Benchmade 51BK Balisong Butterfly Knife G-10 Handle (4.25" Black)

MSRP: $340.00
Our Price: $289.00
In Stock!
Add to Wishlist
Item #BHQ-9249


  • Overall Length:9.25"
  • Blade Length:4.25"
  • Cutting Edge:3.75"
  • Blade Thickness:0.10"
  • Blade Material:D2
  • Hardness:60-62 RC
  • Blade Style:Spear Point
  • Blade Grind:Flat
  • Finish:Black
  • Edge Type:Plain
  • Handle Length:5.00"
  • Handle Thickness:0.48"
  • Handle Material:G-10
  • Color:Black
  • Frame/Liner:Titanium
  • Weight:3.30 oz.
  • User:Right Hand, Left Hand
  • Pocket Clip:Tip-Up
  • Knife Type:Butterfly
  • Lock Type:Spring Latch
  • Brand:Benchmade
  • Model:51
  • Model Number:51BK
  • Country of Origin:USA
  • Best Use:Recreation
  • Product Type:Knife


Be sure to view our other Benchmade Balisong Butterfly Knives in stock!

The Benchmade Morpho Balisong 51BK Knife is a larger version of the Benchmade Balisong 32. The 51BK Morpho Balisong Butterfly features a black finished premium D2 steel blade with black G10 handles. The hand polished hardware, jeweled blue titanium liners and Ti carry-clip provide the perfect accent to this great Butterfly Knife. BM51BK

Get a Kydex sheath for the Benchmade 51, click HERE!

Need a Benchmade Balisong Sheath to fit the 51? Pick one up HERE!


Customer Reviews

Write a review for this item
Beautiful flipper
Nick V.
Ive had this knife for almost a week it was a birthday present the blade doesn't come razor sharp but you can still sharpen and it isn't that light i mean I heard that it was too light but it came heavier than I thought it would be and it just flips beautifully it is better than my CCCS
Great EDC
Quint M.
I love this knife so far! I'm an intermediate flipper, it is really light so doesn't carry momentum when doing rollovers as well as other heavier balisongs. I am getting a bit of blade rub which is wearing off a bit of the black finish no matter how tight the pivots get while still keeping free movement of the handles (-1 star). It is pricey as hell but feel it's a good quality knife. I recommend this for a beginner and EDC knife but if you are a flipper already you might be a bit disappointed at the performance due to how light it is. Hope this review helps someone.
Everyone Gets a 51
Brett K.
It's the honest truth, a good knife from a good company. It will get you started flipping, and will cut FOREVER. you can beat on this thing forever, you can use it, forever.

While this has never been my edc, or my go to flipper, it will always have its place. If you are a beginner I would definitely point you to the second hand market of reddit, on r/balisong, on instagram under #balisongsale, and even the facebook group. You will find a good deal on a used 51.

But there really is nothing like a brand new knife to catch your eye and make you drool. buy it today! Its worth it!
Great for begginers
Julio P.
This knife is a perfect starter knife, itís very light weight which makes the cuts with learning not punishing. Itís a must own
Try It Atleast Once!
Connor J.
I got my hands on the limited run of blue G10 variants of this knife, still with the DLC blade, and I have to say it was a beauty! To start, the D2 steel is the best I've ever used. It comes razor sharp and I've never needed to sharpen it since besides a strop or two. In terms of flipping, the knife is on the lighter side but is still very good! You can do basically anything with it, and the crowned spine is very comfortable for chaplins/rollovers. I only have two complaints: 1.) The handles and blade do rub and after it a bit it does wear on the edges of the DLC 2.) The screws are a nightmare to take out sometimes and I ended up stripping one of the smaller ones while replacing the pocket clip. Highly recommend the buy if they go back on sale.
Jason Y.
Flips great, super high quality, smooth action, comes EXTREMELY sharp, and the coating is flawless.
Beautiful beast
Paul z.
I'm not going to go off on the specs and the pro's and cons. This beauty is light as has been stated in the previous reviews. I had been looking at getting one of these for awhile. It was hard to choose between this and the Bladehq green. This was cheaper with the black blade so I went with this. It is a very beautiful knife. Comes sharp as all hell, forgot to latch it and reached in my pocket, Just little pressure and my finger is gashed up good. When I was looking for my first quality Bali this was In The top three and it definitely is worth the money. My other Bali is a tachyon 3. If your between the two then here is my two cents. If you want to learn to flip get the tachyon, if you want a great EDC that still flips we'll go with this. I prefer the weight and length of the tachyon but this knife has a certain simplicity to it's construction that makes it much better for EDC and actual knife applications.
Better than I expected
Cole T.
This is my first high quality balisong, and I am blown away. The fit and finish is phenomenal. I had very high hopes and expectations of this knife, which usually sets me up for disappointment, but this knife delivered. In fact, it's even better than I expected. What a work of art. Benchmade just got a new fan.

