Help on OSS vs. OSI

Discussion in 'Cold Steel Knives' started by Mark Spark, Sep 25, 2020.

  1. Mark Spark

    Mark Spark

    Jun 1, 2020
    My son, who knows little about knives, thought my SRK in SK5 steel was a dive knife and took it spear fishing. Naturally he didn't rinse it so the blade got rust spots in the week or so before I noticed it. When I called him out on it, he pointed out: 1 It has a rubber handle great for wet grip, 2 the sheath's strap is exactly the right size for a diving belt, 3 he found it in the garage with the snorkeling gear. Hard to argue with all that so I let it go.
    But it made me think. He's right about the sheath and handle, they are good for water. We could use a dive knife for my kayak and spear fishing. For spear fishing it has to do light duty fish cleaning and dispatching. Also psychological shark protection. For Kayak usage it just has to hang out in the emergency bag. It should be as stainless as possible and not too expensive. It looks like the AUS8 OSS or OSI would be a good choice.
    I hate ordinary dive knives because they're typically 440A and ridiculously thick behind the edge. But AUS8 is one of my favorite steels.
    Salt water will probably get under the handle and rust the tang, but I'm inclined to use it anyway just rinsing it well.
    Any suggestions on which one to get? From descriptions, the OSS is hollow ground and the OSI is flat ground. Can anyone confirm?
  2. jlauffer

    jlauffer Gold Member Gold Member

    Apr 11, 2016
    Not sure about the grinds, but the big difference is that the OSI is single edge and the OSS is double edge, so that may factor into the decision.
    jbmonkey likes this.
  3. The Whip

    The Whip

    Jan 28, 2007
    I don't know about current models, but the OSS used to have a bead-blast finish. It's been my experience that bead-blast knife surfaces are terrible about shedding water and therefore rust pretty easily. No matter which knife you choose, I would think that almost any other surface finish would be better for water use.

    jbmonkey likes this.
  4. jbmonkey

    jbmonkey Platinum Member Platinum Member

    Jun 9, 2011
    aus8 will do very poorly in salt water. over time you'll see that. these models are too large for fish cleaning use on a boat where space is limited and as a dive knife. large knives don't move well underwater.

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