Buck 840 Sprint Select Blue — Ultra‑Light EDC Knife with Rapid Ball‑Bearing Deployment

Meet the Buck 840 Sprint Select Blue—a refined, ultralight everyday carry knife built for daily reliability and instant response. Crafted with Buck’s American heritage in mind, this knife combines precision engineering with a smooth, fast opening system that feels effortless in hand and in pocket.

Speed and one‑handed control you can trust

The standout feature is the ball‑bearing opening paired with a responsive top‑flipper, delivering a silky, rapid deployment every time you engage it. One‑handed operation means you can slice through packages, trim rope, or prep a quick meal on the go without fumbling for a second hand. A sturdy liner lock secures the blade open for confident, safe use.

Steel that stays sharp longer

The blade is a satin‑finished 420HC steel—robust, corrosion‑resistant, and easy to sharpen. Buck’s heat‑treat approach (the Paul Bos method) enhances edge life, so your edge holds up under real‑world tasks. The drop‑point geometry offers versatile cutting performance—from delicate trimming to precise, controlled cuts.

Featherweight, ergonomic carry

Weighing just 3.2 oz (90.7 g) with a glass‑filled nylon handle in a vivid blue, this knife disappears in your pocket while delivering a confident grip when you need it. The deep pocket clip keeps it secure and ready without snagging on clothing or gear. Closed length is 4 3/8" (11.1 cm), making it genuinely pocket‑friendly for daily use.

Specifications at a glance

• Blade shape: Drop Point
• Blade material: Satin‑finished 420HC steel
• Blade length: 3 1/8" (7.9 cm)
• Blade thickness: 0.120"
• Weight: 3.2 oz (90.7 g)
• Handle: Glass-filled nylon — Blue
• Open/close system: Ball bearing opening with flipper
• Lock mechanism: Liner lock
• Carry: Deep pocket clip
• Closed length: 4 3/8" (11.1 cm)
• Origin: Made in USA

Who this is for

Ideal for urban commuters, outdoor enthusiasts, and everyday users who value a lightweight, American‑made knife with a premium opening system. If you want a dependable, low‑profile tool that vanishes in your pocket yet delivers confident performance when you need it, the Buck 840 Sprint Select Blue is built for you.

Practical use cases and care

From opening mail and packaging to quick field tasks, this knife shines wherever a compact, reliable blade is needed. To keep the satin finish and edge life at their best, wipe the blade regularly and keep it dry after use. A periodic light cleaning helps maintain the smooth action of the ball‑bearing system and the longevity of the edge.

Why Buck Knives stands out

With decades of American craftsmanship, Buck blends rigorous testing, durable materials, and trusted performance into every knife. The 840 Sprint Select Blue embodies that tradition—delivering a precise, dependable tool for daily challenges, engineered to perform when you rely on it most.