Amerian flag with knife

Pennsylvania Knife Laws

pnPennsylvania knife statutes are short and lacking in clear definitions. In order to determine what the law is, one must look at Court decisions, or case law. This article takes the statutes and the case law and puts it in a clear and organized manner that anyone can understand.

What is Legal to Own

  • It is legal to own Bowie knife
  • It is legal to own a Balisong, or butterfly knife
  • It is legal to own a penknife
  • It is legal to own a concealed knife, such as in a lipstick or belt buckle
  • It is legal to own any kind of hunting knife

What is Illegal to Own

  • It is illegal to own a dagger that opens automatically (spring, gravity, etc.)
  • It is illegal to own any automatic knife (though “assisted opening” is not classified as a prohibited offensive weapon)
  • It is illegal to own any implement for the infliction of bodily injury, which serves no “common lawful purpose”

Limits on Carry

  • It is legal to open or conceal carry any hunting knife
  • It is legal to open or conceal carry any knife that does not open automatically and has a lawful purpose
  • It is ILLEGAL to open or conceal carry any knife fitting the definition of “Prohibited offensive weapons”

What the Law States

§ 908.  Prohibited offensive weapons.

(a)  Offense defined. –A person commits a misdemeanor of the first degree if, except as authorized by law, he makes repairs, sells, or otherwise deals in, uses, or possesses any offensive weapon….

“Offensive weapons.” –Any bomb, grenade, machine gun, sawed- off shotgun with a barrel less than 18 inches, firearm specially made or specially adapted for concealment or silent discharge, any blackjack, sandbag, metal knuckles, dagger, knife, razor or cutting instrument, the blade of which is exposed in an automatic way by switch, push-button, spring mechanism, or otherwise…… or other implement for the infliction of serious bodily injury which serves no common lawful purpose…..

Implements to Inflict Bodily Injury and Common Lawful Purpose Defined

In 1975, the Supreme Court of Pennsylvania, set forth a “circumstances-of-the-possession” test, in Commonwealth v. Gatto, in order to determine if a weapon had a common lawful purpose. Mr. Gatto was arrested for having a thirty-inch knife during the early morning hours in the downtown area of Scranton. The Court held that the knife was an implement for the infliction of bodily injury, which served no common lawful purpose. In its ruling, the Court stated: “Had appellant been on a journey  through the tropical rain forests of South America, attempting to travel by foot from Bogota, Colombia to Caracas, Venezuela it could then be reasonably concluded that a thirty inch knife had a common lawful purpose; but appellant was in a high crime urban area of Scranton.”

Four years later, in Commonwealth v. Ashford, the Court state that Gatto should not be construed as setting forth a circumstances-of-the-possession test for determining whether an weapon served a common lawful purpose, saying the test had no place in determining whether there had been a violation of weapons possession code. Shortly after Ashford, in Commonwealth v. Fisher, the Supreme Court held that on a charge possessing or carrying a prohibited offensive weapon, the circumstances-of-the-possession test was inappropriate in determining whether the weapon served a common lawful purpose.

In 1980, in Commonwealth v. Artis, the Pennsylvania Supreme Court reversed Mr Artis’ conviction for possession of a prohibited weapon was reversed because the trial court improperly applied the circumstances of the possession test when determining whether the knife served a common lawful purpose. The knife was a folding knife, which Mr. Artis testified he purchased at a sporting goods store, to use for hunting and fishing. Therefore, it did not matter under what circumstances he possessed it, as it had a common lawful purpose.

More recently, in 1996, in the case of Commonwealth v. Karlson, the Court concluded that Mr. Karlson did not violate the prohibited offensive weapon statute when he sold four “Cobra” knives to an undercover police officer. The Court held that in order to convict Mr. Karlson, the state was required to offer evidence that the knives served no common lawful purpose. It said that unless they were specifically outlawed, knives were not objects of a criminal nature that were prohibited under the prohibited weapons statute.

