Reviews and Ratings for SOG Pentagon AUTO OTF Knife 3.79" S35VN Black Double Edge Dagger Blade, Black Aluminum Handles - 15-61-01-57

SOG Pentagon AUTO OTF Knife 3.79" S35VN Black Double Edge Dagger Blade, Black Aluminum Handlesrated 3.2 stars out of 5 (5 reviews)
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SOG Pentagon AUTO OTF Knife 3.79 inch S35VN Black Double Edge Dagger Blade, Black Aluminum Handles

 

Price: $349.95

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SOG Pentagon AUTO OTF Knife 3.79" S35VN Black Double Edge Dagger Blade, Black Aluminum Handles
rated 5 stars out of 5
Brent
Lahaina
May 21, 2026
Pros: Blade Material, Blade Sharpness, Ease of Opening, Handle Feel, Handle Material, Lock Ease of Use, Lock Type, Overall Quality, Pocket Clip, Sheath, Weight
Cons: None

Sog off

Knife is first class.!. I saw reviews the knife deployed frequently deployed manipulatively interferes with the integrity of the blade not true. I saw reviews the belt clip is not satisfactory not true. Belt clip is fine knife blade not compromised during deployment. This Knife is an excellent product wish you folks at some time made a longer blade length not sure of the laws here in Hawaii. Thank you guys.
SOG Pentagon AUTO OTF Knife 3.79" S35VN Black Double Edge Dagger Blade, Black Aluminum Handles
rated 5 stars out of 5
Doug
Colorado
Aug 07, 2021
Pros: Weight, Ease of Opening, Handle Material, Blade Material, Overall Quality, Blade Sharpness
Cons: Pocket Clip

Great Knife

I love this knife, so much fun. The button is over sized and easy to use either way from multiple angles. I also like you cannot see the track for it. There is very very little movement in the blade. It wiggles just a little, but no movement edge side. The action it really smooth an feels very natural in the hand. There's a nice spot for the thumb when the knife is engaged. I do wish it came with a glass breaker, deep carry pocket clip and a tonto blade. I was nervous spending so much on this knife, but I love this knife.
SOG Pentagon AUTO OTF Knife 3.79" S35VN Black Double Edge Dagger Blade, Black Aluminum Handles
rated 3 stars out of 5
Td
Minnesota
Aug 13, 2023
Pros: Blade Material, Blade Sharpness, Ease of Opening, Handle Feel, Handle Material, Lock Ease of Use, Lock Type, Weight
Cons: Overall Quality, Pocket Clip

Not for the beginner.

First: I do like this knife. But as other reviewers have noted, it has some issues. Mine is good right now (I mean really good) but then, I'm a tinkerer, I happily void warranties, and I've done some stuff to it. And I understand now why custom OTFs get so expensive. As noted by another reviewer, I initially also had the issue with the edge getting nicked just by deploying the blade, but that's worked itself out over time. So I put that down to a break-in period. Sometimes the action doesn't fully deploy or retract, leaving the blade stuck partway out with no spring tension. Fortunately this is corrected by tapping the butt end on a hard surface with the opening pointed upwards, resetting the action. (Discovered this after a buddy of mine was afraid he'd broken it, after trying it out. He was very relieved.) I use a dry spray lube with PTFE ("Teflon") on mine, which is easy to apply. Let it dry & wipe off the excess, of course, but it doesn't attract grit to gum up the works. This minimizes the deploy/retract failures. The little pocket clip it came with was a no go for me. Too small, too stiff, and the handle texture catches on any fabric, to the point where it wants to rip. I removed the factory clip and replaced it with a longer bent-wire style clip. This required a little careful Dremel work with a micro grinding wheel, and then a bit of 120-grid hand sanding where the clip contacts the handle to smooth the aluminum out, but now it's MUCH more pocket-friendly, while still clipping securely. Biggest problem: the tiny screws do not stay in place. The thumb slider can just come undone after repeated clicks, leaving a screw loose inside, which will foul the action. I was able to disassemble the knife, apply tiny amounts of blue thread-locker to all the screws, and put it back together. This fixed all its problems. Now, the knife's internal mechanism is more like a pocket watch than a dagger, so it's not a simple process. I needed good light, magnification, precise tools, patience, and experience. One more note on this: the three main screws with star-drive ("Torx") heads are very easy to strip out, so be especially careful with those. So: I agree with the reviewer who mentions QC problems on SOG's end. This knife definitely feels like a first effort. Great concept, but the execution needs work. That said, again, I'm very happy with mine... now.
SOG Pentagon AUTO OTF Knife 3.79" S35VN Black Double Edge Dagger Blade, Black Aluminum Handles
rated 2 stars out of 5
Marcin
Hamden, Connecticut
Feb 15, 2022
Pros: Ease of Opening, Handle Material
Cons: None

