ISO 3438:2003 lays down the dimensions of subland twist drills with Morse taper shanks for holes prior to tapping screw threads. The drills have been designed to produce holes prior to tapping metric threads (coarse pitch series) over a selected range of M8 to M30. ISO 3438:2003 complements ISO 2306.
ISO 3438:2003 lays down the dimensions of subland twist drills with Morse taper shanks for holes prior to tapping screw threads. The drills have been designed to produce holes prior to tapping metric threads (coarse pitch series) over a selected range of M8 to M30. ISO 3438:2003 complements ISO 2306.
La présente norme fixe les dimensions des forets destinés à produire simultanément l'avant-trou de taraudage et le trou de passage des boulons (suivant NF E 27-040 - Série moyenne). Les forets étagés à queue cône Morse sont prévus pour avant-trous de taraudage pour filetages métriques M 8 à M 30. Les forets étagés à queue cylindrique font l'objet de la norme NF E 66-077. Ils sont prévus pour avant-trous de taraudage pour filetages métriques M 3 à M 14.
<p>ISO 3438:2013 specifies the dimensions of subland twist drills with Morse taper shanks and cylindrical shanks for holes prior to tapping screw threads.</p> <p>The drills are designed to produce holes prior to tapping metric threads (coarse pitch series) over a selected range of:</p> <ul> <li>M8 to M30 for subland twist drills with Morse taper shanks;</li> <li>M3 to M14 for subland twist drills with cylindrical shanks.</li> </ul> <p>ISO 3438:2013 complements ISO 2306.</p>
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