Why are gravity knives illegal

April 20, 2023
legal gravity knives

We are glad to have you once again on our blog; you can be sure of another interesting ride as usual. Today we shall be looking into another interesting subject matter on Gravity Knives. We shall be diving into some aspects of law/legality of the gravity knife, and this is because we don’t want you to get into any troubles while you enjoy the use and benefits of your gravity knife.

To refresh our memories, we’ll answer the question of what a gravity knife is once more.

Gravity Knives

Gravity knives are a type of folding knife that can be opened with a flick of the wrist. They are similar to switchblades, but they do not have a spring mechanism that automatically propels the blade. Instead, they rely on gravity or centrifugal force to deploy the blade. Gravity knives have been around since the 1930s, when German paratroopers used them during World War II.

German Paratrooper Gravity Knives

Since then, they have become popular among various groups of people, such as tradespeople, hunters, and collectors. However, they have also been associated with crime and violence, and have been banned or restricted in many states and countries. In this blog post, we will explore the controversy over the definition and enforcement of gravity knife laws, the recent changes in some jurisdictions that have legalized or decriminalized gravity knives, and the implications for knife owners and users.

Legal issues on gravity knives

One of the main issues with gravity knife laws is the ambiguity and inconsistency of the definition of gravity knives. According to the federal Switchblade Knife Act of 1958, a gravity knife is a knife with a blade that is released from the handle by the force of gravity. It’s also described as a knife requiring the application of centrifugal force, which when release, is locked by using a spring, leaver or button.   However, this definition is vague and subjective, and can be applied to many common folding knives that are not intended to be gravity knives. For example, some courts and law enforcement agencies have used the “wrist flick test” to determine if a knife is a gravity knife. This test involves flicking the wrist while holding the knife to see if the blade opens. However, this test can vary depending on the skill and strength of the person performing it, the condition and design of the knife, and other factors. As a result, many people have been arrested or prosecuted for possessing ordinary knives that they needed for work or other legitimate purposes. In fact, a federal judge in New York ruled in 2019 that the state’s gravity knife law was unconstitutional because it was too vague and arbitrary. In contrast, some other states and countries have adopted more specific and objective definitions of gravity knives, such as requiring a certain blade length, shape, or mechanism.

Right after 1950, Gravity Knives and other small pocket knives became very common and popular amongst young gangsters. They were promoted generally and on the media as nice tools to have.

Lawmakers in the City of New York questioned these knives as they were also dangerous, this would subsequently result to the passage of a law to restrict and make the use of small knives and switchblades illegal in 1954

Sadly, in 1958 New York was not the only state to prohibit the use of these knives. A couple of states like Colorado included other small pocket knives in the banned categories by labelling them as gravity knives. 

Not long after many more states started reviewing small pocket knives as risky tools to be carried about and the notion that those who carry such knives about are likely criminals or gang members.

Between the year 2000 and 2012 thousands of citizens were arrested in New York and almost all of them were in possession of the knife for job related purposes.

legal gravity knives

Ohio State for instance is having a reconsideration of their laws. Gravity knives and Switchblades are still illegal in most states today.

The types of knives considered forbidden and places where they are prohibited varies from state to state and country to country. This makes it wise and necessary to check the state laws and country you intend to travel to before deciding to buy a gravity knife or travel along with one.  

In German, knife law: Any kind of OTF knives are strictly banned. If travelling to Germany, do not go along with one, only with official permit. 

In the UK, it’s illegal to be in possession of any shape or bladed instruments in places, such instruments includes Gravity knives, switchblades, and butterfly knives, flick knives etc. There may be a few exceptions with good reasons or legal backing. 

In Spain, Forbidden knives are knives that are not recognizable. These are automated and semi-automated knives, folding knives over 4.3”/11cm in length and flipper knives. Daggers are prohibited if they have a blade sharpened on both sides and Butterfly knives too.

In Poland, a knife is considered a utility tool and not treated as a weapon, it’s not treated as a white weapon and therefore not subject to the Weapons and Ammunition Act of May 21, 1999. One can easily purchase and be in possession of a spring knife, butterfly knife, knife with a fixed button and folding knife.

gravity knives illegal              

In response to the criticism and challenges of the gravity knife laws, some jurisdictions have recently changed their laws to legalize or decriminalize gravity knives. For example, in 2019, New York Governor Andrew Cuomo signed a bill to remove gravity knives from the category of deadly weapons and allow their possession. This bill was passed unanimously by the state legislature, after seven years of lobbying by lawmakers and advocates. The governor cited a federal court decision that found the gravity knife law to be unconstitutionally vague and discriminatory. He also acknowledged the impact of the law on workers and artisans who use gravity knives for their jobs. Similarly, in 2017, Colorado Governor John Hickenlooper signed a bill to repeal the ban on switchblades and gravity knives, after hearing testimony from knife enthusiasts and collectors. He said that the ban was outdated and unnecessary, and that it did not enhance public safety. He also noted that the ban hurt Colorado’s reputation as a friendly state for outdoor recreation and tourism. These changes reflect a growing recognition that gravity knives are not inherently dangerous or criminal, and that they have legitimate uses and benefits for many people.

gravity knife

Having highlighted some issues bordering of knife laws, especially with regards to the gravity knife, one would naturally want to know, how then can I make use of my gravity knife, enjoy its many benefits without getting in the way of the law.

