SOG Knives Pentagon OTF Automatic Dagger Knife Black (3.8" Black)

Item #BHQ-120699
MSRP: $388.95
Our Price: $349.95
Preorder Down Payment: $5.00
In Stock!
Add to Wishlist

This item qualifies for our layaway program!


  • Overall Length: 9.00"
  • Blade Length: 3.75"
  • Cutting Edge: 3.75"
  • Blade Width: 0.75"
  • Blade Thickness: 0.13"
  • Blade Material: CPM S35VN
  • Blade Style: Dagger
  • Blade Grind: Flat
  • Finish: Black
  • Edge Type: Plain
  • Handle Length: 5.25"
  • Handle Width: 1.25"
  • Handle Thickness: 0.59"
  • Handle Material: Aluminum
  • Color: Black
  • Frame/Liner: Stainless Steel
  • Weight: 6.70 oz.
  • User: Right Hand, Left Hand
  • Pocket Clip: Tip-Down
  • Knife Type: Automatic
  • Opener: Thumb Slide
  • Brand: SOG
  • Model: Pentagon OTF
  • Model Number: 15-61-01-57
  • Country of Origin: USA
  • Best Use: Tactical, Everyday Carry
  • Product Type: Knife

  • CPM-S35VN, double edge, dagger blade with a black finish.
  • Textured, automatic thumb slide opener.
  • Black aluminum jimped handle with black hardware.
  • Tip-down pocket clip.


SOG Knives has created one daring out-the-front knife with this Pentagon OTF. The double edge dagger blade is made out of premium stainless steel. The thumb slide is quick and easy to launch the blade into action for slicing and cutting with no hesitation. The Pentagon OTF has a reliable locking system and solid blade lock-up when it comes to zero blade play, keeping it free of clatter within the handle. Textured jimping along the edges prevent any sliding or loose grip. To top it off, a tip-down pocket clip makes this readily available for your EDC collection.

If you like this automatic action, check out more of the SOG Tactical Automatic knife models and find a new piece for your EDC.

Customers Also Viewed

Customer Reviews

A gamble I am glad I took.
Stephen B. on Jun 8, 2021

It felt like a massive gamble buying this, with no video's of anyone besides the CEO of SOG talking about it. Let me tell you, the hype is all real. I own 10 high end OTF's from Microtech, Benchmade, Brian Tighe, Guardian Tactical, and now this SOG Pentagon. The lockup is 99.99% on this knife! It has not failed to fire or retract yet. Granted it has only been a day so far. I was a little worried that this knife would disappoint me, but the total opposite happened! This is a quality, solid knife! If you are reading this... BUY IT NOW! You will love it. I haven't handled a G&G Hawk Deadlock yet, so that is why I say 99.99% lockup on the SOG! I am amazed that they are bringing a knife this good, at the $350-400 dollar price point. This knife feel's like it should cost 2x the price. Really, it is that good!

Seeing is believing!
Artem G. on Jun 8, 2021

I will probably make a full video review of this knife on YouTube but long story short is that read the other review on this item and it says it all. SOG is really raising the bar for OTF knives with this one: excellent price point, nearly perfect lockup, looks great, feels great in the hand, and really excellent craftsmanship and quality. Just to note which isn’t a con for me but maybe for some it does come in between 7-8 oz’s so a bit heavier than an average OTF but the action is very smooth and addictive and overall a must have for any OTF enthusiast.

My new OTF EDC
Kurt F. on Jun 8, 2021

Waited months for this release. When I saw a chance to have one a couple of months early I didn't hesitate. SOG just raised the bar on OTF in and out snap. The knife is as advertised. No play, no wobble, no shake, rattle, or clatter. I am glad to have one in my collection, all things considered, it is worth it.

Buy it
Israel S. on Jun 10, 2021

I want to do a video review on the knife as words are just words. Let me tell you the lock up is superb it does have the slightest rattle when closed but that’s probably the mechanism. The knife will not move. To address some issues it will fail to fire if not fully pushed up as the mechanics has a piece that looks like a chamber indicator that stabilizes the blade and if not depressed will lock the knife into place. After a quick push up and down the knife will unlock if this happens. I put it next to an infidel and verspa knife and measures so close to length you won’t miss blade. If you’re on the fence on this one do it. Stop thinking just do it. Sog is impeccable with sharpening services and will replace parts or repair for lifetime of ownership. If I had to pick benchmade or SOG this is da way.

Good OTF, maybe not the best for the price.
Tyler H. on Jul 27, 2021

Really good action and solid construction. Little on the heavy side. It would be more competitive at a $300 price, but I don’t regret buying it for $350.

Big flaw resolved
Kaiyler H. on Jul 5, 2021

So when I first bought this knife it had a major issue with dulling as the blade was retracted, SOG has fixed the issue. I sent it in for a third time and a replacement was sent my way. The knife locks up Rock solid and the blade has no dulling when the knife opens or closes on either egde. It is fixed, so if you have one and it has this issue just tell SOG and return the knife, they'll replace it for free and if you're skeptical about buying it I can assure you it's no longer an issue. The only reason I gave it 4 stars was because of the previous issues and the fact it came with a not so great edge.

