A federal cylinder test still defines a toy's choking risk

The play

Long before a toy reaches a shelf, U.S. regulators run it through a specific physical test: does it fit inside a hollow cylinder sized to approximate a young child's throat? That test is defined in 16 CFR part 1501, a federal regulation the Consumer Product Safety Commission administers under the Federal Hazardous Substances Act. It is a living regulation with no single event date; this entry describes it as it reads in the eCFR and in CPSC's own business guidance, both retrieved 16 September 2026.

What the evidence says

The regulation's own text states that a toy or article intended for use by children under three years of age is a banned hazardous substance if it, or a piece that detaches during normal or reasonably foreseeable use, is too small, meaning it fits entirely within the commission's test cylinder in any orientation, without being compressed. Before that cylinder test, an article is first subjected to use-and-abuse testing under a related rule, excluding bite tests, so a piece that breaks or detaches under that stress is tested too, not only parts visible on the intact toy. CPSC's business guidance restates the same standard more plainly, describing the cylinder as built to approximate a child under three's fully expanded throat size and noting that a product failing the test is a banned hazardous substance requiring a Children's Product Certificate that cites the regulation by name.

Age fit and safety

Both documents scope the rule to children under three, not toddlers specifically or children generally; the regulation itself lists exempted categories, including certain books, phonograph records, and some art materials, that need not pass the cylinder test even though that age group may use them. A toy that passes the cylinder test is not certified safe for every child younger than three in every circumstance; the rule tests one hazard, whether a piece is too small, not choking risk from other product features, and it says nothing about an older sibling's toy reaching a younger child.

What to look for

This is editorial guidance drawn from the regulation's own scope. A package's age label reflects this and other standards together, so checking a toy for loose, breakable, or detachable pieces before handing it to a child under three remains a caregiver's own judgment call, not something the test performs at home. A toy labeled for children three and older signals its maker did not test it against the under-three limit, which matters most where children of different ages share toys.

• Does a toy have small, detachable, or breakable pieces that a younger sibling in the home could reach?
• Is a toy's stated age range based on this choking-hazard test, a different standard, or a developmental judgment?
• Would a caregiver know to physically check a toy's pieces against a rough two-finger width before handing it to a toddler?

The cylinder test is narrow by design, built around a specific throat-size approximation rather than a general judgment about a toy, and reading its stated scope is what keeps a passed test from being mistaken for a broader safety guarantee.