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The design-type, material and any finish is usually expressed in plain language (often English).
Clarified ISO standards for (metric) fasteners are rapidly gaining international recognition in preference to the similar DIN, on which SI was originally based. The letters and digits in a rivet's identification number that precede its dash numbers indicate the specification under which the rivet was manufactured and the head style.
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Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. On installation, the rivet is placed in a punched or drilled hole, and the tail is upset, or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place.
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This facilitates the use of a simple drill-gauge to check both rivet and drill are compatible.