Nails are one of the most used objects in human history and they have always been used in various applications. It is assumed that the first nails were already used by Homo sapiens while, one of their wooden versions, concerned the carpentry works even in the Bronze Age. During the nails evolution were manufactured by hand, subsequently forged and sometimes melted, obtained from iron sheets, providing a square section, up to their mass production in 1700 in the United States. At the end of the nineteenth century they were replaced by circular-section nails produced by machines that worked a metal wire. 
Today the UNI EN 10230-1: 2002 standard establishes the requirements regarding the preferential shape and dimensions, the dimensional tolerances and the coating of steel wire nails, supplied loose, for general uses.
Depending on the type of application, different nails are used in carpentry: for wood, for metal, for cement made of iron or steel whose use is aimed at various sectors (construction, agriculture, industrial, artisanal and zootechnical).
The regulatory requirements include a product made from a wire obtained by wire drawing produced in compliance with EN 10016, parts 1 to 4, whose structure is characterized by: the head - the stem - the end.
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Common nails in steel for carpentry available in various diameters and lengths, compliant with the UNI EN 10230-1: 2002 standard (also called carpenter's nails or nails for wood) made
1) head: flat plateau
2) stem: straight
3) tip: diamond
4) produced with steel wire drawn at medium carbon content (about 0.5-0.75%) and subsequently subjected to heat treatment to increase its hardness (HRC), therefore they are harder than iron nails. This type is usually used for fixing wooden planks on concrete, brick or reinforced concrete blocks and artifacts.
Iron nails for concrete (black or galvanized), available in various lengths (also called wall nails). The suffix "iron" is not entirely correct, but is used in common language to differentiate them from others; since they are made of softer material. Iron nails are in fact produced with low-carbon glossy drawn steel wire (about 0.05-0.10%). This steel can also be bent over 90 ° and this guarantees more safety for the user. These types of nails are usually used for fixing wooden boards to one another or to concrete.
For more information:  Not all nails are the same