EDIT: Thanks to BladeHQ as well! Shipped very fast and they responded to my shipping inquiry within a day. BladeHQ just got a new fan as well.
Pretty Good
Scott D.
Bought this instead of a trainer, cut my hand 14 times in the first day and a half of having it... Pretty good

Kidding aside, the 51 is a beautiful knife aesthetically and functionally, with no blade play when it isn't wanted, excellent blade coating, and an incredibly sharp D2 blade.
Austin O.
This is by far the best flipper on the market right now! If you've got the money then you should turn all other flippers down and get this one! I can certainly say this is my fav flipper
Great knife
dawson r.
Run to it if you got the cash.
Dawson b.
This is an excellent butterfly is very fluent and smooth, as well as light. Two thumbs up.
Victor B.
This is my first butterfly knife with g-10 scales and I have to admit I'm very surprised about how great it feels in my hand. I'm having a great time flipping and I love it so much I'm getting one for my brother.
10/10 AM buying it again!
Zack D.
I own a kimura 7, a Benchmade 67, and now this beautiful black beast. This is my favorite of the 3. It flips on autopilot for me, honestly. I'm working on buying a second one for safe keeping, just because its so beautiful and amazing. The g10 is amazing, and the look of the whole knife is godly. And the way it feels in your hand..... OH YES!
I love this knife
Vincent D.
I like this knife better than my 67. It's lightweight, smooth, and is very sharp. When you flip it you can feel the difference between quality and crap and its high quality this knife. Unfortunately this knife dosent come with factory loctite so u have to do it yourself. Don't put too much bc it will get in washers little is more. .

And do blade hq they let me exchange mine bc the loctite got into washers and my spring latch broke. They were nice enough to replace it for me with no problems even though it was my fault. They don't get A+++ they get E+++++ for excellence. They even send you knife packaged well and cleaned. Thanks BLADE HQ AND BLADEPLAY
shane b.
I love it. It's not the best flipper due to its light wieght but don't let that stop you from buying one, it's still very good, and it looks great with the black blade.
Light and Stylish
Mary A.
I got this knife for myself as an early Christmas gift. It's wonderful! All my friends love playing with it. It is lightning fast. Comes sharp out of the box, with a little carry pouch.

However, I do have this issue where if I'm flipping it for about 30 minutes, the screws begin to loosen up. Some loctite blue will fix this issue easily. :)

10/10 would recommend to a friend.
Light, well made and classy
Tucker G.
I received this beautiful knife as a birthday present from my girlfriend, and I have to say that I'm in love with it. To start, the knife itself comes packed and shipped nicely, in the typical blue Benchmade box, with a nice draw string bag inside to house the knife itself. My first impressions (after flipping a kimura for a few weeks!) was how damn light this thing is! Doing rollovers is lightning fast, the thing feels like a feather! Now, if you dislike light knives, or if you have been flipping a heavy bali for awhile, I would definitely be wary if you plan on getting this beauty, as it clocks in at around 3.3 oz, and this can't definitely take some getting used to (I cut myself 3 times the first night getting used to it xD).

Moving forward, the "spring latch" is a cool feature as well - while it isn't the traditional spring latch we saw on the 42, it is still superior to the basic t-latch you see nowadays - as it keeps the latch away from the blade nicely as well as having the satisfying spring when you unlock the bali. Also, the blade itself is made out of the usual d2 steel, which feels nice and well made - no complaints here. Screws all seem to be holding up too. To sum it up, this knife is nice if you enjoy lighter balis, or if you are looking for something different - similar to what I was hoping for. However, if you have been flipping kimuras forever, this will definitely take some getting used to. I definitely plan on eventually getting Ti handles for this (probably from flytanium when he releases the v4s), as personally I prefer a bit of a heftier feel to my balis. All in all, you can't go wrong with Benchmade, and they definitely delivered with this well made and classy looking bali. 5/5 would recommend.
Pretty D NICE
Kevin B.
In the past I had an original balisong from the 80's. If you find one let me know, I will grab it! This knife is very nice. Balance is quite good. You will get an awesome knife for a great price! One honest suggestion, put Scotch tape on the blade, that way you will not slash up your fingers. The blade is very fine which I greatly appreciate. Awesome knife! You will not be disappointed!
Light, Nimble, and Stylish
Greg E.
The best way to describe this knife is that it just makes the tricks easier. It feels very tightly under your control. It's extremely light, about half the weight of a 62, and almost flips like it doesn't even have mass. The design is incredibly cool and the latch is a good compromise between spring and free swinging. Probably the best flipper on the market for the price if you can afford it.
Benchmade 51
chris j.
Just received it and it I'm happy as can be with it.Another Gem BladeHQ. Thanks again boys
Alan M.
Nice flipper. Came literally razor sharp for me. It is also very light compared to most balisongs