C166 Equilibrium

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The C166 Equilibrium is a small folding knife based on the C141 Balance.

Appearance in catalogs

The C166 Equilibrium appeared in the following catalogs:


Ed Schempp

History, mentionings from the forums etc.

Information from the Spyderco catalog on the web

"The Equilibrium takes the highly refined symmetrical design of the popular Balance folding knife and scales it up to offer a full four-fingered grip. Like the Balance, the Equilibrium was designed by renowned knifemaker Ed Schempp. And, like its inspiration, it packs impressive cutting performance into a remarkably compact package.

The Equilibrium features a satin-finished stainless steel handle that forms the foundation for its Reeve Integral Lock (R.I.L.) mechanism—a robust, reliable lock built into the reverse-side handle scale. A four-position pocket clip allows the knife to be conveniently carried on either side of the body in either the tip-up or tip-down position. Its compact size also makes it a practical and stylish money clip when carried inside the pocket.

The blade of the Equilibrium is precision machined from VG-10 stainless steel. Its perfectly straight cutting edge is supported by full-flat-ground bevels to create a highly functional wharncliffe profile. A pronounced choil (scallop) in the heel of the blade provides a solid index finger purchase and, together with the contoured handle, offers a comfortable and secure four-fingered grip. The choil also places the blade’s edge in line with the knuckles of the hand to offer impressive cutting power for its size.

Spyderco’s Trademark Round Hole completes the package to support both easy one-handed opening and fingernail-friendly two-handed opening. Whichever method you prefer, we’re confident you’ll find the Equilibrium to be one of the most convenient, compact, and capable folding knives you’ve ever used."[1]


The C166 Equilibrium is made in Seki-City, Japan and features a:

SKU Handle Edge(s) Steel From/To MSRP Note Number made Grind Clip Clip positions Collectors club
C166 Stainless Steel PE VG-10 2013-2016 $154,95 (2016) While Spyderco never announced it was discontinued in their annual list, it was included in the discontinued pricing at several dealerships in 2016. It was still being included in 2019 at closeout pricing, so Spyderco must have had a large supply backlogged that they continue to distribute. Regular production Full Flat grind 4-way clip RH, LH, TU, TD, Main

Most collectible variation

Questions regarding collecting the C166

Some interesting questions we are looking for an answer to:

Questions with an answer:

Technical information

Measurements (mm and grams) of the C166 Equilibrium:

Variation Length overall Length closed Length blade Length edge Hole Ø Blade thickness Weight
C166 120mm 77mm 43mm 30mm 13mm 2.5mm 62g

Measurements (inches and ounces) of the C166 Equilibrium:

Variation Length overall Length closed Length blade Length edge Hole Ø Blade thickness Weight
C166 4.74" 3.05" 1.69" 1.20" 0.51" 0.098" 2.2oz


  1. The C166 Equilibrium in [1]


The C166 Equilibrium, opened and closed.

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