The F4 Echo is the TEKTO folder made with Zastava: a 3.40-inch titanium-coated S35VN reverse tanto on a flipper, a button lock, and a 6061-T6 aluminum handle with G10 inlays in Serbian red, American walnut or black, at 2.64 ounces. It is the only TEKTO folder in S35VN, which makes it the one for people who want a stainless powder steel in a knife that still sits under $200, and the design details come from Zastava's heritage the same way they do on the A7 Zastava OTF. Here is what it is made of, how it opens and locks, what the reverse tanto is for, where it is legal, and how it sits beside the other folders.
The Short Version
The Echo is the F2 Bravo's size with a better steel, a button lock and a blade shape made for the tip. S35VN holds an edge longer than D2, resists rust without a coating doing the work, and sharpens without a fight. The reverse tanto puts a thick, strong point on a blade that still slices, the button lock holds the blade closed in the pocket as well as open in the hand, and the flipper opens it with one finger. It is light, 2.64 ounces, and it is the folder to pick when edge retention and a strong tip matter more than the lowest price. The folders under $200 page puts it beside the F1 Alpha, F2 Bravo and F3 Charlie.
Made With Zastava
Zastava is the Serbian arms maker whose designs have been in service for more than a century, and the F4 Echo is the second TEKTO knife made with them, after the A7 Zastava automatic. The collaboration shows in the handle: G10 inlays in Serbian red, American walnut or black set into a 6061-T6 aluminum frame, with the look of Zastava's classic designs and the practicality of a laminate that does not absorb water or wear smooth. The Echo is the folder for the Zastava owner who wants a matching knife in the pocket, and for anyone who likes a handle with some color in it.
The Reverse Tanto
A standard tanto carries its edge in two straight lines that meet at a corner, which gives a strong tip and a blade that pierces. A reverse tanto flips that idea: the spine, not the edge, angles down to the point in a straight line, and the edge keeps a continuous belly. The result is a tip that is thick and strong, because the spine stays full almost to the end, on a blade that still slices like a drop point. It is the shape for people who use the point hard, for opening packaging, scoring and piercing jobs that would snap a thin tip, without giving up the everyday cutting. Our tanto guide covers the standard tanto, and the blade shapes guide draws the reverse tanto beside the others.
S35VN
The blade is 3.40 inches of CPM S35VN, hardened to 60 to 62 HRC, under a titanium coating. S35VN is a stainless powder steel, which means its carbides are small and evenly spread, so the edge is consistent and sharpens cleanly. It holds an edge longer than D2, resists rust in a sweaty pocket without relying on the coating, and takes impact better. It is the steel in the A5 Spry, the Spry Mini and the A7 Zastava, and the Echo is the only TEKTO folder that runs it. Our blade steel guide puts S35VN beside D2 and MagnaCut and explains the trade.
The Button Lock and the Flipper
The Echo opens on a flipper, the tab on the spine that the index finger pulls to swing the blade out, and it locks with a button lock, a plunger that drops into the blade when it opens and releases at the press of the button. The button lock does something a liner lock does not: it holds the blade closed as well as open, so the knife stays shut in a pocket without a detent doing the work. Closing is a press of the button and a swing, with the thumb never crossing the blade path. The F3 Charlie uses the same lock, and our folding knife anatomy guide compares it with the liner locks on the F1 Alpha and F2 Bravo.
The Handle
The frame is 6061-T6 aluminum, the alloy in TEKTO's OTF handles, machined, with G10 inlays set into each side. It is 4.35 inches long and 0.5 inches thick, which fills the hand without filling the pocket, and the whole knife weighs 2.64 ounces. The pocket clip is ambidextrous. There is no lanyard hole on the Echo, which keeps the lines clean, and the knife comes with a TEKTO pouch. The blade can be engraved.
What It Is For
Everyday carry for someone who opens a lot of packages and wants the tip to survive it. The office, the commute, the shop, the camp table. The Echo is the folder we would pick for a person who has worn the tip off a thinner knife, or who has let a D2 blade rust and would rather not again. For heavier work and a bigger blade, the F3 Charlie. For the lightest TEKTO folder with the finest finish, the F2 Bravo. For a work knife at the entry price, the F1 Alpha.
Where It Is Legal
The Echo is a manual folder, not an automatic, so it is legal to own in every state and it does not meet the switchblade bans. A few states and cities limit concealed carry by blade length, and at 3.40 inches the Echo sits under most of those lines and over a few of the 3-inch ones. Our 50-state guide has one line per state and a full page for each, and the carry guide covers clip position and the places no knife goes.
Care
S35VN asks for little. Wipe the blade dry after a wet day, oil it before long storage, and put a drop of oil at the pivot every few months. The button lock needs nothing but a blow of air to clear lint. Sharpen on ordinary stones at the 20-degree angle every TEKTO blade leaves with, and diamond stones make quick work of it. Our folding knife maintenance guide and sharpening guide cover the routine, and the limited lifetime warranty covers defects in materials and workmanship.
The Echo Beside the Zastava
The A7 Zastava is the automatic half of the collaboration: a 3.60-inch titanium-coated S35VN OTF in double edge or spear point, with wood inlays in an aluminum handle. The Echo is the manual half, with the same steel and the same heritage in the handle. Together they are the pair for the shelf and the pocket, and where automatics are restricted, the Echo is the one that travels.
The Echo, the Zastava and the Folders Beside Them
The S35VN flipper, its automatic sibling, and the two D2 folders closest to it in size.
People Are Asking
What are the F4 Echo's specifications?
A 3.40-inch titanium-coated CPM S35VN reverse tanto, hardened to 60 to 62 HRC, on a flipper with a button lock, in a 4.35-inch 6061-T6 aluminum handle with G10 inlays in Serbian red, American walnut or black, 7.75 inches open, 2.64 ounces, with an ambidextrous clip and a TEKTO pouch. Made with Zastava.
What is a reverse tanto blade good for?
A strong, thick tip on a blade that still slices. The spine angles down to the point in a straight line while the edge keeps a continuous belly, so the point survives scoring, piercing and hard packaging work that would snap a thinner tip.
Is S35VN better than D2?
For most people, yes. S35VN holds an edge longer, resists rust without relying on a coating, and takes impact better. D2 holds a fine edge and costs less, which is why the other TEKTO folders run it. The F4 Echo is the only TEKTO folder in S35VN.
Is the F4 Echo legal to carry?
It is a manual folder, not an automatic, so it is legal to own in every state. A few states and cities limit concealed carry by blade length, and at 3.40 inches the Echo sits under most of those lines and over a few of the 3-inch ones. Check your state's page in the 50-state guide.
What is the difference between the F4 Echo and the A7 Zastava?
Both are made with Zastava and both run S35VN. The A7 Zastava is a 3.60-inch double-action OTF automatic with wood inlays. The F4 Echo is a manual flipper with a button lock and G10 inlays, which makes it the one that can travel where automatics are restricted.
