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Thread: Why I Love My CRK Umnumzaan: An In-depth Review w/ Pictures!

  1. #21

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    I had this concern myself. The O rings are polyurethane which is the material performance motor mounts for race cars are made of as it does not tear on a launch where as traditional motor mounts do. While it looks delicate, polyurethane is extremely tough and it will last a loooong time.

    Quote Originally Posted by giant1 View Post
    Great review, thanks for putting it together.

    I have not handled one as yet, my concern is with the rubber orings. A hard use knife that has orings which can be easily damaged and have no real long term life just does not sit well with me.

  2. #22
    Could you bring me up to speed on what CPMS35VN is? I developed a chronic pain condition and was out of all the news in the knife world and missed the development of new steels. Are CRK going to change their primary steel and stop S30V?



    Quote Originally Posted by RM579 View Post
    Thanks for the review. The ONLY thing from keeping me from getting an Umnum is because of wondering when it'll come out in CPM S35vn. Maybe I shouldn't bother waiting.

  3. #23
    Thank you everyone for the compliments

    Making that review became my Saturday project to help pass the time

  4. #24
    Join Date
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    WOW Zac! Now thats a labor of love! I can see now why you are such a fan of CRKs especially the Umnumzaan. After seeing this, its definitely on my "I Gotta Get Me One Of Those" list Great thread
    - Mike -

    "TILL THE WHEELS FALL OFF"

  5. #25
    sweet review!

  6. #26
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    I wanted one before... and well... I want one more now. Great review.

  7. #27
    Great review. Thanks for taking the time and I am sure you had a little fun doing the testing.

  8. #28
    cool review! I'll use mine seriously next week in the mountains during my holiday

  9. #29
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    Quote Originally Posted by NickZac View Post
    Could you bring me up to speed on what CPMS35VN is? I developed a chronic pain condition and was out of all the news in the knife world and missed the development of new steels. Are CRK going to change their primary steel and stop S30V?
    I don't really know what their plan is. They just seem to have made a few "special" ones using it, and may convert at some point: http://www.bladeforums.com/forums/sh...ighlight=s35vn

  10. #30
    If it is 57 on the hardness scale, I would imagine Mr. Reeve has it in mind for fixed blades although A2 is an awesome steel which IMO is one of the best FB steels as its tough and easy to sharpen...I love S30V but I'm sure when they find something that is better than it, they will use it.



    Quote Originally Posted by RM579 View Post
    I don't really know what their plan is. They just seem to have made a few "special" ones using it, and may convert at some point: http://www.bladeforums.com/forums/sh...ighlight=s35vn

  11. #31
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    Num edc

    I have been using an Um for about 4 mos. after 3 years of large Sebenza EDC. I gotta say, I love them both. I don't really have a favorite, both of them are perfect for anything I've ever asked them to do, Bart

  12. #32
    Made me look at my umnumzaan with an even NEWER light

    Now I won't worry about pampering it so much

    Great review, tons of pics and a lot of explanation.
    Texas Peace Officer
    EDC: Custom SAK Pioneer "Policeman" and Ruger LC9
    Go Outside, we'll be here when you return

  13. #33
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    You used a $400 folder as a stake!

    You got brass ones my friend....

    Great review. I would not subject a new $400 folder to that degree of abuse. I usually baby my new ones for at least 6 months before I cut something serious.

  14. #34
    You only live once and this thing is made to be used. Furthermore, I really enjoy using it for everything. It has the thickest blade I have ever owned on a pocket knife and it batons as well as a smaller FB

  15. #35
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    Well, that is great to hear. I've decided to make this my next project. Now I just have to scrape up the simoleans or maybe luck into a good trade.

    Thanks for your contribution!

  16. #36
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    Zac, I have just obtained an Umnumzaan with my decision solely based on this review and our small talks. Then I bought a Small Sebenza. Just what I needed I gotta stop looking at threads like this
    - Mike -

    "TILL THE WHEELS FALL OFF"

  17. #37
    It's great to hear this review has helped people with their decision!!! Thanks much everyone!

