TSA Rules for Carrying Tools on a Plane: What's Allowed and What Gets Confiscated

You're racing through the airport, laptop bag over one shoulder, a small toolkit in your carry-on from a job site you just left. You step up to the security conveyor, bag goes through the X-ray, and then — a pause. The agent pulls your bag aside. Sound familiar?

Every year, the TSA confiscates hundreds of thousands of items from travelers who genuinely did not know a tool was prohibited in the cabin. TSA rules for tools in carry-on bags are specific, sometimes surprising, and just unforgiving enough to ruin your morning. The good news: most of the rules are straightforward once you know them, and knowing them in advance can save you a $40 multi-tool and a 20-minute delay at the checkpoint.

This guide covers everything you need to know about TSA tool regulations — what you can bring in the cabin, what must go in checked luggage, the grey-area items that trip people up most, and exactly what to do if something gets taken. Whether you're a contractor flying between job sites, a frequent business traveler, or just someone who accidentally left a pocket knife in their bag, this is your definitive reference.

How TSA Tool Rules Actually Work

The TSA operates under federal law and the guidelines set by the Department of Homeland Security. The agency publishes its rules publicly at TSA.gov, and they maintain a searchable "What Can I Bring?" tool that covers thousands of items. But the rules aren't always intuitive — an item that is perfectly legal to own and carry in a pocket on the street can be federally prohibited the moment you attempt to bring it past a security checkpoint.

The core logic behind what tools are allowed on an airplane comes down to two questions: Can this item be used as a weapon to threaten crew or passengers? And does the item have a blade or sharp point that could cause serious injury in a confined space? If the answer to either is yes, it generally does not belong in the cabin.

TSA officers have the final authority at the checkpoint. Even if an item is technically on the "allowed" list, a screener can still prevent it from going through if they believe it poses a security risk. Keep that in mind — rules on paper are the baseline, not a guarantee.

Tools Allowed in Carry-On Luggage (With Size Limits)

The following tools are permitted in carry-on bags according to official TSA guidelines — but pay close attention to the size restrictions. Exceeding those limits by even a fraction of an inch can result in confiscation.

Screwdrivers — Allowed Under 7 Inches

Screwdrivers are allowed in carry-on bags as long as the total length does not exceed 7 inches. This includes the handle. A standard compact flathead or Phillips-head screwdriver typically falls within this range, but longer handle screwdrivers or heavy-duty varieties often do not. When in doubt, measure before you pack. Cordless electric screwdrivers are a different matter — see the lithium battery rules below.

Pliers — Allowed

Standard pliers, needle-nose pliers, and similar gripping tools are permitted in carry-on bags with no stated length restriction from the TSA. However, because individual screeners have discretion, very large or heavy pliers may attract scrutiny. Keep them compact and you will generally pass without issue.

Wrenches and Spanners — Allowed Under 7 Inches

Like screwdrivers, wrenches are permitted in carry-on luggage when they are 7 inches or shorter in total length. Adjustable wrenches, socket wrenches, and box-end wrenches all fall under this rule. Full-size pipe wrenches, torque wrenches, and anything over 7 inches must be checked.

Multi-Tools Without Blades — Allowed

This is one of the most commonly asked questions in TSA rules. A multi-tool that contains no blade is allowed in carry-on bags. If the same multi-tool includes a knife blade — even a small one — the entire item must be placed in checked luggage. The presence of any blade, regardless of length, is what triggers the prohibition. If you own a multi-tool with a blade, either pack a blade-free version for travel or put the whole device in your checked bag.

Scissors — Allowed With Blade Under 4 Inches

Scissors with blades shorter than 4 inches from the pivot point are permitted in carry-on bags. Scissors with longer blades, or those with pointed tips that are sharp rather than rounded, must be checked. Craft scissors, small nail scissors, and most travel scissors qualify. Tailor's shears and kitchen scissors almost certainly do not.

