NF E25-803

Square bolts (bolts + nuts) - Product grade C - Symbol Q

Le présent document spécifie les dimensions et les caractéristiques des boulons à tête carrée, à filetage métrique ISO, de diamètre nominal M5 à M30 inclus, constitués de vis à tête carrée de grade C (partiellement filetées à tige normale ou à tige réduite, ou entièrement filetées) , et d'écrous hexagonaux normaux (style 1) de grades A et B, ou d'écrous carrés larges (de hauteur nominale " 0,8 d) de grade C. Ces boulons sont principalement utilisés dans le bâtiment. Les vis à tête carré de grades A et B font l'objet des normes NF E 25-116 et NF E 25-117. Les écrous carrés (surplat normal) de grade C font l'objet de la norme NF E 25-404.

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