Conversely, in 2007, in Commonwealth v. Alvarez, Mr. Alvarez’s possession of a two and a half foot long medieval-type battle-axe with a blade that was almost 10-inches long was held to be within the definition of a weapon that did not have a common lawful purpose.

Conclusion on Pennsylvania Knife Law

It is legal to open or conceal carry any type of knife in Pennsylvania other than those which fall into the category of “prohibited offensive weapon”.


  • 18 P.S. § 4416 (2013)
  • Commonwealth v. Gatto, 344 A.2d 566 (1975)
  • Commonwealth v. Ashford, 397 A.2d 420 (1979)
  • Commonwealth v. Fisher, 400 A.2d 1284 (1979)
  • Commonwealth v. Karlson, 674 A.2d 249 (1996)
  • Commonwealth v. Artis, 418 A.2d 644, (1980)
  • Commonwealth v. Alvarez, 935 A.2d 3, (2007)

*updated August 2018

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  1. So technically you could walk around with a katana in a sheif on your back and under definition it is legal in Pennsylvania? Asking for a friend

  2. I just got a Timber Rattler Scarab Giant Pocket Knife. It has an 8 inch blade. The knife is 9 inches when closed, and 17 inches total when opened. Even though it is technically a “pocket” knife which, despite it’s rare size, can still fit in certain pockets, are there any blade length laws in Pennsylvania that would prohibit you from carrying this particular unique pocket knife?

    1. Hey Jay;
      Thanks for the question. Just to be clear, I’m not a lawyer and I’m not allowed to give you “offiial” info which can only come from a legal professional in Pennsylvania, or a Police officer. To give you my take on your issue, I know that Police look at the issue of intent. If the implement in question appears to have no legal use other than to hurt people (throwing stars and brass knuckles) then it is not legal to carry them. Other knives fit the definition of deadly weapon (ballistic knives, daggers, etc.) would not be legal to carry. Exactly where the Timber Rattler fits is a question to be answered by local police authorities. To be safe, I wouldn’t carry it around, and if I need to use it on special occasions (wilderness camping, etc.) I would bring it on those occasions where you could make an argument to the authorities that you’ll need it in the backcountry. Those are just my thoughts.

    1. It is technically a button to open with a spring so no it isnt

    1. Hey Jess;
      As always, I’m not a lawyer so you should only take legal counsel from a Pennsylvania attorney. However, I couldn’t find anything that says machetes are illegal to own or carry. Only automatic opening knives, daggers and any sharp instrument which is made specifically to cause harm to someone (especially in a stealthfully sneaky way). That said, if you walk around with a machete on your belt in an area you would not ever normally need one (like a doctor’s office or grocery store), don’t be surprised if you are confronted by the authorities.

  3. I carry a 13 inch hunting knife I live outside of pittsburgh.what I I had to perform self defense how should I go about it so that I don’t get arrested in a situation where I need to protect my life and my family??

    1. Hey Freddy;
      Please note that I’m not a lawyer so don’t take my word for it. You’d have to ask a Pennsylvania attorney. However, as a friend, I can tell you that IF you or your family is in actual danger from someone who is obviously looking to harm/kill you, you would ultimately be justified in a court of law for using any implement (kitchen knife, machete, hockey stick or tennis racket) to disable your assailant. I talked to a friend of mine who is a police officer up in Canada about a situation like this many years ago, and he informed me that EVEN if a Canadian citizen used a handgun (which is 100% illegal to carry in all situations in every province) to kill an attacker in their home, the public outcry demanding justice (not simply compliance to the law), would be so great, that the shooter would not be charged with murder or charged for illegal possession of a firearm. U.S. laws are WAY more relaxed, permissive and lenient than Canadian laws, so in my humble opinion (as a friend, not a lawyer), I’d say you’re good! No worries!


