Benchmade 4170BK Auto Fact AXIS Automatic Folding Knife

Overview of the Benchmade Auto Fact AXIS | 4170BK

The Benchmade Auto Fact 4170BK is the classic Italian stiletto completely reimagined as a precision-built American automatic folder. Manufactured at Benchmade's facility in Oregon City, Oregon, it pairs a 3.95 in. CPM-S90V spear point blade with the proprietary Auto AXIS mechanism, so you get one-handed deployment the instant you need it.

What sets the 4170BK apart:

• CPM-S90V super steel with black DLC coating holds a razor-sharp edge far longer than conventional stainless and resists corrosion with minimal upkeep
• Aerospace aluminum handle with woven carbon fiber inlays keeps the total package to just 3.11 oz., making all-day carry genuinely effortless
• Ambidextrous Auto AXIS button fires the blade open from either side of the handle with one downward pull, closed length of just 4.75 in.

Law enforcement officers, knife collectors, and tactical EDC enthusiasts who demand premium materials, instant deployment, and a slim pocketable profile will find the Benchmade 4170BK in a class by itself.

Key Features

• Blade Steel: CPM-S90V -- Premium American-made powdered metallurgy stainless steel hardened to 59-61 HRC. Substantially outperforms conventional stainless steels in wear resistance and edge retention, making it ideal for demanding use with minimal resharpening.
• Blade Coating: Black DLC (Diamond-Like Carbon) -- An ultra-hard, ultra-thin coating bonded directly to the blade surface. Resists scratches and corrosion, eliminates light reflection, and extends the functional life of the cutting edge.
• Blade Style: Spear Point (Plain Edge) -- A 3.95 in. needle-sharp spear point profile drawn from the classic stiletto tradition. Built for precision piercing and controlled cutting, with enough belly for utility slicing tasks.
• Auto AXIS Mechanism -- Benchmade's proprietary spring-loaded Auto AXIS fires the blade open 100 percent mechanically when the AXIS bar is pulled downward. The same bar locks the blade securely under load, providing a reliable lock without relying on a liner or frame.
• Ambidextrous Operation -- The Auto AXIS button is accessible from either side of the handle, making the knife fully functional for both left- and right-handed users with no reconfiguration required.
• Handle: 6061-T6 Aerospace Aluminum with Carbon Fiber Inlays -- Lightweight, rigid, and corrosion-resistant aluminum bolsters frame woven carbon fiber inlay panels. The result is a handle that is stiff, dimensionally stable, and visually distinctive without adding unnecessary weight.
• Deep-Carry Reversible Pocket Clip -- A low-profile clip seats the 4170BK deep in any front pocket so only the clip tip is visible above the pocket line. Reversible for tip-up or tip-down carry preferences.
• Slim Stiletto Closed Profile -- At 4.75 in. closed and 3.11 oz., this knife disappears into a trouser pocket, coat pocket, or uniform pants without printing or snagging.
• Benchmade LifeSharp Service -- Benchmade provides free sharpening, cleaning, oiling, and mechanical adjustment for the life of the knife. Send it in, and it comes back to factory spec.
• Made in the USA -- Designed and built at Benchmade's Oregon City, Oregon facility. The "BK" suffix designates the black DLC blade finish.

Specifications

Compatibility

The Benchmade 4170BK is a side-opening automatic knife. Automatic knife legality varies significantly by state, county, and municipality. Many states have relaxed or eliminated restrictions on automatic knives in recent years, but some jurisdictions still prohibit ownership, carry in public, or both. Before purchasing, confirm that automatic knives are legal to own and carry in your specific location. WCUniforms ships within the United States only, and the buyer assumes full responsibility for verifying and complying with all applicable local laws.

For maintenance and repair, the 4170BK uses Benchmade's standard torx hardware and is compatible with Benchmade's LifeSharp service program and Benchmade-specific replacement parts. The deep-carry reversible pocket clip fits standard front pockets in uniform trousers, cargo pants, jeans, and jacket pockets. This knife is not compatible with belt sheaths or MOLLE-style attachments without aftermarket accessories.

Intended Users

The Benchmade Auto Fact 4170BK is designed for anyone who demands premium materials, instant one-handed access, and exceptional carry comfort in a single folding knife.

Law enforcement officers who carry a secondary cutting tool for seatbelt emergencies, line cutting, or utility tasks will value the 4170BK's instant deployment, ambidextrous operation, and deep-carry clip that keeps the knife completely hidden until needed. Knife collectors and enthusiasts find the 4170BK compelling for its CPM-S90V super steel, black DLC coating, and the rare combination of a fully automatic AXIS-lock stiletto from a major American manufacturer -- a configuration that simply does not exist at this quality level elsewhere. Tactical EDC professionals, plainclothes officers, private investigators, and security personnel who need a low-profile tool that opens without hesitation in high-stress moments benefit from the slim closed profile and instant mechanical deployment. Military veterans and preppers who prefer proven premium steel and a reliable mechanism over budget alternatives will appreciate the LifeSharp warranty and USA manufacturing. Finally, civilian everyday carry users who want a refined, pocketable knife that does not look tactical on the outside will find the stiletto profile and carbon fiber aesthetics a perfect fit.

What's Included

• 1 x Benchmade Auto Fact 4170BK automatic folding knife (assembled and factory sharpened)
• 1 x Deep-carry reversible pocket clip (factory installed)
• Benchmade product information and warranty card

Note: No sheath, carrying case, or sharpening tool is included. The knife ships assembled and ready to carry.

Available at WCUniforms

WCUniforms is a specialty retailer focused on uniforms, tactical gear, and public safety equipment, serving law enforcement officers, first responders, and the professionals who depend on high-quality tools every day. Unlike big-box or general sporting goods retailers, WCUniforms curates products specifically selected to meet the performance standards of working professionals, and the Benchmade 4170BK Auto Fact fits that standard precisely. Unlike universal-fit folding knives built to a price point, the 4170BK delivers CPM-S90V super steel, DLC coating, and Benchmade's Auto AXIS mechanism in a Made-in-USA package backed by a genuine lifetime service program. Shop the Benchmade 4170BK and our full selection of tactical knives and EDC gear at wcuniforms.com.