TSA has clear size-based rules for tools. Most hand tools under 7 inches are allowed in carry-on, while larger tools and bladed instruments must go in checked baggage.
26 items in this category with TSA carry-on and checked bag rules.
Tools shorter than 7 inches are allowed in carry-on bags, which covers most screwdrivers, wrenches, pliers, and hex keys. Anything longer, plus hammers, crowbars, saws, drill bits, and power tools, must be packed in checked baggage regardless of intended use.
How tools are screened at the checkpoint
Measure the whole tool — The 7-inch limit is total length including the handle, not just the shaft or blade. Measure before you pack rather than guessing at the belt.
Group small tools together — A pouch or roll keeps the X-ray image readable. Loose metal scattered through a bag is the most common reason for a manual search.
Remove lithium batteries from power tools — The tool body goes in checked baggage; the lithium battery must come with you in the cabin with its terminals protected.
Pack sharp accessories separately — Drill bits, saw blades, and utility knife blades are prohibited in carry-on even when short. Wrap them and put them in a checked bag.
Expect officer discretion on borderline items — A tool near the limit, or one that could be used as a club, can still be refused. Check it if losing it would matter.