Knife Review: Extrema Ratio T4000 C


Flashlight Enthusiast
May 5, 2010
Hove, UK
Included in this review of the Extrema Ratio T4000 C, a compact classic Tanto with Extrema Ratio's tactical sheath and handle, are a video with an overview and detailed measurements, galleries of the packaging, sheath, and knife, plus insights into how it is to use.

Let's take a closer look.

(This thread is a new approach for me regarding sharing my reviews. Forums are where I came from, and the discussion on forums is something I hope to be involved in and inspire. It has become too much work to convert the reviews published on my website into forum versions, so I need to try something else to stay in touch with the forums.

To the Moderators, there is a reciprocal link at the end of every review on Tactical Reviews. If you have any concerns over this approach please let me know.)

Click on the photo below to go to the full review, but please come back here to discuss.


The video tour of the T4000 C:
In case you haven't seen this video overview and vital statistics of the T4000 C, here it is. This video covers a quick tour of the knife and sheath and a detailed technical measurements section.

A good look round the T4000 C's Sheath - Things to look out for here are:
Even though 'Compact' the sheath manages to fit in a lot of features and details. Solidly constructed and made to fit the compact knife perfectly. On the back is a set of PALS/MOLLE webbing and strap, with the front also having webbing for mounting a small pouch or other item. A gap in the welt at the base of the sheath allows for free flowing drainage. To comfortably accommodate the thick blade stock the welt is similarly sized.
A strong double press-stud retaining strap wraps the handle and keeps the knife securely in place. you can adjust the position of the retaining strap as it is held in place with a Velcro adjusting system. There is an anti-catch smooth plastic insert backing the sheath to prevent wear and damage to the back of the sheath when sheathing the knife.
With there not being a specific belt loop, using the MOLLE strap, you can make your own belt loop to fit the size of the belt.


What is it like to use?

It's a tanto - nice - I always like a tanto. There is a practicality of having an almost chisel-like tip and what I refer to as the secondary point (where the tip and main edge meet) for various cuts instead of using the actual tip of the knife.
The elegant lines are simply a pleasure to look at as well as to use, and being the compact knife class from Extrema Ratio this is a really useful day to day blade. Something you are more likely to pick up and use, as it is very practical.

I knew after measuring the factor edge I would want to re-profile the edge bevel, 25DPS is too wide/heavy for a small knife, even 20DPS would be more than I want. But before doing this, with the sharpness measuring a respectable 281 BESS average I wanted to see how it fared. It would not shave arm hair with this edge, however...

Factory edge put to some minor fire prep tasks. The wood here is fully seasoned so much harder than any green wood. Kindling and feather sticks, perfectly good with these little pieces of wood, using the edge out of the box.

Once you have checked out the full review, please come back here to discuss.