Major Flaw

At first I was blown away for this knife…as I should be for a $350 knife. As advertised no blade play or atleast none that I could notice. Knife looks great. Awesome design…very stealthy. Absolutely love the look of this thing. But sadly, the above is all the good things I can say. This knife has a major flaw that is absolutely unacceptable for a $359 knife. The mere process of deploying and returning the blade damages the edge. When I received the knife I carefully inspected the edge as I do with all knives I buy…it was flawless out of the box, razor sharp. However, the edge quickly became visibly damaged…even tho I have not used it to cut anything other than paper. I was very confused. I tend to fidget with my knives…so I deployed and returned it a lot when I first got it. It appears that somewhere in the deployment or return or both, the blade comes in contact harshly with some part of the knife. I don’t know where exactly, but just deploying and returning the blade damages the edge a lot. You can clearly see flat areas on the edge. And you can certainly feel it when you run your fingernail across down the edge. I mean that is an unacceptable flaw for such an expensive knife…very disappointing. I will never buy another SOG product again. Shame on them for producing such a flawed product and charging premium price for it…shame SOG, shame:(
SOG Pentagon AUTO OTF Knife 3.79" S35VN Black Double Edge Dagger Blade, Black Aluminum Handles
rated 1 stars out of 5
Edwin
Spring , Tx
Jul 31, 2021
Pros: Handle Material, Pocket Clip
Cons: Weight, Lock Ease of Use

QC issues

Received this on June 5th, so it was one of the first one sent out. Fired well first 5 times, then it would overshoot and a small tab would be visible by the blade and it would rattle. If you pushed the blade back ever so slightly it would lock up. When it did lock up there was absolutely no blade play no rattle, and I thought I had a bargain deadlock. Then the firing became weak and I had to assist the blade every time, then it misfired. SOG reached out to me and offered to replace this, but only if I paid the postage, and their offer did not come until after I had initiated the return process with Blad---. This what I wrote in my return request to Blad---: SOG Knives Pentagon OTF Automatic Dagger Knife Black (3.8" Black) Item defective or doesn't work Misfires rattles in handle, blade deploys then shifts to a set position, next time deploys tightly, then misfires and rattles again. Very inconsistent, extremely hard to reset when it misfires. My Microtechs just need a light blade pull and they’re good to go. Still not sure what specific action resets this. Extremely disappointed. If this is just a QC issue I’d like a replacement As Bla-- chose to refund my money they must have considered it more than QC; however, Bla--- is also refusing to post this exact review because they see all of the problems I have listed as outliers. However there are 4 other reviews with the same complaints including one titled “self destructing knife” if you look on their site. I own 2 Microtech ultratechs, one bounty hunter hellhound, one apocalyptic double edge, and a Guardian Tactical recon 35 (best of the bunch), so I know how a blade is supposed to fire and reset from an OTF. This was a nightmare to reset, and it sounded like the internals were pieces of a jigsaw puzzle in a box being shaken around after that. I could get the knife to fire and sometimes it would set and lock up solidly, and sometimes it would rattle or simply outright fail. I truly believe that SOG has upped their game in the past few years. The Kiku assisted in S35VN is their first real step in that direction, and its got a great blade, but the assist is iffy. The Kiku XR in CTS-XHP cryo is AWESOME, BUT the first one they sent me had QC issues and the XR lock was garbage. The replacement was great and I love it. The SEAL XR is hands down the best hard use knife I have ever owned, and in real world circumstances I will grab it before my Harsey folder, my Hinderer Eklipse, or any of my $250+ ZTs. But this pentagon OTF is garbage. I call it garbage because the QC failure is inexcusable. I have seen reviews about how wonderful this knife is, and I can see that in the first 5 deployments I experienced before the mechanism failed miserably, but c'mon man, SOG should have never let one of these out at LAUNCH that was as crappy as the one I received. It just sucks all the steam out of the launch when people start writing bad reviews. I'm not ordering another one. I'm going to wait a few generations and let them work the bugs out. SOG: do better.