Zero Tolerance 551

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Oct 5, 2006
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Zero Tolerance 551 Review - Part One

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Introduction

I recently received a Zero Tolerance 551 as part of a pass around here. Thomas W. and the fine folks at Zero Tolerance (ZT) made the knife available and Morrowj_98 organized the pass around. I have been a BladeForums member for over five years and I’ve never seen anything like the fanfare around the 550/551‘s release. The initial thread announcing the Hinderer/ZT collaboration has an incredible 2,500 posts!!! Moderators shut down that huge thread and the continuation now has over 1,900 posts.

The 551 was the first Zero Tolerance/Hinderer collaboration to be produced. Model 550 was slated for production, but has been delayed. Since then, a 560/561 flipper model has been announced and went on to win the 2011 Blade Show Collaboration Award. The enormous interest in the 551 grew from three things:

  1. rock star designer Rick Hinderer;
  2. exotic Elmax supersteel; and
  3. Zero Tolerance’s reputation for rock solid knives and customer service.
Rick Hinderer

Rick Hinderer is a volunteer firefighter who handcrafts knives and is best known for his XM-18 folder like the orange one below. The knife has been featured on the cover of Blade magazine and is in such high demand that Rick only takes orders from police, fire, and military personnel. He also sells through dealers, but his knives are typically sold on a pre-order basis before they even reach the dealer. Dealers typically sell the XM-18 for a premium above Hinderer’s normal $385 asking price. Demand is so high, however, that some dealers have closed their waiting lists and it isn’t unusual to see XM-18s sell for $650 or more on the secondary market.

Formerly, the only other Hinderer designed options for those unable to find an X-18 for sale, or uninterested in buying one at secondary market were from Gerber Legendary Blades. One is a rescue multi-tool. The other is the CLS, or “Combat Life Saver.” Gerber’s reputation for quality is a little spotty, however, and the company’s Hinderer models are built with pedestrian materials. When Zero Tolerance announced the 551 at an MSRP of $250 with a 6Al4V titanium frame and Elmax blade steel, it seemed to many that the affordable XM-18 might finally have arrived. The ZT 551 design, however, seems to have more in common with Hinderer’s custom “Camp Knife.”

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Size & Weight

The first thing you notice out of the box is the ZT 551’s size and weight. It isn’t the longest knife out there, but it is a brute. The closest comparison is with a Strider SNG. Here’s how it compares to that knife and some of my favorite heavy-duty folders:

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Zero Tolerance 551 Review - Part Two

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Elmax Blade

The ZT 551‘s blade is ground from Böhler Elmax steel. Böhler describes the steel as:

“A through-hardening corrosion resistant mold steel made by powder metallurgy processing techniques. The high wear resistance makes Elmax suitable for long production runs; e.g. electronic parts.”

I have never owned an Elmax blade, but user reports here at BladeForums indicate that Elmax may hold an edge like carbon steel with the corrosion resistance of stainless. As you can see in the photo, the pass around blade came to me with two nicks in the edge, but I have no idea what previous users did with the knife.

The 551‘s drop point blade is .15 inches thick and 1.25 inches wide. Unlike most Zero Tolerance models, the blade has an uncoated stonewashed finish. It opens via two large thumb studs without the benefit of a flipper or SpeedSafe system. The thumb studs also act as a blade stop when open. There is conventional blade stop built into the handle that comes into play when the folder is closed. The hollow grind is a work of art. It looks more like a blade designed for general utility than a slicer, but I'll report back after I use it for a few days.

I found that the knife opened smoothly, but the detent is stronger than that found in the average folder. You can flick open, but not as easily as some knives. You might need a little wrist action. As the blade rotates, a small finger guard moves into place. Chunky crenellations on the thumb ramp help maintain grip.

Handle

The ZT 551's handle features Torx screw construction. It is composed of a G10 scale reinforced by a skeletonized steel liner and a bead blasted 6Al4V titanium scale separated by beefy hourglass-shaped standoffs in an open back design. The black G10 is machined in a brick pattern that enhances grip. It looks more attractive in person than the online photos reveal.

