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For other definitions, see Sark (disambiguation) SARK "Emerson SARK" Type Folding Knife Place of origin Torrance, California, USA Service history In service US Navy Used by Navy Special Boat Units Wars War on Terror, Operation Iraqi Freedom Production history Designer Ernest Emerson Designed 1999 Manufacturer Emerson Knives, Inc. Produced 1999 through present Number built 3,000+ Variants P-SARK(pointed tip), NSAR(line cutter on blade spine) Specifications Length 8.2 inches (210 mm) Blade length 3.5 inches (89 mm) Blade type Wharncliffe Hilt type G-10 laminate and 64AVL Titanium Scabbard/sheath Pocket Clip The SARK (Search and Rescue Knife) or NSAR (Navy Search and Rescue) is a folding knife designed by Knifemaker Ernest Emerson for use as a Search and Rescue knife for the US Military. It features a wharncliffe blade with a blunt tip in order to cut free trapped victims without cutting them in the process. A variant with a pointed-tip designed for police use exists, known as the P-SARK (Police Search and Rescue Knife). Contents 1 History 2 Specifications 3 References 4 External links // History After a helicopter crash in 1999, which resulted in the deaths of six Marines and one sailor, the United States Navy performed an assessment of their equipment and decided, among other things, that they needed a new search and rescue knife.[1][2] The Ka-bar knives issued to the SBUs (Special Boat Units) had catastrophically failed to cut the Marines free from their webbing.[1] The Navy went to Emerson Knives, Inc., where the owner, Ernest Emerson, designed and fabricated a working prototype within 24 hours.[1] The Navy found that the knife met their needs, and the model was dubbed the "SARK" (Search and Rescue Knife).[2] The SARK is a folding knife with a wharncliffe-style blade and a blunt tip designed so a rescuer could cut trapped victims free without stabbing them. Seeing another need in the police community, Emerson replaced the blunt end of the SARK with a pointed end and named it the "P-SARK", or Police Search And Rescue Knife. The Ontario, California Police Department consulted Emerson to produce written policy for the carry and deployment of the P-SARK knives in their department.[3] In 2005, the Navy changed the requirements on the SARK to incorporate a guthook on the back of the blade for use as a line-cutter.[4] Emerson made the change on this model, which was designated the NSAR (Navy Search And Rescue) Knife and only made available to the United States Navy.[4] Specifications The SARK, PSARK, and NSAR, like all of Emerson's knives are made in the USA. All three models feature a wharncliffe shaped chisel-ground blade that is 3.5 inches (89 mm) long and hardened to a Rockwell hardness of 57-59 RC. The handle is 4.7 inches (120 mm) long, making the knife 8.2 inches (210 mm) in length when opened. The blade steel is Crucible's 154CM and is 0.125 inches (3.2 mm) thick. The butt-end of the knife is square-shaped and features a hole for tying a lanyard. Some models are made with partially serrated blades to aid in the cutting of seatbelts or webbing. The handle material of the SARK is composed of two titanium liners utilizing a Walker linerlock and a double detent as the locking mechanism. The reasons for using titanium as a linerlock material were due to its exceptional strength-to-weight ratio and corrosion resistance.[5] The handle's scales are made from black G-10 fiberglass, although models were made for a few years utilizing green G-10. A pocket clip held in place by three screws allows the knife to be clipped to a pocket, web-gear, or MOLLE. Each model is equipped with Emerson's Wave opening mechanism.[1] The Wave is a small hook on the spine of the blade designed to catch the edge of a user's pocket, opening the blade as the knife is drawn.[6][7] References ^ a b c d Combs, Roger (2004), "Emerson Knives", Knives Illustrated 18 (2): 36–41, 65–69 ^ a b Covert, Pat. "Strike Force!" American Handgunner, January 2000. Available at, Retrieved on May 5, 2009 ^ Griffith, David (2002), "On the Cutting Edge", Police Magazine 10 (2): 68–75  ^ a b Rescue and Survival Equipment Manual, NAVAIR 13-1-6.5, Naval Air Systems Command, Washington, D.C., February 2007 ^ "Titanium Alloys – Corrosion and Erosion Resistance". The AtoZ of Materials:Materials Information Service – The Selection and Use of Titanium, A Design Guide. Retrieved May 5, 2009.  ^ Emerson, Ernest R. "Self Opening Folding Knife". US Patent. Retrieved May 5, 2009.  ^ Overton, Mac (2007), "Knives Inspired by the World's Most Popular Combat Rifle", Knives Illustrated 21 (1): 16–20  External links Emerson Knives Homepage v • d • e Knives and daggers List of daggers · List of blade materials Types of knives Aircrew Survival Egress Knife · Athame · Balisong · Ballistic · Bayonet · Boline · Bolo · Boning · Boot knife · Bowie · Bread knife · Cane knife · Cheese knife · Chef's knife · Cleaver · Combat knife · Commander · Corvo · CQC-6  · Dagger · Deba bocho · Electric knife · Fairbairn-Sykes Fighting Knife · Flick knife · Gerber Mark II · Ginsu · Grapefruit knife · Gravity knife · Hunting knife · Jacob's ladder · Karambit · Kīla · Kirpan · Kitchen knife · Kukri · Laguiole knife · Machete · Mandau · Mezzaluna · Misericorde · Mora knife · Multi-tool · Nakiri bocho · Navaja · Opinel knife · Palette knife · Pantographic knife · Penknife · Penny knife · Pocket knife · Putty knife · Puukko · Rampuri · Rondel dagger · Sabatier · Santoku · SARK · Scalpel · Seax · Sgian dubh · Sharpfinger · Sheath knife · Shiv · Sliding knife · SOG Knife · Straight razor · Survival knife · Swiss Army knife · Switchblade · Taping knife · Throwing knife · Tomato knife · Trench knife · Tumi · Ulu · Utility knife · X-Acto · Yanagi ba Types of daggers Anelace · BC-41 · Bagh nakh · Baselard · Bichawa · Billao · Bollock dagger · Cuchillo De Paracaidista · Cinquedea · Dirk · Ear dagger · Facón · Hachiwara · Hunting dagger · Jambiya · Kaiken · Kalis · Kard · Katara · Khanjar · Kris · Parrying dagger · Poignard · Push dagger · Seme · Shobo · Sica · Stiletto · Tantō · Marine Raider Stiletto · V-42 Stiletto · Yoroi tōshi Knife manufacturers American Tomahawk Company  · Benchmade · Brusletto · Buck Knives · Calphalon · Camillus Cutlery Company · Cattaraugus Cutlery Company · Chris Reeve Knives · Cold Steel · Columbia River Knife & Tool · Cuisinart · Cutco Cutlery · DOVO Solingen · Dexter-Russell · Emerson Knives, Inc. · Ek Commando Knife Co. · F. 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