Ontario Mark III Trench Knife, 8155

Ontario Knife - OKC
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(9 reviews)
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Ontario Mark III Trench Knife - Ontario Model Number 8155


Ontario Mark III is made in the USA!

Overall Length 11.7 in (29.7 cm)
Hardness 57-59 HRC
Edge Type Plain
Handle Color Brown
Blade Grind Flat Bevel w/ Swedge
Blade Finish Zinc Phosphate
Blade Color Black
Blade Thickness 0.188 in (0.478 cm)
Blade Material 1095 Carbon Steel
Blade Length 6.8 in (17.3 cm)
Sheath Material Leather
Sheath Color Brown
Sheath Type Belt Loop


  • 5
    Ontario Mark III Trench Knife, 8155

    Posted by Allen Bourgeois on Dec 16th 2022

    OUTSTANDING!!! So well made.

  • 4

    Posted by Darrin Mills on Mar 9th 2022

    Very nice knife. Ordered one from a different supplier and blade was not straight. From the side it bowed down on the long edge. The one I ordered from here was nice and straight and had a good edge. The only downside of it was the leather handle was very dry. Used mink oil to rectify that. I may get another in the future.

  • 4
    Ontario Mark III

    Posted by Tristian on Feb 22nd 2022

    The knife is well built, but as in the original, the trench Knife is not really sharpened. For any sort of non-trench work you'll have to reprofile the blade with a rough stone and then work it down to a finer edge. However, that is how the original was distributed, and Ontario knives maintains the same specifiction. I'd only say that standards have changed in this manner, and I'm pulling only one star because you really need to have knife gear (sharpeners, etc) to reprofile the blade.

  • 4
    M3 Trench Knife

    Posted by ct palmer on Feb 21st 2022

    Really it would be 4.5 stars for this item. A well made and faithful replica of the issue combat knife of WWII. I am not down to the level of whether the color of the leather handle is exact but in design and materials it looks like the genuine article. It would be 5 stars if it came out of the box shaving sharp. I corrected that deficiency easily with a little quality time with good water stones. Would recommend if you are going past the line of contact tonight on a raid to try and capture a prisoner. Perfect for that quiet sentry dispatch once you drop down in the trenches too grab you an enemy grenadier to take back home with you. RLTW!

  • 5
    M3 knife

    Posted by Jack on Feb 10th 2022

    Excellent made knife. Exact copy of the original made in 1942-3. Better then all modern made fighting knives at better then 1/2 the price.

  • 3
    M3 Fighting Knive

    Posted by James Lawrie on Feb 2nd 2022

    Excellent made blade and handle, but…. It comes with a good leather sheath similar to original, but it doesn’t have steel reinforcement or belt hanger that the original M3s came with. The knive is a 5 but sheath is a 3. I believe the originals had a M4 sheath. I have a cheap “MIL-spec” clone that does have correct sheath. I will likely buy a couple more since I like them better than the Air Force survival knife and KBAR, but need to source original type sheaths for them. If I could attack pics you would see what I’m talking about. Also the M3 Blade is just long enough not to fit genuine M1 Carbine or M16 Bayonet sheaths.

  • 5

    Posted by Kristian Michael Montgomery on Jan 11th 2022

    Outstanding item.. AIRBORNE! All the WAY!

  • 4

    Posted by William S Murray on Oct 12th 2021

    Bought this knife to add to my world war II collection, seems to be a good blade so far. The stacked leather definitely needed some neatsfoot oil on it and needed a little touch up on the edge geometry

  • 5

    Posted by John Chlarson on Oct 12th 2021

    Very pleased. Keen edge. Nice phosphate coating on blade. Funky gummy coating on pommel that I sanded off and then applied Brownell Phospho Blue to match blade. Leather washered handle fits my hand great and provides a sure grip. I may like this better than my Gerber Mark II.