Extrema Ratio N.K.1 Black Knife, MIL-C N690 (04.1000.0123/BLK)
- N.K.1 Black is a knife with impressive effectiveness. Curved spine of the blade accommodates thumb or index finger depending on fighting style. Sheath can be worn around the neck, or optionally on a vest or belt, allowing knife to be used as a clinch pick
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Extrema Ratio s.a.s. di Chiostri M.&C.
Address: Via Travesa delle Ripalte 72/74/76/78 40 / P
Postal code: 59100
City: Prato
Country: Włochy
E-mail: info@extremaratio.com
Extrema Ratio s.a.s. di Chiostri M.&C.
Address: Via Travesa delle Ripalte 72/74/76/78 40 / P
Postal code: 59100
City: Prato
Country: Włochy
E-mail: info@extremaratio.com
This product is intended for use only by adults with knowledge and experience in handling sharp cutting tools. Improper use of the knife can result in serious injuries. The blade is extremely sharp and can easily cut through skin and tissue; therefore, extra caution should always be exercised while cutting, and hands should be kept away from the cutting edge. To prevent the knife from slipping, it is recommended to cut on a stable, non-slip surface and avoid excessive force, which may cause uncontrolled blade movement.
Leaving the knife on the edge of a table, countertop, or in easily accessible places—especially where children are present—poses a significant safety risk. The knife should always be properly secured after use, ideally by placing it on a stable surface or storing it in designated knife blocks, protective sheaths, or magnetic strips. The knife should never be used for tasks it is not designed for, such as opening cans or prying objects, as this can damage the tool and lead to dangerous accidents.
A dull blade increases the risk of injury, as it requires more force and is more likely to slip from the material being cut. Therefore, it is essential to sharpen the knife regularly to maintain optimal sharpness. Additionally, proper cleaning and drying of the knife are necessary to prevent corrosion and bacterial growth. Periodic inspection of the handle and blade is recommended to check for cracks, chips, or looseness. If any damage is detected, the knife should be repaired or replaced immediately.
When using the knife, focus solely on the task at hand—avoid talking on the phone, watching television, or other distractions while cutting. Ensure proper lighting in the workspace for better visibility and control. Please note that some countries or regions have laws restricting the ownership and carrying of knives. Before purchasing or using this knife, verify that its use is legal in your location according to applicable regulations.
Following these safety guidelines will help ensure safe and effective knife use, minimizing the risk of accidents and extending the lifespan of the tool.
N.K.1 Black (Neck Knife) is a compact knife with a monolithic Naked construction, made from a single piece of Böhler N690 steel. The model is equipped with a sheath designed for neck carry, attachment to a vest with the M.O.L.L.E. system, or optionally for belt carry.
It is an excellent knife with impressive cutting effectiveness, suitable for defensive and tactical applications, as well as for small, precise tasks. The wide blade and well-thought-out edge geometry make the N.K.1 perform well in precision cutting, light utility work, and as a compact element of tactical and outdoor equipment.
The profiled, curved recess on the spine of the blade allows comfortable placement of the thumb or index finger, depending on the preferred grip technique. This solution increases control over the knife during precise tasks and allows fast, confident handling in experienced hands.
The Kydex sheath offers multi-position mounting, allowing the knife to be worn around the neck using the included paracord or attached to a MOLLE system on tactical gear.
Thanks to its compact size, flat profile, and well-thought-out construction, the N.K.1 Black performs well in both tactical and everyday applications, offering reliability, functionality, and comfortable carry.
Naked - a minimalist construction without additional handle scales. The knife is made as a single steel frame, which allows it to maintain low weight, a flat profile, and high resistance to intensive use. The exposed steel handle emphasizes the technical, utilitarian character of the knife and makes it easier to keep clean. This type of construction works especially well in compact EDC knives, outdoor tools, and designs focused on simplicity and durability.
N690 - corrosion-resistant, high-carbon 1.07% (C), martensitic chromium steel 17.30% (Cr) with added molybdenum 1.10% (Mo), vanadium 0.10% (V) and cobalt 1.50% (Co) for structural homogeneity. Characterized by extremely high corrosion resistance and long-lasting sharpness. One of the best tool steels in the world. Achieves a hardness of 58 HRC. Manufactured by Böhler Edelstahl in Kapfenberg, Austria.
Blade - wide and solid with a thickness of 3 mm. Modified drop point with a cutting edge for extreme cutting performance. Plain blade with flat grind and black protective coating. A hollow on the back of the blade allows you to place your thumb or index finger on the blade for more precise work.
Handle - made of Austrian stainless steel Böhler-Uddeholm's N690Co. The specially designed, ergonomic shape of the handle prevents accidental injury when removing the knife from its sheath. The characteristic Extrema Ratio finger groove at the front improves the grip and creates a guard to prevent the hand from slipping onto the blade. Enlarged lanyard hole for attaching a leash or cord.
Sheath - made of Kydex plastic, allows quick access to the knife in any situation. Includes a paracord lanyard to hang the knife pouch around your neck. The pouch can also be attached under the straps of the M.O.L.L.E. system: to a tactical vest or any Extrema Ratio nylon pouch equipped with the M.O.L.L.E. system. In addition, it can be attached to a belt in combination with optional accessories.
Mounts (not included) - optional accessories from Extrema Ratio allow you to customize the carrying method to your needs. BELT-CLIP BLK (belt sheath attachment), UNDER SHIRT SYSTEM (concealed carrying attachment).
Technical data:
Product number: 04.1000.0123/BLK
Name: N.K.1 Black
Overall length: 129.0 mm / 5.1”
Blade length: 51.0 mm / 2.0”
Blade thickness: 3.0 mm / 0.12”
Handle length: n/a
Handle thickness: n/a
Weight: 56.0 g / 2.0 oz
Blade material: Böhler N690
Blade hardness: 58 HRC
Blade grinding: Flat
Blade finishing: BURNISHING MIL-C-13924 black coating
Handle material: Böhler N690
Handle finish color: Black
Sheath (holster): Kydex
Additional accessories: Paracord lanyard
Designer: Extrema Ratio
Brand: Extrema Ratio
Manufacturer: Extrema Ratio, Italy
Country of origin: Italy
Development: Sharg® company
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