Civivi Knives C20037B-1 Orthrus 3.76" Fixed Karambit/Straight Stonewashed

The Civivi Knives C20037B-1 Orthrus is a fixed karambit/straight blade that brings serious cutting utility to your EDC rotation or tactical kit. This isn't a folder you'll fumble with one-handed—it's a purpose-built fixed blade with a 3.76" cutting edge in Nitro-V steel, stonewashed for that subdued, working-tool aesthetic. The design straddles two profiles: a traditional straight edge for slicing and utility cuts, paired with karambit geometry for control and close-quarters work. If you're running a neck knife, ankle rig, or belt setup and want something that handles both camp chores and defensive scenarios, the Orthrus scales differently than mall-ninja aesthetics or mall-tier steel.

Build quality matters in fixed blades, and Civivi doesn't cut corners. The handle is G10—tough, textured, and built to stay put in wet or gloved hands. The finger ring integral to the karambit profile gives you positive control without relying on a traditional guard, and it's aggressive enough to feel substantial without being theatrical. At 4.30" overall with a stonewashed finish, this knife looks like it's been used for real work, which is exactly the point.

Nitro-V steel is Civivi's go-to for fixed blades where toughness and edge retention need to coexist. It's not a "super steel" in the hardness-focused sense, but it handles the real world—batoning, prying, repetitive cutting—without chipping or requiring constant stropping. The stonewash does more than look good; it hides fine scratches and wear that would show on polished steel, so your knife looks ready for the next job instead of beat up.

This is a working blade for hunters, outdoors people, and anyone who carries a knife because they use it. Not a display piece, not a safe queen.

Key Features

• 3.76" fixed blade combining straight-edge and karambit profiles
• Nitro-V steel stonewashed finish for durability and subtle wear aesthetics
• G10 handle with integral finger ring for secure, textured grip
• 4.30" overall length—sized for neck carry, ankle rig, or belt sheath
• Designed for both utility cuts and close-quarters control

Specifications

Frequently Asked Questions

What's the difference between a karambit blade and a straight blade?

The Orthrus combines both profiles. The karambit geometry (the curved profile and finger ring) gives you control and a secure grip for close work, while the straight-edge cutting section handles slicing, batoning, and general utility cuts. You're not locked into one technique; you get the benefits of both.

Is the Civivi Orthrus good for EDC or is it too specialized?

This is a fixed blade, so it's a full-time carry commitment—not a folder you pocket depending on the situation. If you run a belt knife or neck knife and want something that does real work in camp, afield, or on a rig, the Orthrus earns its spot. For lighter pocket-knife tasks, a folder might suit you better.

Will I need to sharpen Nitro-V often?

Nitro-V holds an edge reasonably well without requiring constant maintenance. It's designed to balance edge retention with toughness, so it won't chip or fail if you use it hard. When you do sharpen, it takes an edge readily and is easier to maintain than harder, more brittle steels.

What's included with the Orthrus, and do I need to buy a sheath?

We've provided the blade and handle specs here; for details on what ships with the knife and sheath options, check the product listing or contact our team.