  18. #38
    Lets Keep this Thread Flowing...

    FOLLOW UP; August 3rd, 2009

    Well, today was my birthday and I couldn’t help but think “what could be better than writing a follow-up to this review?”. If anything, I have grossly understated the capability of the Umnumzaan. The knife has, is and will continue to perform spectacularly. Edge retention on this blade is fantastic, largely due to edge geometry as it seems this knife holds an edge longer than other S30V blades which have a higher Rockwell Hardness Number. If you use this knife to saw through thick cardboard, you will find there is little resistance and the hollow grind goes through it like a hot knife through butter. The knife has been able to tackle every task it has ever been presented without breaking a sweat. The Umnumzaan has the ability to tackle tasks that were once reserved for fixed blade knives only and doing these tasks with a folder was cutleryicular suicide. Overall, this knife is still the most badass folder on the block and whether you want a knife that can tackle the heaviest utility work out their or if they want a folder which works well for personal protection, the Umnumzaan delivers. Hooray Umnumzaan!!! There are a few things I wanted to address as I have seen them come up in question a few times and I want to take a moment to clarify.


    The Rubber Rings on a $400 Knife?!?! Huh?!

    The first thing I wanted to add to is regarding the ‘rubber’ or ‘plastic’ rings on the knife. These rings are not made of cheap rubber or plastic. In fact, they are made from a material which is one of the strongest on earth; polyurethane. Polyurethane is used in motor mounts on race cars when traditional mounts are torn from high amounts of torque. Many people have expressed skepticism in this for a $400 knife which I understand, but it is important to remember that despite looking like the washers will tear, they are made of one of the most durable shock absorbing materials known to man. Also, keep in mind that:
    1) the correct functioning of the Umnumzaan is NOT dependent on these washers. It will still lock open safely with no blade play even if both washers are removed
    2) the washers MUST be a softer material because they are absorbing the shock of the blade when being flicked open. If it was not a material that absorbed shock, there would be no reason to use the Hawk Shock Absorber. Of all shock absorbent material which could be used in this application, polyurethane is by far the most durable.
    3) the washers can be replaced

    In an earlier post, I discussed the polyurethane washers:
    “I understand the initial skepticism. I first thought they were a cheap washer or plastic insert. Upon digging deeper, I found out that the materials these washers are made of is Polyurethane...it is the same material used in motor mount inserts on cars which launch from a dig (from not to moving such as drag racing) when traditional motor mounts tear on a regular basis. My buddy and I were running motor mount inserts made of a variety of materials and we would tear them on a rather regular basis. After going to these mysterious rubber (Polyurethane) inserts, we practically never tore them at all. Polyurethane offers both durability and flexibility which few metals are capable of matching as they are either not durable enough or not flexible enough. Polyurethane is an exceptionally strong material and I do not foresee you being able to tear it. I've batoned wood in which the sharper wooden edges make friction contact with the Polyurethane washer and I have also used it while cutting other metals and sharper edges did not harm it at all either. Mr. Reeve would not use it on his flagship folder if it was anything other than practically indestructible. If it did not have the durability capable of matching the rest of the knife (which has a thicker handle and blade than the large Sebenza and has a much beefier pivot design and refined lock), then it would not have been used on the Umnumzaan. I would definitely not let it prevent you from getting one as I think this is the best folding knife ever made in both design and implementation.”

    A final thing about the Hawk Shock Absorbing System is that by having the polyurethane create pressure between the base of the blade and the titanium handle, you now have insulation from shock which is not used on many knives. I have read this is a huge advantage for a folder you may hack with as it reduces vibrations that could break the blade off at the base.




