point blade, while not razor-sharp, does indeed have a distinct, sharp tip. Compared to my usual EDC fixed blade (a Benchmade Hidden Canyon Hunter) and a lightweight Morakniv Companion, the Kershaw sacrifices cutting power for portability.
My first impression was one of intrigue. It’s certainly a unique piece, but whether it’s useful remained to be seen. I was curious to find out how it performed in the field.
Real-World Testing: Putting Kershaw Interval Fixed Blade Knife to the Test
First Use Experience
I took the Kershaw Interval Fixed Blade Knife on a three-day backpacking trip in the Appalachian Mountains to truly test its mettle. The conditions ranged from dry trails to a brief, light rain shower. I used it primarily for food preparation (cutting cheese, sausage, and opening sealed packages) and some minor camp tasks, such as cutting cordage.
In dry conditions, the Interval’s lightweight nature was certainly appreciated, practically disappearing in my pack. However, cutting performance was noticeably inferior to a steel blade. Slicing tomatoes for lunch proved surprisingly challenging, requiring more force than expected. The polymer blade struggled with the tomato’s skin.
The grip, while adequate, became slightly slippery when wet. The knife is easy enough to hold, but there is nothing tactile about the polymer to aid with grip. After first use, I found myself wishing for a more aggressive texture.
Extended Use & Reliability
After several months of occasional use, the Kershaw Interval Fixed Blade Knife is still intact, although its limitations are more apparent. The polymer blade shows some minor scratches from cutting against abrasive surfaces. It has retained its sharp point, but the overall cutting edge does not seem to degrade.
Maintenance is incredibly easy: a quick rinse under water is usually sufficient. The PA-66 material seems impervious to rust, which is a plus. However, I’ve noticed that the edge is not capable of being resharpened using traditional knife sharpening tools.
Compared to my trusty Morakniv, the Interval falls short in terms of versatility and cutting power. It’s a specialty item, best suited for situations where weight is the absolute primary concern. The other blades have much wider use cases.
Breaking Down the Features of Kershaw Interval Fixed Blade Knife
Specifications
The Kershaw Interval Fixed Blade Knife boasts the following specifications:
- Manufacturer: Kershaw
- Blade Length: 3.5 inches
- Overall Length: 7.4 inches
- Blade Shape: Drop Point
- Blade Material: PA-66
- Designer: Kershaw Originals
- Serrated: Plain
- Knife Application: Fixed Blade
- Handle Material: PA-66
- Handle Color: Black
- Blade Thickness: 0.15 inches
- Sheath Material: No Sheath
- Weight: 0.7 oz
These specifications highlight the Interval’s design philosophy: minimal weight and ease of carry. The PA-66 blade material, while not steel, provides rust resistance and a degree of cutting ability. The lack of a sheath is a drawback.
Performance & Functionality
The Kershaw Interval Fixed Blade Knife’s performance is defined by its intended use case. For ultralight backpacking or situations where a minimal cutting tool is needed, it serves its purpose. It can cut cordage, open packages, and perform other light tasks, but it’s not a replacement for a traditional knife.
Its strengths are its weight and rust resistance. The weaknesses are its limited cutting ability and the lack of a sheath. It meets expectations for its intended purpose, but doesn’t exceed them.
Design & Ergonomics
The Interval’s design is straightforward and functional. The all-polymer construction is lightweight and comfortable enough to hold. The handle’s lack of texture detracts slightly from its ergonomics.
There is no learning curve. It’s a simple, fixed-blade knife.
Durability & Maintenance
The Kershaw Interval Fixed Blade Knife, due to its construction, offers moderate durability. The PA-66 material is resilient to rust and breakage under normal use, but it’s not as robust as steel. The lack of edge-retention can be frustrating.
Maintenance is simple, requiring only basic cleaning. The knife should last for a reasonable amount of time if used within its intended limitations.
Accessories and Customization Options
The Kershaw Interval Fixed Blade Knife does not come with any included accessories beyond its lanyard hole. It’s a very minimalist design. There are no real customization options for the Interval, given its all-polymer construction and lack of standard mounting points.
Aftermarket sheaths might be adaptable.
Pros and Cons of Kershaw Interval Fixed Blade Knife
Pros
- Featherlight weight (0.7 oz) makes it ideal for ultralight backpacking.
- Rust-proof PA-66 construction.
- Simple and functional design with a usable drop point blade.
- Inexpensive price point.
- Large enough to provide a secure grip for most users.
Cons
- Limited cutting ability compared to steel blades.
- No sheath is included.
- Cannot be effectively sharpened.
- Handle lacks texture, providing a slippery grip when wet.
- PA-66 construction is less durable than steel.
Who Should Buy Kershaw Interval Fixed Blade Knife?
The Kershaw Interval Fixed Blade Knife is perfect for: ultralight backpackers, thru-hikers, and anyone who prioritizes minimal weight above all else. It is also great for preppers or emergency kits where the user only needs a “just in case” blade.
Who should skip this product? Anyone who needs a robust, reliable cutting tool for demanding tasks, bushcraft enthusiasts, and users who prefer a traditional knife with a sheath.
A lanyard is a must-have accessory to improve grip and security.
Conclusion on Kershaw Interval Fixed Blade Knife
The Kershaw Interval Fixed Blade Knife is a niche product that fulfills its promise of being incredibly lightweight. It’s not a replacement for a real knife, but it is a viable option for situations where every ounce counts.
At its price point, it’s a reasonable purchase for those specifically seeking an ultralight cutting tool.
I would recommend it to a very specific type of user – the gram-counting backpacker or someone building a super-minimalist survival kit. If that describes you, then the Kershaw Interval could be a worthwhile addition to your gear. Just don’t expect it to perform miracles.