Extrema Ratio Ontos Black
Since 1997, Italy’s Extrema Ratio has set the benchmark for professional-grade knives, and the Ontos Black exemplifies their relentless pursuit of excellence. Born from real-world feedback by elite operators and meticulously handcrafted in Italy, this survival knife fuses uncompromising strength with compact versatility. Whether you’re navigating dense underbrush, braving icy peaks, or executing a critical operation at dawn, the Ontos Black is engineered to perform when it matters most.
At first glance, its sleek black profile speaks volumes—no-nonsense, mission-ready design. Slip your hand onto the ergonomic Forprene® handle and feel its shock-absorbing comfort and rock-solid grip, even when wet or gloved. The full-tang Böhler N690 steel blade, hardened to 58 HRC, cuts through rope, wood, or bone with surgical precision, while the MIL-C-13924 burnished finish resists corrosion and reflection in low-light conditions.
Flip the knife over and discover a serrated spine engineered as a built-in backup saw—no more scrambling for tools when you need a secondary edge. At 299 mm overall and weighing just 411 g, the Ontos Black balances heft for chopping tasks with the agility you need for fine work. Its 6.3 mm thick spine stands up to prying and batoning, making planing wood or clearing debris effortless.
Designed to integrate seamlessly with modern gear, the MOLLE-compatible nylon thigh sheath stays firmly in place—even during high-speed retreats—so you never lose access to your blade. Tucked into its external pouch is a comprehensive survival kit: a water container with purification tablets, cordage, compass, candle, flint and striker, fishing kit, multi-tool, matches, sewing supplies, razor, signal mirror, whistle, snare wire, wire saw, pencil, plus a concise English-language survival handbook. A diamond-plate sharpener and 12-hour glow stick complete the kit, ensuring you’re never left in the dark.
Trusted by the Italian and French Armed Forces and backed by responsive customer support, the Ontos Black delivers battlefield-proven reliability at a surprising value. If you demand a knife that excels in kitchen chores, hunting camps, emergency rescue, or Special Forces missions, the Extrema Ratio Ontos Black delivers performance, durability, and peace of mind—all in one uncompromising tool.
Key Features and Specifications
- Blade Material: Böhler N690 stainless steel, 58 HRC – razor sharp, corrosion-resistant
- Blade Length: 168 mm – optimal balance of reach and control
- Overall Length: 299 mm – full-sized performance in a compact package
- Weight: 411 g – substantial feel without fatigue
- Spine Thickness: 6.3 mm – built for prying and chopping
- Finish: MIL-C-13924 burnished – non-reflective, wear-resistant
- Handle: Forprene® – ergonomic, shock-absorbing, secure grip
- Serrated Spine Section – emergency saw edge always on hand
- Sheath: MOLLE-compatible nylon thigh rig – secure carry, rapid deployment
- Survival Kit Included – water container, purification tablets, compass, flint & striker, fishing kit, multi-tool, matches, sewing kit, razor, mirror, whistle, wire saw, and handbook
- Extras: Diamond-plate sharpener, 12-hour glow stick
- Variants: Available in Black or Green
- Experience mission-ready craftsmanship—choose the Ontos Black.
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