NF EN 20273
Fasteners. Clearance hole for bolts and screws.
Specifies diameters for general purpose applications; tabulates the hole diameters for fine, medium and coarse series for thread diameters from 1 mm up to 150 mm; holes for special applications should be selected on the basis of design requirements.
Specifies diameters for general purpose applications; tabulates the hole diameters for fine, medium and coarse series for thread diameters from 1 mm up to 150 mm; holes for special applications should be selected on the basis of design requirements.
Il est apparu intéressant à la commission de normalisation "Boulonnerie" de regrouper en un seul fascicule de documentation les dimensions des usinages à réaliser dans les pièces d'un assemblage pour y loger soit le corps, soit la tête des vis ou les écrous.
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