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Ontario 6141 MK 3 Navy Knife (Black), stainless steel

$117.99 with 15 percent savings
List Price: $138.95

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Purchase options and add-ons

Recommended Uses For Product Camping
Brand Ontario Knife Company
Model Name 1061410
Special Feature Water-Resistant
Age Range (Description) 18+ yrs
Included Components Sheath
Handle Material Black High-impact Plastic
Color Black
Blade Material Stainless Steel
Style Fixed Blade

About this item

  • Made of 440A Stainless Steel
  • 6 inch plain edge blade
  • Knife Open Length: 10.75-Inch
  • Weighs 10 ounces
  • 6 inch plain edge blade
  • Knife Closed Length: 3.3-Inch
  • Knife Open Length: 10.75-Inch
  • Weighs 10 ounces

Additional Details

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From the manufacturer

Ontario Knife Company okc knives

The Origin of Ontario Knife Company

Founded in 1889, the Ontario Knife Company is a knife, cutlery, and tool manufacturer operating out of Upstate New York for over 125 years. OKC produces a wide range of tools, including cutlery and kitchenware, hunting and fishing knives, machetes, survival and rescue equipment, science and medical tools, and tactical knives. OKC has a long tradition of building knives and tools for the U.S. military, producing high-quality equipment that has seen continuous service since WWII. In addition to being a major supplier to the U.S. Armed Forces, OKC leverages a network of distributors, dealers, and major commercial retailers to sell its products nationwide and internationally to over 35 countries.

OKC’s custom manufacturing division Jericho Tool, advances capabilities including a broad-spectrum of injection molding, tool and die, and machining operations to provide white label and OEM manufacturing services for consumer and industrial goods. Collectively OKC’s product lines and manufacturing services reach the housewares, sporting goods, tactical, security, law enforcement & first responders, education, science & medical, and industrial & agricultural industries.

Situated in New York State's scenic Southern Tier, Ontario Knife Company produces one of the most comprehensive, wide-ranging product lines in the cutlery industry today. Ontario has built its reputation on a heritage of uncompromising craftsmanship, quality materials and components, and a steadfast commitment to its workforce. Ontario's products product lines include Sporting/Outdoor Knives, Agilite Kitchen Cutlery, Old Hickory Kitchen Cutlery, Industrial and Agricultural Products, RAT Knives, Ranger Knives, and Sci-Med Scientific Tools and Instruments. In addition, we are also a major supplier of private label blades and knives.

Ontario Knife Company - The Knife You Need When You Need a Knife

ontario knife company fixed blade rat series edc military knives

Fixed-Blade Knives

Built to be versatile and durable, the RAT series features either 1095 carbon steel or 5160 carbon steel, tough micarta handles and MOLLE compatible sheathes. The RAT's make ideal fixed blade "every day carry (EDC)" or for on the worksite, campground or downrange.

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Product Description

The Ontario Knife MK3 Navy knife is the current military issue knife to the U.S. Navy. Situated in New York State's scenic Southern Tier, Ontario Knife Company produces one of the most comprehensive, wide-ranging product lines in the cutlery industry today. While being a worldwide supplier, the Ontario Knife Company is also a major supplier to the U.S. Government and its military. Ontario has built its reputation on a heritage of uncompromising craftsmanship, quality materials and components, and a steadfast commitment to its workforce. Black oxide finished stainless steel blade. Molded high impact black plastic handle. Includes molded plastic sheath. Blade has a hardness of 49-54 HRC. Sheath is equipped with a brass belt hanger and loop.
Note: These knives come with an application of oil to protect the finish of the blade during storage and transport. Once that oil protectant is removed with a cloth, the knife looks good.

Product information

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Ontario 6141 MK 3 Navy Knife (Black), stainless steel

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
275 global ratings

Customers say

Customers like the quality, sharpness, and grip of the knife. They mention that it's well made, has a nice hard plastic scabbard, and is one of the very best knives they've ever been issued. They are also happy with the value. However, some customers dislike scratch resistance. Opinions are mixed on appearance, sheath, and edge.

AI-generated from the text of customer reviews

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SharpnessQualityGripValueSheathAppearanceEdgeScratch resistance
69 customers mention "Sharpness"50 positive19 negative

Customers like the sharpness of the knife. They say it's a great working knife with a very sharp blade. Some customers also mention that the point is super sharp and feels great in their hand. The knife is sturdy and sharpens easily.

"This Mk3 has to be one of the very best knives I have ever been issued and carried while serving in the military...." Read more

"...The sheath is perfectly functional and well made if you don't mind the damage to the blade coating by using it...." Read more

"...it was dull as a butter knife but it sliced right through paper so it is sharp...." Read more

"...General impressions: Very useful utility/general purpose knife. Reasonable price. Definitely not a chopper...." Read more

62 customers mention "Quality"52 positive10 negative

Customers like the quality of the knife. They say it's very well made, the sheath is very solid, and the steel is a very good hardened steel. They also mention that the quality is based on workmanship, design, and materials. Some customers say the knife is one of the finest made knives they have come across.