Raul E. on Jun 14, 2021

I was very excited to get this one because of it’s features. First thing I noticed was it is very heavy. Maybe I got a prototype made of zinc. It is heavier than it looks for sure. Second thing is mine actually rattles closed. I thought that was one of their selling points? No rattling blade in or out. It is ergonomic and looks really cool. The action reminds me of one of those Harkins Tritons. Considering returning since it is a high price point and doesn’t do what they said it does.

Not your typical SOG
JEFF R. on Nov 30, 2021

SOG advertises this knife as a solid lockup and no rattle. That is true. However, I have had three of these knives so far…the first one failed to deploy (or retract) about 1 out of ten times. I called SOG warranty and got a replacement…It was WORSE than the first one. It failed to open the very first time I took it out of the box, then continued to fail nearly half the time. The third knife I received has only failed to deploy a few times, so I decided to just keep it. If you want a cool knife, that sometimes works and sometimes doesn’t…then this is the knife for you. If you want a reliable knife that opens EVERY time you push the button, buy a Microtech, Heretic, Hogue or Boker…

could be better
David T. on Nov 15, 2021

the design itself is great the lock up is better than my infidel but when it is going In and out of the handle it scratches on the sides and cause the blade to become dull. i have had mine for less than a week and i have sharpened it about five times. SOG needs a serious redesign of the internal mechanism

Excellent design, but has some serious issues
Semyon P. on Jul 26, 2021

Hello everyone. I ll try to be short If my job was to stub people with a knife, I would choose this knife. It has excellent ergonomics for combat purpose. The knife jumps from one hand to another a lot of different way to hold it. Disadvantages: - the blade got stuck 3 times in open position!!!! To retract the blade you need to hold and slightly push down the blade without using a button. - blade edge had a serious damage on both sides coming from the box!!!! Overall good knife. I presume it will get better some time in the future when sog will fix all this problems Cheers, Semyon

Blade can only be retracted using 2 hands
Miled J. on Jun 8, 2021

I bought this knife with the expectation I would use it as a frequently carried knife. I liked the idea of no blade wobble when the blade is retracted and no blade play when the blade is extended. It performs pretty much as advertised in those aspects. The blade is not too hard to extend. However when trying to retract the blade a lot of force had to be applied and almost always I had to use both hands as the force I was able to apply with one thumb was not enough. I also noted that when the blade was extended if you pull the blade slightly it appears to lock in place as if it had not completely locked in place. I tried calling SOG got their answering machine and left a message and they never called me back. I also sent a e mail and did not receive a response. Fortunately Blade HQ agreed to take the knife back. I know this may not be a fair comparison, but I have a G&G deadlock and the quality difference are significant. It may not be a fair comparison as the deadlock cost 3 times the amount of money. However the extension and retraction of the deadlock blade is so smooth with springs with similar tension throughout the range. Also the lockup is better with the deadlock. Even though I like the deadlock in my opinion it is too expensive to every day carry. Even with the problem with the knife I am hoping that I just got a knife with springs that were too strong and will consider purchasing another Pentagon OTF in hopes it works better.

Highly Inconsistent Quality Control
James Y. on Jul 20, 2021

So, I have had many issues with this knife. I first noticed that wear marks appeared on both sides of the fuller simply from opening and closing the knife. The lock up was solid and the action was fairly good, not as strong as a microtech but better than an Infidel. However, as I continued to play with the knife the wear marks started to lengthen and completely wear through the blade's coating. Shortly after, the knife completely failed to deploy at all. I do not mean that it would partially deploy and I had to pull the blade to engage the lock (per SOG's instructions). No, the blade did not leave the handle at all. I contacted SOG's warranty department, and got a replacement knife. Unlike the first the new knife does not have the same solid lock up, it has noticeable side to side play and has already started developing wear marks on the blade. I have contacted SOG again to try to resolve this as it is possible that I got unlucky twice. Overall the experience has greatly reduced my confidence in the knife. I will update this review if I actually get a functioning knife at some point.

Not worth the SOG name.
Paul M. on Aug 17, 2021

Note: I have collected knives (including many SOGs) for over 30 years and, know a lot about them! I purchased this knife on the day it became available to the general public. Right out of its package I noticed spots of dullness on portions of the blade. As I operated the action a few times, I observed the dull spots getting larger. While this is normal on Asian built, "self dulling" OTF knock-offs, it is certainly not acceptable on a USA made $350 knife. The lockup WAS tighter than my Microtech, Benchmade and Guardian OTFs, though not tighter than my Deadlock but; the price of that sturdy-ness is a damaged blade edge. Either I got one that slipped past SOG's QC or, the design is flawed; either way- Shame on You SOG! I will say in defense of Blade HQ, they allowed me to return the knife with very little fuss.

Do Not Buy this Knife
Sam S. on Sep 17, 2021

I never write reviews, but this knife's quality can't be ignored. My example: - came loose while retracting 10% of the time - rubbed on the frame creating blade wear - was extremely dull from the factory - didn't have an even grind Buy Microtech, Guardian Tactical, Heretic or Hogue

Lou S. on Jan 27, 2022

I handled this blade and I have never handled an OTF that had so many deployment failures! If you want a solid proven OTF go with Microtech! They make a zero fail OTF, I have 5 different models and all are amazing; I can't even say I ever had a issue of any kind

Blade HQ Copyright © 2022 Blade HQ. All rights reserved