Kershaw Amplitude 2.5 Assisted Opening Knife (2.5" Satin) 3870

Item #BHQ-21526
MSRP: $49.95
Our Price: $29.95
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  • Overall Length: 6.00"
  • Blade Length: 2.50"
  • Blade Thickness: 0.09"
  • Blade Material: 8Cr13MoV
  • Blade Style: Drop Point
  • Blade Grind: Hollow
  • Finish: Satin
  • Edge Type: Plain
  • Handle Length: 3.50"
  • Handle Thickness: 0.33"
  • Handle Material: Stainless Steel
  • Color: Gray
  • Weight: 2.45 oz.
  • User: Right Hand, Left Hand
  • Pocket Clip: Tip-Up
  • Knife Type: Spring Assisted
  • Opener: Flipper
  • Lock Type: Frame Lock
  • Brand: Kershaw
  • Model: Amplitude
  • Model Number: 3870
  • Designer: Todd Rexford
  • Country of Origin: China
  • Best Use: Everyday Carry
  • Product Type: Knife

The Kershaw Amplitude 2.5 is a Todd Rexford designed assisted opening knife that is perfect for sleek everyday carry action. The blade is satin finished with a flipper opener. The 410 stainless steel handle is titanium carbo-nitride coated. Reversible left/right hand carry pocket clip.

Customer Reviews

Fantastic Knife
Anthony L. on Mar 5, 2019

This is a great EDC. Affordable, fun, fast deployment. Perfect size. All round great blade.

Great EDC
Anthony L. on Oct 1, 2019

I carried this knife as an EDC for several months and loved it. Small size and snappy action make it a perfect little user.

Great Knife for the price
Michael J. on May 15, 2017

This isn't a para 2 or a zt, but for the price, it's a very nice knife with a great action.

Awesome Little Knife
Daniel B. on Aug 10, 2015

Just got mine today. Beautiful clean lines. Reverses for me,, lefty! It is everything I could ever want in a small knife. You push that flipper and when assist takes over it is smooth with a very decisive lock up. Only one thing I would want more out of that knife. S90V with a boss HT. But then the price would be up there. I would settle for S30V or VG10. Or even the new not to expensive CTS-XHP. (which is, per manufacture, a more stainless D2) and I just heard that some companies are HT'ing to 62 RC. Oh, and a small over travel stop on the frame lock. But let's face it, for a knife under thirty bucks it's all the knife I could ask for. I LOVE IT!! I give it five stars plus a 10/10 I LIKE IT.

Small but great EDC
Alex M. on Jan 23, 2018

Good ergonomics for such a simple and small knife. Simple and great for the price.

First Flipper
Michael J. on Jan 7, 2018

My first flipper. Comparing to another flipper I've bought since (am3). I like this one. Good action, satisfying click when opening, comfortable flipper tab, and nice small slim size. Not the best for heavy use, or even cutting boxes.

Needs improvement
Edward P. on Sep 4, 2015

Perfect size for a pocket knife. I like the modified drop point blade profile. Opens fast and lock up is good with very little side to side movement. I don't care for the spacer between the pocket clip and knife. It loosened after little use and rubbed a little of the finish under the clip. I just took mine off completely. The knife doesn't have a safety but uses a detent pin on the frame lock to help prevent accidental opening of the knife. Consequently, you will need to apply some pressure to the flipper to open the blade. The detent pin also rides on the blade as it opens and closes. This is fine, however the scales should have been designed to hide this detail. Right now with the blade in the open position, you can see an arcing scratch near the base where the pin rides on the blade. Overall the knife is good... could be better.

Made in China
Brian H. on Mar 19, 2015

I like this design and size. There are not enought blades offered under 3 inches. However, I was very disappointed when I realized it was made in China. BladeHQ ad claims USA but it is clearly marked China.

Blade HQ response:
We will look into the origin- we apologize for any mistakes.
Stiff, kind of awkward
Patrick A. on Feb 28, 2022

It's an inexpensive knife, so I'm not expecting a whole lot of refinement and all that, but on the first few dozen openings, the spring wouldn't get it more than halfway open. The pivot screw might just need to be loosened, but the pivot is free-spinning and smooth on the back; I can't get the thing to budge. Unfortunately, the spring that isn't all that evident in getting the thing open makes itself known when you try to close it. The frame lock is pretty heavy, doesn't stick out very far, and has very smooth jimping. The overall impression is of a small, dense little knife where every manipulation seems to take two or three times more effort than it should. It is loosening up a bit with time, though, and gradually deciding it'll open all the way reliably. So the opening is getting better. Update: The knife was breaking in more and feeling pretty good, then the torsion bar snapped. On taking it apart (I did eventually manage to get the pivot unscrewed) I found the plastic washers were also chewed up on the edges, where I think they rub against the torsion bar. I don't think that had anything to do with the torsion bar failure, but likely contributed to the knife being stiff out of the box. I'll see if I can get a replacement torsion bar from Kershaw. I do think the design on this knife is basically good, but the execution is not.

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