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The NIMBUS OPERATIVO is a combat knife celebrating a hand-to-hand battle in WWII. Extrema Ratio developed the Nimbus to commemorate the battle of Case Grizzano between the Italian paratroopers of Nembo and the German 1st Division Fallschimjager. This costly skirmish was hard won by the Nembo after a long battle. The Extrema Ratio Nimbus is designed to be a strong knife as well as a streamlined knife.


Beautifully shaped blade. Spear point with full tang and no serrations. Carefully designed to streamline it without decreasing its strength. Each side has a fuller that extends almost the full length of the blade. The Nimbus has a black finish that is very durable and protective. Non-reflective.


The Nimbus' handle is also streamlined and designed to give you a positive grip no matter how you hold your Nimbus. There is a substantial oval guard to protect your hand. Each side of the guard has a lanyard hole. The rounded butt end of the tang extends slightly beyond the handle end.


A combination sheath consisting of Kydex and Cordura. Plus a clip system for attaching the sheath. Can be carried on a belt. Designed to be minimal and light weight. Rides close to your body. MOLLE compatible.

Total Length of Knife: mm 263 (10.35 inches)

Blade Length: mm 141 (5.55 inches)

Total Length of Knife and Sheath: mm 288 (11.35 inches)

Weight of Knife: g 203 (7.16 ounces)

Weight of Knife and Sheath: g 334.52 (11.80 ounces)

Blade Thickness (Widest Part): mm 5 (0.20 inches)

Blade Thickness (Thinnest Parts): mm 3.01 - 5.08 (.12 - .20 inches)

Blade Width (Widest Section): mm 27.18 (1.07 inches)

Blade Steel: Bohler N690 cobalt stainless steel*

Blade Hardness: Rockwell 58 HRC

Blade Finishing: MIL-C-13924 Burnishing (black)

Grinding: Flat grind

Serrations on Blade: No

Handle: Forprene **

Handle Length: mm 116.84 (4.60 inches)

Sheath: A two section sheath made of Kydex and Cordura

MOLLE Compatible Sheath: Yes


* The blade is made with N690 cobalt stainless steel; a high performance steel with excellent cutting and sharpening characteristics. This steel is also used in the butchering industry and to make surgical instruments.

** The Forprene handle is resistant to extreme temperatures and moisture.

Availability: Usually ships in 2-3 business days

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