Buck 040 Onset Framelock Folder Now Available

Buck Knives has announced the availability of the Buck 040 Onset: a ball-bearing framelock folding knife made with S45VN Steel. 

If you’re not familiar with Buck Knives, well…could be you’re living under a rock. Or maybe in a basement somewhere below Utquiagvik? 

Anyway. Check out this new drop-point folder. 

Buck Knives New 040 Onset Now Available

Buck Knives tells us, 

Sporting an S45VN Bos heat treated flat grind blade, ultra-smooth ball bearing flipper, G10 top scale, and removable belt clip, this framelock knife elevates the everyday carry game. Featuring a 3 3/8” drop point blade with an overall closed length of 4 7/8” and Rockwell hardness of 59-61, the Onset is built for the rigors of daily use, offering superior edge retention and rock-solid toughness.

New ball bearing framelock in S45VN Steel

The 040 Onset was developed through Buck’s commitment to continually expand and enhance their EDC (everyday carry) lineup. Building on nearly 120 years of knife-making expertise to develop and optimize products, the Onset is Buck’s newest EDC in an ever-expanding class that bears the trusted Buck name.

Chris Bourassa, Director of Marketing and Product Development at Buck Knives, says,

“Buck’s legacy of crafting iconic products, some over a half-century in continuous production, makes it easy to forget we have a state-of-the-art facility in which we design, develop, and test our products. The Onset is an exciting addition to our everyday carry class featuring a material and technical combination that’s tough to beat. Built, tested, and refined, every hand-edged and hand sharpened 040 Onset is proudly made right here in Post Falls, Idaho.”

The Buck 040 Onset folding knife was released in August, 2021


  • Satin blade made from CPM-S45VN with a cryogenic heat treat.
  • Flipper tab opener with a ball-bearing pivot.
  • Black G-10 handle textured for a sure grip.
  • Stainless steel frame lock.
  • Removable stainless steel pocket clip for right-side, tip-up carry.

Buck Knives Model 040 Onset Buck Knives Model 040 Onset, clip side, open Buck Knives Model 040 Onset Buck Knives Model 040 Onset, clip side, closed

Buck 040 Onset, Manufacturer’s Overview

Provided by Buck Knives

Modern, sleek, and tough, the Buck 040 Onset is the upgrade your EDC collection needs. With a black G10 handle this framelock pocket knife provides security and strength when in use. Ball bearings and a blade flipper ensure a smooth, one-hand opening, while a removable clip allows for easy carry. A full flat grind blade with Bos heat treated S45VN steel offers ultimate performance, capable of handling your everyday.

S45VN Steel
CPM S45VN is a newer, martensitic stainless steel designed to offer improved corrosion and wear resistance over other leading steels. The CPM (Crucible Particle Metallurgy) process produces a very uniform, high-quality steel defined by supreme stability, grindability, and toughness compared to those produced by other melting practices. The chemical components in S45VN utilize Niobium and Nitrogen in place of some of the Vanadium and Carbon to provide an excellent combination of edge retention, wear resistance, corrosion resistance, and toughness. These properties make it a solid choice for blades intended for heavy use, such as an everyday carry or work knife. 

The Buck Knives 040 Onset is Paul Bros heat-treated.

Ball Bearing Knife Technology
Ball-bearing knives are designed for smooth and efficient opening with a reduction in friction for rapid blade deployment.

An almost indestructible resin laminate that is resistant to heat, cold, chemicals, impact, and other abuse. These tough, durable qualities make G10 well suited for a knife that will get well used in extreme environments.

Frame Lock
A frame lock functions like a liner lock, but the locking mechanism is a section of the handle “frame”—on the side of the knife. The “frame lock” is a channeled lock arm that moves inward to lock against the blade when the knife is opened. Pushing outward releases it from its “locked position” so the user can close the blade. Benefits are fewer moving parts and lighter weight. Frame locks are typically 1-hand open, 1-hand close.

Made in the USA
At Buck, we are proud that this knife is made in the USA. The materials and workmanship involved in creating your knife will be done with the utmost care and will be free of defects.

Paul Bos Heat Treat
We are known for our blades. Buck Knives is a market leader in edge retention thanks to our steel selections and heat treat process pioneered by industry famous, Paul Bos, whose heat-treating system has proven to be the best in the business. Each blade is put through a rigorous heat treat process and quality performance test. It is then tempered to the appropriate Rockwell Hardness through a heating, freezing, and reheating system. This gives you longer edge life, ease of resharpening, and a blade that will not fail you.

Forever Warranty
We warranty each and every Buck knife to be free from defects in material and workmanship for the life of the knife, and we will repair or replace with a new knife, at our option, any Buck knife that is defective. Buck Knives does not warrant its products against normal wear, misuse, or product modifications. Buck Knives are not intended to be used as hammers, chisels, pry bars, or screwdrivers.



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