At .18 inches thick, the titanium scale on the lock side is the stoutest I've seen in a folding knife. It is bead blasted, plain, unadorned except from some jimping toward the butt end, and a little bit slippery. A Hinderer lock bar stop stabilizer (duh) is used to limit excessive travel in the lock bar. The steel clip is a simple ZT style than can be reversed for tip up/tip down or right/left carry. The clip in the pass around knife was overly tight. A lanyard handle is also pre-drilled in the 551.

The handle shape is blocky, but ergonomic with an index finger groove up front and a curve toward the butt end. I have size XL hands and I can get all four fingers on the handle comfortably. The whole package is thick enough that it has the feel of a fixed blade hilt. The butt end is squared off and with the heft of the knife, it could be useful for hammering tent stakes and the like.

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Zero Tolerance 551 Review - Part Three

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Fit & Finish

The initial shipment of 551s had some quality control issues. Some of the skeletonized steel liners weren't finished properly and showed rust. The pass around knife, however, seemed nearly perfect. The blade was centered, the surfaces fit flush, the lockup is solid, and the lockbar travels to about 50% of the tang. There was some outcry in the announcement thread about the lockbar cutout being a little too shallow, but it doesn't seem to be an issue. I think the cutout just looks a little shallow in comparison to the extra thick scale. I measured the thickness of the titanium at the cutouts and found the 551's .03" thick cutout to be comparable to the Kershaw Junkyard Dog Titanium and the Strider SNG at .03" each. The cutout on the Kershaw Volt, however, is a little thicker at .04", as is the Chris Reeve Sebenza at .05".

The lock is among the stiffest I've handled. Part of that may come from the thick pocket clip that puts its full tension directly on the lockbar. The lock is a little sticky, too, but I haven't had to use a quarter to open it, like one user describes below.

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There is some very slight up and down blade play in the 551. If you grab the blade and push hard, the lock bar moves a little. There is no discernible side to side blade play. It is similar to what I've found on my Striders and less than I've found on my CRKs (which don't move at all.) The blade came scary sharp, but I'm not sure if I should thank the factory or the last pass around participant.

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In Use/Conclusions

After a week with the knife, I've reached a few conclusions: the ZT 551 carries like a brick in suit pants or shorts; the knife feels good in the hand (like a Strider); it is an excellent chopper/subpar slicer; and the knife is a little plain for all the hype. Its looks are in keeping with the no frills nature of the tool, but compared to the XM-18, for example, it's a little boring. While the 551 doesn't weigh as much as several other heavy duty knives, it's weight to size ratio makes it seem bigger than it is in the pocket.

  • On day one: I cut a tomato. It was no surprise that although the 551 is very sharp, it isn't the ultimate slicer. I found that it's not much good at cucumbers, either. I carried the knife on a two mile walk in linen shorts and it felt like the weight of the knife was going to "pants" me. I put it in my back pocket and found it very uncomfortable to sit on.
  • On day two: I again found the ZT 551 somewhat tedious to carry. It opened a plastic bag easily and scored some hot dogs on the grill. I did some yard work and used the knife to chop off a palm frond. Although I would have liked a little more blade length, the ZT really shined. The heft of the knife, along with the keen edge and blade shape chopped out "V" cuts easily. It functioned the same on some 1/2 " to 1" elm branches I tried and felt really good when I shaved some fuzz sticks. The knife felt like an extension of my hand.
  • On day three: We took out the Waverunners and the ZT 551 stayed at home in favor of a Spyderco Atlantic Salt. (Any H1 blades coming from Kershaw/ZT, Thomas?)
  • On day four: The 551 chopped some onion and green peppers. Again, showed its sharp edge, but not the optimal tool.
  • On day five: I packed it up for the next pass around participant.