  4. I know it states that it is legal to “own” a Bowie Knife, but what about as far as conceal/open carry goes? I do a lot of hiking so for example, if I go on a hiking trail in the woods, am I allowed to Conceal/Open carry a Bowie Knife? Can I Conceal/Open carry one in the city? Being even more specific, am I allowed to have it in my car or glove compartment on the way to the hiking destination? I just want to be sure on what locations, if any, are legal to carry one.

    1. The law states that it is illegal to carry a cane sword. What does the law say about other types of swords. I am a practitioner of martial arts. What does the law say if I’m stopped for a traffic violation and have a katana laying on the backseat of my car? I do have a Firearms carry permit if that makes any difference.

    1. About removing the blade. You may be able to drill out the pivot point and remove blade. But how about just dulling the blade and pointy bits? Use a grinder files and sand paper to round over the edges and point.


    Conversation with at State Cop. There is nothing stating double edge of anything. Daggers are completely legal, so long as you are not using them for Illegal purposes.

    Good summary:

    Generally though, if it is federal legal, it’s PA legal. This sums it up to Automatic Knives (switchblade), Gravity Knives, and Ballistic Knives.

  6. what kind of offense is this if you’re caught carrying an automatic knife with only like a 2.5 inch blade. I was considering purchasing the Smith & Wesson extreme ops automatic somethin. I just feel that an automatic would be the best way to go for me incase I’m ever put in a situation where I need to defend myself.

  7. Probably a dumb question but there’s a lot of law jargon and circle talk with court talk, I love in Philly and work as an overnight security guard can I carry a boot knife so I’m not totally unarmed?

    1. As far as PA goes, yes, assuming that it is not a dagger (double edge). However, I believe that Philadelphia does have local laws that prohibit the carry of knives in public unless they are required for your trade. So it sounds like you might be out of luck for knives.

  8. It’s important to remember in PA that there are State laws and municipal laws. I live close to the line of Franklin County and Cumberland County and knives that are perfectly legal in Franklin are NOT legal for carry in Cumberland. I can carry a Kershaw assisted opening knife in some areas but in other areas get arrested by local cops for it. I read about folks being arrested all the time over small Kershaws and similar knives. To be safe in PA in general, keep the blade 3″ or smaller and don’t carry assisted opening knives.

  9. W.R.Case & Sons Cutlery knives are made in Bradford, Pa. The knife pictured is a Case Bose Cattle Knife.

  10. What of throwing knives are they legal I didn’t see anything on them

  11. Some errors here.

    It is illegal to own a dagger
    It is illegal to own any automatic knife
    It is illegal to own a sword cane
    It is illegal to own any implement for the infliction of bodily injury, which serves no “common lawful purpose”

    All of the above are completely legal to own as a collector, they just cannot be carried. Collecting these edged odjects are a “common lawful purpose”. As a LEO, first responder or military personnel (on duty for military), you can carry an auto knife. Daggers are sold all over PA, and I did confirm with the CLEO here in Berks county, that they are perfectly legal to own. Just don’t get caught carrying any of them, regardless of whether you have a LTCF or not.

    Philly is the ONLY place in PA where it is illegal to carry any knife.

  12. Ok one question are karambits legal to own? And ia it legal to conceal/carry one in public?

  13. If I owned a business, an sold autos would it be a crime? I know you can get autos disassembled (knife separate) . but once put together in PA ,then its illegal correct?

    1. Autos are perfectly legal to sell and own in PA(Collectors), but you cannot carry them, unless you are a LEO or a first responder. Military personnel are also exempt when on duty. Same goes for daggers/dirks.

  14. What about a butterly knife trainers. It’s not technically a knife but it looks like one

    1. Balisongs are legal ”

      It is legal to own a Balisong, or butterfly knife”

    2. I’m in possession of one, is it nescessary to have a Collectorslicense for it?

  15. Are spring assisted stilettos illegal, not automatic ones , do they count as daggers? In PA

    1. Stiletto is an automatic knife. You press a button and it opens (via the spring). So yes stilettos are illegal in PA to own, carry!, or use. The word automatic was actually specifically added to cover stilettos.