Other Allowed Tools

• Hammers under 7 inches in length
• Allen keys / hex keys (small sets are generally fine)
• Measuring tape
• Levels
• Wire nuts and electrical connectors (no sharp protrusions)
• Cable ties / zip ties

Tools Prohibited in Carry-On Bags (Checked Luggage Only)

The following tools are never permitted in carry-on luggage regardless of size, brand, or intended use. All of them must be packed in checked baggage — and even then, some have special handling requirements.

Knives — Any Blade Length

Knives of any type and any blade length are prohibited in carry-on bags. This includes pocket knives, hunting knives, folding knives, Swiss Army knives with blades, and fixed-blade knives. The 2013 proposal to allow small knives was withdrawn — the rule remains a blanket prohibition. All knives must go in checked luggage, secured so they cannot cut through the bag or injure baggage handlers.

Box Cutters and Utility Knives

Box cutters, Stanley knives, and retractable utility blades are prohibited in carry-on bags. These were specifically cited in post-9/11 security reforms and are among the most strictly enforced items on the list. No exceptions.

Ice Picks and Awls

Any tool with a sharp, pointed spike — including ice picks, awls, and similar pointed hand tools — is prohibited in carry-on luggage because of its potential as a stabbing weapon. These go in checked bags.

Saws

All types of saws are prohibited in carry-on bags, including hand saws, hacksaws, and folding saws. Even a small folding camping saw is not permitted through the checkpoint. Electric or cordless saws, in addition to being prohibited as bladed tools, often also contain large lithium batteries, which creates further complications for checked bag shipping — check airline policies for those specifically.

Drills and Drill Bits

Cordless drills and power drills are prohibited in carry-on bags. Drill bits are also prohibited in carry-on bags regardless of size, as they are considered sharp pointed objects. If you are traveling with a drill kit, the entire kit — drill, bits, charger, and battery — must be checked. Note that many airlines have restrictions on lithium batteries in checked bags as well, so review your specific carrier's battery policies.

Crowbars

Crowbars and pry bars are prohibited in carry-on bags. Their size alone would likely raise questions, but the TSA explicitly lists them as checked-bag-only items.

Additional Prohibited Tools

• Cattle prods and stun guns (prohibited in carry-on; allowed in checked with conditions)
• Nail guns
• Bolt guns / powder-actuated tools
• Wire cutters with large blades
• Chisels (sharp-edged; always check with TSA's What Can I Bring? tool)

Grey-Area Items: How TSA Agents Make Decisions

Some tools do not fit neatly into "allowed" or "prohibited" categories. In these cases, TSA officers are trained to use their professional judgment — and that means outcomes can vary between airports, checkpoints, and individual screeners.

A few common grey-area situations:

Allen key / hex key sets: Individually these are small, blunt-ended tools. Loose in a bag they rarely cause issues. Packed in a roll with many pieces, a screener might pause to inspect them. They are not on any prohibited list, but be prepared to explain what they are.

Knitting needles and crochet hooks: These are officially allowed, but screeners occasionally flag them. If challenged, remain calm and ask the screener to consult TSA guidelines — the rules favor you here.

Soldering irons: Not explicitly listed as prohibited, but the sharp tip and potential for modification to heat-based danger means screeners treat them inconsistently. Checking them is strongly recommended.

Magnetic tool sets: Generally fine, but strong magnets can sometimes interfere with screening equipment and prompt additional inspection. Be patient.

Compressed air canisters (for cleaning electronics): Small cans are typically permitted; large industrial canisters are not. Check the size against the TSA 3-1-1 rules for liquids and aerosols.

When in doubt, the TSA's "What Can I Bring?" search tool at TSA.gov is the most reliable resource. If an item is not listed and you are unsure, call TSA's helpline (1-866-289-9673) or ask at the checkpoint before your bags are scanned.

How to Pack Tools for Air Travel: Pro Tips

Following the rules is step one. Packing smart is step two. Here is how experienced travelers and contractors minimize delays at security.

Keep tools in a dedicated, transparent pouch. When screeners can see items clearly on the X-ray, they spend less time examining them. A clear or mesh tool roll is ideal. Loose tools scattered through a bag create shadows on the X-ray that are harder to interpret.

