Automatic Knife Laws by State: What to Check Before You Buy
Before you buy an automatic knife, you need to know whether you can legally own it, carry it, and have it shipped to you. Automatic knife laws vary widely by state, and federal law adds another layer.
This guide explains what counts as an automatic knife, what federal law covers, how a few state statutes differ, and how to check your state and city rules. It is general information, not legal advice.
What Counts as an Automatic Knife?
An automatic knife opens its blade with stored spring power when you press a button, lever, or switch on the handle. You do not swing or push the blade open yourself. Most laws use that difference to separate automatics from ordinary folders, though the exact wording changes from statute to statute.
Push-Button Side Openers and OTF Knives
A side-opening automatic swings the blade out of the handle when a button releases the spring, much like a folder opening on its own. An OTF (out the front) knife fires the blade straight out of the front of the handle, and double-action models retract it the same way.
Both usually fall under legal terms like “switchblade” or “automatic knife.” For the mechanical side, see our guides to out-the-front knives and the switchblade vs. OTF difference.
Assisted-Opening and Gravity Knives
An assisted-opening knife needs you to start the blade moving with a thumb stud or flipper before a spring finishes the job. Federal law treats that design differently: the federal switchblade exceptions in 15 U.S.C. § 1244 exclude knives with a spring or detent that biases the blade toward closed and requires hand, wrist, or arm effort to open. Congress added that exception in 2009.
Gravity knives are a separate case. The federal definition of a switchblade in 15 U.S.C. § 1241 also covers blades that open by gravity or inertia, along with button-release designs. Some states also name gravity knives in their own statutes, so check a gravity knife’s status separately instead of assuming folder rules apply.
What Does Federal Law Restrict?
Federal switchblade law mainly targets interstate commerce, not everyday carry inside a state. It makes it a federal crime to knowingly introduce, make for introduction, transport, or distribute switchblade knives in interstate commerce, under 15 U.S.C. § 1242.
Interstate Commerce vs. Personal Carry
Federal law also bans making, selling, or possessing a switchblade in a few places under federal control, including U.S. territories and possessions, Indian country, and federal maritime and territorial jurisdiction, under 15 U.S.C. § 1243. Outside those places, state and local law mostly governs day-to-day ownership and carry.
The federal exceptions also cover common carriers shipping in the normal course of business, Armed Forces contracts and duties, and a person with only one arm carrying a switchblade with a blade of 3 inches or less.
Why Federal and State Rules Must Be Checked Separately
Federal and state laws answer different questions, so clearing one does not clear the other. A knife can move legally under federal rules and still be restricted the moment you carry it in a state with its own limits.
Check both layers: the federal rules on how the knife moves between states, and the state and city rules on what you can do with it once it is in your hands.
How Do Automatic Knife Laws Differ by State?
States range from no automatic knife ban at all, to sale-only limits, to outright possession bans. The examples below come from the statute text itself. They are a sample, not a full 50-state list, and any statute can change after this was written.
States Where the Weapons Statute Doesn’t List Them
Oklahoma’s carry statute, 21 O.S. § 1272, does not mention switchblades, automatic knives, or any blade length. It restricts firearms and “any blackjack, loaded cane, hand chain, metal knuckles, or any other offensive weapon,” and it carves out the proper use of guns and knives for self-defense, hunting, fishing, educational or recreational purposes.
States also change course. Pennsylvania’s Act 119 of 2022, approved November 3, 2022, struck automatic-opening knives from the state’s definition of “offensive weapons” in 18 Pa.C.S. § 908, effective 60 days after approval.
States That Limit Sales but Not Possession
Some states regulate the sale of automatic knives more than they regulate ownership. Maryland’s Criminal Law § 4-105 makes it a misdemeanor to sell, barter, display, or offer to sell a switchblade or shooting knife. That section does not address possession, so check Maryland’s other weapons laws before you carry one there.
States With Possession Bans or Narrow Exceptions
Minnesota makes it a crime to manufacture, transfer, or possess “a switchblade knife opening automatically,” under Minn. Stat. § 609.66.