"...my life, as I believe that the quality of this knife is one of the finest made knives I have come across!" Read more

"Hard core heavy duty blade . When Ontario changed the original design from a weak design tip to this they greatly improved the blade strength...." Read more

"This is a sturdy knife, excellent grip, thick blade. This knife is intended for use in real world, harsh conditions. Glad I bought it." Read more

"...If that doesn't matter, the sheath is very solid. One reviewer says the knife becomes easier to slide in and out of the sheath with repeated use...." Read more

17 customers mention "Grip"17 positive0 negative

Customers are satisfied with the grip of the knife. They mention that it has an excellent grip, a nice feel to it, and is very secure in the hand. The sheath is brilliant and holds the knife perfectly secured.

"This is a sturdy knife, excellent grip, thick blade. This knife is intended for use in real world, harsh conditions. Glad I bought it." Read more

"...The handle is of a hard plastic with a rubbery grip, typical military...." Read more

"...The sheath is protective, but it could be better. It grips the blade well, so losing the knife is not an issue, if you insert the blade fully...." Read more

"...As for the knife, it has a good feel, nice and solid. The knife doesn't come all that sharp, so one really needs to sharpen it further...." Read more

10 customers mention "Value"10 positive0 negative

Customers appreciate the value of the knife. They say it's a great working knife and a very good value.

"...Overall, this is a good knife at a great price." Read more

"...General impressions: Very useful utility/general purpose knife. Reasonable price. Definitely not a chopper...." Read more

"...Value is a function of price and quality. Quality is a function of workmanship, design and materials...." Read more

"Great working knife and a very good value. The out of box sharpness is very very poor, initially it was like a very pointy butter knife...." Read more

13 customers mention "Sheath"8 positive5 negative

Customers have mixed opinions about the sheath of the knife. Some find it great, brilliant, and secure in the hand, while others say it's worthless and damages the blade. Some customers also report missing metal sheathing tabs and spring clips.

"...Knife comes with a standard polymer sheath, it it would've been government issue, and this one was already threaded with a lanyard of boot lace...." Read more

"...Sheath is LESS than useless because it actually damages the blade. Have ordered a Spec.-Ops...." Read more

"...I purchased this one and it's a great knife. The sheath is great as well. Mine arrived as everyone else's, dull...." Read more

"...Knife is great, sheath is okay at best." Read more

12 customers mention "Appearance"8 positive4 negative

Customers are mixed about the appearance of the knife. Some mention that it is pretty, nice, and has no blings or decoration. However, others say that it arrives dull as a hammer and is not the same quality knife as it was a few years ago.

"...It is pretty though. The knife was in one end and the sheath was at the other end...." Read more

"...It is very sturdy and sharpens easily. The drawback is that it arrives somewhat dull...." Read more

"...As for the knife, it has a good feel, nice and solid. The knife doesn't come all that sharp, so one really needs to sharpen it further...." Read more

"That's the real deal! A straight forward knife, tough MF. No blings or decoration, all black, arrived very sharp...." Read more

8 customers mention "Edge"3 positive5 negative

Customers have mixed opinions about the edge of the knife. Some say that it holds its edge well, while others say that the geometry is terrible and the hand-ground edges are uneven. Some customers also mention that the knife angles are horrible and the knife has an asymmetrical cutting edge.

"...take a beating (despite not having a full tang), but the edge geometry is terrible and the hand-ground edges are uneven on both ends...." Read more

"...I've done some abusive testing and the edge holds good. I cut some thick branches and plastic. Still holds its original edge...." Read more

"...Navy I know these knives, and what do I get, a knife w/ an asymmetrical cutting edge...." Read more

"...time getting a reasonable edge, and it seems to be keeping the edge well. The sheath is a big plus." Read more

8 customers mention "Scratch resistance"0 positive8 negative

Customers are dissatisfied with the scratch resistance of the knife. They mention that the sheath scratches the blade, and some say that it wears off the finish.

