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Kershaw 3870 Amplitude 2.5 Folding Assisted 2.5" Satin Plain Blade, Stainless Steel Handles

Customer Reviews 4.500 Read 10 reviewsWrite a Review
Part Number: KS3870
Manufacturer: Kershaw Knives
Retail Price: $39.99
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KS3870: 3870 Amplitude 2.5
Kershaw Knives

Kershaw and Todd Rexford have teamed up to bring you a smaller pocketknife with plenty of style: the Amplitude 2.5. As you might guess, the Amplitude 2.5 features a 2.5-inch blade. When closed, the knife is a compact 3.5 inches long.

The Amplitude 2.5’s blade is heat treated to Kershaw’s demanding specifications to bring out the very best qualities in the steel. A machine satin finish on the blade and cool, gray titanium carbo-nitride coating on the steel handle give the Amplitude 2.5 a sophisticated look. For easy carry, a left/right reversible pocketclip is included.

This no-nonsense smaller knife offers simple, clean lines, a drop-point blade, and a smooth all-steel handle. So that the Amplitude 2.5 is ready when needed, it can be opened one-handed thanks to SpeedSafe® assisted opening accessed with the handy, built-in flipper.

Easy to carry in pocket, briefcase, or backpack, the Amplitude packs a lot of style into a smaller package.
  • Flipper - May be used on either manual or assisted opening knives. The “flipper” is a protrusion on the back of the blade that the user can pull back on, or flip, in order to move the blade easily out of the handle.
  • SpeedSafe® - Assists you to open any SpeedSafe® knife quickly and easily with a manual push on the thumbstud or pull back on the flipper; built into many Kershaw best sellers.
  • Frame Lock - A portion of the handle (the knife frame) moves behind the blade to lock it into position during use. This is a safety feature of the knife.
  • Reversible - Pre-drilled holes in the handle enable the user to change either the tip position or the side on which the knife carries.
  • Flipper
  • SpeedSafe® assisted opening
  • Frame lock
  • Reversible pocketclip (left/right hand carry)
  • Designed by Todd Rexford
  • Blade Steel: 8Cr13MoV Stainless steel blade, satin finish
  • Handle Material: 410 Stainless Steel, titanium carbo-nitride coating
  • Blade length: 2.5" (6.4 cm)
  • Closed length: 3.5" (8.9 cm)
  • Weight: 2.6 oz. (73.7 g)
  • Made in China
Frame Lock
Frame Lock
Developed by Chris Reeve, it functions like a liner lock but the lock is comprised of one of the handle scales. It's an extremely strong and easy to manipulate lock.
Pocket Clip
Pocket Clip
Includes a pocket clip for easy accessibility and a more secure carry.
Steel Handles
Steel Handles
Stainless Steel knife handles provide strength and durability and look and feel great.
8CR13 Stainless Steel
8CR13 Stainless Steel
Considered a value steel, 8Cr13 steel provides adequate corrosion resistance but with slightly more carbon than AUS-8, it will sharpen up and hold an edge better.
4.500 (10 reviews)
4.5 out of 5 stars
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5 out of 5
Karl S
Hanna City, Il
Jan 28, 2016
Pros: Lock Type, Blade Material, Handle Feel, Ease of Opening, Overall Quality, Weight, Lock Ease of Use, Blade Sharpness
Cons: None
A really great knife for the money
I've had my Kershaw 3870 for a month, and it has become my everyday carry knife. It's short enough, thin enough, and light enough for comfortable pocket carry. I'm not a clip carry fan, so I removed the pocket clip from my knife to make it more comfortable in my hand. The knife requires just a bit of effort to open, enough to make it safe but not enough to be objectionable. The blade locks securely when it's opens, and it is very stable in the frame. The locking tab also requires just a bit of effort to disengage, but this also adds to the knife's safety, The knife easily takes a very sharp edge, and it holds the edge quite well. Based on my experience during the first month with this knife, I am confident and comfortable recommending it to others.
4 out of 5
Jan 01, 2016
Pros: Lock Type, Lock Ease of Use, Weight, Overall Quality
Cons: Pocket Clip, None
Great little knife
If you are looking for a small, unobtrusive folder for opening mail, opening boxes, cutting string, or peeling an apple or pear, this is worth looking into. Opening was a little stiff at first, but it smoothed out. It was reasonably sharp from the box, but it quickly took a shaving edge. It is pointy, the blade tip is like a needle. It's stout, built well, and is a little heavier than you would think. It feels solid without feeling bulky. Plus, it looks nice, very sleek, decidedly non-tactical. The only thing that I can say against it is that the pocket clip is very stiff and it was hard to clip it to my pocket. Not a big deal and can be fixed with a little judicious bending.
5 out of 5
Steven K
Diamondhead, MS
Nov 06, 2015
Pros: None
Cons: None
A Great Little EDC
I recently decided to downsize my EDC from the Spyderco Tenacious to the Kershaw Amplitude 2.5. I found the Tenacious a tad too big for the small tasks I encounter in my office workplace. The Amplitude has exceeded expectations thus far. I've heard other reviews mention blade play, but mine has none whatsoever. It fits my hand very well--my hands are on the small side, though. Most folks won't have room for their pinky finger. Deploying the blade takes far more pressure than I expected--it takes some time getting used to, but I like that I don't have to worry about it deploying in my pocket. The weight feels hefty in hand (probably because of it's size), but I don't notice the weight when it's clipped to my pocket. Speaking of which, the clip is very strong, so I typically hold my pocket lining taut with my other hand when I clip it on. That could be annoying to some people, but I like knowing it's not going anywhere I don't want it to. It came decently sharp and has kept its edge in the light tasks I use it for. Finally, I absolutely love the sleek and modern design.
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