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Buck 040 Onset Folding Lockblade Knife, Black

SKU: BU0040BKS
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$189.99
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The Buck 040 Onset Folding Knife was designed to be a premium lockblade folding EDC (everyday carry) knife that is as tough as it is modern. A blade flipper makes this knife one-hand opening, and the full bellied drop point blade is strong and versatile.

The full flat grind blade of the Onset is made of S45VN Steel, which has the advantage of superior corrosion and wear resistance. The drop point shape of the blade makes it sturdy, and its full belly makes it thick and strong for even heavy tasks, while the angle of the blade slanting down to the tip helps prevent accidental punctures.

This versatile blade locks open when in use with a frame lock mechanism built into the handle frame on the side of the knife. This sleek locking mechanism cuts down on moving parts, and on weight. The channeled lock arm moves inward to lock against the open blade. Pushing it outward releases it so the knife can close securely.

The handle of the Onset is made of textured G10, an almost indestructible resin laminate resistant to heat, cold, chemicals, impact, and whatever else life throws at it.

Buck's exclusive Paul Bos heat-treating and testing process maximizes both edge retention and performance. The blade is hardened to a Rockwell Hardness of RC59-61 through a rigorous heating, freezing and reheating process.

Engraving: Up to 8 characters can be engraved on the blade of the Buck 040 Onset Folding Knife.

Features of the Buck 040 Onset Black Handle Knife:

  • S45VN Stainless Steel Drop Point Blade with Frame Lock
  • Machined Grip
  • G10 Heat, Cold, Chemical, Impact Resistant Handle
  • Satin Finish Stainless Steel Back and Pocket Clip
  • Removable Pocket Clip
  • Knife Made in the USA
  • Lifetime Manufacturer Warranty


Blade Length:
3.38 inches
Overall Length (Closed): 4.88 inches
Blade Thickness: 0.120 inches
Weight: 4.9 ounces


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