ONTOS II S600 BLACK - ready for the wild

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**GENEROUS ADDITIONAL DISCOUNT WHEN YOU PAY WITH A US POSTAL MONEY ORDER OR A CHECK**

Please email us at customerservice@xtremeknives.com or call us at 800-470-9414 or 801-770-4466 for more information. This option is available only for USA customers and not available on our website.

ABOUT: The Extrema Ratio ONTOS II S600 BLACK is a high-performance fixed blade knife built for those who demand reliability — from back country explorers to casual weekend campers. Whether you're navigating forest trails, preparing camp, or dealing with the unexpected, this knife delivers consistent performance and lasting durability. With its advanced materials, ergonomic design, and trusted Italian craftsmanship, the ONTOS II S600 BLACK is a versatile tool made for bush craft, trekking, survival, and everyday outdoor use. Built to the same exacting standards used by professionals, it’s a knife you can rely on.

BLADE: At the heart of the ONTOS II S600 BLACK is a blade crafted from Böhler S600 high-speed steel, a premium material commonly found in industrial cutting tools. Cryogenically hardened to 64 HRC, it offers exceptional edge retention, hardness, and wear resistance, making it ideal for challenging environments. The blade is finished with the new EXP DARK Teflon-based coating, which enhances corrosion resistance and minimizes reflection. Whether you're processing wood, cutting rope, or handling camp tasks, the ONTOS II S600 BLACK delivers precision, control, and long-lasting cutting performance.

HANDLE: The ONTOS II S600 BLACK features a rugged green colored Forprene handle, engineered for a firm, non-slip grip — even in wet conditions or while wearing gloves. Its ergonomic shape ensures comfort during extended use, giving you complete control over the blade for both detailed tasks and heavier work.

SHEATH: The ONTOS II S600 BLACK includes a green Cordura thigh sheath, built for field readiness and comfort. Fully MOLLE-compatible, it mounts securely to backpacks, belts, or tactical gear for easy access. Designed for versatility and durability, it keeps your knife close at hand.

Weight g: 344 (12.13 ounces)

Blade Length mm: 167 (6.57 inches)

Total Length mm: 299 (11.77 inches)

Blade Thickness mm: 6 (0.23 inches)

Blade Material: Böhler S600 Steel (64HRC)

Blade Finish: EXP Dark with Teflon Base

Blade Grinding: Flat Edge

Handle Material: Forprene

Sheath Material: Corduara

ADDITIONAL INFORMATON

NOTE: Most Extrema Ratio knives are designed for many purposes except for use with food. While they are known for their versatility, durability and strength, they are not ideal for using with food. For food purposes, it's recommended to use knives specially designed for the task.