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SP193TIP: C193TIP Squarehead
Darriel Caston is an electrical and electronic engineer by trade who has been designing and making custom knives part-time since 1992. His fascination with small folding knives and mechanical gadgets is clearly reflected in his first Spyderco collaboration: the Squarehead. A compact, elegantly simple pocketknife with a shape that inspired its name, the Squarehead offers cutting performance far beyond its diminutive size and does it with a high-precision, high-tech flair.

The heart of the Squarehead is its uniquely square-shaped sheepfoot blade machined from CPM S30V powder metallurgy stainless steel. Its single-sided, flat chisel grind provides excellent edge geometry and strength and allows the cutting edge to lie safely against the handle scale. A trademark Round Hole in the blade proudly identifies the Squarehead as a Spyderco product and allows easy one or two-handed opening.

The Squarehead's unique single-sided handle is machined from a solid piece of titanium. Its one-piece construction includes an integral back strap that also serves as a blade stop and a guard for the edge when the blade is closed. It also houses an integral frame lock mechanism that locks the blade securely in the open position. Amazingly small and lightweight, the Squarehead does not include a pocket clip, but features a wide slot in the handle for easy attachment of a chain, fob or lanyard. Assembled with screw-together construction to ensure the precise alignment of all parts, the blade, handle and other key components of the Squarehead feature an attractive matte stonewash finish.
  • Blade Length: 1.3"
  • Cutting Edge: 1.25"
  • Closed Length: 2"
  • Overall Length: 3.3
  • Blade Thickness: 0.118"
  • Blade Material: CPM S30V Stainless Steel
  • Blade Style: Sheepsfoot
  • Blade Grind: Chisel
  • Blade Finish: Stonewash
  • Handle Thickness: 0.19"
  • Handle Material: Titanium
  • Locking Mechanism: Frame Lock
  • Weight: 1 oz.
  • Made in Taiwan
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.
S30V Stainless Steel
S30V Stainless Steel
A hardened wear and corrosion resistant stainless steel developed in collaboration with Chris Reeve. It is known for its improved sharpness and toughness. This is a premium grade steel only used in high end knives. Composition: Carbon 1.45%, Chromium 14.00%, Vanadium 4.00%, Molybdenum 2.00%
Titanium Handles
Titanium Handles
A nonferrous metal, it's prized for its high strength to weight ratio and is often used on higher end knives.
5.000 (5 reviews)
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5 out of 5
Julien M
South france
Oct 28, 2015
Pros: Blade Material, Lock Type, Overall Quality, Handle Material, Lock Ease of Use, Weight, Ease of Opening, Blade Sharpness
Cons: Sheath, Pocket Clip, Handle Feel, None
Cool folder
I use it everyday , it's really cool and usefull mini knive , great material and finition , cut like a razor straight out the box . Love the Darriel Caston design a lot .
5 out of 5
Sergiy M
Madrid, Spain
Sep 10, 2015
Pros: Blade Material, Overall Quality, Lock Ease of Use, Weight, Blade Sharpness, Ease of Opening, Lock Type
Cons: None
Im a fan of small pocket folders. This small knife is very well made. In my opinion this knife is much better than Spyderco dog tag. In dog tag there is a bar screwed to the handle by 2 screws. Square head has only two parts: blade and handle that is much more solid made. The blade is very sharp from the box. It has sharpening angle of 30 degrees. I use it every day and I don't feel it in my pocket.
5 out of 5
Jul 20, 2015
Pros: Blade Material, Overall Quality, Lock Ease of Use, Weight, Blade Sharpness, Handle Material, Lock Type
Cons: None
use it for light edc and it works flawlessly
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