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An OTF Knife, also known as an out-the-front knife, sliding knife, telescoping knife, or angel blade, is a pocketknife with a blade that opens and closes through a hole in one end of the handle. This design contrasts with the majority of utility knives, which are either standard folding knives or are "fixed blade" sheath knives (having no mechanical operation).

"OTF" only refers to the basic portion of the knife's mechanical operation where the blade slides parallel with the handle to deploy.

Switchblades and gravity knives provide a great variety of different OTF mechanisms.

"Gentlemen's" OTF knives

Illustrated above are four very small OTF knives. Figure A shows simple rocking jaw type button, and Figure B is a roll-lock design. Both figures depict gravity knives that fall open. The leading edge of the roll cap or jaw acts as a hole cover when closed, and rests in a groove milled across the open blade tang in order to lock open.

Figures C and D are known as sliders or sliding knives. The knife blade must be pushed with the button along the length of the handle, finger pressure must overcome friction. The lock buttons on C & D are not automatic releases. Figure C is a Christy Cutter (trademark) ^[1] and Figure D is an antique design. The simplicity of sliding mechanisms have allowed some knife manufacturers to build extremely thin gentlemen's models, that are very comfortable to pocket.

Automatic OTF knives

An automatic OTF knife blade travels within an internal track or channel in the same manner as a manual slider or gravity knife, but the automatic main spring drive and button mechanism enclosed within the knife requires a switchblade handle to be thicker or longer than a similar size gravity or sliding knife. The term "Slider" is usually not applied to automatic knives.

There are two types of "Out the Front" automatic knives, DA-OTF (double-action) and SA-OTF (single-action). Double-action OTF knives deploy and retract with a multifunction button and spring design. Single-action OTF knives deploy automatically, but must be manually cocked or retracted to close.

Gravity OTF knives

A gravity OTF knife is also not considered a slider, because the blade extends outward by force of gravity or inertia, instead of finger pressure. The most famous gravity knife is the Fallschirmjaeger-Messer, or German paratrooper knife of World War II. The term gravity knife should primarily reference the Fallschirmjaeger-Messer as the archetypical example.

Spring-assisted gravity knives

Some civilian gravity OTF knives have a small helper spring to kick out the blade. This partial spring drive is not sufficient to classify this type of knife as a switchblade, because it does not drive the blade out to full lock.

Sheath-deployed telescoping knives

Another type of telescoping sliding knife is the Kershaw Ripcord. This is a sheath knife that partially retracts into the handle, and has a small scabbard cap covering the remaining blade tip. The design utilizes a specialized belt hanger/holsters that grasps the retracted blade so the blade is pulled fully open when unholstering. It is a unique compact fixed blade alternative. During the 1990s, a similar sheath-activated sliding knife with embossed Red Star handle was sold in the United States, claimed to be a police knife from the People's Republic of China. However, no proof of this assertion has been shown.

Roll-lock sliding knives

A roll-lock knife is a type of sliding knife in which the blade rides on a track running the length of the scales, tilting into a detent to lock open or closed. Examples would be the Benchmark Rollox, or its licensed derivative, the CRKT Rollock. Sliding knives like the Rollox are not considered inertia or gravity knife.

Spring-assisted out-the-front knives

Schrade and Smith & Wesson have both recently^[when?] introduced OTF knives that are opened by sliding forward a handle attached to the blade to engage the torsion spring. In the US, as it is classified as spring-assisted, it is not proscribed by the Federal Switchblade Act or most state laws on switchblades.

References

^ Details on the Christy Pocket Knife

The AKA, Automatic Knife Association Website
The AKTI, American Knife & Tool Institute standard knife definitions https://web.archive.org/web/20080514111826/http://www.akti.org/PDFS/AKTIDefinitions.pdf
Switchblades of Italy, by Zinser, Fuller, Punchard & Saltzman 2003 Turner Publishing ISBN 1-56311-933-1

[1] Details on the Christy Pocket Knife

[1]