• Be clear about the definition of a gravity knife in your location or intended travel destination

• Be sure that gravity knives are prohibited or not by law in your location.

• Your gravity knife should serve as a utility tool and not for any unlawful acts.

• Be sure if you require a legal permit in your location before possessing and making use of a gravity knife; if so secure such permits from the relevant authorities.

• Remain law abiding

With every tool, instrument or device that makes for ease of work and or other routine activities, certain precautions should be taken to prevent operational hazards, while maximizing the benefits thereof. This brings us to our next point of discuss.

gravity knives laws

Safety tips for using gravity knives

Your fingers should not cross the blade whilst you open or close your gravity knife.

When not in use, ensure the blade in securely locked, using the lock button or leaver provided.

When deploying the blade, do not point it towards yourself or anyone else. Make use of centrifugal force or gravity to open the blade. Whilst at this, do not flick it too fast or too hard.

Make sure you utilize your gravity knives only for the intended purpose, such as cutting, slicing or piercing, Do not use them for prying, hammering , or throwing,

Keep your gravity knife clean and sharp. A dull or dirty blade can cause more injuries and damage than a sharp one. Use a sharpening stone or a honing rod to maintain the edge of your blade.

Always store your gravity knife properly when not in use. Use a sheath, a block, a rack, or a magnetic strip to keep your knife away from children, pets, and other hazards. Do not leave your knife in your pocket, in a sink, or on a surface where it can fall or be knocked over.

FAQ on Legality of a Gravity Knife


Is a gravity knife considered the same as a switchblade in the eyes of the law?

In many places, yes. Laws often group gravity knives and switchblades together due to their quick-opening mechanisms. However, specifics can vary by jurisdiction.

Where can I check if it’s legal to own or carry a gravity knife in my area?

Your local police department or city’s website often has information on weapon regulations. Otherwise, a local attorney or knife enthusiast group can be a good resource.

If gravity knives are banned in my state, are there any exceptions to the rule?

Some states may allow exceptions for professional use, like by tradespeople or artisans, but this varies. Always consult local statutes or legal experts for clarity.


Gravity knives are a type of folding knife that can be opened with a flick of the wrist. They have a long and controversial history, as they have been banned or restricted in many states and countries due to their association with crime and violence. However, they have also been legalized or decriminalized in some jurisdictions, as they have been recognized as useful and versatile tools for various purposes. Gravity knife owners and users should be aware of the local laws and regulations regarding gravity knives and other types of knives, as they can vary widely and change over time. They should also exercise caution and responsibility when using gravity knives, as they can be dangerous if not handled properly or safely. Gravity knives are not for everyone, but they can be a great addition to your knife collection if you know how to use them correctly. What do you think about gravity knives?

If you own a gravity knife or would like to own one, we welcome you to share your experience and thoughts about gravity knives, in the comment section of this blog post.

To learn more and enrich your knowledge about gravity knives and a host of other knives we welcome you to our Knife Blog. And to buy the best set of knives at the most reasonable prices we invite you to Our Exceptional World of custom knives NOBLIE COLLECTIBLES. 


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  • BladeLawyer101

    Really insightful article on the legalities surrounding gravity knives. I’ve always wondered why they faced such strict regulations compared to other types of folding knives. The history and politics behind it are truly intriguing. Does anyone know if there are movements or petitions to re-evaluate these laws?

  • Jasmine Thompson

    Hi Dear! What is the most forbidden knife? Which knife is considered the most prohibited or restricted in many jurisdictions around the world?


    The concept of a “most forbidden” knife can be somewhat subjective, as knife laws vary significantly across countries and even within regions of those countries. However, based on widespread restrictions and regulations, a few types of knives often face prohibitions or stringent controls:

    Switchblades/Automatic Knives: These are knives that open automatically at the press of a button or mechanism. Many jurisdictions around the world ban or heavily regulate the possession, sale, or carry of switchblades due to concerns about their rapid deployment.

    Balisong/Butterfly Knives: These are folding pocket knives with two handles that counter-rotate around the tang. When closed, the blade is concealed within grooves in the handles. Due to their flashy opening technique and potential for rapid deployment, many places prohibit or restrict them.

    Gravity Knives: As previously mentioned, gravity knives have faced prohibitions in many jurisdictions, mainly due to concerns similar to those regarding switchblades.

    Push Daggers: These knives have a T-shaped design, where the blade comes out perpendicular from the handle and is held by the fist. They’re designed primarily for stabbing and are restricted in many places.

    Concealed/Disguised Knives: These are knives hidden within everyday objects such as pens, belts, or canes. Their concealed nature often leads to their prohibition in many jurisdictions because they can be carried without detection.

    Dirks and Daggers: These are typically double-edged stabbing tools. Some places, especially within the United States, have restrictions on carrying fixed-blade knives like dirks and daggers concealed on one’s person.

    It’s essential to note that cultural perceptions, historical incidents, and regional concerns can influence the legal status of various knife types. For instance, in the UK, there’s a particular concern about knives used in violent crimes, leading to stricter knife carry laws in general.

    Always consult local laws and regulations if you are considering owning or carrying a knife, especially when traveling. Even within countries, laws can differ significantly from one region to another.

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