    The Speed of the Umnumzaan

    Some people have said that the Umnumzaan is a slow knife. Like any manual folder, the speed of opening the blade is dependent upon the user. I can open this knife faster than any automatic or assisted knife on the market. Due to the redesigned lanyard system, I can also physically reach into my pocket, pull out, and obtain a good grip on the Boss MUCH faster than other pocket knives. Overall from when you would scream GO! And you reach, grab, remove and open; the Umnumzaan is as fast as any folder, manual, auto, bali, or assisted. Like all knives, you can increase your speed of drawing and deploying by practicing. The bottom line is there are no limitations on the speed of this knife. For me, this is actually my fastest folder as it fits my hand better and the larger thumb studs and lanyard give me a better jump.




    Sebenza or Umnumzaan: Which Knife is Better?

    The term better is subjective. There is no better and there is no worse, only preferences. With that said, tough and durable are not subjective. The Umnumzaan is a stronger and tougher folder than the Sebenza. This is because:
    1) The blade thickness of the Umnumzaan (.14 inches) is greater than the Sebenza (.125 inches for Large and Small). For a folding knife, a .14 inch thick blade is a very, very large thick of steel.
    2) The handle thickness of the Umnumzaan (.15 inches) is greater than the Sebenza (.125 Inches)
    3) The lock is a second generation Reeve Integral Lock and uses a larger pivot
    4) The Umnumzaan uses the Hawk Shock Absorbing System, allowing it to be opened harder and used harder with a lesser risk of damage (I am NOT implying you can abuse your knife and be alright however as ALL knives are limited by the laws of physics and common sense)

    Now, the above does NOT make the Umnumzaan better. The Umnumzaan is:
    1) Heavier than both Sebenzas
    2) Not customizable
    3) Has a lock which is more difficult to disengage than the Sebenza 21
    4) Available in double thumb lug only which for some people is an unnecessary war on their pants




    Varying Hardness of Earlier versus Current Umnumzaan

    You will notice if you look at birthday cards for the Umnumzaans that earlier ones had a S30V blade hardened to 55-57 and the most recent ones are hardened from 58-59. I am assuming this was just CRK testing the blades to see which ones they like to use most.

    With that said…supposedly, Chris Reeve made some of the Umnumzaans in CPM-S35VN which is also hardened to 55-57 so the earlier Umnumzaans reportedly in S30V may be in S35VN. There are two known Umnumzaans with a ‘Mystery Steel’ being used on them and they are the ONLY two Umnumzaans with computer generated graphics and sell for around $2,000 USD each.



    The Specs of the Chris Reeve Folders Side by Side

    Sometimes it is best to be able to see the numerical specs on paper so here is a comparison so you can decide which size and style knife is right for you
    Umnumzaan
    Overall Length: 8.45 inches (214.63mm)
    Blade Length: 3.675 inches (93.35mm)
    Blade Material: CPM-S30V hardened to 55-57 OR 58-59 RC
    Blade Thickness: .140 inches (3.56mm)
    Blade Shape: Unique Hollow Ground, Modified Clip Point w/ top swedge grind and top recurve
    Handle Length: 4.77 inches (121.16mm)
    Handle Material: 6AI4V Titanium
    Handle Thickness: .150 inches (3.81mm)
    Handle Grip: Checkering on the titanium on each side
    Weight: 5oz (141.75 grams)
    Opening: Double Lug Thumb Stud only
    Fittings: 303 Stainless Steel
    Carry Options: Titanium Pocket Clip, Calfskin Pouch
    Available Models: Right Hand, Left Hand, Right Hand Tanto Model from True North Knives only
    Customizable: No; 25 prototypes in existence however which differ slightly from the production model, 2 customized ones in existance

