Part #: KS3871BW | Kershaw Knives
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KS3871BW: Amplitude 3.25
Kershaw Knives
The Kershaw Amplitude is bigger than ever. Literally. Kershaw and Todd Rexford teamed up to bring knife users all the style and streamlined looks of the Amplitude 2.5, but in a slightly larger pocketknife.

The Amplitude 3.25 offers a 3.25-inch blade—as you might have already guessed—yet when closed, the knife is still a compact 4.1 inches long. The 8Cr13MoV blade is heat treated to Kershaw’s demanding specifications to bring out the very best qualities in the steel. A Blackwash finish on both blade and handle combines with the simple lines of the Amplitude to give this knife a sophisticated look. Oversized pivot hardware kicks it up a notch in style.

This no-nonsense knife offers simple, clean lines, a drop-point blade, and a smooth all-steel handle that’s contoured to give it the feel of Todd’s custom knives. A sturdy frame lock secures the blade when open. So that the Amplitude 3.25 is ready when needed, it can be opened one-handed thanks to SpeedSafe assisted opening and the handy, built-in flipper.

Kershaw completes the package with a left/right reversible, deep-carry pocketclip. Just loosen the screw, flip the clip around, retighten and you're good to go.
  • 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.
  • Frame Lock - A portion of the handle( the knife frame) moves behind the blade to lock 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.
  • Blade Length: 3.25" (8.3 cm)
  • Handle Length: 4.1" (14.3 cm)
  • Overall Length: 7.25" (18.4 cm)
  • Blade Steel: 8Cr13MoV, Black-Oxide Blackwash Finish
  • Handle Material: 410, Black-Oxide Blackwash Finish
  • Weight: 4.3 oz. (122 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.
8Cr13MoV Steel
8Cr13MoV Steel
An affordable medium carbon stainless steel with a good balance of edge holding and corrosion resistance properties.
4.500 (6 reviews)
4.5 out of 5 stars
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5 out of 5
Cutting Kalis
Sep 17, 2017
Pros: Pocket Clip, Overall Quality, Lock Ease of Use, Handle Feel, Blade Sharpness, Ease of Opening, Lock Type
Cons: None
Perfect fit
This knife is exactly what I expected. It is durable, and sits so low that it is nearly invisible. The clip is nice and sturdy, but still fast and easy to draw. The spring assist was a little weak the first seven or so times I opened it, but after that it has been just as strong as the other Kershaws I have owned. Overall, this is a fantastic folder.
5 out of 5
Jul 10, 2017
Pros: Ease of Opening, Lock Type, Lock Ease of Use, Overall Quality
Cons: None
Great looking knife
I really like the blackwash, looks super. Great blade shape for my uses (slice apples, cut twine, cardboard). The flipping action is easy. Lock is secure.
3 out of 5
Hawthorne, Ca
Dec 01, 2016
Pros: Ease of Opening, Handle Feel, Pocket Clip
Cons: Weight, None
Great handle and hand position, wish it was full flat grind
Perfect deep carry clip - why isn't every other folder made with this clip arrangement? Having no gap/distance between the handle and guard to the start of the cutting edge is a relatively rare feature for a flipper, it's almost like a proper knife. I really dislike folders where the design leaves the hand position some distance from the start of the cutting edge, and where the effective blade length is compromised by a poorly positioned thumb stud. This is a well designed handle that maximises actual cutting edge length, with the flipper acting as a small but handy guard when deployed. I wish they made it with a full flat grind drop point blade, I think that would be a very popular knife (rather than the full face hollow grind spear point). I can feel a workshop project coming on... Pros - handle, clip, full length cutting edge, flipper position and config Cons - it's a bit heavy, the blade has that stupid "tactical" coating, would prefer full flat grind geometry for improved slicing as hollow grind on blades with narrow width are... just stupid.
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