    2. As Ted said… They make auto and manual Stilletto’s. So to clarify… Any knife that you press a button and the knife opens on its own without further human intervention…is illegal in PA.

  16. As much as I read about gun laws (especially prior to travel), I never really considered restrictive knife legislation. My wife and I are both “Preppers”. We keep a Get Home Bag in our vehicles at all times. Part of these survival kits are saw-back machetes. I don’t see them addressed here. So, if I get pulled over in Scranton, PA, will the cops say that I have no need for a machete because I’m not in the jungle? Scary!

  17. Lawfull purpose? Battle axes could be used for chopping fire wood!! Would have got my,lawyer to show a demonstration …BS charge

    1. Funny trivia: I have a friend in Denmark, and they have very strict laws about weapons, including pocketknives. However, battle axes are completely unrestricted because there’s no way to legally define the difference between a battle axe and a wood-cutting axe.

  18. Incorrect information all over the place here. It’s legal to own non-NFA “offensive weapons” for collection purposes, but illegal to carry them. The defense subsection specifically states that collection is legal, as long as it’s not an NFA item. Transporting NFA weapons is also legal as long as circumstances show that you did not intend to use the weapon in a crime, with specific examples including finding one lying around, or disarming an attacker. Note that all convictions are against people who were carrying very large knives in public, none against private collectors. And the “dagger” part refers only to automatic knives. “dagger, knife, razor or cutting instrument, the blade of which is exposed in an automatic way by switch, push-button, spring mechanism, or otherwise”

    1. Can you show me where it says the bit about having a concealed carry allowing you to carry other offensive weapons. I am interested.

    2. It doesn’t state it explicitly, only implies it.

      (b)(3) This section shall not apply to any person who makes, repairs, sells or otherwise deals in, uses or possesses any firearm for purposes not prohibited by the laws of this Commonwealth.

      “[O]therwise deals in, uses or possesses any firearm” is an incredibly wide-open clause, but like I said in the first post, I’m unaware of anyone testing it in court. As the law is currently written, simply possessing a legal firearm renders you exempt from the restrictions on offensive weapons (except for grenades, bombs, and incendiary devices, as the ban on those is pretty well set in stone). It LOOKS like the intention is to allow concealed firearm permit holders to carry other weapons (especially blackjacks, tasers, and other less lethal implements), but that’s just speculation. As it’s written, simply possessing a firearm should get you off the hook. You just need a really good lawyer to set that precedent.

    1. Any “hunting knife” can be carried openly or concealed.

    2. what in pennsylvania is considered a hunting knife. i have a blade that i carry that i did use for huting. it has a deer antler handle. it has not been used for huting purposes in a long time. would this be considered a hunting knife?

    3. The only knives which are prohibited by law are switchblades, knives with brass knuckles attached (because brass knuckles themselves are illegal), and any “other implement for the infliction of serious bodily injury which serves no common lawful purpose.” As long as it’s not one of those 3 things, it should be perfectly legal. Classifications like “pocket knife” or “hunting knife” only serve to illustrate that a particular knife serves a common lawful purpose. As long as you can realistically use it for hunting, it will most likely be considered to serve a common lawful purpose as a “hunting knife.”

    4. Thank you for this comment, I’ve been carrying around a brass knuckle knife for a good year now. Glad no one has tried me, because I don’t need that kind of trouble with the law for using that.

