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https://www.dtnut.com/products/iso-4032-4034-4036-hex-nuts-class-8-10-12/

The ISO standard specifies type 1 hexagon nuts with thread specifications M1.6~,64 (including M64) and product grades A and B. Grade A is used for thread d≤M16; Grade B is used for nuts with thread d>M16.

ISO (International Organization for Standardization) is a worldwide federation of national standards organizations (ISO member groups). The work of preparing International Standards is normally carried out through ISO technical committees. Each member groups interested in a project undertaken by a technical committee may also participate in that committee. ISO-related governmental or non-governmental international organizations may also participate in this work. ISO and IEC (International Electrotechnical Commission) have close ties in electrotechnical standardization.

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