"...Sheath is LESS than useless because it actually damages the blade. Have ordered a Spec.-Ops...." Read more

"...So, if it wears off the blade's finish, so what? I'm going to be wearing even more off just by using it... and I WILL use it...." Read more

"...When removing it from the Sheath it scratches the knife even when oiled.The Sheath dulls the knife each time you put it in...." Read more

"...knife, Excellent steel, comes with a good scabbard but it does slightly scratch the blade. Still excellent product." Read more

This is not the Ontario MKIII MODO or Why would a US Navy knife rust in saltwater?
4 out of 5 stars
This is not the Ontario MKIII MODO or Why would a US Navy knife rust in saltwater?
I talked to a former service guy from Ontario after having a problem. The customer support is awesome. They tracked me down and made sure I got my answers. If anyone is curious, the curved blade shape changed in the 80s due to a request from the Navy. Same steel etc, they just wanted the tips to stop breaking. I've had a few over a long period of time, it has always fit a diverse set of needs well.
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Top reviews from the United States

Talo Runningwolf
5.0 out of 5 stars One of the best knives I have ever carried!
Reviewed in the United States on January 2, 2024
Verified Purchase
This Mk3 has to be one of the very best knives I have ever been issued and carried while serving in the military. This knife is a full tang knife which has been tested by torturing, grueling and putting this knife through every imaginable scenario that those in the NSWF community could come up with! Which is why this knife was selected by the NSWF community chose this knife for their combat knife. As a River Rat, I had the upmost pleasure serving with the best of the best of the Navy's finest. And as a member of the River Rats, I had been issued one of these knives as well. I can say that I would trust this knife with my life, as I believe that the quality of this knife is one of the finest made knives I have come across!
6 people found this helpful
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Frank B. Moore
5.0 out of 5 stars Great utility / fighter
Reviewed in the United States on March 21, 2024
Verified Purchase
Hard core heavy duty blade . When Ontario changed the original design from a weak design tip to this they greatly improved the blade strength. Would highly recommend. Spring retention was a bit tight , but you’ll never lose this blade from the sheath .
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Lee Trafford
4.0 out of 5 stars Great Knife - Useless Sheath
Reviewed in the United States on February 4, 2024
Verified Purchase
The knife is a USN knife which was issued to SEAL team members. Excellent all purpose knife designed for use in the water so resists rusting and corrosion. It is one of the best military knives ever issued, and many former vets can tell you how well it performed under adverse conditions. Compared to the Ontario Air Force Survival SP-2 knife, however, the MK 3 is a half inch longer but far less meaty in the blade and thus less sturdy, and in comparing the two knives, I prefer the SP-2, without denigrating the MK 3, because I think it is more versatile. BUT my REAL issue is with the sheath sent with this MK 3, and I notice that many other reviewers have also complained. It is EXTREMELY difficult to even put the knife into the sheath; it is that tight. In fact, it is potentially dangerous because the blade might slip in the attempt which could cause injury. AND every time you pull the knife from the sheath, you take the coating off the blade. Not sure what the guys who came up with this plastic sheath were thinking. But your black knife will very soon have a silver blade and a scratched one as well. Sheath is LESS than useless because it actually damages the blade. Have ordered a Spec.-Ops. Brand Combat Master Knife Sheath which some have said will fit this blade well, but that sheath costs 50% of the price of the knife.
One person found this helpful
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James D
5.0 out of 5 stars Solid
Reviewed in the United States on March 23, 2024
Verified Purchase
This is a sturdy knife, excellent grip, thick blade. This knife is intended for use in real world, harsh conditions. Glad I bought it.
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Desertguy
5.0 out of 5 stars A great knife but give some thought before using the sheath
Reviewed in the United States on October 6, 2016
Verified Purchase
This is a terrific knife. Many others have written of the virtues of this knife, so I won't be redundant. I can't believe I hadn't discovered this knife before. It is a nearly perfect military issue in features, form and function. The knife is great, but the sheath has pros and cons. Other reviews have mentioned the matter of the sheath requiring significant effort to insert and withdraw the blade as well as the spring blade retention significantly scraping the coating on the sides of the blade a little more each time the blade goes in and comes out. The retention springs inside the sheath hold the blade very firmly causing scrapes along both flat sides of the blade from about midway down the blade to the tip. I take it the sheath was designed and constructed for very secure retention. If it is desired to keep the blade from having the coating removed along the sides of the blade don't use the sheath that comes with the knife. If that doesn't matter, the sheath is very solid. One reviewer says the knife becomes easier to slide in and out of the sheath with repeated use. The sheath has a one inch wide nylon strap that serves as a belt attachment. There is a wire clip at the top of the strap intended to attach it to a military web belt. Just below the top is the retaining strap with a snap to secure around the knife handle. The strap has a loop so up to a 2 1/2 inch belt may be slid through it. The sheath is perfectly functional and well made if you don't mind the damage to the blade coating by using it.
I like the knife and that's why I give it five stars. The sheath is an accessory, and it's up to the owner to decide whether to use it.

