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All Containers›Shop by use case›Model parts and paint›The cylinder›A go/no-go gaugeShop all model parts and paint →
The cylinder

A go/no-go gauge

By Dwight Davis, Founder

On this page11
No measurement, no judgment. It fits or it does not.

The test, in full

"Place the article, without compressing it, into the cylinder. If the article fits entirely within the cylinder, in any orientation, it fails to comply with the test procedure."

Three conditions in one sentence

Without compressing it, entirely within, and in any orientation. Each of those closes a way of arguing that something passed.

Without compressing it

A soft part cannot be squeezed to fit, and equally cannot be squeezed to fail. The article is tested as it is.

In any orientation

Which is the one people forget. A long thin part that will not fit upright may fit diagonally, and diagonally counts.

Entirely within

Not mostly. A part resting with a corner proud of the rim has not fitted entirely, and a part that disappears inside has.

Then it is abused and tested again

The article goes through the use and abuse testing at 16 CFR 1500.51 and 1500.52, and anything that comes off is dropped into the cylinder on its own.

With a short exclusion list

Paper, fabric, yarn, fuzz, elastic and string are excluded from that second round. Everything else that liberates gets tested.

Which is why a kit is harder than a part

A model kit is an assembly designed to come apart. Every piece that can separate is its own test article.

This property does not quote the dimensions

The cylinder is specified by Figure 1 of the section rather than in the text, so there is no sentence to quote. The test is the quotable part and it is the useful part.

And the gauge is a real object you can own

Which is the practical point for a modeller with small children: the test is physical, repeatable and needs no expertise. Drop the part in and look.

References

16 CFR 1501.4, test method: "Place the article, without compressing it, into the cylinder. If the article fits entirely within the cylinder, in any orientation, it fails to comply with the test procedure." Articles are then subjected to the use and abuse testing at 16 CFR 1500.51 and 1500.52, and any liberated component other than paper, fabric, yarn, fuzz, elastic and string is tested in the cylinder individually. The cylinder's dimensions are given in Figure 1 of the section rather than in its text. law.cornell.edu
Written from 16 CFR 1501.4 and 16 CFR 1262, and from the catalog as it stood on 19 October 2026. No cylinder dimensions appear anywhere in this property, because the rule gives them in a figure rather than in its text. Whether a particular part or magnet passes either test is a determination about that article; we sell the container it is kept in. Whether a kit is a children's product is the four-factor test covered in the resin jewelry property.