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A lot is one heat of steel

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There is a federal act about fasteners The definition of a lot Three conditions, and the third is the interesting one So a lot is defined by material provenance Which is further upstream than people expect And it makes the container part of the definition No tool, no modification, no intent The difference is what is lost So a small parts jar can destroy a lot Then the second definition, which has a floor And the third, which excludes the brand Three definitions and three findings And our own position, which is a blank References

"from the same coil or heat number of metal."

There is a federal act about fasteners

With its own definitions section, and three of those definitions are directly about what a container can do.

The definition of a lot

A quantity of fasteners of one part number fabricated by the same production process from the same coil or heat number of metal as provided by the metal manufacturer.

Three conditions, and the third is the interesting one

One part number. One production process. And the same coil or heat number of metal.

So a lot is defined by material provenance

Not by a production run and not by a date. By which batch of steel it came from, as provided by the metal manufacturer.

Which is further upstream than people expect

The definition reaches past the fastener maker to the mill, and names the mill as the source of the heat number.

And it makes the container part of the definition

Tip two heat numbers into one jar and what is in the jar is no longer a lot. The fasteners are unchanged.

No tool, no modification, no intent

Which is the finding, and it is the same shape as the travel medication property: an act that requires nothing and changes a legal status.

The difference is what is lost

There a label stayed behind on a bottle. Here a traceability chain is broken by combining two things that were each fine.

So a small parts jar can destroy a lot

Which is worth knowing on a shelf of 210 jars, and it is not a container quality problem at all.

Then the second definition, which has a floor

A fastener has a nominal diameter of 6 millimetres or greater, or a quarter inch or greater. Below that an article is not a fastener for this Act.

And the third, which excludes the brand

A grade identification marking does not include a manufacturer's insignia or part number. The grade mark is the mark.

Three definitions and three findings

A lot broken by mixing, a floor below which the Act does not reach, and a mark that is not the brand.

And our own position, which is a blank

We publish ten specification fields and not one of them is a lot number, heat number, coil reference or production date.

References

15 U.S.C. 5402(10) defines a lot as "a quantity of fasteners of one part number fabricated by the same production process from the same coil or heat number of metal as provided by the metal manufacturer". law.cornell.edu

15 U.S.C. 5402(6) defines a fastener as "a metallic screw, nut, bolt, or stud having internal or external threads, with a nominal diameter of 6 millimeters or greater, in the case of such items described in metric terms, or 1/4 inch or greater, in the case of such items described in terms of the English system of measurement, or a load-indicating washer, that is through-hardened or represented as meeting a consensus standard that calls for through-hardening, and that is grade identification marked or represented as meeting a consensus standard that requires grade identification marking". These are definitions from the Fastener Quality Act; nothing on these pages describes what the Act requires of anyone or determines whether any article falls within the definition. law.cornell.edu

15 U.S.C. 5402(8) defines a grade identification marking as "any grade-mark or property class symbol appearing on a fastener purporting to indicate that the lot of fasteners conforms to a specific consensus standard, but such term does not include a manufacturer's insignia or part number". law.cornell.edu

Written from 15 U.S.C. 5402 and from the catalog as it stood on 19 October 2026. These are definitions from the Fastener Quality Act and nothing here describes what the Act requires of anyone, the inspection or certification scheme, the exemptions, or which consensus standards are involved. Nothing determines whether any article is a fastener within the definition or whether any quantity is a lot. We publish no lot number, heat number, coil reference or production date anywhere in our data. This shelf is shared identically by nine groups and the sewing notions property enumerates the inventory.