Tuercas hexagonales para soldeo con brida (ISO 21670:2003)
Hexagon weld nuts with flange (ISO 21670:2003)
Ecrous hexagonaux à souder, à embase (ISO 21670:2003)
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See part of the content of the standard
21.060.20 / Nuts
CTN 17 - Fasteners
EN ISO 21670:2003 (Identical)
ISO 21670:2003 (Identical)
It is cancelled by: UNE-EN ISO 21670:2015