Tornillo de cabeza hexagonal con valona. Serie gruesa.
Hexagon bolts with flange - Heavy series
Vis à tête hexagonale à embase cylindro-tronconique - Série large
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21.060.10 / Bolts, screws, studs
CTN 17 - Fasteners
EN 1665:1997 (Identical)
Corrected by: UNE-EN 1665/AC: 1998
Corrected by: UNE-EN 1665:1998/AC: 2007