Update: after scraping up half the blade using the factory sheath, I decided not to do that any more. Using a "Scotch Brite" scour pad I rubbed out the scrape marks and made both sides of the blade look the same. It removed very little of the black oxide coating. Now the blade looks almost new. I work with Kydex, so now the knife has a new sheath and a new look.
16 people found this helpful
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B.C. Dunn
5.0 out of 5 stars Don't believe the ney sayers
Reviewed in the United States on January 27, 2020
Verified Purchase
If you are looking for a rugged survival knife or are into collecting military knives add this one to your collection. The knife is not as sharp as it could be out of the box, but, two thoughts here: first, for the price I can sharpen it myself; second, if you can't stone a blade, don't play with them. It is an original copy of the USN Mk 3 Mod 0, same with the sheath. The blade is 6 inches from the hilt to the tip and has a black most likely phosphate finish similar to post ww2 small arms finishes. The handle is of a hard plastic with a rubbery grip, typical military. The sheath with it's retaining clips fits the knife snug and will retain the knife until you are ready to deploy the blade. From visual inspection, I can not say if this is a full tang knife, the pommel is a not magnetic alloy along with the hilt but are both meaty. The blade is attracted to a magnet, but from my experience a lot of stainless is magnetic. Overall, this is a good knife at a great price.
15 people found this helpful
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J. Mc.
5.0 out of 5 stars Buy it while you still can!
Reviewed in the United States on July 28, 2023
Verified Purchase
You better buy this while you still can Ontario knife company has closed and all the workers let go. The Ontario name and remaining stock has been sold to another company their a distributor not a manufacturer. The new company is going to continue some of the offshore produced knives (Rat folders) and looking to keep US production on certain models probably Rat fixed blade etc. My guess is all the military knives and bayonets will be discontinued once the stock is depleted. I got the MK 3 from Amazon today and the quality looks fine it felt like it was dull as a butter knife but it sliced right through paper so it is sharp. The people complaining about the blade coating must not have much experience with this type of treatment lol besides it's made out of S.S.
11 people found this helpful
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Top reviews from other countries

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Hugo
5.0 out of 5 stars Excelente cuchillo
Reviewed in Mexico on August 24, 2023
Verified Purchase
Se nota de excelente calidad, el que vende Amazon es original, en otros sitios son copias chinas de menor calidad.

Tengo 3 años con el y sigue cómo nuevo.
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LeCheffre
5.0 out of 5 stars Quality American Made Product
Reviewed in Canada on January 25, 2023
Verified Purchase
Solid and durable knife. I have heard that some of these knifes have arrived dull, however, the one I was received passed the paper and shaving test out of the box. There were slight imperfections at the edge of handle, something you wouldn't see in a SOG, but nothing major.
3 people found this helpful
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Florian Reischl
3.0 out of 5 stars Mal anders herum
Reviewed in Germany on December 28, 2014
Verified Purchase
Oft liest man ja von guter Ware und schlechten Händlern. Hier ist es mal andersrum.

Zur Ware:
Braucht man wirklich ein MK 3 Navy Knife? Klares Nein! :o)
Unabhängig davon macht mir auch der Stahl der Klinge einen minderwertigen Eindruck. 1/5 Punkte

Zum Händler:
Der Händler bekommt 5/5 Punkte! Von Anfang an super freundlich und zuvor kommend. Beim Import (die Ware kommt aus Amerika) beschloss der Zoll das Paket erst mal zu konfiszieren und Trouble zu machen. Der Händler hat sich um alle Angelegenheiten gekümmert und mich auf Stand gehalten. Nach ein paar Tagen war alles gut, ich hatte keine Scherereien und die Ware kam an. Top Kunden-Service!! Danke noch mal dafür :-)
One person found this helpful
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Don E.
5.0 out of 5 stars Awesome Knife
Reviewed in Canada on November 17, 2022
Verified Purchase
very nice
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Mr. K
4.0 out of 5 stars Rugged and ready for abuse!
Reviewed in Canada on February 16, 2015
Verified Purchase
Well made and much along the same style quality as OKC's bayonets. Comes with a plastic spring loaded hard case type scabbard. These type of scabbards make sense for bayonets. Not sure what the reasoning was for doing the same with a knife of this genre. It feels pretty much like a shorter version of the classic USMC Ka-Bar but with saw teeth. Comes fairly sharpened and the tip is double edged which really does facilitate stabbing and puncturing (as compared to single sided blades when tested on a double walled card board box). OKC military grade knives leave me feeling as though I'm holding a heavy duty garden or shop tool that I bought from the hardware store. Rugged and ready for abuse. The size and handle are practical. As a military collectible it's perfect! Four stars only because customs opened the box and tagged on an additional $27CDN that I had to pay at the post office in order to receive it. Shipping was a bit delayed as a result, but not the vendors fault. Vendor sold and shipped as advertised. Not at all disappointed with the product and service.
3 people found this helpful
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