Benchmade 4170BK Fact Auto Folding Knife 3.95″ Black DLC Spear Point Blade – Aluminum / Carbon Fiber

The Benchmade 4170BK Auto Fact is an automatic folding knife with a 3.95 inch black DLC coated spear point blade, blending Italian stiletto heritage with modern everyday carry practicality. Benchmade’s 417 Fact reimagined the classic Italian stiletto as a contemporary tool, and the Auto version takes it one step further. Push button speed connects this modern folder directly to its traditional switchblade roots.

Few knives manage to look this classic and perform this modern. This one does both without apology.

What the Benchmade 4170BK Auto Fact Brings to the Pocket

The Auto AXIS mechanism is the headline. Press the button and the blade launches into the locked position, then the familiar AXIS bar closes it just as smoothly, giving you genuine one handed operation from either side. It is the fastest way Benchmade builds a folder and it feels every bit as solid as the manual versions.

The intended owner is the everyday carrier who wants speed, the professional who opens a knife one handed while the other hand is busy, and the enthusiast who appreciates the stiletto lineage. As Benchmade puts it, the Auto Fact is a perfect choice for enthusiasts and super spies alike. Slim, long bladed, and refined, the Benchmade 4170BK is a knife with real personality.

Key Features

• Auto AXIS mechanism for push button deployment and smooth ambidextrous closing
• 3.95 inch spear point blade with a slim, elegant stiletto inspired profile
• Premium S90V super steel prized for phenomenal edge retention
• Black DLC coating for a subdued, all business appearance and added surface hardness
• Aerospace aluminum handle with a sleek carbon fiber inlay
• Slim, rigid, and refined in the pocket despite the long blade

Specifications Explained

S90V is one of the premium powdered steels, an alloy prized for phenomenal edge retention that holds a working edge through prolonged use with low maintenance between sharpenings. The tradeoff is that it takes patience and the right abrasives to resharpen, which is a fair trade for how rarely you need to do it. If you cut a lot, this is the steel you want.

The black DLC coating gives the blade a subdued, all business look to match its performance, and it adds a hard, low friction surface that resists corrosion and wear. On a spear point profile with symmetrical grinds, that slick coating makes push cuts noticeably easier through dense material. It also hides use marks well.

Handle scales are aerospace aluminum dressed with a sleek carbon fiber inlay, keeping the knife slim, rigid, and refined in the pocket. Aluminum provides the stiffness that an automatic mechanism needs to stay properly aligned, while the carbon fiber adds texture and visual depth. At 3.95 inches the blade is substantial, so check the length rules where you live.

Deployment, Legality, and Care

Automatic knives are regulated differently from state to state and even city to city. Verify automatic knife laws in your area before ordering the Benchmade 4170BK, because possession and carry rules vary widely and it is entirely your responsibility to know them. When in doubt, check with local authorities rather than an internet forum.

Practice deployment deliberately at first. An automatic opens with force, so establish a consistent grip and keep your fingers clear of the blade path until the motion is second nature. Keep the button clean and free of pocket debris so it stays crisp.

Maintenance is simple: keep the pivot and mechanism clean, add a drop of light oil periodically, and avoid submerging the knife when you can help it. Sharpen with diamond or ceramic abrasives and strop between sharpenings. Add a pouch, a light, or a bag from our Apparel and Gear collection to round out your carry.

For a fast, handsome, seriously capable automatic, Benchmade built exactly the right knife here. Ships direct to your door, no FFL required.