Knives and daggers
List of daggers List of blade materials
Kitchen and table knives	Boning Boti Bread knife Butcher knife Butter knife Caidao Cheese knife Chef's knife Cleaver Electric knife Fillet knife Grapefruit knife Lame Mezzaluna Parmesan knife Pizza cutter Splayd Steak knife Tomato knife Japanese kitchen knives Deba bōchō Maguro bōchō Nakiri bōchō Santoku Sashimi bōchō Udon kiri Unagisaki hōchō Usuba bōchō Yanagi ba
Other knives	Aircrew Survival Egress Knife Athame Balisong/Butterfly Ballistic Ballpoint pen knife Bayonet Boline Bolo Boot knife Bowie Cane knife Ceramic knife Clip point Combat knife Commander Corvo CQC-6 Deba bōchō Diving knife Drop point Fairbairn–Sykes fighting knife Gerber Mark II Ginsu Golok Gravity knife Guna Hacking knife Higonokami Hunting knife Husa knife Ivan's Knife Jacob's ladder Karambit Kard Kirpan Kitchen knife Kukri Laguiole knife Machete Mandau Marking knife Misericorde Mora knife Multi-tool Navaja Neck knife Nontron knife Opinel knife Palette knife Pantographic knife Parang Penknife Penny knife Pesh-kabz Pirah Pocketknife Phurba Putty knife Puukko Rampuri Resolza Sabatier Sami knife SARK Scalpel Seax Sgian dubh Sharpfinger Sheath knife Shiv Sliding knife Smatchet SOG Knife Straight razor Strider SMF Survival knife Swiss Army knife Switchblade Taping knife Throwing knife Trench knife Tumi Ulu Utility knife Verlängerungsmesser Warrior knife Wedung X-Acto Yarara Parachute Knife Yatagan
Daggers	Anelace Applegate–Fairbairn fighting knife Arkansas toothpick BC-41 Bagh nakh Balarao Baselard Bichuwa Bollock dagger Cinquedea Dha Dirk Ear dagger Emeici Facón French Nail Gunong Hunting dagger Jambiya Jile Kabutowari Kaiken Kalis Katar Khanjali Khanjar Kris Kunai Liaoning dagger Mark I trench knife Microtech Jagdkommando Parrying dagger Poignard Pugio Push dagger Rondel dagger Seme Shobo Sica Stiletto Tantō U.S. Marine Raider stiletto V-42 Yoroi-dōshi
Manufacturers	Aitor Knife Company Al Mar Knives American Tomahawk Company Aritsugu Benchmade Böker Buck Knives Camillus Cutlery Company Cattaraugus Cutlery Company Chris Reeve Knives Chroma Cnife Clauss Cutlery Company Cobray Company Cold Steel Columbia River Knife & Tool Cuisinart Cutco Dalian Hanwei Metal Dexter-Russell Ek Commando Knife Co. EKA Emerson Knives F. Dick Fällkniven FAMAE Fiskars Gerber Legendary Blades Füritechnics Glock Ges.m.b.H. Imperial Schrade Ivan's Ka-Bar Kershaw Knives KitchenAid Korin Japanese Trading Company Kyocera Leatherman Mad Dog Knives Marble Arms Medford Knife and Tool Microtech Knives Morseth Muela Murphy Knives OLFA Ontario Knife Company Opinel Randall Made Knives Ranz Cuchillos Rösle Sabatier Shun Cutlery Slice, Inc. SOG Specialty Knives Spyderco STI Knives Strider Knives Thiers Issard TOPS Knives Tramontina Victorinox W. R. Case & Sons Cutlery Co. Carl Walther GmbH Wenger Western Knife Company Wilkinson Sword Wüsthof Yoshida Metal Industry Global Zero Tolerance Knives Zwilling J. A. Henckels
Knifemakers	Rex Applegate James Black Tom Brown Jr. Blackie Collins John Nelson Cooper Jack W. Crain Ernest Emerson Jerry Fisk Bill Harsey Jr. Phill Hartsfield Gil Hibben Jimmy Lile Bob Loveless William F. Moran Ken Onion Ralph Osterhout Bo Randall Chris Reeve A. G. Russell Jody Samson William Scagel Mike Snody Robert Terzuola Michael Walker Buster Warenski Daniel Winkler
Associations	American Bladesmith Society Cutlery and Allied Trades Research Association Knifemakers' Guild
Category:Knives / Daggers