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Who is this knife for? If you want a Strider SNG but don't want to pay $400-$500, the Zero Tolerance 551 might be for you. It is probably just as heavy duty, comes with better customer service, but has less character. If you like Zero Tolerance knives, but want one without the traditional black blade and recurve, the ZT 551 might be for you. Finally, if you want an XM-18 for $250, you might want to wait for the upcoming ZT 561. Any Zero Tolerance knife, however, will likely last you a lifetime. I've turned to Kershaw customer service a few times and they are the best in the business.

Thanks again to Kershaw and J. Morrow for putting the pass-around together and for www.BladeForums.com for giving us a place to make it happen.

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Great review thus far !

There are times I really want one of these and then the little voice tells me to wait for the flipper coming out since it's more to my style.

At any rate , it is a good lookin' knife.

Tostig
 
Hey, very nice review. I need to check out some of your others. Nice knife.
 
Great Job!

Has anyone spoken up to say what type of material may have caused the tiny nicks in the blade? I know that you stated that you didn't know but wondered if anyone contacted you since the review. Great write up, pictures and review.
Thank you.
 
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Any lock stickiness? I keep having to pry mine loose with a quarter for a few months now. A bit of a pain during daily use if I don't happen to have a quarter on me.
 
Any lock stickiness?

Yes, the lock is sticky and generally hard to disengage, but I haven't needed to use a quarter yet.

Edit: I just read through the pass around thread and one of our members adjusted the lock bar. He said it was at 20% and he bent it about a millimeter to achiieve 50% lock up.
 
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Any lock stickiness? I keep having to pry mine loose with a quarter for a few months now. A bit of a pain during daily use if I don't happen to have a quarter on me.

Noctis, unless you are planning to carry a quarter with you every time you use your 551, you might want to send it to Kershaw for service.
 
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Nice review. One correction though, the "stop pin" is actually the blade stop when the knife is closed. It does not touch the blade when open.

Last weekends I went camping in northern MI, being the 0551 was designed after Ricks camp knife I wanted to see how it performed. I carved a spoon, cut line and worms for fishing, made feather sticks to get the fires going, and many other random cutting tasks. Besides its surprising ability to carve wood it was extremely comfortable in extended use or when gripped hard. At the end of 3 day of fun it was still sharp enough to shave and the edge had only minor burring and two small nicks. It did its job as designed, did it well, and came out smelling like roses.... (Worms) :)
 
Notcis, unless you are planning to carry a quarter with you every time you use your 551, you might want to send it to Kershaw for service.
I'd rather not, as I often find a large chunk missing out of my blade after they straighten out my convex ground edges with a factory grind, as well as shipping complications(I can't use UPS or FedEx). I figure I could fix it with a quick rub against the tang with fine grit sandpaper. As it stands, I don't even carry the knife anymore though.
 
I'd rather not, as I often find a large chunk missing out of my blade after they straighten out my convex ground edges with a factory grind, as well as shipping complications(I can't use UPS or FedEx). I figure I could fix it with a quick rub against the tang with fine grit sandpaper. As it stands, I don't even carry the knife anymore though.

Before you sand down the tang have you tried pencil lead on the tang? It's worked on every Ti framelock I've ever used and it'll let make it smoother until it breaks in.
Best of luck!
 
Before you sand down the tang have you tried pencil lead on the tang? It's worked on every Ti framelock I've ever used and it'll let make it smoother until it breaks in.
Best of luck!
I've tried a sharpie which helped with my R.J. Martin Overkill, but I suspect breaking in a framelock as ridiculously thick as the 0551 would take a while. Spent half an hour flicking the blade open and prying it loose with little improvement thus far.
 
N3880, you could get me your addy, and I could send you a replacement. Just a thought.
 
Loved review! I would like to ask which Kershaw Volt version is that...so I can possible find one;-)
Thanks for your time!
 
After a lot of good use my lock got springy. I have never had this happen with any other framelock but I heard it happens. Some up and down play as well wich isn't uncommon with framelocks.all in all a great knife for the price
 
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