Color me skeptical: New “NASA Knife” never needs sharpening.

Or so says the headline of the Daily Mail video below the jump. The accompanying article hedges it a bit using “almost” and “stays sharp 5 times longer”.

From DailyMailUK:

The knife is made from an ultra-hard alloy developed by scientists at the California Institute of Technology (Caltech) and has been tested by engineers at Nasa.

The cutting edge features a 25 degree angle (12.5 degrees on each side) which makes it a thinner blade than other knives, enabling a more precise cut.

The serrated blade becomes self-sharpening as new teeth are exposed through use.

In ordinary steel knives, the harder the knife is the harder it is to maintain and the edge chips easily.

However, this knife edge is harder than any steel yet it’s not brittle and resists rust.

The knife is the brainchild of California-based Habitat, which has spent several years developing it and claim it is twice as strong as titanium.

Chief executive Adam Ackerman said: ‘The knife’s cutting edge is made from a patented ultra-hard alloy that was developed by Caltech and tested by Nasa.

‘It’s twice as strong as titanium. Habitat has bonded it to a stainless steel knife body using our new patent-pending laser bonding technology.

‘This represents the first true innovation in knife-making in over 200 years.

‘With a Rockwell hardness greater than 70, the knife’s nano serrations give the blade unparalleled cutting performance.

‘The knife becomes shelf sharpening as new teeth are exposed through use.

The “first true innovation is 200 years” bit ought to be disqualifying from the get-go. Maybe this alloy is something truly special. Personally, I don’t like serrations on a kitchen knife other than one for cutting bread, but I will say the 25-degree blade angle is something I would like to try.

We have heard the “never needs sharpening” claim thousands of times, it is usually a crock of crap. When something seems too good to be true, it usually is. Just look at the Ming Tsai Aero knife, which made many of the same claims.

Knife Review: Ming Tsai’s Aero Knife Part 1 (now onto the destruction)

I picked up the Aero Knife up on a bit of a lark. I figured if it gave me a couple of posts worth of material then it would be worth it. I didn’t have high hopes for a $10 knife from an infomercial. By the time they are done paying their celebrity endorser and making […]


I know I said I would do some destructive testing, I did, but I never got around to a write up. I tried cutting through a piece of cinder block, and filed the teeth off in a matter of 30 seconds. It was relatively anti-climactic. I will look for picture tomorrow and post it if I can find one.



  1. Sam L. says:

    I think skepticism is in order here.

  2. Daniel says:

    Have had my REAL henkles chefs knife for over thirty years. A few swipes on the stone every six months “unless wife cuts cinder blocks. 😉

    Still looks new. Paid $60.??? in Houston Texas in 1983.

    Oh the KNASA !! Don’t need, can’t support!!

  3. Billy says:

    “The serrated blade becomes self-sharpening as new teeth are exposed through use.”
    Unless Arai Shakku made it, highly doubtful.

  4. cmeat says:

    they forgot to mention the application of regenerative shark teeth tekmology.
    my used insingo came today.

  5. VaqueroJustice says:

    This sounds a lot like the ” dendritic steel ” knives that were being touted some years back.
    A lot of similar claims.

  6. Bill says:

    I haven’t been able to track down a patent number under “Adam Ackerman”, “Habitat” or “Knasa Knife” or any combination of these.

    On their kickstarter they state that the coating is “bonded to a stainless steel knife” which makes me think it is some form of carbidization, or DLC like coating.

    If anyone can find a patent number, we will have something to go on…

    1. KF says:

      The description “developed by scientists at the California Institute of Technology (Caltech) and has been tested by engineers at NASA,” suggests it might be patent #9,211,564 or #9,101,979, both of which are Caltech patents developed under NASA contracts. Both mention suitability for use in knives.

  7. duro says:

    basically stellite composition. A blade made out of stellite will stay sharp until it goes completely dull. New carbides come in until they can’t anymore.

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Color me skeptical: New “NASA Knife” never needs sharpening.

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