    Large Sebenza 21
    Overall Length: 8.335 inches (212mm)
    Blade Length: 3.625 inches (92mm)
    Blade Material: CPM-S30V hardened to 58-59 RC
    Blade Thickness: .125 inches (3.175mm)
    Blade Shape: Hollow Ground, Modified Clip Point
    Handle Length: 4.71 inches (119.634mm)
    Handle Material: 6AI4V Titanium
    Handle Thickness: .125 inches (3.175mm)
    Handle Grip: Smooth Titanium, Textured Titanium, Wood Inlay or Micarta
    Weight: 4.7oz (133 grams)
    Opening: Single or Double Lug Thumb Studs
    Fittings: 303 Stainless Steel
    Carry Options: Titanium Pocket Clip, Calfskin Pouch, Leather Sheath, Numerous Aftermarket Sheaths
    Available Models: Right Hand, Left Hand, Limited Tanto Model
    Customizable: Yes; Wood Inlays, Micarta Inlays, Custom Graphics, Unique Graphics, Computer Generated Graphics, Graphics all done by anodizing the Titanium, Damascus blades

    Small Sebenza 21
    Overall Length: 6.875 inches (175mm)
    Blade Length: 2.94 inches (75mm)
    Blade Material: CPM-S30V hardened to 58-59 RC
    Blade Thickness: .125 inches (3.175mm)
    Blade Shape: Hollow Ground, Modified Clip Point
    Handle Length: 3.935 inches (99.949mm)
    Handle Material: 6AI4V Titanium
    Handle Thickness: .125 inches (3.175mm)
    Handle Grip: Smooth Titanium, Textured Titanium, Wood Inlay or Micarta
    Weight: 3oz (85 grams)
    Opening: Single or Double Lug Thumb Studs
    Fittings: 303 Stainless Steel
    Carry Options: Titanium Pocket Clip, Calfskin Pouch, Leather Sheath, Numerous Aftermarket Sheaths
    Available Models: Right Hand, Left Hand, Limited Tanto Model
    Customizable: Yes; Wood Inlays, Micarta Inlays, Custom Graphics, Unique Graphics, Computer Generated Graphics, Graphics all done by anodizing the Titanium, Damascus blades


    Mnandi
    Overall Length: 6.375 inches (161mm)
    Blade Length: 2.75 inches (69.5mm)
    Blade Material: CPM-S30V hardened to 58-59 RC
    Blade Thickness: .090 inches (2.3mm)
    Blade Shape: Hollow Ground, Modified Clip Point, polished
    Handle Length: 3.625 inches (92.075mm)
    Handle Material: 6AI4V Titanium
    Handle Thickness: .125 inches (3.175mm)
    Handle Grip: Wood Inlay
    Weight: 3oz (85 grams)
    Opening: Single or Double Lug Thumb Studs
    Fittings: 303 Stainless Steel
    Carry Options: Titanium Pocket Clip, Calfskin Pouch, Leather Sheath, Numerous Aftermarket Sheaths
    Available Models: Right Hand
    Customizable: Yes; Wood Inlays, Bone Inlays, Gold, Titanium, Damascus Blades




    Now save your money so you can get one too!!!!!

  19. #39
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    Just wanted to add that Polyurethane revolutionized skate board wheels in the 70s. Their tough properties is literally "where the rubber meets the road". Very tough stuff with regards to abrasion resistance. Also the donuts actually rotate/freewheel on the Umnanzaan's thumb studs, so the same area on the Polyurethane donuts do not repeatedly make contact on the same spot. The superior material and freewheel feature should = longevity. Just my .02
    - Mike -

    "TILL THE WHEELS FALL OFF"

  20. #40
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    Great followup Nick.

    I have my Umnum now for about 1 month and it has taken over lead spot in the rotation.
    As for the dual lugs with polyurathane rings, I like them. They don't snag on the pocket since they are rounded and also sit tight to the frame. The rubber o-rings add greatly to the purchase of the thumb and assist in a quick opening.
    These lugs also do not rip up your thumbs!

    For me, the Umnumzaan combines classy looks with the confidence in knowing that it can stand up to some heavy duty chores.
    I still love my Sebbies, but this folder kicks it up a notch.
    And that's quite an accomplishment!

    dave
    stay alert/stay alive

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