New York lists switchblade knives in its fourth-degree criminal possession of a weapon law, a class A misdemeanor, under N.Y. Penal Law § 265.01. New York does carve out possession of a switchblade for use while hunting, trapping, or fishing by a person carrying a valid license, under N.Y. Penal Law § 265.20.
These examples show why one label like “legal” or “banned” rarely tells the whole story. Always read your own state’s current statute.
Does Legal Ownership Mean You Can Carry the Knife?
No. Legally owning an automatic knife does not always mean you can carry it in public. Many states treat owning, carrying, and selling as separate questions. A knife that is fine in a drawer at home can be restricted once it goes into a pocket or bag.
How Open and Concealed Carry Differ
Many states write separate rules for open and concealed carry. A knife may be allowed on your belt in plain view but restricted when hidden in a pocket, or vice versa. Read the carry section of your state’s weapons law, not just the part that defines the knife.
When Blade Length, Age, or Eligibility Matters
Some states set blade length limits, minimum ages, or eligibility requirements for carrying an automatic knife. These details change when legislatures act, so take them from the current statute text, not from an older summary or a forum post.
How City Rules and Restricted Places Change the Answer
Cities and counties can add their own knife rules in some states, while other states block local rules through preemption. Certain places, like schools, courthouses, and secure government buildings, often have their own weapons restrictions regardless of the general carry law.
How Should You Check the Law Before Buying?
Read your state’s current statute, then check your city or county code. General summaries can help you find the right section, but the statute text is what counts.
Find the Current State Statute and Local Ordinances
Start with your state legislature’s official code website, where statutes are posted and updated. Search for terms like “switchblade,” “automatic knife,” “gravity knife,” and “dangerous weapon,” since states use different labels. Then check your city or county code for local additions.
Check Sale, Shipping, and Travel Rules Separately
Buying, carrying, and traveling are three different legal questions. A knife legal to own at home may be restricted when you carry it, and crossing a state line can change the rules entirely.
If you plan to travel with an automatic knife, check the law in every state you will pass through, not only your home state, and check airline and airport rules before you fly.
Frequently Asked Questions
In what states are automatic knives legal?
It depends on the state, and the list changes over time. Some states’ weapons statutes do not mention automatic knives at all, like Oklahoma’s 21 O.S. § 1272. Others limit sales, like Maryland, or ban possession, like Minnesota. Pennsylvania dropped automatic knives from its offensive weapons list in 2022. Check your own state’s current statute rather than a list that may be out of date.
Is it legal to own an automatic knife?
In many states, yes, but not everywhere. Minnesota bans possession of switchblades, and New York lists them in its criminal possession law with a narrow exception for licensed hunting, trapping, and fishing. Maryland’s switchblade statute targets selling and displaying rather than owning. Read both your state’s possession rules and its carry rules before you buy.
Is an OTF knife illegal to carry?
Not everywhere. Whether you can carry an OTF knife depends on your state and sometimes your city. Most laws treat OTF knives as automatic knives or switchblades, so the same rules usually apply. Some states allow carry with conditions such as blade length or concealment limits, while others restrict possession entirely. Check your current state statute and local code.
Can you still buy a switchblade?
Yes, in states that allow them. Federal law mainly restricts moving switchblades through interstate commerce, not buying one where your state permits it, and it exempts assisted-opening knives. Before ordering, confirm that your state allows you to receive, own, and carry the knife, and check any city rules that apply where you live.
Are switchblades legal in Oklahoma?
Oklahoma’s carry statute, 21 O.S. § 1272, does not list switchblades or automatic knives, and it sets no blade length limit. It does restrict “any other offensive weapon,” and it protects the proper use of knives for self-defense, hunting, fishing, educational, or recreational purposes. Cities and specific places like schools can have their own rules, so check local codes too.
Find Your Carry
Know your local rules and ready to choose? Sharp Things OKC stocks automatic knives from side-openers to double-action OTFs. Stop by our N May Ave store to compare mechanisms in hand, or order online, where orders placed before 3 pm usually ship the same day.
