Allen Wrench Set
Allen wrenches (hex keys) 7 inches or shorter are allowed in carry-on; any longer arm in the set must be checked.
Carry-on
Allowed with conditions
Checked
Allowed
Carry-on details
Allowed with conditions. TSA's 7-inch tool rule covers hex keys just like screwdrivers and wrenches. Most individual Allen wrenches, especially folding sets and small L-keys, are well under 7 inches and are allowed in carry-on. A long-arm hex key or a large T-handle driver can exceed the limit, so check the longest piece in your set.
Checked-bag details
Allowed. A full Allen wrench set of any size — folding, L-keys, T-handles, or a ball-end set — can be packed in checked baggage without restriction.
Quantity limit
7 count (per item)
Special instructions
Measure the longest individual key in the set, not the folding case. A compact folding hex key set is the safest bet for carry-on since each arm is short even when the set overall looks larger.
FAQ
- Can I bring a folding Allen key set in carry-on?
- Yes, as long as each individual hex arm is 7 inches or shorter, which is true of nearly all standard and folding hex key sets.
- Will a bike multi-tool with hex keys be allowed in carry-on?
- Yes, if it has no knife blade and every tool arm, including any hex keys, is 7 inches or shorter when extended.
Related items
Source: TSA — What Can I Bring? · Last verified: 2026-08-01
Final decision rests with the security officer at the checkpoint.