Measure before you pack. If you are not 100% certain a screwdriver or wrench is under 7 inches, measure it with a ruler. An item that is 7.1 inches is prohibited. Don't guess.

Remove tools from pockets before approaching the checkpoint. A pocket knife or multi-tool forgotten in a pants pocket will almost certainly trigger an alarm. Check every pocket — jacket, trousers, and bag exterior — before you queue.

Pack prohibited tools in checked luggage — but do it safely. Knives and other sharp tools in checked bags must be sheathed or wrapped securely so they cannot cut through the bag or injure handlers. A blade sleeve or wrapping in thick cloth is recommended. You are also required to declare certain items at check-in.

Photograph your bag's contents before flying. If items are confiscated, a photo gives you a record for insurance purposes or reimbursement claims.

Arrive early if traveling with tools. Even permitted items can trigger extra screening if they appear unusual on an X-ray. Budget an extra 15 minutes if you know your bag contains tools.

Check lithium battery rules separately. If any of your tools are battery-powered, lithium batteries have their own complex set of regulations — watt-hours, quantity limits, carry-on versus checked. These rules are separate from the tool rules and must be checked independently.

What to Do If Your Tool Gets Confiscated

It happens to even experienced travelers. Here is what you should know if a screener pulls your item.

You have options at the checkpoint — but they are time-sensitive. If you are not in a rush, you can ask to have your bag re-screened with the item removed (to confirm nothing else is flagged), then take the item back to the airline check-in counter to be added to a checked bag — for a fee. This only works if you have enough time before your flight.

You can surrender the item. Confiscated items typically go into a bin and are either disposed of or, in some cases, auctioned by the state. You will not get it back.

You can ask a companion to take it out of the airport. If someone is seeing you off, they can take the item back to a car or home. If you are alone, some airports have mail-back services near security — though these are not universal.

You cannot argue your way through. Even if you believe the screener is wrong about an item being prohibited, attempting to argue or bypass screening is a federal offense. If you genuinely believe a confiscation was made in error, you can file a complaint with the TSA after the fact through TSA.gov.

Filing a claim for a wrongful confiscation is possible through the TSA claims process, but success rates are low and the process is slow. The best protection is knowing the rules in advance.

International Flights and Non-US Security Rules

The rules outlined in this guide apply specifically to TSA-governed checkpoints in the United States. If you are flying internationally — either departing from a foreign airport or transiting through one — the rules may differ significantly.

Most international airports follow ICAO (International Civil Aviation Organization) guidelines, which are broadly similar to TSA rules but with some differences. For example:

• The UK and EU ban all sharp objects in carry-on bags, including scissors of any blade length in many airports — stricter than US rules.
• Canada (CATSA) follows rules similar to the TSA but has its own prohibited items list. Scissors must have blades shorter than 6 cm (~2.4 inches).
• Australia (ASA) prohibits all scissors with blades longer than 6 cm in carry-on bags.
• Some Southeast Asian airports apply highly discretionary screening, with individual screeners having wide latitude to confiscate anything they deem risky.

The golden rule for international travel: when in doubt, check it. Tools that pass through a US checkpoint without issue may be confiscated at a connecting airport overseas. For multi-leg international itineraries, the most restrictive rules on your route should govern your packing decisions.

Final Thoughts: A Little Preparation Goes a Long Way

The most common reason travelers lose tools at security is not deliberate rule-breaking — it is simply not knowing the rules exist. TSA rules for tools in carry-on bags are specific, publicly available, and largely predictable once you read them. A screwdriver under 7 inches? Fine. A pocket knife of any size? Not fine. A multi-tool without a blade? Fine. One with a blade? Checked bag only.

Before your next flight, run a quick mental check: Are any tools in my carry-on longer than 7 inches? Do any of them have a blade of any length? If you answer yes to either, restructure your packing before you get to the checkpoint — not at it.

The TSA's "What Can I Bring?" tool at TSA.gov is free, fast, and comprehensive. Bookmark it. Two minutes of research before you pack is worth more than a confiscated multi-tool and a missed flight.

Frequently Asked Questions