Benchmade Infidel OTF Auto – 3.91″ D2 Black Dagger Blade, Aluminum Handle – 3300BK

The Benchmade Infidel 3300BK is Benchmade’s flagship double-action OTF automatic — a 3.91-inch D2 dagger blade that deploys and retracts from the front of the handle with a single slider, built to a tolerance standard that defines what a production OTF can be.

The blade is D2 tool steel with a black coating and a flat-ground double-edged dagger profile. D2 is a high-carbon, high-chromium semi-stainless steel that delivers exceptional wear resistance and edge retention — it holds a working edge longer under hard use than fully stainless production steels, at the cost of requiring occasional oiling to prevent surface oxidation. The double-edged dagger geometry provides equal geometry on both edges with a reinforced centered tip. The 6061-T6 aluminum handle is machined to tight tolerances — the Infidel’s reputation is built on a lockup and deployment feel that most production OTFs don’t approach. Double-action means the same slider deploys and retracts; no separate retraction button.

Note: Out-the-front automatic knives are subject to federal and state restrictions. Verify your local laws before purchasing.

• Blade Steel: D2 tool steel, black coated — high-carbon, high-chromium semi-stainless; exceptional wear resistance and edge retention vs. fully stainless production steels
• Blade: 3.91″ double-edged dagger, flat grind, black coated — centered tip, equal edge geometry on both sides
• Mechanism: Double-action OTF — single slider deploys and retracts; no separate retraction button; blade locks open and closed
• Handle: 6061-T6 aluminum, black anodized — machined to tight tolerances; defines production OTF build quality standards
• Deployment: Out-the-front automatic — blade exits the front of the handle; fastest deployment format available in a folding-style platform
• Clip: Tip-up, reversible — configurable for left- or right-hand carry
• Weight: 3.68 oz
• Warranty: Benchmade LifeSharp warranty — free lifetime sharpening, blade replacement, and mechanical repair

Specifications