  19. Does that mean its illegal to carry around my katana …..cause I do.???

    1. from what i get from all the research that i have done as long as its single edged its fine i guess. i have not found any length restrictions. but would you get in trouble for carrying it i would say most likely. tho im intrigued as to how the hell your carrying a full length katana (that im assuming you conceal)

    2. well yes, I do carry a full length katana….most of the time it’s concealed, but other times it’s hanging from my waste or on my back. So far what I heard, is that it’s legal as long as your not using it for anything illegal #logic

    3. well,you never know when you will need to either split a watermelon or kill zombies,it has a law abiding purpose

  20. How does the PA law define a dagger? Is it a knife with both edges fully sharpened?

    1. yes a dual edged blade of any sort is considered a dagger

    2. Heartcall disagrees with Emmett (Heartcall posted above)

      ” And finally, the “dagger” part refers only to automatic knives. “dagger, knife, razor or cutting instrument, the blade of which is exposed in an automatic way by switch, push-button, spring mechanism, or otherwise.” An ordinary fixed blade dagger is not an offensive weapon, except to the degree (if any) it constitutes an “implement for the infliction of serious bodily injury which serves no common lawful purpose.” “

  21. You are allowed to own any knife at all. If you carry a switch blade and it is the only one that you own, you are in big trouble. If you have 20 of them in various types and would rather chew the throat out of an attacker than desecrate the knife with blood or a sharpening, you are safe. Knife collecting is a great hobby. You may carry a knife that is considered ‘assisted’, not an automatic. Considering how strong a folder has to be, I wouldn’t want to carry a switch blade. My Twitch is great for me.
    Be careful of blade size. That can get you in trouble.

  22. Automatic knives illegal to carry, yes…but own, I don’t think so under (b) as a curio collector

    Pennsylvania – Pa. C.S.A. 18.908. Prohibited offensive
    weapons. (a) Offense defined.–A person commits a
    misdemeanor of the first degree if, except as authorized
    by law, he makes, repairs, sells, or otherwise deals in,
    uses, or possesses any offensive weapon. (b) Exception.–
    It is a defense under this section for the defendant to
    prove by a preponderance of evidence that he possessed of
    dealt with the weapon solely as a curio or in a dramatic
    performance, or that he possessed it briefly in
    consequence of having found it or taken it from an
    aggressor, or under circumstances similarly negativing any
    intent or likelihood that the would be used unlawfully.
    (c) Definition.–As used in this section “offensive
    weapon” means… any… dagger, knife, razor or cutting
    instrument, the blade of which is exposed in an automatic
    way by switch, push-button, spring mechanism, or

    1. Doctor…need my CRKT M-16 in case I need to cracl a chest…or do emergency trach.

  23. It’s important to remember that Philly has its own ordinance on knives which pretty much outlaws carrying one unless you need it for work.
    Philadelphia Code §10-820. Cutting Weapons in Public Places.

    (1) Definition.

    Cutting Weapon. Any knife or other cutting instrument which can be used as a weapon that has a cutting edge similar to that of a knife. No tool or instrument commonly or ordinarily used in a trade, profession or calling shall be considered a cutting weapon while actually being used in the active exercise of that trade, profession or calling.

    (2) Prohibited Conduct. No person shall use or possess any cutting weapon upon the public streets or upon any public property at any time.

    (3) Penalty. The penalty for violation of this section shall be a fine of not less than three hundred (300) dollars and imprisonment of not less than ninety days.

    1. God doesn’t make the rules. Man does. I’m forever suspicious of anyone who tells me anything is a product of their god.

    2. I’m suspicious of anyone that doesn’t carry a knife!

    3. So your saying that there is no right to protect your life if I a man says so. When I see you in the streets you better be on your knees face down in the dirt when I a man walks by. How do you like the laws of man know, Suspicious Servent?? History never teaches the ignorant anything.

  24. Does a spring assist opening knife fall under the category of an automatic knife? IE; Kershaw Leek. Thanks GL

  25. Most recently in Commonwealth-v-Aultman 6049-2011, the District Attorney of Delaware County withdrew the charge of P.O.W. under Pennsylvania Law and RETURNED the 13″ knife to Mr. Aultman. It seems that the 13″ hunting knife Mr. Aultman was carrying in the sheath was completely LEGAL.

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