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Benchmade 9051BK AFO II Auto Knife, 154CM Black Blade

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The Benchmade AFO model was the first automatic platform ever by Benchmade and while it has experienced some upgrades through the years, the design and specifications remained almost unchanged. The AFO II side open automatic knife is a second generation model that is even tougher than the original--boasting an over-sized push button lock that is 30% stronger and a large 3.56" blade comprised of American-made 154CM stainless steel. This elite auto knife has an integrated spine safety, black anodized aluminum handles and a back spacer that protrudes to form a pointed pommel that can function as a glass breaker. This mode, the 9051BK, features a drop point blade in a black finish and a 4-way positional pocket clip allowing for tip up or tip down carry on either side. Finally, because of the size, this knife comes with a MOLLE compatible nylon sheath and malice clip for multiple carry options. Made in the USA.


  • Blade Length: 3.56"
  • Overall Length: 8.51"
  • Blade Material: 154CM Stainless Steel
  • Blade Finish: Black
  • Handle Length: 4.95"
  • Handle Material: 6061-T6 Aluminum
  • Weight: 5.8 oz.
  • Sheath: Nylon




Benchmade 9051BK AFO II Automatic Knife Review
Built for combat, the Benchmade 9051BK AFO II automatic knife is a second generation auto that builds and improves on the original design. The push button lock is 30% stronger than the original series and the black tactical blade is built of 154CM stainless steel. This Black Class knife is part of a large selection of auto knives from Benchmade Knives. The AFO II was built with the combat duty soldier in mind—but works great for anyone that needs a well built auto knife. If you are looking for a serious, no nonsense combat knife, the USA made AFO II stands ready for action.

The 154CM stainless steel blade sports a BK1 black tactical coat. The drop point blade features a standard edge. With a Rockwell Hardness of 58-60, this blade is going to perform admirably. Able to take an extremely sharp edge and hold the edge for a long time, 154CM isn’t so hard that it becomes onerous to sharpen. This is the perfect blade for active duty members of the Armed Forces and anyone that wants a hard working blade to get work done. The blade measures 3.56” long and has a thickness of .125”.
The handle on the AFO II is built from 6061 T6 black anodized aluminum. With a closed length of 4.95”, the AFO II is plenty big enough for even very large hands. With a nice finger choil and ample jimping on the spine and choil, the handle is plenty gripable. The handle also features three long grooves down the center that give it a great look and help wick water away in inclement working conditions.
The fire button stands proud near the very top right side of the handle. It is slightly oversized for easy access. When you push the button, the blade snaps out quickly like you would expect from a Benchmade.

The Benchmade 9051BK ranks very highly among combat knives. Built with all the right stuff, this sturdy auto knife has good action, tight lock up, and is beefy enough to get even the big jobs done. If you want a no nonsense, hard working automatic knife, the 9051BK AFO II is ready for you.


  • Afo

    Posted by DOUGLAS Kenworthy on Mar 15th 2021


    Fantastic piece great price

  • Nice EDC

    Posted by K Smith on Mar 12th 2021


    I have always loved Benchmade knives and have had this one on the wish list for a while. Great knife!!

  • Benchmade AFO 2

    Posted by Edward Davis II on Mar 10th 2021


    Robust well made, Great purchase

  • original AFO owner.

    Posted by Kevin Bruce on Mar 1st 2021


    Ive had an AFO since about 1994. Excellent performance for decades now. And the improved features make the AFO even better (except for the safety :)

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