Case Knives and the Case XX Trademark

Case knives are also known internationally as Case XX. The traditional XX trademark dates back to the two-stage heat treatment and quality inspection of the blades and is now one of the best-known hallmarks of the American knife brand.

Since 1889, W.R. Case & Sons Cutlery Company has been known for traditional American pocket knives and fixed blades. Based in Bradford, Pennsylvania, the company combines classic patterns such as the Trapper, Stockman, and Barlow with a wide selection of handle materials and finishes. The range extends from reliable everyday knives to limited editions and highly collectible models.

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CPM-20CV

A high-quality, powder-metallurgical stainless tool steel that offers impressive performance, wear resistance, and edge retention, and provides corrosion resistance thanks to its elevated chromium content. Blades made of CPM-20CV steel are featured in the Longhouse® and Highbanks® models, which are part of the Bridgeline series.

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Carbon Steel (CS)

The 1095 Carbon Steel belongs to a class of steel in which carbon is the most important alloying element, giving the steel high tensile strength, wear resistance, and toughness. CS steel is very similar to CV blades and is also known for its edge retention and ease of resharpening; however, compared to stainless steel, it is prone to tarnishing and rusting when exposed to air and moisture. A thin layer of oil preserves the steel’s original appearance and ensures many years of reliable service.

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Chrome Vanadium (CV)

1095 steel is a high-carbon steel that contains a small amount of chromium for improved hardenability and vanadium to aid in the bonding process. This type of steel is known for holding its edge well and being easy to sharpen. It is important to note that CV steel is not corrosion-resistant and therefore tends to tarnish and rust when exposed to air and moisture. These blades must be kept clean and coated with a thin film of light oil to prevent rust or discoloration. CV blades darken over time and develop a beautiful patina, even when well maintained. Over 135 years ago, this type of steel was the original material used for Case knives.

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Damascus (DAM)

The production of Damascus steel is a tradition that dates back to the time of the Crusades and is named after the famous Syrian city where some of the first artificially produced metals were publicly traded. It consists of thin layers of metal that are heated together to form a laminated solid. The patterns are created by folding the layers and then fusing them together through forging. Over the years, Case has opted for both carbon damascus steel and stainless damascus steel blades in various knife projects. Case began using damascus steel in 1989.

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S35VN

A tough, wear-resistant steel based on chromium-vanadium. It is a further development of the second generation of S30V steel. Experienced knife makers report that S35VN is easier to machine due to the addition of niobium in the steel composition. After annealing, S35VN machines well on CNC machines, making it the ideal choice for manufacturing high-performance blades. Blades made from S35VN offer excellent edge retention as well as resistance to chipping and breakage. You’ll find this steel in modern EDC knives such as the Marilla® and the Kinzua®, as well as in the Crossroads™ series, including the XR Sod Buster® Jr. and the XR Barlow.

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154CM

A high-performance stainless steel alloy manufactured in the U.S. that is known for its sharpness and edge retention. It is produced with very low levels of impurities and combines three main elements: carbon, chromium, and molybdenum. The increased carbon and chromium content improves the steel’s hardness and rust resistance. However, resharpening may require additional effort. Case has offered 154CM steel grade since 2008; it is used in collaborations with custom knife makers and other specially selected knife projects.

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Nitro-V

The fine carbide structure of NITRO-V steel gives it toughness, excellent rust resistance, and versatility. NITRO-V steel is used in one of Chris Taylor's modern fixed-blade knives.

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Stainless Steel (SS)

A steel alloy with a high chromium content that offers superior corrosion resistance compared to conventional steel. Blades made from this material retain their sharpness longer and are exceptionally durable. This type of steel requires minimal maintenance and is significantly more resistant to rust and tarnish than other steels. Case has been using this steel since 1916. It is the most commonly used steel at Case and is known as Tru-Sharp™ Surgical Steel (SS).

knives with this steel